[Bug c++/116745] New: ICE on NTTP defaulted to generic lambda with template parameter list containing type parameter with type constraint

[eczbek.void at gmail dot com via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=116745

Bug ID: 116745
   Summary: ICE on NTTP defaulted to generic lambda with template
parameter list containing type parameter with type
constraint
   Product: gcc
   Version: 15.0
Status: UNCONFIRMED
  Severity: normal
  Priority: P3
 Component: c++
  Assignee: unassigned at gcc dot gnu.org
  Reporter: eczbek.void at gmail dot com
  Target Milestone: ---

This causes an ICE



```
template
concept A = true;

template {}>
int x;

int main() {}
```



Using built-in specs.
COLLECT_GCC=/opt/compiler-explorer/gcc-snapshot/bin/g++
Target: x86_64-linux-gnu
Configured with: ../gcc-trunk-20240916/configure
--prefix=/opt/compiler-explorer/gcc-build/staging
--enable-libstdcxx-backtrace=yes --build=x86_64-linux-gnu
--host=x86_64-linux-gnu --target=x86_64-linux-gnu --disable-bootstrap
--enable-multiarch --with-abi=m64 --with-multilib-list=m32,m64,mx32
--enable-multilib --enable-clocale=gnu
--enable-languages=c,c++,fortran,ada,objc,obj-c++,go,d,rust,m2 --enable-ld=yes
--enable-gold=yes --enable-libstdcxx-debug --enable-libstdcxx-time=yes
--enable-linker-build-id --enable-lto --enable-plugins --enable-threads=posix
--with-pkgversion=Compiler-Explorer-Build-gcc-4f2cd256aace732bff511c59f5871456a564a3a5-binutils-2.42
Thread model: posix
Supported LTO compression algorithms: zlib
gcc version 15.0.0 20240916 (experimental)
(Compiler-Explorer-Build-gcc-4f2cd256aace732bff511c59f5871456a564a3a5-binutils-2.42)
 
COLLECT_GCC_OPTIONS='-fdiagnostics-color=always' '-g' '-o' '/app/output.s'
'-masm=intel' '-fno-verbose-asm' '-S' '-std=c++20' '-freport-bug' '-v'
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/opt/compiler-explorer/gcc-trunk-20240916/bin/../libexec/gcc/x86_64-linux-gnu/15.0.0/cc1plus
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GNU C++20
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version 15.0.0 20240916 (experimental) (x86_64-linux-gnu)
compiled by GNU C version 11.4.0, GMP version 6.2.1, MPFR version
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GGC heuristics: --param ggc-min-expand=30 --param ggc-min-heapsize=4096
ignoring nonexistent directory
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ignoring duplicate directory
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ignoring duplicate directory
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ignoring duplicate directory
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ignoring duplicate directory
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ignoring nonexistent directory "/usr/local/include/x86_64-linux-gnu"
ignoring duplicate directory
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#include "..." search starts here:
#include <...> search starts here:

/opt/compiler-explorer/gcc-trunk-20240916/bin/../lib/gcc/x86_64-linux-gnu/15.0.0/../../../../include/c++/15.0.0

/opt/compiler-explorer/gcc-trunk-20240916/bin/../lib/gcc/x86_64-linux-gnu/15.0.0/../../../../include/c++/15.0.0/x86_64-linux-gnu

/opt/compiler-explorer/gcc-trunk-20240916/bin/../lib/gcc/x86_64-linux-gnu/15.0.0/../../../../include/c++/15.0.0/backward

/opt/compiler-explorer/gcc-trunk-20240916/bin/../lib/gcc/x86_64-linux-gnu/15.0.0/include

/opt/compiler-explorer/gcc-trunk-20240916/bin/../lib/gcc/x86_64-linux-gnu/15.0.0/include-fixed/x86_64-linux-gnu

/opt/compiler-explorer/gcc-trunk-20240916/bin/../lib/gcc/x86_64-linux-gnu/15.0.0/include-fixed
 /usr/local/include
 /opt/compiler-explorer/gcc-trunk-20240916/bin/../lib/gcc/../../include
 /usr/include/x86_64-linux-gnu
 /usr/include
End of search list.
Compiler executable checksum: 1c07a43389f7c31206f9595b0ff65e47
:4:20: internal compiler error: in
cp_parser_placeholder_type_specifier, at cp/parser.cc:20982
4 | template {}>
  |  

[Bug c++/115865] New: Internal compiler error when ill-formed conversion from std::initializer_list is attempted

[eczbek.void at gmail dot com via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=115865

Bug ID: 115865
   Summary: Internal compiler error when ill-formed conversion
from std::initializer_list is attempted
   Product: gcc
   Version: 15.0
Status: UNCONFIRMED
  Severity: normal
  Priority: P3
 Component: c++
  Assignee: unassigned at gcc dot gnu.org
  Reporter: eczbek.void at gmail dot com
  Target Milestone: ---

This causes an ICE when compiled with -fsanitize=address



#include 

int main() {
auto x = { 1, 2, 3 };
int y = x;
}



Using built-in specs.
COLLECT_GCC=/opt/compiler-explorer/gcc-snapshot/bin/g++
Target: x86_64-linux-gnu
Configured with: ../gcc-trunk-20240710/configure
--prefix=/opt/compiler-explorer/gcc-build/staging
--enable-libstdcxx-backtrace=yes --build=x86_64-linux-gnu
--host=x86_64-linux-gnu --target=x86_64-linux-gnu --disable-bootstrap
--enable-multiarch --with-abi=m64 --with-multilib-list=m32,m64,mx32
--enable-multilib --enable-clocale=gnu
--enable-languages=c,c++,fortran,ada,objc,obj-c++,go,d,rust,m2 --enable-ld=yes
--enable-gold=yes --enable-libstdcxx-debug --enable-libstdcxx-time=yes
--enable-linker-build-id --enable-lto --enable-plugins --enable-threads=posix
--with-pkgversion=Compiler-Explorer-Build-gcc-0dcfef42df473c60a2343a66d289f7844edaff1e-binutils-2.42
Thread model: posix
Supported LTO compression algorithms: zlib
gcc version 15.0.0 20240710 (experimental)
(Compiler-Explorer-Build-gcc-0dcfef42df473c60a2343a66d289f7844edaff1e-binutils-2.42)
 
COLLECT_GCC_OPTIONS='-fdiagnostics-color=always' '-g' '-o' '/app/output.s'
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'-march=x86-64' '-dumpdir' '/app/'

/opt/compiler-explorer/gcc-trunk-20240710/bin/../libexec/gcc/x86_64-linux-gnu/15.0.0/cc1plus
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GNU C++17
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version 15.0.0 20240710 (experimental) (x86_64-linux-gnu)
compiled by GNU C version 11.4.0, GMP version 6.2.1, MPFR version
4.1.0, MPC version 1.2.1, isl version isl-0.24-GMP

GGC heuristics: --param ggc-min-expand=30 --param ggc-min-heapsize=4096
ignoring nonexistent directory
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ignoring duplicate directory
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ignoring duplicate directory
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ignoring duplicate directory
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ignoring duplicate directory
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#include "..." search starts here:
#include <...> search starts here:

/opt/compiler-explorer/gcc-trunk-20240710/bin/../lib/gcc/x86_64-linux-gnu/15.0.0/../../../../include/c++/15.0.0

/opt/compiler-explorer/gcc-trunk-20240710/bin/../lib/gcc/x86_64-linux-gnu/15.0.0/../../../../include/c++/15.0.0/x86_64-linux-gnu

/opt/compiler-explorer/gcc-trunk-20240710/bin/../lib/gcc/x86_64-linux-gnu/15.0.0/../../../../include/c++/15.0.0/backward

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/opt/compiler-explorer/gcc-trunk-20240710/bin/../lib/gcc/x86_64-linux-gnu/15.0.0/include-fixed
 /usr/local/include
 /opt/compiler-explorer/gcc-trunk-20240710/bin/../lib/gcc/../../include
 /usr/include/x86_64-linux-gnu
 /usr/include
End of search list.
Compiler executable checksum: 178af327ff79473fdfbab5491fa6cee9
: In function 'int main()':
:5:17: error: cannot convert 'std::initializer_list' to 'int' in
initialization
5 | int y = x;
  | ^
  | |
 

[Bug c++/117034] ICE on abbreviated function template with type constraint containing a lambda argument

[eczbek.void at gmail dot com via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=117034

--- Comment #2 from eczbek.void at gmail dot com ---
Is this error related?

```
template
concept A = true;

template T>
void foo(T) {}
```

Compiler Explorer link: https://godbolt.org/z/dfKaW8dxa

[Bug c++/117034] ICE on abbreviated function template with type constraint containing a lambda argument

[eczbek.void at gmail dot com via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=117034

--- Comment #4 from eczbek.void at gmail dot com ---
Whoops.

[Bug c++/117034] New: ICE on abbreviated function template with type constraint containing a lambda argument

[eczbek.void at gmail dot com via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=117034

Bug ID: 117034
   Summary: ICE on abbreviated function template with type
constraint containing a lambda argument
   Product: gcc
   Version: 15.0
Status: UNCONFIRMED
  Severity: normal
  Priority: P3
 Component: c++
  Assignee: unassigned at gcc dot gnu.org
  Reporter: eczbek.void at gmail dot com
  Target Milestone: ---

This causes an ICE:



```
template
concept A = true;

void f(A<[] {}> auto) {}
```



Using built-in specs.
COLLECT_GCC=/opt/compiler-explorer/gcc-snapshot/bin/g++
Target: x86_64-linux-gnu
Configured with: ../gcc-trunk-20241008/configure
--prefix=/opt/compiler-explorer/gcc-build/staging
--enable-libstdcxx-backtrace=yes --build=x86_64-linux-gnu
--host=x86_64-linux-gnu --target=x86_64-linux-gnu --disable-bootstrap
--enable-multiarch --with-abi=m64 --with-multilib-list=m32,m64,mx32
--enable-multilib --enable-clocale=gnu
--enable-languages=c,c++,fortran,ada,objc,obj-c++,go,d,rust,m2 --enable-ld=yes
--enable-gold=yes --enable-libstdcxx-debug --enable-libstdcxx-time=yes
--enable-linker-build-id --enable-lto --enable-plugins --enable-threads=posix
--with-pkgversion=Compiler-Explorer-Build-gcc-14870c1f8636feaa45eac1133ce5b9228225d8bd-binutils-2.42
Thread model: posix
Supported LTO compression algorithms: zlib
gcc version 15.0.0 20241008 (experimental)
(Compiler-Explorer-Build-gcc-14870c1f8636feaa45eac1133ce5b9228225d8bd-binutils-2.42)
 
COLLECT_GCC_OPTIONS='-fdiagnostics-color=always' '-g' '-o' '/app/output.s'
'-masm=intel' '-fno-verbose-asm' '-S' '-std=c++20' '-v' '-freport-bug'
'-shared-libgcc' '-mtune=generic' '-march=x86-64' '-dumpdir' '/app/'

/opt/compiler-explorer/gcc-trunk-20241008/bin/../libexec/gcc/x86_64-linux-gnu/15.0.0/cc1plus
-quiet -v -imultiarch x86_64-linux-gnu -iprefix
/opt/compiler-explorer/gcc-trunk-20241008/bin/../lib/gcc/x86_64-linux-gnu/15.0.0/
-D_GNU_SOURCE  -quiet -dumpdir /app/ -dumpbase output.cpp -dumpbase-ext
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GNU C++20
(Compiler-Explorer-Build-gcc-14870c1f8636feaa45eac1133ce5b9228225d8bd-binutils-2.42)
version 15.0.0 20241008 (experimental) (x86_64-linux-gnu)
compiled by GNU C version 11.4.0, GMP version 6.2.1, MPFR version
4.1.0, MPC version 1.2.1, isl version isl-0.24-GMP

GGC heuristics: --param ggc-min-expand=30 --param ggc-min-heapsize=4096
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#include "..." search starts here:
#include <...> search starts here:

/opt/compiler-explorer/gcc-trunk-20241008/bin/../lib/gcc/x86_64-linux-gnu/15.0.0/../../../../include/c++/15.0.0

/opt/compiler-explorer/gcc-trunk-20241008/bin/../lib/gcc/x86_64-linux-gnu/15.0.0/../../../../include/c++/15.0.0/x86_64-linux-gnu

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/opt/compiler-explorer/gcc-trunk-20241008/bin/../lib/gcc/x86_64-linux-gnu/15.0.0/include-fixed/x86_64-linux-gnu

/opt/compiler-explorer/gcc-trunk-20241008/bin/../lib/gcc/x86_64-linux-gnu/15.0.0/include-fixed
 /usr/local/include
 /opt/compiler-explorer/gcc-trunk-20241008/bin/../lib/gcc/../../include
 /usr/include/x86_64-linux-gnu
 /usr/include
End of search list.
Compiler executable checksum: c4cd079a64c67fd9dafa323917805b15
:4:10: internal compiler error: in tsubst_expr, at cp/pt.cc:21978
4 | void f(A<[] {}> auto) {}
  |  ^
0x283dbf5 diagnostic_context::diagnostic_impl(rich_location*,
diagnostic_

[Bug c++/117054] New: ICE on variable template initialized to generic lambda containing constexpr-if containing instantiation of template with a NTTP defaulted to a lambda

[eczbek.void at gmail dot com via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=117054

Bug ID: 117054
   Summary: ICE on variable template initialized to generic lambda
containing constexpr-if containing instantiation of
template with a NTTP defaulted to a lambda
   Product: gcc
   Version: 15.0
Status: UNCONFIRMED
  Severity: normal
  Priority: P3
 Component: c++
  Assignee: unassigned at gcc dot gnu.org
  Reporter: eczbek.void at gmail dot com
  Target Milestone: ---

This causes an ICE: https://godbolt.org/z/Ybv4qcsGb


```
template
constexpr bool a = true;

template
auto foo = [](auto) {
if constexpr (a<>) {}
};

int main() {
foo;
}
```


Using built-in specs.
COLLECT_GCC=/opt/compiler-explorer/gcc-snapshot/bin/g++
Target: x86_64-linux-gnu
Configured with: ../gcc-trunk-20241009/configure
--prefix=/opt/compiler-explorer/gcc-build/staging
--enable-libstdcxx-backtrace=yes --build=x86_64-linux-gnu
--host=x86_64-linux-gnu --target=x86_64-linux-gnu --disable-bootstrap
--enable-multiarch --with-abi=m64 --with-multilib-list=m32,m64,mx32
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--enable-languages=c,c++,fortran,ada,objc,obj-c++,go,d,rust,m2 --enable-ld=yes
--enable-gold=yes --enable-libstdcxx-debug --enable-libstdcxx-time=yes
--enable-linker-build-id --enable-lto --enable-plugins --enable-threads=posix
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Thread model: posix
Supported LTO compression algorithms: zlib
gcc version 15.0.0 20241009 (experimental)
(Compiler-Explorer-Build-gcc-41179a3276807c6bb6d30f9bafb6b9da31320e48-binutils-2.42)
 
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/opt/compiler-explorer/gcc-trunk-20241009/bin/../libexec/gcc/x86_64-linux-gnu/15.0.0/cc1plus
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GNU C++20
(Compiler-Explorer-Build-gcc-41179a3276807c6bb6d30f9bafb6b9da31320e48-binutils-2.42)
version 15.0.0 20241009 (experimental) (x86_64-linux-gnu)
compiled by GNU C version 11.4.0, GMP version 6.2.1, MPFR version
4.1.0, MPC version 1.2.1, isl version isl-0.24-GMP

GGC heuristics: --param ggc-min-expand=30 --param ggc-min-heapsize=4096
ignoring nonexistent directory
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: In in

[Bug c++/117061] New: Error on use of parameter in lambda outside function body

[eczbek.void at gmail dot com via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=117061

Bug ID: 117061
   Summary: Error on use of parameter in lambda outside function
body
   Product: gcc
   Version: 15.0
Status: UNCONFIRMED
  Severity: normal
  Priority: P3
 Component: c++
  Assignee: unassigned at gcc dot gnu.org
  Reporter: eczbek.void at gmail dot com
  Target Milestone: ---

This code causes an error: https://godbolt.org/z/3EdfzMqr9


```
void foo(int x) noexcept(noexcept([&x] { x; })) {}

int main() {
foo(3);
}
```


: In lambda function:
:1:43: error: use of parameter outside function body before ';' token
1 | void foo(int x) noexcept(noexcept([&x] { x; })) {}
  |   ^
Compiler returned: 1

[Bug c++/117061] Error on use of parameter in lambda outside function body

[eczbek.void at gmail dot com via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=117061

--- Comment #2 from eczbek.void at gmail dot com ---
Clang errors on a similar-looking piece of code:

```
void foo(auto x) noexcept(noexcept([x] { x; })) {}
```

[Bug c++/116960] New: ICE: Error reporting routines re-entered

[eczbek.void at gmail dot com via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=116960

Bug ID: 116960
   Summary: ICE: Error reporting routines re-entered
   Product: gcc
   Version: 15.0
Status: UNCONFIRMED
  Severity: normal
  Priority: P3
 Component: c++
  Assignee: unassigned at gcc dot gnu.org
  Reporter: eczbek.void at gmail dot com
  Target Milestone: ---

This causes an ICE, but should just error:



```
template
using Foo = decltype([](auto) { return 0; }(0));

template
Foo<[] {}> foo() {
[]() {
return Foo<[] {}>();
};
}

int main() {
foo();
}
```



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internal compiler error: error reporting routines re-entered.
0x283ad0f diagnostic_context::report_diagnost

[Bug c++/117400] New: ICE on invalid requires clause of generic lambda in function template

[eczbek.void at gmail dot com via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=117400

Bug ID: 117400
   Summary: ICE on invalid requires clause of generic lambda in
function template
   Product: gcc
   Version: 15.0
Status: UNCONFIRMED
  Severity: normal
  Priority: P3
 Component: c++
  Assignee: unassigned at gcc dot gnu.org
  Reporter: eczbek.void at gmail dot com
  Target Milestone: ---

https://godbolt.org/z/3MG6fMaa7


```
template
void f(){
[](auto) requires {} {}; // nonsense
}

int main() {
f();
}
```


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: In function 'void f()':
:3:27: error: missing additional 'requires' to start a
requires-expression [-Wtemplate-body]
3 | [](auto) requires {} {};

[Bug c++/117422] New: Error: template parameter was not declared in this scope

[eczbek.void at gmail dot com via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=117422

Bug ID: 117422
   Summary: Error: template parameter was not declared in this
scope
   Product: gcc
   Version: 15.0
Status: UNCONFIRMED
  Severity: normal
  Priority: P3
 Component: c++
  Assignee: unassigned at gcc dot gnu.org
  Reporter: eczbek.void at gmail dot com
  Target Milestone: ---

https://godbolt.org/z/rz5eGzqf6



```
template
void f();

struct S {
template
friend void f() {
T x;
}
};

int main() {
f();
}
```



: In function 'void f()':
:7:17: error: 'T' was not declared in this scope [-Wtemplate-body]
7 | T x;
  | ^
Compiler returned: 1

[Bug c++/117422] Error: template parameter was not declared in this scope

[eczbek.void at gmail dot com via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=117422

--- Comment #4 from eczbek.void at gmail dot com ---
Wow, very strange. Thanks for the workaround.

[Bug c++/117336] New: ICE on lambda in requires expression

[eczbek.void at gmail dot com via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=117336

Bug ID: 117336
   Summary: ICE on lambda in requires expression
   Product: gcc
   Version: 15.0
Status: UNCONFIRMED
  Severity: normal
  Priority: P3
 Component: c++
  Assignee: unassigned at gcc dot gnu.org
  Reporter: eczbek.void at gmail dot com
  Target Milestone: ---

https://godbolt.org/z/hKfjYGo4j


```
int main() {
requires { [] {}; };
}
```


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: In function 'int main()':
:2:27: internal compiler error: in cp_parser_expression_statement, at
cp/parser.cc:13250
2 | requires { [] {}; };
  |   ^
0x287e175 diagnostic_context::diagnostic_impl(rich_location*,
diagnostic_m

[Bug c++/117518] New: ICE: too many template parameter lists in declaration of lambda

[eczbek.void at gmail dot com via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=117518

Bug ID: 117518
   Summary: ICE: too many template parameter lists in declaration
of lambda
   Product: gcc
   Version: 15.0
Status: UNCONFIRMED
  Severity: normal
  Priority: P3
 Component: c++
  Assignee: unassigned at gcc dot gnu.org
  Reporter: eczbek.void at gmail dot com
  Target Milestone: ---

https://godbolt.org/z/9aTezcaof


```
template(auto...) {}>
int x;

int main() {}
```


Using built-in specs.
COLLECT_GCC=/opt/compiler-explorer/gcc-snapshot/bin/g++
Target: x86_64-linux-gnu
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(Compiler-Explorer-Build-gcc-440be01b07941506d1c8819448bd17c8717d55f5-binutils-2.42)
 
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GNU C++23
(Compiler-Explorer-Build-gcc-440be01b07941506d1c8819448bd17c8717d55f5-binutils-2.42)
version 15.0.0 20241107 (experimental) (x86_64-linux-gnu)
compiled by GNU C version 11.4.0, GMP version 6.2.1, MPFR version
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GGC heuristics: --param ggc-min-expand=30 --param ggc-min-heapsize=4096
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ignoring duplicate directory
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#include "..." search starts here:
#include <...> search starts here:

/opt/compiler-explorer/gcc-trunk-20241109/bin/../lib/gcc/x86_64-linux-gnu/15.0.0/../../../../include/c++/15.0.0

/opt/compiler-explorer/gcc-trunk-20241109/bin/../lib/gcc/x86_64-linux-gnu/15.0.0/../../../../include/c++/15.0.0/x86_64-linux-gnu

/opt/compiler-explorer/gcc-trunk-20241109/bin/../lib/gcc/x86_64-linux-gnu/15.0.0/../../../../include/c++/15.0.0/backward

/opt/compiler-explorer/gcc-trunk-20241109/bin/../lib/gcc/x86_64-linux-gnu/15.0.0/include

/opt/compiler-explorer/gcc-trunk-20241109/bin/../lib/gcc/x86_64-linux-gnu/15.0.0/include-fixed/x86_64-linux-gnu

/opt/compiler-explorer/gcc-trunk-20241109/bin/../lib/gcc/x86_64-linux-gnu/15.0.0/include-fixed
 /usr/local/include
 /opt/compiler-explorer/gcc-trunk-20241109/bin/../lib/gcc/../../include
 /usr/include/x86_64-linux-gnu
 /usr/include
End of search list.
Compiler executable checksum: 48aec1cd6e5905ea1ea38b6985c86e72
:1:40: error: too many template parameter lists in declaration of
''
1 | template(auto...) {}>
  |^
:1:43: internal compiler error: in poplevel_class, at
cp/name-lookup.

[Bug c++/117515] Error: passing lambda expression to constructor in requires expression is invalid

[eczbek.void at gmail dot com via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=117515

--- Comment #3 from eczbek.void at gmail dot com ---
(In reply to Jan Schultke from comment #1)
> this is particularly weird because
> 
> > bool b = requires { int([] {}); };
> 
> ... is accepted, so static_assert is in some way related.

Testing that with my `A` struct again, `b` is false when it should be true:
https://godbolt.org/z/nvxhjYP71

[Bug c++/116928] New: Error on NTTP with '>' in braced default

[eczbek.void at gmail dot com via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=116928

Bug ID: 116928
   Summary: Error on NTTP with '>' in braced default
   Product: gcc
   Version: 15.0
Status: UNCONFIRMED
  Severity: normal
  Priority: P3
 Component: c++
  Assignee: unassigned at gcc dot gnu.org
  Reporter: eczbek.void at gmail dot com
  Target Milestone: ---

This causes an error:



```
template 0 }>
int x;
```



:1:20: error: expected '}' before '>' token
1 | template 0 }>
  |~   ^
:1:20: note: probably missing a comma or an operator before
Compiler returned: 1



Compiler Explorer link: 

This code compiles fine with Clang and MSVC

[Bug c++/116952] New: Error on lambda NTTP argument to type constraint in template parameter list of generic lambda

[eczbek.void at gmail dot com via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=116952

Bug ID: 116952
   Summary: Error on lambda NTTP argument to type constraint in
template parameter list of generic lambda
   Product: gcc
   Version: 15.0
Status: UNCONFIRMED
  Severity: normal
  Priority: P3
 Component: c++
  Assignee: unassigned at gcc dot gnu.org
  Reporter: eczbek.void at gmail dot com
  Target Milestone: ---

This causes an error:



```
template
concept A = true;

auto b = []> {};
```



:4:15: error: lambda-expression in template parameter type
4 | auto b = []> {};
  |   ^
:4:13: error: template argument 2 is invalid
4 | auto b = []> {};
  | ^~~
Compiler returned: 1



Compiler Explorer link: https://godbolt.org/z/WWG35bsdG

This code compiles fine with Clang and MSVC

[Bug c++/117515] New: Error: calling constructor with lambda expression in requires expression is invalid

[eczbek.void at gmail dot com via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=117515

Bug ID: 117515
   Summary: Error: calling constructor with lambda expression in
requires expression is invalid
   Product: gcc
   Version: 15.0
Status: UNCONFIRMED
  Severity: normal
  Priority: P3
 Component: c++
  Assignee: unassigned at gcc dot gnu.org
  Reporter: eczbek.void at gmail dot com
  Target Milestone: ---

https://godbolt.org/z/xPG5a4nb1


```
struct A {
A(auto) {}
};

static_assert(requires { A([] {}); });

int main() {}
```


:5:15: error: static assertion failed
5 | static_assert(requires { A([] {}); });
  |   ^~
:5:15: note: constraints not satisfied
:5:26: note: the required expression '(A)()' is
invalid
5 | static_assert(requires { A([] {}); });
  |  ^~~~
cc1plus: note: set '-fconcepts-diagnostics-depth=' to at least 2 for more
detail
Compiler returned: 1

[Bug c++/117937] ICE: in expand_expr_real_1

[eczbek.void at gmail dot com via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=117937

--- Comment #5 from eczbek.void at gmail dot com ---
Sorry, I forgot that I was testing in Compiler Explorer. Please ignore.

[Bug c++/115792] throw() should be diagnostic/errored out with C++20+ (and deprecated warning for C++17)

[eczbek.void at gmail dot com via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=115792

eczbek.void at gmail dot com changed:

   What|Removed |Added

 CC||eczbek.void at gmail dot com

--- Comment #12 from eczbek.void at gmail dot com ---
GCC recommends using `throw()` even though it's deprecated/removed:
https://godbolt.org/z/v6q11zood


> struct A {
>   void* operator new(decltype(sizeof(0))) {
>   return nullptr;
>   }
> };

warning: 'operator new' must not return NULL unless it is declared 'throw()'
(or '-fcheck-new' is in effect)

[Bug c++/117937] New: ICE: in expand_expr_real_1

[eczbek.void at gmail dot com via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=117937

Bug ID: 117937
   Summary: ICE: in expand_expr_real_1
   Product: gcc
   Version: 15.0
Status: UNCONFIRMED
  Severity: normal
  Priority: P3
 Component: c++
  Assignee: unassigned at gcc dot gnu.org
  Reporter: eczbek.void at gmail dot com
  Target Milestone: ---

https://godbolt.org/z/6PnevabK5


```
using size_t = decltype(sizeof(0));

template
struct seq {};

void g(auto...) {}

void f(auto... args) {
[&](seq) {
g(args...[i]...);
}(seq<0>());
}

int main() {
f(0);
}
```


Using built-in specs.
COLLECT_GCC=/opt/compiler-explorer/gcc-snapshot/bin/g++
Target: x86_64-linux-gnu
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--enable-libstdcxx-backtrace=yes --build=x86_64-linux-gnu
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Thread model: posix
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gcc version 15.0.0 20241206 (experimental)
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'-masm=intel' '-fno-verbose-asm' '-S' '-std=c++26' '-v' '-freport-bug'
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GNU C++26
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ignoring duplicate directory
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ignoring duplicate directory
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#include "..." search starts here:
#include <...> search starts here:

/opt/compiler-explorer/gcc-trunk-20241206/bin/../lib/gcc/x86_64-linux-gnu/15.0.0/../../../../include/c++/15.0.0

/opt/compiler-explorer/gcc-trunk-20241206/bin/../lib/gcc/x86_64-linux-gnu/15.0.0/../../../../include/c++/15.0.0/x86_64-linux-gnu

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/opt/compiler-explorer/gcc-trunk-20241206/bin/../lib/gcc/x86_64-linux-gnu/15.0.0/include

/opt/compiler-explorer/gcc-trunk-20241206/bin/../lib/gcc/x86_64-linux-gnu/15.0.0/include-fixed/x86_64-linux-gnu

/opt/compiler-explorer/gcc-trunk-20241206/bin/../lib/gcc/x86_64-linux-gnu/15.0.0/include-fixed
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 /usr/include/x86_64-linux-gnu
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End of search list.
Compiler executable checksum: 4e34e632885ed4b1698a1314efd63063
during RTL pass: expand
: In lambda function:
:10:18: internal compiler error: in expand_expr_real_1, at
ex

[Bug c++/117937] ICE: in expand_expr_real_1

[eczbek.void at gmail dot com via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=117937

--- Comment #4 from eczbek.void at gmail dot com ---
(In reply to Marek Polacek from comment #2)
> This one was fixed yesterday: bug 117898.

My GCC version is 15.0.0 20241206 and running `git log` in the directory I
built GCC from shows the latest commit to be
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=117898#c2
Does this mean anything?

[Bug c++/117937] ICE: in expand_expr_real_1

[eczbek.void at gmail dot com via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=117937

--- Comment #1 from eczbek.void at gmail dot com ---
Another ICE if `f()` is called without arguments:
https://godbolt.org/z/aba3M7h9W


internal compiler error: tree check: accessed elt 1 of 'tree_vec' with 0 elts
in make_pack_index

[Bug c++/118391] New: ICE: in add_extra_args, at cp/pt.cc:13737

[eczbek.void at gmail dot com via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=118391

Bug ID: 118391
   Summary: ICE: in add_extra_args, at cp/pt.cc:13737
   Product: gcc
   Version: 15.0
Status: UNCONFIRMED
  Severity: normal
  Priority: P3
 Component: c++
  Assignee: unassigned at gcc dot gnu.org
  Reporter: eczbek.void at gmail dot com
  Target Milestone: ---

https://godbolt.org/z/TovxM83E6
This seems to work with GCC 14.2


```
template
using A = int;

template
using B = decltype([] {}.template operator()());

template
using C = A>;

C x;

int main() {}
```



: In substitution of 'template using C = A.operator()())> [with T = int]':
:10:6:   required from here
   10 | C x;
  |  ^
:5:20: internal compiler error: in add_extra_args, at cp/pt.cc:13737
5 | using B = decltype([] {}.template operator()());
  |^~~
0x28fe3b5 diagnostic_context::diagnostic_impl(rich_location*,
diagnostic_metadata const*, diagnostic_option_id, char const*, __va_list_tag
(*) [1], diagnostic_t)
???:0
0x29151b6 internal_error(char const*, ...)
???:0
0xacb842 fancy_abort(char const*, int, char const*)
???:0
0xd17f0d tsubst_lambda_expr(tree_node*, tree_node*, int, tree_node*)
???:0
0xd26557 tsubst(tree_node*, tree_node*, int, tree_node*)
???:0
0xd31fa4 tsubst_template_args(tree_node*, tree_node*, int, tree_node*)
???:0
0xd2616a tsubst(tree_node*, tree_node*, int, tree_node*)
???:0
0xd3a533 instantiate_template(tree_node*, tree_node*, int)
???:0
0xd23fca lookup_template_class(tree_node*, tree_node*, tree_node*, tree_node*,
int)
???:0
0xd6525c finish_template_type(tree_node*, tree_node*, int)
???:0
0xce5eba c_parse_file()
???:0
0xe45879 c_common_parse_file()
???:0
Please submit a full bug report, with preprocessed source (by using
-freport-bug).
Please include the complete backtrace with any bug report.
See  for instructions.
Compiler returned: 1

[Bug c++/117061] Error on use of parameter in lambda outside function body

[eczbek.void at gmail dot com via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=117061

--- Comment #3 from eczbek.void at gmail dot com ---
Another test case: https://godbolt.org/z/98joW6saj

```
auto f = [x = 0] noexcept(noexcept(x)) { return x; };
```

:1:36: error: 'x' was not declared in this scope
1 | auto f = [x = 0] noexcept(noexcept(x)) { return x; };
  |^
Compiler returned: 1

[Bug c++/118619] New: ICE on lambda with explicit this parameter in concept

[eczbek.void at gmail dot com via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=118619

Bug ID: 118619
   Summary: ICE on lambda with explicit this parameter in concept
   Product: gcc
   Version: 15.0
Status: UNCONFIRMED
  Severity: normal
  Priority: P3
 Component: c++
  Assignee: unassigned at gcc dot gnu.org
  Reporter: eczbek.void at gmail dot com
  Target Milestone: ---

https://godbolt.org/z/8cd3T96bo

```
template
concept A = ([](this auto){}, true);

int main() {
A;
}
```


Using built-in specs.
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#include <...> search starts here:

/opt/compiler-explorer/gcc-trunk-20250122/bin/../lib/gcc/x86_64-linux-gnu/15.0.1/../../../../include/c++/15.0.1

/opt/compiler-explorer/gcc-trunk-20250122/bin/../lib/gcc/x86_64-linux-gnu/15.0.1/../../../../include/c++/15.0.1/x86_64-linux-gnu

/opt/compiler-explorer/gcc-trunk-20250122/bin/../lib/gcc/x86_64-linux-gnu/15.0.1/../../../../include/c++/15.0.1/backward

/opt/compiler-explorer/gcc-trunk-20250122/bin/../lib/gcc/x86_64-linux-gnu/15.0.1/include

/opt/compiler-explorer/gcc-trunk-20250122/bin/../lib/gcc/x86_64-linux-gnu/15.0.1/include-fixed/x86_64-linux-gnu

/opt/compiler-explorer/gcc-trunk-20250122/bin/../lib/gcc/x86_64-linux-gnu/15.0.1/include-fixed
 /usr/local/include
 /opt/compiler-explorer/gcc-trunk-20250122/bin/../lib/gcc/../../include
 /usr/include/x86_64-linux-gnu
 /usr/include
End of search list.
Compiler executable checksum: 63148c74934259136bad0eaadd7ee052
: In member function 'constexpr::operator decltype
((static_cast())) (*)(auto:1)()
const':
:2:14: internal compiler error: in satisfy_declaration_constraints, at
cp/constraint.cc:2645
2 | concept A = ([](this auto){

[Bug c++/118620] New: ICE: Segmentation fault

[eczbek.void at gmail dot com via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=118620

Bug ID: 118620
   Summary: ICE: Segmentation fault
   Product: gcc
   Version: 15.0
Status: UNCONFIRMED
  Severity: normal
  Priority: P3
 Component: c++
  Assignee: unassigned at gcc dot gnu.org
  Reporter: eczbek.void at gmail dot com
  Target Milestone: ---

https://godbolt.org/z/ssa4eW58W

```
template
concept A = ([](this auto) {
if constexpr (y);
}, true);

int main() {
A;
}
```


Using built-in specs.
COLLECT_GCC=/opt/compiler-explorer/gcc-snapshot/bin/g++
Target: x86_64-linux-gnu
Configured with: ../gcc-trunk-20250122/configure
--prefix=/opt/compiler-explorer/gcc-build/staging
--enable-libstdcxx-backtrace=yes --build=x86_64-linux-gnu
--host=x86_64-linux-gnu --target=x86_64-linux-gnu --disable-bootstrap
--enable-multiarch --with-abi=m64 --with-multilib-list=m32,m64,mx32
--enable-multilib --enable-clocale=gnu
--enable-languages=c,c++,fortran,ada,objc,obj-c++,go,d,rust,m2 --enable-ld=yes
--enable-gold=yes --enable-libstdcxx-debug --enable-libstdcxx-time=yes
--enable-linker-build-id --enable-lto --enable-plugins --enable-threads=posix
--with-pkgversion=Compiler-Explorer-Build-gcc-e9bd9d427a9b1c080426b0b16d3704673cbf-binutils-2.42
Thread model: posix
Supported LTO compression algorithms: zlib
gcc version 15.0.1 20250122 (experimental)
(Compiler-Explorer-Build-gcc-e9bd9d427a9b1c080426b0b16d3704673cbf-binutils-2.42)
 
COLLECT_GCC_OPTIONS='-fdiagnostics-color=always' '-g' '-o' '/app/output.s'
'-masm=intel' '-fno-verbose-asm' '-S' '-std=c++23' '-v' '-freport-bug'
'-shared-libgcc' '-mtune=generic' '-march=x86-64' '-dumpdir' '/app/'

/opt/compiler-explorer/gcc-trunk-20250122/bin/../libexec/gcc/x86_64-linux-gnu/15.0.1/cc1plus
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ignoring duplicate directory
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#include "..." search starts here:
#include <...> search starts here:

/opt/compiler-explorer/gcc-trunk-20250122/bin/../lib/gcc/x86_64-linux-gnu/15.0.1/../../../../include/c++/15.0.1

/opt/compiler-explorer/gcc-trunk-20250122/bin/../lib/gcc/x86_64-linux-gnu/15.0.1/../../../../include/c++/15.0.1/x86_64-linux-gnu

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/opt/compiler-explorer/gcc-trunk-20250122/bin/../lib/gcc/x86_64-linux-gnu/15.0.1/include-fixed
 /usr/local/include
 /opt/compiler-explorer/gcc-trunk-20250122/bin/../lib/gcc/../../include
 /usr/include/x86_64-linux-gnu
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End of search list.
Compiler executable checksum: 63148c74934259136bad0eaadd7ee052
: In lambda function:
:3:9: internal compiler error: Segmentation fault
3 | if constexpr (y);
  | ^~
0x2908045 diagnostic_context::diagnostic_impl(rich_location*,
diagnostic_metadata const*, diagno

[Bug c++/118526] New: infinite compile time

[eczbek.void at gmail dot com via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=118526

Bug ID: 118526
   Summary: infinite compile time
   Product: gcc
   Version: 15.0
Status: UNCONFIRMED
  Severity: normal
  Priority: P3
 Component: c++
  Assignee: unassigned at gcc dot gnu.org
  Reporter: eczbek.void at gmail dot com
  Target Milestone: ---

Created attachment 60189
  --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=60189&action=edit
Preprocessed template nonsense

I'm writing some template nonsense and GCC seems to take forever to compile it.
Please find the preprocessed code attached



g++ (GCC) 15.0.1 20250116 (experimental)

compiling with -std=c++26

[Bug c++/117061] Error on use of parameter in lambda outside function body

[eczbek.void at gmail dot com via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=117061

--- Comment #4 from eczbek.void at gmail dot com ---
Constructors too :(

```
template
struct S {
S(int x) requires(requires { [x] { x; }; }) {}
};
```


```
: In lambda function:
:3:41: error: use of parameter outside function body before ';' token
[-Wtemplate-body]
3 | S(int x) requires(requires { [x] { x; }; }) {}
  | ^
```

[Bug c++/119175] New: ICE segfault on lambda in requires clause of generic lambda in requires clause

[eczbek.void at gmail dot com via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=119175

Bug ID: 119175
   Summary: ICE segfault on lambda in requires clause of generic
lambda in requires clause
   Product: gcc
   Version: 15.0
Status: UNCONFIRMED
  Severity: normal
  Priority: P3
 Component: c++
  Assignee: unassigned at gcc dot gnu.org
  Reporter: eczbek.void at gmail dot com
  Target Milestone: ---

https://godbolt.org/z/5ar46j7hs

```
template
void from() requires requires {
[] requires requires {
[] {};
} {};
} {}

int main() {
from();
}
```


```
Using built-in specs.
COLLECT_GCC=/opt/compiler-explorer/gcc-snapshot/bin/g++
Target: x86_64-linux-gnu
Configured with: ../gcc-trunk-20250309/configure
--prefix=/opt/compiler-explorer/gcc-build/staging
--enable-libstdcxx-backtrace=yes --build=x86_64-linux-gnu
--host=x86_64-linux-gnu --target=x86_64-linux-gnu --disable-bootstrap
--enable-multiarch --with-abi=m64 --with-multilib-list=m32,m64,mx32
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--enable-languages=c,c++,fortran,ada,objc,obj-c++,go,d,rust,m2 --enable-ld=yes
--enable-gold=yes --enable-libstdcxx-debug --enable-libstdcxx-time=yes
--enable-linker-build-id --enable-lto --enable-plugins --enable-threads=posix
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Thread model: posix
Supported LTO compression algorithms: zlib
gcc version 15.0.1 20250309 (experimental)
(Compiler-Explorer-Build-gcc-e270b8997854d56e8e8536fd1126de7541e3d826-binutils-2.42)
 
COLLECT_GCC_OPTIONS='-fdiagnostics-color=always' '-g' '-o' '/app/output.s'
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'-isystem' '/opt/compiler-explorer/libs/xieite/main/include' '-shared-libgcc'
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/opt/compiler-explorer/gcc-trunk-20250309/bin/../libexec/gcc/x86_64-linux-gnu/15.0.1/cc1plus
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GGC heuristics: --param ggc-min-expand=30 --param ggc-min-heapsize=4096
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"/opt/compiler-explorer/gcc-trunk-20250309/bin/../lib/gcc/x86_64-linux-gnu/15.0.1/../../../../x86_64-linux-gnu/include"
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ignoring duplicate directory
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ignoring duplicate directory
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ignoring duplicate directory
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#include "..." search starts here:
#include <...> search starts here:
 /opt/compiler-explorer/libs/xieite/main/include

/opt/compiler-explorer/gcc-trunk-20250309/bin/../lib/gcc/x86_64-linux-gnu/15.0.1/../../../../include/c++/15.0.1

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 /usr/local/include
 /opt/compiler-explorer/gcc-trunk-20250309/bin/../lib/gcc/../../include
 /usr/include/x86_64-linux-gnu
 /usr/include
End of search

[Bug c++/119134] New: ICE segfault on capturing lambda in fold expression in requires clause

[eczbek.void at gmail dot com via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=119134

Bug ID: 119134
   Summary: ICE segfault on capturing lambda in fold expression in
requires clause
   Product: gcc
   Version: 15.0
Status: UNCONFIRMED
  Severity: normal
  Priority: P3
 Component: c++
  Assignee: unassigned at gcc dot gnu.org
  Reporter: eczbek.void at gmail dot com
  Target Milestone: ---

https://godbolt.org/z/GKh88Y78x


```
void f(auto... args) requires([args] {}, ..., true) {}
```


```
Using built-in specs.
COLLECT_GCC=/opt/compiler-explorer/gcc-snapshot/bin/g++
Target: x86_64-linux-gnu
Configured with: ../gcc-trunk-20250306/configure
--prefix=/opt/compiler-explorer/gcc-build/staging
--enable-libstdcxx-backtrace=yes --build=x86_64-linux-gnu
--host=x86_64-linux-gnu --target=x86_64-linux-gnu --disable-bootstrap
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#include "..." search starts here:
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End of search list.
Compiler executable checksum: 6102868dbb63b04fbfc58a9ecb45219d
:1:36: internal compiler error: Segmentation fault
1 | void f(auto... args) requires([args] {}, ..., true) {}
  |^
0x291a005 diagnostic_context::diagno

[Bug c++/119134] ICE segfault on capturing lambda in fold expression in requires clause

[eczbek.void at gmail dot com via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=119134

--- Comment #1 from eczbek.void at gmail dot com ---
I might've forgotten an extra set of parentheses around the fold expression, so
here's an updated link: https://godbolt.org/z/P9bq4GhcP

```
void f(auto... args) requires(([args] {}, ..., true)) {}
```

[Bug c++/119048] New: ICE Segfault on lambda with variadic parameters and static specifier

[eczbek.void at gmail dot com via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=119048

Bug ID: 119048
   Summary: ICE Segfault on lambda with variadic parameters and
static specifier
   Product: gcc
   Version: 15.0
Status: UNCONFIRMED
  Severity: normal
  Priority: P3
 Component: c++
  Assignee: unassigned at gcc dot gnu.org
  Reporter: eczbek.void at gmail dot com
  Target Milestone: ---

https://godbolt.org/z/zG79a99aM


```
int main() {
[] {}, [](...) static {};
}
```


```
Using built-in specs.
COLLECT_GCC=/opt/compiler-explorer/gcc-snapshot/bin/g++
Target: x86_64-linux-gnu
Configured with: ../gcc-trunk-20250227/configure
--prefix=/opt/compiler-explorer/gcc-build/staging
--enable-libstdcxx-backtrace=yes --build=x86_64-linux-gnu
--host=x86_64-linux-gnu --target=x86_64-linux-gnu --disable-bootstrap
--enable-multiarch --with-abi=m64 --with-multilib-list=m32,m64,mx32
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--enable-languages=c,c++,fortran,ada,objc,obj-c++,go,d,rust,m2 --enable-ld=yes
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Thread model: posix
Supported LTO compression algorithms: zlib
gcc version 15.0.1 20250227 (experimental)
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COLLECT_GCC_OPTIONS='-fdiagnostics-color=always' '-g' '-o' '/app/output.s'
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ignoring duplicate directory
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#include "..." search starts here:
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/opt/compiler-explorer/gcc-trunk-20250227/bin/../lib/gcc/x86_64-linux-gnu/15.0.1/../../../../include/c++/15.0.1

/opt/compiler-explorer/gcc-trunk-20250227/bin/../lib/gcc/x86_64-linux-gnu/15.0.1/../../../../include/c++/15.0.1/x86_64-linux-gnu

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 /opt/compiler-explorer/gcc-trunk-20250227/bin/../lib/gcc/../../include
 /usr/include/x86_64-linux-gnu
 /usr/include
End of search list.
Compiler executable checksum: 004a5673f06345ec3199b1585ce83ebb
: In function 'int main()':
:2:24: internal compiler error: Segmentation fault
2 | [] {}, [](...) static {};
  |^~
0x29175b5 diagnostic_context::diagnostic_impl(rich_location*,
diagnostic

[Bug c++/119129] New: ICE: in keep_template_parm, at cp/pt.cc:11115

[eczbek.void at gmail dot com via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=119129

Bug ID: 119129
   Summary: ICE: in keep_template_parm, at cp/pt.cc:5
   Product: gcc
   Version: 15.0
Status: UNCONFIRMED
  Severity: normal
  Priority: P3
 Component: c++
  Assignee: unassigned at gcc dot gnu.org
  Reporter: eczbek.void at gmail dot com
  Target Milestone: ---

https://godbolt.org/z/3W514r5MP


```
template using A = decltype([] {});

template requires(A(), true) int x;

int main() { x; }
```


```
Using built-in specs.
COLLECT_GCC=/opt/compiler-explorer/gcc-snapshot/bin/g++
Target: x86_64-linux-gnu
Configured with: ../gcc-trunk-20250305/configure
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--enable-libstdcxx-backtrace=yes --build=x86_64-linux-gnu
--host=x86_64-linux-gnu --target=x86_64-linux-gnu --disable-bootstrap
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gcc version 15.0.1 20250305 (experimental)
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'-shared-libgcc' '-mtune=generic' '-march=x86-64' '-dumpdir' '/app/'

/opt/compiler-explorer/gcc-trunk-20250305/bin/../libexec/gcc/x86_64-linux-gnu/15.0.1/cc1plus
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GGC heuristics: --param ggc-min-expand=30 --param ggc-min-heapsize=4096
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#include "..." search starts here:
#include <...> search starts here:

/opt/compiler-explorer/gcc-trunk-20250305/bin/../lib/gcc/x86_64-linux-gnu/15.0.1/../../../../include/c++/15.0.1

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 /usr/include/x86_64-linux-gnu
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End of search list.
Compiler executable checksum: 55b3176e04fb4d95492bc1dfefc3dcd6
:5:14: internal compiler error: in keep_template_parm, at
cp/pt.cc:5
5 | int main() { x; }
  |  ^~
0x291a065 diagnostic_context::diagnostic_impl(rich_location*,
diagnostic_met

[Bug c++/119129] [14/15 Regression] ICE: in keep_template_parm, at cp/pt.cc:11115

[eczbek.void at gmail dot com via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=119129

--- Comment #2 from eczbek.void at gmail dot com ---
Is the ice-on-invalid-code tag correct? The code looks valid to me and it seems
to compile on Clang.

[Bug c++/119328] New: ICE on generic lambda with defaulted parameter in requires clause

[eczbek.void at gmail dot com via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=119328

Bug ID: 119328
   Summary: ICE on generic lambda with defaulted parameter in
requires clause
   Product: gcc
   Version: 15.0
Status: UNCONFIRMED
  Severity: normal
  Priority: P3
 Component: c++
  Assignee: unassigned at gcc dot gnu.org
  Reporter: eczbek.void at gmail dot com
  Target Milestone: ---

https://godbolt.org/z/jn16q96jv

```cpp
int x = 0;

int main() {
[](auto x) requires requires { [](int = x) {}(); } {}(0);
}
```

```
Using built-in specs.
COLLECT_GCC=/opt/compiler-explorer/gcc-snapshot/bin/g++
Target: x86_64-linux-gnu
Configured with: ../gcc-trunk-20250317/configure
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gcc version 15.0.1 20250317 (experimental)
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#include "..." search starts here:
#include <...> search starts here:

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End of search list.
Compiler executable checksum: 7eb22631251594d4e511620990a18033
: In substitution of 'template main()::
[with auto:1 = int]':
:4:64:   required from here
4 | [](auto x) requires requires { [](int = x) {}(); 

[Bug c++/119316] New: new expression incorrectly required to have constant expression size

[eczbek.void at gmail dot com via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=119316

Bug ID: 119316
   Summary: new expression incorrectly required to have constant
expression size
   Product: gcc
   Version: 15.0
Status: UNCONFIRMED
  Severity: normal
  Priority: P3
 Component: c++
  Assignee: unassigned at gcc dot gnu.org
  Reporter: eczbek.void at gmail dot com
  Target Milestone: ---

https://godbolt.org/z/YTK4PYrqE


```cpp
template
void foo(unsigned n) requires(requires { new T[n]; }) {}

int main() { foo(5); }
```


```
: In instantiation of 'void foo(unsigned int) requires requires{new T(
foo::n);} [with T = int]':
:2:48: error: size of array is not an integral constant-expression
2 | void foo(unsigned n) requires(requires { new T[n]; }) {}
  |^
```

[Bug c++/119347] New: ICE: in tsubst, at cp/pt.cc:16632

[eczbek.void at gmail dot com via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=119347

Bug ID: 119347
   Summary: ICE: in tsubst, at cp/pt.cc:16632
   Product: gcc
   Version: 15.0
Status: UNCONFIRMED
  Severity: normal
  Priority: P3
 Component: c++
  Assignee: unassigned at gcc dot gnu.org
  Reporter: eczbek.void at gmail dot com
  Target Milestone: ---

https://godbolt.org/z/s5j99Taf5

```cpp
template
struct type_list {
using slice = decltype([] {}, 0);

template
using xform = type_list;
};

using T = type_list::xform<0>;

int main() {}
```

```
Using built-in specs.
COLLECT_GCC=/opt/compiler-explorer/gcc-snapshot/bin/g++
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Compiler executable checksum: 7eb22631251594d4e511620990a18033
: In substitution of 'template template > using
type_list<  >::xform = type_list,
0))> [with int  = 0;  = int]':
:9:34:   require

[Bug c++/119345] New: ICE segfault on capturing lambda in fold expression in capturing lambda

[eczbek.void at gmail dot com via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=119345

Bug ID: 119345
   Summary: ICE segfault on capturing lambda in fold expression in
capturing lambda
   Product: gcc
   Version: 15.0
Status: UNCONFIRMED
  Severity: normal
  Priority: P3
 Component: c++
  Assignee: unassigned at gcc dot gnu.org
  Reporter: eczbek.void at gmail dot com
  Target Milestone: ---

https://godbolt.org/z/8hdnY3Wdb

```cpp
void f(auto... args) {
[args...] {
(..., [args...] { i; });
}.template operator()<0>();
}

int main() {
f();
}
```

```
Using built-in specs.
COLLECT_GCC=/opt/compiler-explorer/gcc-snapshot/bin/g++
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gcc version 15.0.1 20250317 (experimental)
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version 15.0.1 20250317 (experimental) (x86_64-linux-gnu)
compiled by GNU C version 11.4.0, GMP version 6.2.1, MPFR version
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/opt/compiler-explorer/gcc-trunk-20250317/bin/../lib/gcc/x86_64-linux-gnu/15.0.1/../../../../include/c++/15.0.1

/opt/compiler-explorer/gcc-trunk-20250317/bin/../lib/gcc/x86_64-linux-gnu/15.0.1/../../../../include/c++/15.0.1/x86_64-linux-gnu

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End of search list.
Compiler executable checksum: 7eb22631251594d4e511620990a18033
: In instantiation of 'f<>():: [with int ...i = {0}]':
:4:26:   required from 'void f(auto:

[Bug c++/119346] New: ICE: in tsubst_pack_expansion, at cp/pt.cc:13899

[eczbek.void at gmail dot com via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=119346

Bug ID: 119346
   Summary: ICE: in tsubst_pack_expansion, at cp/pt.cc:13899
   Product: gcc
   Version: 15.0
Status: UNCONFIRMED
  Severity: normal
  Priority: P3
 Component: c++
  Assignee: unassigned at gcc dot gnu.org
  Reporter: eczbek.void at gmail dot com
  Target Milestone: ---

https://godbolt.org/z/hdTaKb7Mv

```cpp
int main() {
[] {
return (..., [] { x; });
}();
}
```

```
Using built-in specs.
COLLECT_GCC=/opt/compiler-explorer/gcc-snapshot/bin/g++
Target: x86_64-linux-gnu
Configured with: ../gcc-trunk-20250317/configure
--prefix=/opt/compiler-explorer/gcc-build/staging
--enable-libstdcxx-backtrace=yes --build=x86_64-linux-gnu
--host=x86_64-linux-gnu --target=x86_64-linux-gnu --disable-bootstrap
--enable-multiarch --with-abi=m64 --with-multilib-list=m32,m64,mx32
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--enable-libstdcxx-time=yes --enable-linker-build-id --enable-lto
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--with-pkgversion=Compiler-Explorer-Build-gcc-a3ead22b42de8ddeeb869df2fa9cbdae7af5204d-binutils-2.42
Thread model: posix
Supported LTO compression algorithms: zlib
gcc version 15.0.1 20250317 (experimental)
(Compiler-Explorer-Build-gcc-a3ead22b42de8ddeeb869df2fa9cbdae7af5204d-binutils-2.42)
 
COLLECT_GCC_OPTIONS='-fdiagnostics-color=always' '-g' '-o' '/app/output.s'
'-masm=intel' '-fno-verbose-asm' '-S' '-std=c++20' '-v' '-freport-bug'
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GNU C++20
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version 15.0.1 20250317 (experimental) (x86_64-linux-gnu)
compiled by GNU C version 11.4.0, GMP version 6.2.1, MPFR version
4.1.0, MPC version 1.2.1, isl version isl-0.24-GMP

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End of search list.
Compiler executable checksum: 7eb22631251594d4e511620990a18033
: In instantiation of 'main():: [with int  = 0]':
:4:3:   required from here
2 | [] {
  | ~
3 | return (..., [] { x; });
  | ~~

[Bug c++/119503] Error on decltype of lambda expression in variadic NTTP

[eczbek.void at gmail dot com via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=119503

eczbek.void at gmail dot com changed:

   What|Removed |Added

 Resolution|--- |INVALID
 Status|UNCONFIRMED |RESOLVED

--- Comment #1 from eczbek.void at gmail dot com ---
Nevermind, this is IFNDR
https://eel.is/c++draft/temp.res.general#6.5

[Bug c++/119503] New: Error on decltype of lambda expression in variadic NTTP

[eczbek.void at gmail dot com via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=119503

Bug ID: 119503
   Summary: Error on decltype of lambda expression in variadic
NTTP
   Product: gcc
   Version: 15.0
Status: UNCONFIRMED
  Severity: normal
  Priority: P3
 Component: c++
  Assignee: unassigned at gcc dot gnu.org
  Reporter: eczbek.void at gmail dot com
  Target Milestone: ---

https://godbolt.org/z/MfEqT64an

```cpp
template int x;

int main() {}
```

```
:1:19: error: lambda-expression in template parameter type
1 | template int x;
  |   ^
```

[Bug c++/12944] [meta-bug] C++ name-lookup problems

[eczbek.void at gmail dot com via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=12944
Bug 12944 depends on bug 117061, which changed state.

Bug 117061 Summary: Error on use of parameter in lambda outside function body
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=117061

   What|Removed |Added

 Status|UNCONFIRMED |RESOLVED
 Resolution|--- |INVALID

[Bug c++/117061] Error on use of parameter in lambda outside function body

[eczbek.void at gmail dot com via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=117061

eczbek.void at gmail dot com changed:

   What|Removed |Added

 Resolution|--- |INVALID
 Status|UNCONFIRMED |RESOLVED

--- Comment #5 from eczbek.void at gmail dot com ---
This is probably invalid, because lambdas can only have captures if they are in
block scope, and the noexcept specifier/requires clause are outside it

https://eel.is/c++draft/expr.prim.lambda.capture#3
https://eel.is/c++draft/dcl.fct.def#nt:function-body
https://eel.is/c++draft/basic.scope.block#1

:(

[Bug c++/119807] New: constexpr counter thing causes ICE: in instantiate_decl, at cp/pt.cc:27844

[eczbek.void at gmail dot com via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=119807

Bug ID: 119807
   Summary: constexpr counter thing causes ICE: in
instantiate_decl, at cp/pt.cc:27844
   Product: gcc
   Version: 15.0
Status: UNCONFIRMED
  Severity: normal
  Priority: P3
 Component: c++
  Assignee: unassigned at gcc dot gnu.org
  Reporter: eczbek.void at gmail dot com
  Target Milestone: ---

https://godbolt.org/z/zaTaEWesh

Works fine with Clang

```
using size_t = decltype(0uz);

template
struct CounterReader {
template
friend auto counterFlag(CounterReader) noexcept;
};

template
struct CounterWriter {
static constexpr size_t value = current;

template
friend auto counterFlag(CounterReader) noexcept {}
};

template
[[nodiscard]] constexpr size_t counterAdvance() noexcept {
if constexpr (!mask) {
return CounterWriter::value;
} else if constexpr (requires { counterFlag(CounterReader()); }) {
return counterAdvance>
1)>();
} 
else {
return counterAdvance> 1)>();
}
}

constexpr auto defaultCounterTag = [] {};

template
constexpr size_t counter() noexcept {
return counterAdvance();
}

int main() {
static_assert(counter() == 1);
static_assert(counter() == 2);
}
```

```
Using built-in specs.
COLLECT_GCC=/opt/compiler-explorer/gcc-snapshot/bin/g++
Target: x86_64-linux-gnu
Configured with: ../gcc-trunk-20250414/configure
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#include "..." search starts here:
#include <...> search starts here:

/opt/compiler-explorer/gcc-trunk-20250414/bin/../lib/gcc/x86_64-linux-gnu/15.0.1/../../../../include/c++/15.0.1

/opt/compiler-explorer/gcc-trunk-20250414/bin/../lib/gcc/x86_64-linux-gnu/15.0.1/../../../../include/c++/15.0.1/x86_6

[Bug c++/119819] New: ICE on unexpanded template parameter pack

[eczbek.void at gmail dot com via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=119819

Bug ID: 119819
   Summary: ICE on unexpanded template parameter pack
   Product: gcc
   Version: 15.0
Status: UNCONFIRMED
  Severity: normal
  Priority: P3
 Component: c++
  Assignee: unassigned at gcc dot gnu.org
  Reporter: eczbek.void at gmail dot com
  Target Milestone: ---

https://godbolt.org/z/6bavox4Ma

```
template
constexpr int test = (..., [] requires(b == 0) { return a; }());

static_assert(test<0> == 0);
```

```
Using built-in specs.
COLLECT_GCC=/opt/compiler-explorer/gcc-snapshot/bin/g++
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ignoring duplicate directory
"/opt/compiler-explorer/gcc-trunk-20250415/bin/../lib/gcc/../../lib/gcc/x86_64-linux-gnu/15.0.1/../../../../include/c++/15.0.1"
ignoring duplicate directory
"/opt/compiler-explorer/gcc-trunk-20250415/bin/../lib/gcc/../../lib/gcc/x86_64-linux-gnu/15.0.1/../../../../include/c++/15.0.1/x86_64-linux-gnu"
ignoring duplicate directory
"/opt/compiler-explorer/gcc-trunk-20250415/bin/../lib/gcc/../../lib/gcc/x86_64-linux-gnu/15.0.1/../../../../include/c++/15.0.1/backward"
ignoring duplicate directory
"/opt/compiler-explorer/gcc-trunk-20250415/bin/../lib/gcc/../../lib/gcc/x86_64-linux-gnu/15.0.1/include"
ignoring nonexistent directory "/usr/local/include/x86_64-linux-gnu"
ignoring duplicate directory
"/opt/compiler-explorer/gcc-trunk-20250415/bin/../lib/gcc/../../lib/gcc/x86_64-linux-gnu/15.0.1/include-fixed/x86_64-linux-gnu"
ignoring duplicate directory
"/opt/compiler-explorer/gcc-trunk-20250415/bin/../lib/gcc/../../lib/gcc/x86_64-linux-gnu/15.0.1/include-fixed"
ignoring nonexistent directory
"/opt/compiler-explorer/gcc-trunk-20250415/bin/../lib/gcc/../../lib/gcc/x86_64-linux-gnu/15.0.1/../../../../x86_64-linux-gnu/include"
#include "..." search starts here:
#include <...> search starts here:

/opt/compiler-explorer/gcc-trunk-20250415/bin/../lib/gcc/x86_64-linux-gnu/15.0.1/../../../../include/c++/15.0.1

/opt/compiler-explorer/gcc-trunk-20250415/bin/../lib/gcc/x86_64-linux-gnu/15.0.1/../../../../include/c++/15.0.1/x86_64-linux-gnu

/opt/compiler-explorer/gcc-trunk-20250415/bin/../lib/gcc/x86_64-linux-gnu/15.0.1/../../../../include/c++/15.0.1/backward

/opt/compiler-explorer/gcc-trunk-20250415/bin/../lib/gcc/x86_64-linux-gnu/15.0.1/include

/opt/compiler-explorer/gcc-trunk-20250415/bin/../lib/gcc/x86_64-linux-gnu/15.0.1/include-fixed/x86_64-linux-gnu

/opt/compiler-explorer/gcc-trunk-20250415/bin/../lib/gcc/x86_64-linux-gnu/15.0.1/include-fixed
 /usr/local/include
 /opt/compiler-explorer/gcc-trunk-20250415/bin/../lib/gcc/../../include
 /usr/include/x86_64-linux-gnu
 /usr/include
End of search list.
Compiler executable checksum: 3fcf6743a4db937481e71ee19c98fb04
: In substitution of 'template  requires  b == 0 
[with int ...b = {}]':
:2:71:   required from 'constexpr const int test<0>'
2 | constexpr int test = (..., [] requires(b == 0) { return a