https://gcc.gnu.org/bugzilla/show_bug.cgi?id=120618
Bug ID: 120618
Summary: ICE: tree check: expected template_type_parm, have
boolean_type in write_requirement, at
cp/mangle.cc:3134
Product: gcc
Version: 16.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: c++
Assignee: unassigned at gcc dot gnu.org
Reporter: iamanonymous.cs at gmail dot com
Target Milestone: ---
Target: x86_64
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The compiler produces an internal error during write_requirement when compiling
the provided code with the specified options.
The issue can also be reproduced on Compiler Explorer.
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OS and Platform:
# uname -a
Linux ubuntu 4.15.0-213-generic #224-Ubuntu SMP Mon Jun 19 13:30:12 UTC 2023
x86_64 x86_64 x86_64 GNU/Linux
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# g++ -v
Using built-in specs.
COLLECT_GCC=g++
COLLECT_LTO_WRAPPER=/root/gdbtest/gcc/gcc-250610/libexec/gcc/x86_64-pc-linux-gnu/16.0.0/lto-wrapper
Target: x86_64-pc-linux-gnu
Configured with: ../gcc-master/configure --prefix=/root/gdbtest/gcc/gcc-250610
--enable-languages=c,c++ --disable-multilib --disable-bootstrap :
(reconfigured) ../gcc-master/configure --prefix=/root/gdbtest/gcc/gcc-250610
--enable-languages=c,c++ --disable-multilib --disable-bootstrap
Thread model: posix
Supported LTO compression algorithms: zlib
gcc version 16.0.0 20250610 (experimental) (GCC)
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Program:
#cat code.cpp
#include<iostream>
#include<cstring>
#include<vector>
class A{};
class B{};
bool foo(A a) {
return true;
}
template<typename T>
requires !requires(T a) { { foo(a) } -> bool }
bool foo(T a) {
return true;
}
int main() {
A a;
B b;
foo(a);
foo(b);
}
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Command Lines:
gcc code.cpp -std=c++20 -Werror -Wunused-result -c -o code_0.o
<source>:14:42: error: return-type-requirement is not a type-constraint
14 | requires !requires(T a) { { foo(a) } -> bool }
| ^~~~
<source>:14:46: error: expected ';' before '}' token
14 | requires !requires(T a) { { foo(a) } -> bool }
| ^~
| ;
<source>:14:11: error: expression must be enclosed in parentheses
14 | requires !requires(T a) { { foo(a) } -> bool }
| ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
| ( )
<source>: In substitution of 'template<class T> requires !requires(T a)
{{foo(A)(a)} -> bool;} bool foo(T) [with T = B]':
<source>:14:33: required by substitution of 'template<class T> requires
!requires(T a) {{foo(A)(a)} -> bool;} bool foo(T) [with T = B]'
14 | requires !requires(T a) { { foo(a) } -> bool }
| ~~~^~~
<source>:24:7: required from here
24 | foo(b);
| ~~~^~~
<source>:15:7: required by the constraints of 'template<class T> requires
!requires(T a) {{foo(A)(a)} -> bool;} bool foo(T)'
<source>:14:11: error: satisfaction of atomic constraint '!requires(T a)
{{foo(A)(a)} -> bool;} [with T = T]' depends on itself
14 | requires !requires(T a) { { foo(a) } -> bool }
| ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
<source>:15:7: internal compiler error: tree check: expected
template_type_parm, have boolean_type in write_requirement, at
cp/mangle.cc:3134
15 | bool foo(T a) {
| ^~~
0x282f995 diagnostic_context::diagnostic_impl(rich_location*,
diagnostic_metadata const*, diagnostic_option_id, char const*, __va_list_tag
(*) [1], diagnostic_t)
???:0
0x284de16 internal_error(char const*, ...)
???:0
0x9e4d68 tree_check_failed(tree_node const*, char const*, int, char const*,
...)
???:0
0xc2d3f9 mangle_decl(tree_node*)
???:0
0x17ee7b5 decl_assembler_name(tree_node*)
???:0
0xf43ea1 symbol_table::finalize_compilation_unit()
???:0
Please submit a full bug report, with preprocessed source (by using
-freport-bug).
Please include the complete backtrace with any bug report.
See <https://gcc.gnu.org/bugs/> for instructions.
Compiler returned: 1
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Also ICE on trunk, compiler explorer:https://gcc.godbolt.org/z/4jM4vqbGe
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