https://gcc.gnu.org/bugzilla/show_bug.cgi?id=118323
--- Comment #1 from Jonathan Wakely <redi at gcc dot gnu.org> ---
Clang does better:
esc.cc:8:3: error: call to immediate function 'func()::(anonymous
class)::operator()' is not a constant expression
8 | []{
| ^
esc.cc:1:43: note: subexpression not valid in a constant expression
1 | consteval int check(int i) { if (i > 100) throw; return i; }
| ^~~~~
esc.cc:9:10: note: in call to 'check(101)'
9 | funk(check(101));
| ^~~~~~~~~~
esc.cc:8:3: note: in call to '[] {
funk(check(101));
}.operator()()'
8 | []{
| ^~~
9 | funk(check(101));
| ~~~~~~~~~~~~~~~~~
10 | }();
| ~~~
1 error generated.
EDG gives the exact same error with or without -DLAMBDA:
"esc.cc", line 12: error: call to consteval function "check" did not produce a
valid constant expression
funk(check(101));
^
"esc.cc", line 1: note: expression cannot be interpreted
consteval int check(int i) { if (i > 100) throw; return i; }
^
1 error detected in the compilation of "esc.cc".
