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<int = 0>
void f(){
[](auto) requires {} {}; // nonsense
}
int main() {
f();
}
```
Using built-in specs.
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Supported LTO compression algorithms: zlib
gcc version 15.0.0 20241031 (experimental)
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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
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#include "..." search starts here:
#include <...> search starts here:
/opt/compiler-explorer/gcc-trunk-20241101/bin/../lib/gcc/x86_64-linux-gnu/15.0.0/../../../../include/c++/15.0.0
/opt/compiler-explorer/gcc-trunk-20241101/bin/../lib/gcc/x86_64-linux-gnu/15.0.0/../../../../include/c++/15.0.0/x86_64-linux-gnu
/opt/compiler-explorer/gcc-trunk-20241101/bin/../lib/gcc/x86_64-linux-gnu/15.0.0/../../../../include/c++/15.0.0/backward
/opt/compiler-explorer/gcc-trunk-20241101/bin/../lib/gcc/x86_64-linux-gnu/15.0.0/include
/opt/compiler-explorer/gcc-trunk-20241101/bin/../lib/gcc/x86_64-linux-gnu/15.0.0/include-fixed/x86_64-linux-gnu
/opt/compiler-explorer/gcc-trunk-20241101/bin/../lib/gcc/x86_64-linux-gnu/15.0.0/include-fixed
/usr/local/include
/opt/compiler-explorer/gcc-trunk-20241101/bin/../lib/gcc/../../include
/usr/include/x86_64-linux-gnu
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End of search list.
Compiler executable checksum: 5d8cc5497c4520f4a130bfbfe118f13a
<source>: In function 'void f()':
<source>:3:27: error: missing additional 'requires' to start a
requires-expression [-Wtemplate-body]
3 | [](auto) requires {} {};
| ^
| requires
<source>:3:28: error: expected primary-expression before '}' token
[-Wtemplate-body]
3 | [](auto) requires {} {};
| ^
<source>:3:28: error: expected ';' before '}' token [-Wtemplate-body]
3 | [](auto) requires {} {};
| ^
| ;
<source>: In instantiation of 'void f() [with int <anonymous> = 0]':
<source>:7:3: required from here
7 | f();
| ~^~
<source>:3:12: error: '<anonymous>' has incomplete type
3 | [](auto) requires {} {};
| ^~~~
<source>:3:9: error: invalid use of template type parameter 'auto:1'
3 | [](auto) requires {} {};
| ^~~~~~~~~~~~~~~~~~~~~~~
<source>:3:9: internal compiler error: in type_dependent_expression_p, at
cp/pt.cc:28727
0x287d6a5 diagnostic_context::diagnostic_impl(rich_location*,
diagnostic_metadata const*, diagnostic_option_id, char const*, __va_list_tag
(*) [1], diagnostic_t)
???:0
0x28940c5 internal_error(char const*, ...)
???:0
0xa90afe fancy_abort(char const*, int, char const*)
???:0
0x176aa6c walk_tree_1(tree_node**, tree_node* (*)(tree_node**, int*, void*),
void*, hash_set<tree_node*, false, default_hash_traits<tree_node*> >*,
tree_node* (*)(tree_node**, int*, tree_node* (*)(tree_node**, int*, void*),
void*, hash_set<tree_node*, false, default_hash_traits<tree_node*> >*))
???:0
0x176e427 walk_tree_without_duplicates_1(tree_node**, tree_node*
(*)(tree_node**, int*, void*), void*, tree_node* (*)(tree_node**, int*,
tree_node* (*)(tree_node**, int*, void*), void*, hash_set<tree_node*, false,
default_hash_traits<tree_node*> >*))
???:0
0xcb3b8a instantiation_dependent_expression_p(tree_node*)
???:0
0x176aa6c walk_tree_1(tree_node**, tree_node* (*)(tree_node**, int*, void*),
void*, hash_set<tree_node*, false, default_hash_traits<tree_node*> >*,
tree_node* (*)(tree_node**, int*, tree_node* (*)(tree_node**, int*, void*),
void*, hash_set<tree_node*, false, default_hash_traits<tree_node*> >*))
???:0
0x176ac82 walk_tree_1(tree_node**, tree_node* (*)(tree_node**, int*, void*),
void*, hash_set<tree_node*, false, default_hash_traits<tree_node*> >*,
tree_node* (*)(tree_node**, int*, tree_node* (*)(tree_node**, int*, void*),
void*, hash_set<tree_node*, false, default_hash_traits<tree_node*> >*))
???:0
0x176b15d walk_tree_1(tree_node**, tree_node* (*)(tree_node**, int*, void*),
void*, hash_set<tree_node*, false, default_hash_traits<tree_node*> >*,
tree_node* (*)(tree_node**, int*, tree_node* (*)(tree_node**, int*, void*),
void*, hash_set<tree_node*, false, default_hash_traits<tree_node*> >*))
???:0
0xb2be03 cp_fold_function(tree_node*)
???:0
0xb7cc66 finish_function(bool)
???:0
0xbc2c82 maybe_add_lambda_conv_op(tree_node*)
???:0
0xcce98c tsubst_lambda_expr(tree_node*, tree_node*, int, tree_node*)
???:0
0xcc618d instantiate_decl(tree_node*, bool, bool)
???:0
0xd00deb instantiate_pending_templates(int)
???:0
0xb95e5b c_parse_final_cleanups()
???:0
0xdf8318 c_common_parse_file()
???:0
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Compiler returned: 1
