https://gcc.gnu.org/bugzilla/show_bug.cgi?id=122075
Bug ID: 122075
Summary: ICE in coerce_template_parms, at cp/pt.cc:9496
Product: gcc
Version: 16.0
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/Wc7TqPvPx
template<auto = [] {}>
struct Base {};
template<typename T>
struct Derived : T {};
int main() {
requires { Derived<Base<>>(); };
}
Using built-in specs.
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#include "..." search starts here:
#include <...> search starts here:
/cefs/ca/cab9f43e062f54409fc782b3_gcc-trunk-20250926/bin/../lib/gcc/x86_64-linux-gnu/16.0.0/../../../../include/c++/16.0.0
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/cefs/ca/cab9f43e062f54409fc782b3_gcc-trunk-20250926/bin/../lib/gcc/x86_64-linux-gnu/16.0.0/../../../../include/c++/16.0.0/backward
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End of search list.
Compiler executable checksum: f885803d3d5d6d9021a9775d11bff93a
<source>: In function 'int main()':
<source>:8:32: internal compiler error: in coerce_template_parms, at
cp/pt.cc:9496
8 | requires { Derived<Base<>>(); };
| ^
0x28ca598 diagnostics::context::diagnostic_impl(rich_location*,
diagnostics::metadata const*, diagnostics::option_id, char const*,
__va_list_tag (*) [1], diagnostics::kind)
???:0
0x28bf4cb internal_error(char const*, ...)
???:0
0xb004b2 fancy_abort(char const*, int, char const*)
???:0
0xd6b65f lookup_template_class(tree_node*, tree_node*, tree_node*, tree_node*,
int)
???:0
0xdbb04c finish_template_type(tree_node*, tree_node*, int)
???:0
0xd359c3 c_parse_file()
???:0
0xea5509 c_common_parse_file()
???:0
Please submit a full bug report, with preprocessed source.
Please include the complete backtrace with any bug report.
See <https://gcc.gnu.org/bugs/> for instructions.
Preprocessed source stored into /tmp/cc0DeB2Z.out file, please attach this to
your bugreport.
Compiler returned: 1
