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 = []<typename...>(auto...) {}>
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-20241109/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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--enable-multilib --enable-clocale=gnu
--enable-languages=c,c++,fortran,ada,objc,obj-c++,go,d,rust,m2 --enable-ld=yes
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--with-pkgversion=Compiler-Explorer-Build-gcc-440be01b07941506d1c8819448bd17c8717d55f5-binutils-2.42
Thread model: posix
Supported LTO compression algorithms: zlib
gcc version 15.0.0 20241107 (experimental)
(Compiler-Explorer-Build-gcc-440be01b07941506d1c8819448bd17c8717d55f5-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/'
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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
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
"/opt/compiler-explorer/gcc-trunk-20241109/bin/../lib/gcc/x86_64-linux-gnu/15.0.0/../../../../x86_64-linux-gnu/include"
ignoring duplicate directory
"/opt/compiler-explorer/gcc-trunk-20241109/bin/../lib/gcc/../../lib/gcc/x86_64-linux-gnu/15.0.0/../../../../include/c++/15.0.0"
ignoring duplicate directory
"/opt/compiler-explorer/gcc-trunk-20241109/bin/../lib/gcc/../../lib/gcc/x86_64-linux-gnu/15.0.0/../../../../include/c++/15.0.0/x86_64-linux-gnu"
ignoring duplicate directory
"/opt/compiler-explorer/gcc-trunk-20241109/bin/../lib/gcc/../../lib/gcc/x86_64-linux-gnu/15.0.0/../../../../include/c++/15.0.0/backward"
ignoring duplicate directory
"/opt/compiler-explorer/gcc-trunk-20241109/bin/../lib/gcc/../../lib/gcc/x86_64-linux-gnu/15.0.0/include"
ignoring nonexistent directory "/usr/local/include/x86_64-linux-gnu"
ignoring duplicate directory
"/opt/compiler-explorer/gcc-trunk-20241109/bin/../lib/gcc/../../lib/gcc/x86_64-linux-gnu/15.0.0/include-fixed/x86_64-linux-gnu"
ignoring duplicate directory
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ignoring nonexistent directory
"/opt/compiler-explorer/gcc-trunk-20241109/bin/../lib/gcc/../../lib/gcc/x86_64-linux-gnu/15.0.0/../../../../x86_64-linux-gnu/include"
#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
<source>:1:40: error: too many template parameter lists in declaration of
'<lambda>'
1 | template<auto = []<typename...>(auto...) {}>
| ^
<source>:1:43: internal compiler error: in poplevel_class, at
cp/name-lookup.cc:5712
1 | template<auto = []<typename...>(auto...) {}>
| ^
0x289ac95 diagnostic_context::diagnostic_impl(rich_location*,
diagnostic_metadata const*, diagnostic_option_id, char const*, __va_list_tag
(*) [1], diagnostic_t)
???:0
0x28b1685 internal_error(char const*, ...)
???:0
0xa9289c fancy_abort(char const*, int, char const*)
???:0
0xad8cfc popclass()
???:0
0xae99fe finish_struct(tree_node*, tree_node*)
???:0
0xca0a6a c_parse_file()
???:0
0xdfab69 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/ccg3Ixa0.out file, please attach this to
your bugreport.
Compiler returned: 1
