https://gcc.gnu.org/bugzilla/show_bug.cgi?id=99809
--- Comment #4 from 康桓瑋 <hewillk at gmail dot com> ---
Hey, the following code (a small variation with PR 100109) triggers the same
ICE in cp/constexpr.c:8889 on gcc 8-11, so maybe this is a regression bug?
template <class... Ts>
void f(Ts... args) {
[=]{
enum { x = [=]{ args; }() };
};
}
template void f<>();
<source>: In instantiation of 'void f(Ts ...) [with Ts = {}]':
<source>:8:19: required from here
<source>:4:16: sorry, unimplemented: unexpected AST of kind
nontype_argument_pack
4 | enum { x = [=]{ args; }() };
| ^~~~~~~~~~~~
<source>:4:16: internal compiler error: in potential_constant_expression_1, at
cp/constexpr.c:8889
0x1d02fb9 internal_error(char const*, ...)
???:0
0x6bb4f9 fancy_abort(char const*, int, char const*)
???:0
0x72a64f potential_constant_expression(tree_node*)
???:0
0x7b11c5 finish_function(bool)
???:0
0x80714a finish_lambda_function(tree_node*)
???:0
0x94ba0b tsubst_lambda_expr(tree_node*, tree_node*, int, tree_node*)
???:0
0x92c502 lookup_template_class(tree_node*, tree_node*, tree_node*, tree_node*,
int, int)
???:0
0x91848d tsubst(tree_node*, tree_node*, int, tree_node*)
???:0
0x918537 tsubst(tree_node*, tree_node*, int, tree_node*)
???:0
0x94ba02 tsubst_lambda_expr(tree_node*, tree_node*, int, tree_node*)
???:0
0x91e36f instantiate_decl(tree_node*, bool, bool)
???:0
0x96023b instantiate_pending_templates(int)
???:0
0x7cd659 c_parse_final_cleanups()
???:0
Please submit a full bug report,
with preprocessed source if appropriate.
Please include the complete backtrace with any bug report.
