https://gcc.gnu.org/bugzilla/show_bug.cgi?id=118672
Bug ID: 118672
Summary: ICE on invalid template lambda expression
Product: gcc
Version: 14.2.1
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: c++
Assignee: unassigned at gcc dot gnu.org
Reporter: fchelnokov at gmail dot com
Target Milestone: ---
This program
```
auto l = []<int>() -> decltype([]<int=0>{})
{ return {}; }.template operator()<0>;
```
is invalid (missed () before last semicolon), but it makes GCC print:
```
internal compiler error: error reporting routines re-entered.
0x203063d diagnostic_context::report_diagnostic(diagnostic_info*)
???:0
0x2030fb8 warning(int, char const*, ...)
???:0
0x8147df start_preparsed_function(tree_node*, tree_node*, int)
???:0
0x856029 start_lambda_function(tree_node*, tree_node*)
???:0
0x944797 tsubst_lambda_expr(tree_node*, tree_node*, int, tree_node*)
???:0
0x939c70 tsubst(tree_node*, tree_node*, int, tree_node*)
???:0
0x2043afe pp_format(pretty_printer*, text_info*, urlifier const*)
???:0
0x2030477 diagnostic_context::report_diagnostic(diagnostic_info*)
???:0
0x2031415 permerror(unsigned int, char const*, ...)
???:0
0x7b12b7 instantiate_type(tree_node*, tree_node*, int)
???:0
0x9a7390 store_init_value(tree_node*, tree_node*, vec<tree_node*, va_gc,
vl_embed>**, int)
???:0
0x8276ee cp_finish_decl(tree_node*, tree_node*, bool, tree_node*, int,
cp_decomp*)
???:0
0x90ee14 c_parse_file()
???:0
0xa0d1b9 c_common_parse_file()
???:0
Please submit a full bug report, with preprocessed source (by using
-freport-bug).
Please include the complete backtrace with any bug report.
See <https://gcc.gnu.org/bugs/> for instructions.
```
Online demo: https://gcc.godbolt.org/z/W8ExeToW9
