[Bug c++/96623] New: [10/11 Regression] ICE in inject_parm_decls, at cp/parser.c:23893

[haoxintu at gmail dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=96623

            Bug ID: 96623
           Summary: [10/11 Regression] ICE in inject_parm_decls, at
                    cp/parser.c:23893
           Product: gcc
           Version: 11.0
            Status: UNCONFIRMED
          Keywords: ice-on-invalid-code
          Severity: normal
          Priority: P3
         Component: c++
          Assignee: unassigned at gcc dot gnu.org
          Reporter: haoxintu at gmail dot com
  Target Milestone: ---

Input:
//small.cc
struct A{ 
    void a(){
        struct B {  
            void b () noexcept();
            };
    }
};

Command:
g++ small.cc

Output:
small.cc: In member function ‘void A::a()’:
small.cc:5:25: internal compiler error: in inject_parm_decls, at
cp/parser.c:23893
    5 |                         };
      |                         ^
0x67450f inject_parm_decls
        ../../gcc/cp/parser.c:23893
0x67450f cp_parser_class_specifier_1
        ../../gcc/cp/parser.c:24239
0x9d3143 cp_parser_class_specifier
        ../../gcc/cp/parser.c:24308
0x9d3143 cp_parser_type_specifier
        ../../gcc/cp/parser.c:17811
0x9d40be cp_parser_decl_specifier_seq
        ../../gcc/cp/parser.c:14436
0x9d4e71 cp_parser_simple_declaration
        ../../gcc/cp/parser.c:13690
0x9d6fdd cp_parser_declaration_statement
        ../../gcc/cp/parser.c:13249
0x9d7c67 cp_parser_statement
        ../../gcc/cp/parser.c:11555
0x9d8ccd cp_parser_statement_seq_opt
        ../../gcc/cp/parser.c:11921
0x9d8da8 cp_parser_compound_statement
        ../../gcc/cp/parser.c:11871
0x9f0ee5 cp_parser_function_body
        ../../gcc/cp/parser.c:23170
0x9f0ee5 cp_parser_ctor_initializer_opt_and_function_body
        ../../gcc/cp/parser.c:23221
0x9f4510 cp_parser_function_definition_after_declarator
        ../../gcc/cp/parser.c:29117
0x9f590c cp_parser_late_parsing_for_member
        ../../gcc/cp/parser.c:30019
0x9d225b cp_parser_class_specifier_1
        ../../gcc/cp/parser.c:24284
0x9d3143 cp_parser_class_specifier
        ../../gcc/cp/parser.c:24308
0x9d3143 cp_parser_type_specifier
        ../../gcc/cp/parser.c:17811
0x9d40be cp_parser_decl_specifier_seq
        ../../gcc/cp/parser.c:14436
0x9d4e71 cp_parser_simple_declaration
        ../../gcc/cp/parser.c:13690
0xa002fe cp_parser_declaration
        ../../gcc/cp/parser.c:13510
Please submit a full bug report,
with preprocessed source if appropriate.
Please include the complete backtrace with any bug report.
See <https://gcc.gnu.org/bugs/> for instructions.

GCC-10 compiles this code ok, and I test in GCC-trunk-20200808.