https://gcc.gnu.org/bugzilla/show_bug.cgi?id=96636

            Bug ID: 96636
           Summary: ICE in build_value_init_noctor, at cp/init.c:451
           Product: gcc
           Version: 11.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: c++
          Assignee: unassigned at gcc dot gnu.org
          Reporter: haoxintu at gmail dot com
  Target Milestone: ---

Input:
//small.cc
typedef class {
  class a {}; 
  class : virtual a {};
} b;
void foo(){ b{};}

Command:
g++ small.cc

Output:
small.cc: In function ‘void foo()’:
small.cc:5:15: internal compiler error: in build_value_init_noctor, at
cp/init.c:451
    5 | void foo(){ b{};}
      |               ^
0x659bfa build_value_init_noctor(tree_node*, int)
        ../../gcc/cp/init.c:451
0x978b75 build_value_init(tree_node*, int)
        ../../gcc/cp/init.c:379
0x8adee2 build_new_method_call_1
        ../../gcc/cp/call.c:10234
0x8b1b90 build_new_method_call(tree_node*, tree_node*, vec<tree_node*, va_gc,
vl_embed>**, tree_node*, int, tree_node**, int)
        ../../gcc/cp/call.c:10467
0x8b1b90 build_special_member_call(tree_node*, tree_node*, vec<tree_node*,
va_gc, vl_embed>**, tree_node*, int, int)
        ../../gcc/cp/call.c:9870
0x8b2134 perform_direct_initialization_if_possible(tree_node*, tree_node*,
bool, int)
        ../../gcc/cp/call.c:11966
0xab5b79 build_static_cast_1
        ../../gcc/cp/typeck.c:7481
0xab6f12 cp_build_c_cast(unsigned int, tree_node*, tree_node*, int)
        ../../gcc/cp/typeck.c:8298
0xac04ed build_functional_cast_1
        ../../gcc/cp/typeck2.c:2380
0xac04ed build_functional_cast(unsigned int, tree_node*, tree_node*, int)
        ../../gcc/cp/typeck2.c:2413
0xa6fda7 finish_compound_literal(tree_node*, tree_node*, int, fcl_t)
        ../../gcc/cp/semantics.c:2977
0x9cc33a cp_parser_functional_cast
        ../../gcc/cp/parser.c:29684
0x9e4917 cp_parser_postfix_expression
        ../../gcc/cp/parser.c:7251
0x9c665a cp_parser_binary_expression
        ../../gcc/cp/parser.c:9641
0x9c83ee cp_parser_assignment_expression
        ../../gcc/cp/parser.c:9946
0x9c8712 cp_parser_expression
        ../../gcc/cp/parser.c:10114
0x9cbdf8 cp_parser_expression_statement
        ../../gcc/cp/parser.c:11774
0x9d72eb cp_parser_statement
        ../../gcc/cp/parser.c:11570
0x9d8ccd cp_parser_statement_seq_opt
        ../../gcc/cp/parser.c:11921
0x9d8da8 cp_parser_compound_statement
        ../../gcc/cp/parser.c:11871
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.

Noted that all GCC-5 onwards versions behave the same.

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