[Bug c++/84430] New: [7/8 Regression] ICE with #pragma omp simd in lambda

["reichelt at gcc dot gnu.org" <gcc-bugzilla at gcc dot gnu dot org>]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=84430

            Bug ID: 84430
           Summary: [7/8 Regression] ICE with #pragma omp simd in lambda
           Product: gcc
           Version: 8.0
            Status: UNCONFIRMED
          Keywords: ice-on-valid-code, openmp
          Severity: normal
          Priority: P3
         Component: c++
          Assignee: unassigned at gcc dot gnu.org
          Reporter: reichelt at gcc dot gnu.org
  Target Milestone: ---

The following valid code snippet (compiled with "-std=c++1z -fopenmp")
triggers an ICE since GCC 7.1.0:

=======================================
void foo()
{
  []{
    #pragma omp simd
    for (int i = 0; i < 10; ++i)
      ;
  };
}
=======================================

bug.cc: In lambda function:
bug.cc:7:3: sorry, unimplemented: unexpected AST of kind omp_simd
   };
   ^
bug.cc:7:3: internal compiler error: in potential_constant_expression_1, at
cp/constexpr.c:5993
0x857e92 potential_constant_expression_1
        ../../gcc/gcc/cp/constexpr.c:5993
0x8975c6 finish_function(bool)
        ../../gcc/gcc/cp/decl.c:15671
0x8d83c2 finish_lambda_function(tree_node*)
        ../../gcc/gcc/cp/lambda.c:1384
0x91d8c1 cp_parser_lambda_body
        ../../gcc/gcc/cp/parser.c:10675
0x91d8c1 cp_parser_lambda_expression
        ../../gcc/gcc/cp/parser.c:10176
0x91d8c1 cp_parser_primary_expression
        ../../gcc/gcc/cp/parser.c:5257
0x9301bc cp_parser_postfix_expression
        ../../gcc/gcc/cp/parser.c:7026
0x930d90 cp_parser_unary_expression
        ../../gcc/gcc/cp/parser.c:8318
0x91117f cp_parser_cast_expression
        ../../gcc/gcc/cp/parser.c:9086
0x91198a cp_parser_binary_expression
        ../../gcc/gcc/cp/parser.c:9187
0x913164 cp_parser_assignment_expression
        ../../gcc/gcc/cp/parser.c:9476
0x913878 cp_parser_expression
        ../../gcc/gcc/cp/parser.c:9645
0x915538 cp_parser_expression_statement
        ../../gcc/gcc/cp/parser.c:11112
0x91b8ad cp_parser_statement
        ../../gcc/gcc/cp/parser.c:10916
0x91cdc0 cp_parser_statement_seq_opt
        ../../gcc/gcc/cp/parser.c:11255
0x91ce97 cp_parser_compound_statement
        ../../gcc/gcc/cp/parser.c:11209
0x933610 cp_parser_function_body
        ../../gcc/gcc/cp/parser.c:21750
0x933610 cp_parser_ctor_initializer_opt_and_function_body
        ../../gcc/gcc/cp/parser.c:21787
0x933ec0 cp_parser_function_definition_after_declarator
        ../../gcc/gcc/cp/parser.c:26688
0x934bd7 cp_parser_function_definition_from_specifiers_and_declarator
        ../../gcc/gcc/cp/parser.c:26604
Please submit a full bug report, [etc.]