[Bug c++/79627] New: ICE in expand_expr_real_1, at expr.c:9804

[marxin at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=79627

            Bug ID: 79627
           Summary: ICE in expand_expr_real_1, at expr.c:9804
           Product: gcc
           Version: unknown
            Status: UNCONFIRMED
          Keywords: ice-on-valid-code
          Severity: normal
          Priority: P3
         Component: c++
          Assignee: unassigned at gcc dot gnu.org
          Reporter: marxin at gcc dot gnu.org
                CC: jason at gcc dot gnu.org
  Target Milestone: ---

Following test-case (reduced from llvm test-suite) fails:

$ cat /tmp/ice.C
long a;
void
b ()
{
  long buffer[a];
  [&] { __typeof(buffer) c; }();
}

$ ./xg++ -B. /tmp/ice.C
/tmp/ice.C: In lambda function:
/tmp/ice.C:6:26: internal compiler error: in expand_expr_real_1, at expr.c:9804
   [&] { __typeof(buffer) c; }();
                          ^
0x911fae expand_expr_real_1(tree_node*, rtx_def*, machine_mode,
expand_modifier, rtx_def**, bool)
        ../../gcc/expr.c:9798
0x920584 expand_expr
        ../../gcc/expr.h:276
0x920584 expand_expr_real_2(separate_ops*, rtx_def*, machine_mode,
expand_modifier)
        ../../gcc/expr.c:8301
0x830f0d expand_gimple_stmt_1
        ../../gcc/cfgexpand.c:3676
0x830f0d expand_gimple_stmt
        ../../gcc/cfgexpand.c:3737
0x832345 expand_gimple_basic_block
        ../../gcc/cfgexpand.c:5744
0x8371b6 execute
        ../../gcc/cfgexpand.c:6357

All releases I have ICE on that. As accepted by clang, I'm adding valid code
keyword.