[Bug c/98621] New: ICE: x from g referenced in f

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

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=98621

            Bug ID: 98621
           Summary: ICE: x from g referenced in f
           Product: gcc
           Version: 11.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: c
          Assignee: unassigned at gcc dot gnu.org
          Reporter: acoplan at gcc dot gnu.org
  Target Milestone: ---

Here is an error-recovery ICE:

$ cat test.c
int f() {
  int g(x) int x;
  int a[x];
}
$ aarch64-elf-gcc -c test.c
test.c: In function 'g':
test.c:4:1: error: expected declaration specifiers before '}' token
    4 | }
      | ^
test.c:3:7: error: declaration for parameter 'a' but no such parameter
    3 |   int a[x];
      |       ^
test.c:5: error: expected '{' at end of input
test.c: In function 'f':
test.c:4:1: error: expected declaration or statement at end of input
    4 | }
      | ^
test.c:1:5: internal compiler error: x from g referenced in f
    1 | int f() {
      |     ^
0xeae7e0 convert_nonlocal_reference_op
        /home/alecop01/toolchain/src/gcc/gcc/tree-nested.c:1163
0x1181546 walk_tree_1(tree_node**, tree_node* (*)(tree_node**, int*, void*),
void*, hash_set<tree_node*, false, default_hash_traits<tree_node*> >*,
tree_node* (*)(tree_node**, int*, tree_node* (*)(tree_node**, int*, void*),
void*, hash_set<tree_node*, false, default_hash_traits<tree_node*> >*))
        /home/alecop01/toolchain/src/gcc/gcc/tree.c:12095
0xaa2a6c walk_gimple_op(gimple*, tree_node* (*)(tree_node**, int*, void*),
walk_stmt_info*)
        /home/alecop01/toolchain/src/gcc/gcc/gimple-walk.c:202
0xaa384e walk_gimple_stmt(gimple_stmt_iterator*, tree_node*
(*)(gimple_stmt_iterator*, bool*, walk_stmt_info*), tree_node* (*)(tree_node**,
int*, void*), walk_stmt_info*)
        /home/alecop01/toolchain/src/gcc/gcc/gimple-walk.c:596
0xaa3b2c walk_gimple_seq_mod(gimple**, tree_node* (*)(gimple_stmt_iterator*,
bool*, walk_stmt_info*), tree_node* (*)(tree_node**, int*, void*),
walk_stmt_info*)
        /home/alecop01/toolchain/src/gcc/gcc/gimple-walk.c:51
0xaa38ca walk_gimple_stmt(gimple_stmt_iterator*, tree_node*
(*)(gimple_stmt_iterator*, bool*, walk_stmt_info*), tree_node* (*)(tree_node**,
int*, void*), walk_stmt_info*)
        /home/alecop01/toolchain/src/gcc/gcc/gimple-walk.c:605
0xaa3b2c walk_gimple_seq_mod(gimple**, tree_node* (*)(gimple_stmt_iterator*,
bool*, walk_stmt_info*), tree_node* (*)(tree_node**, int*, void*),
walk_stmt_info*)
        /home/alecop01/toolchain/src/gcc/gcc/gimple-walk.c:51
0xea87ca walk_body
        /home/alecop01/toolchain/src/gcc/gcc/tree-nested.c:811
0xea8857 walk_function
        /home/alecop01/toolchain/src/gcc/gcc/tree-nested.c:822
0xea8857 walk_all_functions
        /home/alecop01/toolchain/src/gcc/gcc/tree-nested.c:887
0xeb3bf1 lower_nested_functions(tree_node*)
        /home/alecop01/toolchain/src/gcc/gcc/tree-nested.c:3698
0x8d883b cgraph_node::analyze()
        /home/alecop01/toolchain/src/gcc/gcc/cgraphunit.c:676
0x8db7d2 analyze_functions
        /home/alecop01/toolchain/src/gcc/gcc/cgraphunit.c:1235
0x8dcc87 symbol_table::finalize_compilation_unit()
        /home/alecop01/toolchain/src/gcc/gcc/cgraphunit.c:2513
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