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From: "johelegp at gmail dot com" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug c++/107276] New: ICE Deducting return type from ill-formed
 structured binding name
Date: Sun, 16 Oct 2022 00:48:55 +0000
X-Bugzilla-Reason: CC
X-Bugzilla-Type: new
X-Bugzilla-Watch-Reason: None
X-Bugzilla-Product: gcc
X-Bugzilla-Component: c++
X-Bugzilla-Version: 13.0
X-Bugzilla-Keywords: ice-on-invalid-code
X-Bugzilla-Severity: normal
X-Bugzilla-Who: johelegp at gmail dot com
X-Bugzilla-Status: UNCONFIRMED
X-Bugzilla-Resolution: 
X-Bugzilla-Priority: P3
X-Bugzilla-Assigned-To: unassigned at gcc dot gnu.org
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D107276

            Bug ID: 107276
           Summary: ICE Deducting return type from ill-formed structured
                    binding name
           Product: gcc
           Version: 13.0
            Status: UNCONFIRMED
          Keywords: ice-on-invalid-code
          Severity: normal
          Priority: P3
         Component: c++
          Assignee: unassigned at gcc dot gnu.org
          Reporter: johelegp at gmail dot com
                CC: johelegp at gmail dot com
  Target Milestone: ---

See https://compiler-explorer.com/z/6MqKTjKd7.

```C++
auto f(auto x) {
  auto [y] =3D x;
  return y;
}
int i =3D f(0);
```

```
<source>: In instantiation of 'auto f(auto:1) [with auto:1 =3D int]':
<source>:5:10:   required from here
<source>:2:8: error: cannot decompose non-array non-class type 'int'
    2 |   auto [y] =3D x;
      |        ^~~
<source>:3:10: internal compiler error: tree check: expected non_lvalue_exp=
r or
static_cast_expr, have error_mark in set_implicit_rvalue_p, at
cp/cp-tree.h:8688
    3 |   return y;
      |          ^
0x236ef7e internal_error(char const*, ...)
        ???:0
0x95b166 tree_check_failed(tree_node const*, char const*, int, char const*,
...)
        ???:0
0xc9d1ca do_auto_deduction(tree_node*, tree_node*, tree_node*, int,
auto_deduction_context, tree_node*, int)
        ???:0
0xd4e054 check_return_expr(tree_node*, bool*)
        ???:0
0xcf39f3 finish_return_stmt(tree_node*)
        ???:0
0xcad9e6 instantiate_decl(tree_node*, bool, bool)
        ???:0
0xb8e015 maybe_instantiate_decl(tree_node*)
        ???:0
0xb8fa9e mark_used(tree_node*, int)
        ???:0
0xad275e build_new_function_call(tree_node*, vec<tree_node*, va_gc,
vl_embed>**, int)
        ???:0
0xcf93c8 finish_call_expr(tree_node*, vec<tree_node*, va_gc, vl_embed>**, b=
ool,
bool, int)
        ???:0
0xc806a7 c_parse_file()
        ???:0
0xdbdef9 c_common_parse_file()
        ???:0
Please submit a full bug report, with preprocessed source (by using
-freport-bug).
Please include the complete backtrace with any bug report.
See <https://gcc.gnu.org/bugs/> for instructions.
Compiler returned: 1
```=