[Bug libstdc++/125404] [17 regression] gcc/cobol/symfind.cc:526:45: error: array subscript -1 is outside array bounds of 'long unsigned int [1152921504606846975]' [-Werror=array-bounds=] [r17-603-gacfdad706d8acc]

[schwab--- via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=125404

--- Comment #2 from Andreas Schwab <sch...@linux-m68k.org> ---
Workaround for the rust failure:

diff --git a/gcc/rust/lex/rust-token.cc b/gcc/rust/lex/rust-token.cc
index a19bed5bc5b..391d18dab5b 100644
--- a/gcc/rust/lex/rust-token.cc
+++ b/gcc/rust/lex/rust-token.cc
@@ -248,12 +248,20 @@ Token::as_string () const
          if (get_type_hint () == CORETYPE_UNKNOWN)
            return get_str ();
          else
-           return get_str () + get_type_hint_str ();
+           {
+             std::string s = get_str ();
+             s += get_type_hint_str ();
+             return s;
+           }
        case FLOAT_LITERAL:
          if (get_type_hint () == CORETYPE_UNKNOWN)
            return get_str ();
          else
-           return get_str () + get_type_hint_str ();
+           {
+             std::string s = get_str ();
+             s += get_type_hint_str ();
+             return s;
+           }
        default:
          return get_str ();
        }