[Bug c++/101818] New: Error message for the wrong name in designated initializers could be improved

[hewillk at gmail dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=101818

            Bug ID: 101818
           Summary: Error message for the wrong name in designated
                    initializers could be improved
           Product: gcc
           Version: 12.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: c++
          Assignee: unassigned at gcc dot gnu.org
          Reporter: hewillk at gmail dot com
  Target Milestone: ---

Consider: https://godbolt.org/z/8xrocoTcG

struct Op { int a, b; };
Op op{.a = 0,
      .x = 0,


      .b = 0};


Clang rejects with:
<source>:3:8: error: field designator 'x' does not refer to any field in type
'Op'
      .x = 0,
       ^
However, GCC rejects with:
<source>:6:13: error: 'Op' has no non-static data member named 'x'
    6 |       .b = 0};
      |             ^


It would be less confusing and more user-friendly if the cursor can actually
point to the x.