[clang++] Worse diagnostics and no fixit for misspelled variable since version 21

[vedgy]

For the following C++ code

class C{ int someVariable; };
int main() { C c; c.someVariablf = 1; }

Clang 20.1.8 or earlier prints:

<source>:2:21: error: no member named 'someVariablf' in 'C'; did you mean 'someVariable'?
    2 | int main() { C c; c.someVariablf = 1; }
      |                     ^~~~~~~~~~~~
      |                     someVariable
<source>:1:14: note: 'someVariable' declared here
    1 | class C{ int someVariable; };
      |              ^
1 error generated.
Compiler returned: 1

Clang 21.1.0 or later prints less useful info:

<source>:2:21: error: no member named 'someVariablf' in 'C'
    2 | int main() { C c; c.someVariablf = 1; }
      |                   ~ ^
1 error generated.
Compiler returned: 1

Compiler explorer link

[shafik]

This was purposeful, please see: #143423

[vedgy]

I see. In a related comment thread https://github.com/llvm/llvm-project/pull/143423/files#r2136384810 the author of the pull request replied:

It's one of the cases where we were relying on delayed typo correction for the typo; not certain why though. We lost a few such diagnostics that we'll want to recover someday.

So I guess this issue can stay open to remind about the desired recovery of such diagnostics?