Invalid f-string conversion type code parses/passes

[MeGaGiGaGon]

Summary

It feels like this code should be rejected, or there should be some sort of lint for this. All three of these f-strings are invalid

f"{1!
r}"
f"{1! r}"
f"{1!\
r}"

And raise SyntaxError: f-string: conversion type must come right after the exclamanation mark, but it parses/formats with no complaints, even with all lints enabled playground link
(Also I already make a PR in CPython for the typo in the error)

Version

playground

[MeGaGiGaGon]

You can also use this fact to cause code changing formatting/comment deletion playground

f"{1! #test
r:}"
f"{1=! #test
r:}"

Formats to

f"{
    1!r:  # test
}"
f"{1=!r:}"

[ntBre]

Thanks! I'll add these to #17412

[ntBre]

Oh, these are actually reported by the parser, not the compiler. We can just track them here then.