Matthias Bussonnier <[email protected]> added the comment:
Just for clarification for future readers;
I landed a PR that used f"{x=}" in some new functionalities, and that broke the
buildbots, the buildbots do test that many of the `Lib/` files can be
round-tripped ast->unparse->ast, and as ast-unparse did not understood f-debug,
if roundtripped f"{x=}" to f"{x!r}". The PRs CIs did not fail as apparently
they don't test this functionality.
So currently not having support for f-string-debug in ast-unparse kind of
prevent using f-string debug format in the stdlib.
I'm happy if `expr_text` get removed, and having unparse round-trip to
`x={x!r}` sounds sufficient to me; it may make like of formatters like black a
bit harder maybe ? Though I believe black is likely not using ast but lib2to3.
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