allow path in from_py_with and deprecate string literal
#4860
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Icxolu
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davidhewitt
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| quote_spanned! { expr_path.span() => | ||
| #[deprecated(since = "0.24.0", note = "`from_py_with` string literals are deprecated. Use the function path instead.")] | ||
| #[allow(dead_code)] | ||
| const LIT_STR_DEPRECATION: () = (); | ||
| let _: () = LIT_STR_DEPRECATION; | ||
| } |
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To avoid repetition, shall we put a helper function somewhere to produce these fragments?
Also, I wonder if we should be more direct with the hint to users. E.g.
= help: use `foo` instead of `"foo"`
(we could even substitute in the user input)
or maybe
remove the quotes from the literal
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Good idea! I made a small helper in utils and changed the deprecation message, let me know what you think
| warning: use of deprecated constant `__pyfunction_f::LIT_STR_DEPRECATION`: `from_py_with` string literals is deprecated. Use the function path instead. | ||
| --> tests/ui/invalid_argument_attributes.rs:23:28 | ||
| | | ||
| 23 | fn f(#[pyo3(from_py_with = "bytes_from_py")] _bytes: Vec<u8>) {} |
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so e.g. maybe here it says
use `bytes_from_py` instead of `"bytes_from_py"`
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davidhewitt
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Mar 1, 2025
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This allows specifying the
from_py_withfunction as a path rather than a string literal. The old syntax is still valid and shows a deprecation warning.Complementary to #4850.