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Remove From impls for unstable types that break inference

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Adding additional `From` implementations that fit `f32::from(<unaffixed
float>)` broke inference. Remove these for now.

Fixes: <https://github.com/rust-lang/rust/issues/123824>
This commit is contained in:
Trevor Gross 2024-04-11 18:01:26 -04:00
parent aa6a697a1c
commit 9bcc98818c
2 changed files with 11 additions and 2 deletions
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4
library/core/src/convert/num.rs
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@ -165,8 +165,8 @@ impl_from!(u16 => f64, #[stable(feature = "lossless_float_conv", since = "1.6.0"
impl_from!(u32 => f64, #[stable(feature = "lossless_float_conv", since = "1.6.0")]); impl_from!(u32 => f64, #[stable(feature = "lossless_float_conv", since = "1.6.0")]);
// float -> float // float -> float
impl_from!(f16 => f32, #[stable(feature = "lossless_float_conv", since = "1.6.0")]); // FIXME(f16_f128): adding additional `From` impls for existing types breaks inference. See
impl_from!(f16 => f64, #[stable(feature = "lossless_float_conv", since = "1.6.0")]); // <https://github.com/rust-lang/rust/issues/123824>
impl_from!(f16 => f128, #[stable(feature = "lossless_float_conv", since = "1.6.0")]); impl_from!(f16 => f128, #[stable(feature = "lossless_float_conv", since = "1.6.0")]);
impl_from!(f32 => f64, #[stable(feature = "lossless_float_conv", since = "1.6.0")]); impl_from!(f32 => f64, #[stable(feature = "lossless_float_conv", since = "1.6.0")]);
impl_from!(f32 => f128, #[stable(feature = "lossless_float_conv", since = "1.6.0")]); impl_from!(f32 => f128, #[stable(feature = "lossless_float_conv", since = "1.6.0")]);

9
tests/ui/inference/untyped-primitives.rs Normal file
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@ -0,0 +1,9 @@
//@ check-pass
// issue: rust-lang/rust#123824
// This test is a sanity check and does not enforce any stable API, so may be
// removed at a future point.
fn main() {
let x = f32::from(3.14);
let y = f64::from(3.14);
}