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Rollup merge of #120516 - Nadrieril:cleanup-impls, r=compiler-errors

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pattern_analysis: cleanup manual impls

https://github.com/rust-lang/rust/pull/120420 introduced some unneeded manual impls. I remove them here.

r? ```@Nilstrieb```
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Matthias Krüger 2024-02-03 22:25:14 +01:00 • committed by GitHub
commit f3ebf1e50f
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3 changed files with 4 additions and 91 deletions
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14
compiler/rustc_pattern_analysis/src/usefulness.rs
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@ -1207,6 +1207,7 @@ impl<'p, Cx: TypeCx> fmt::Debug for Matrix<'p, Cx> {
/// The final `Pair(Some(_), true)` is then the resulting witness.
///
/// See the top of the file for more detailed explanations and examples.
#[derive(Debug)]
struct WitnessStack<Cx: TypeCx>(Vec<WitnessPat<Cx>>);
impl<Cx: TypeCx> Clone for WitnessStack<Cx> {
@ -1215,12 +1216,6 @@ impl<Cx: TypeCx> Clone for WitnessStack<Cx> {
}
}
impl<Cx: TypeCx> fmt::Debug for WitnessStack<Cx> {
fn fmt(&self, fmt: &mut fmt::Formatter<'_>) -> fmt::Result {
fmt.debug_tuple("WitnessStack").field(&self.0).finish()
}
}
impl<Cx: TypeCx> WitnessStack<Cx> {
/// Asserts that the witness contains a single pattern, and returns it.
fn single_pattern(self) -> WitnessPat<Cx> {
@ -1265,6 +1260,7 @@ impl<Cx: TypeCx> WitnessStack<Cx> {
///
/// Just as the `Matrix` starts with a single column, by the end of the algorithm, this has a single
/// column, which contains the patterns that are missing for the match to be exhaustive.
#[derive(Debug)]
struct WitnessMatrix<Cx: TypeCx>(Vec<WitnessStack<Cx>>);
impl<Cx: TypeCx> Clone for WitnessMatrix<Cx> {
@ -1273,12 +1269,6 @@ impl<Cx: TypeCx> Clone for WitnessMatrix<Cx> {
}
}
impl<Cx: TypeCx> fmt::Debug for WitnessMatrix<Cx> {
fn fmt(&self, fmt: &mut fmt::Formatter<'_>) -> fmt::Result {
fmt.debug_tuple("WitnessMatrix").field(&self.0).finish()
}
}
impl<Cx: TypeCx> WitnessMatrix<Cx> {
/// New matrix with no witnesses.
fn empty() -> Self {