mirror of https://github.com/rust-lang/rust.git
Auto merge of #98655 - nnethercote:dont-derive-PartialEq-ne, r=dtolnay
Don't derive `PartialEq::ne`. Currently we skip deriving `PartialEq::ne` for C-like (fieldless) enums and empty structs, thus reyling on the default `ne`. This behaviour is unnecessarily conservative, because the `PartialEq` docs say this: > Implementations must ensure that eq and ne are consistent with each other: > > `a != b` if and only if `!(a == b)` (ensured by the default > implementation). This means that the default implementation (`!(a == b)`) is always good enough. So this commit changes things such that `ne` is never derived. The motivation for this change is that not deriving `ne` reduces compile times and binary sizes. Observable behaviour may change if a user has defined a type `A` with an inconsistent `PartialEq` and then defines a type `B` that contains an `A` and also derives `PartialEq`. Such code is already buggy and preserving bug-for-bug compatibility isn't necessary. Two side-effects of the change: - There is only one error message produced for types where `PartialEq` cannot be derived, instead of two. - For coverage reports, some warnings about generated `ne` methods not being executed have disappeared. Both side-effects seem fine, and possibly preferable.
This commit is contained in:
bors
commit
361c599fee
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@ -15,14 +15,8 @@ pub fn expand_deriving_partial_eq(
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item: &Annotatable,
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push: &mut dyn FnMut(Annotatable),
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) {
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fn cs_op(
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cx: &mut ExtCtxt<'_>,
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span: Span,
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substr: &Substructure<'_>,
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op: BinOpKind,
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combiner: BinOpKind,
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base: bool,
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) -> BlockOrExpr {
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fn cs_eq(cx: &mut ExtCtxt<'_>, span: Span, substr: &Substructure<'_>) -> BlockOrExpr {
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let base = true;
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let expr = cs_fold(
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true, // use foldl
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cx,
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@ -47,39 +41,22 @@ pub fn expand_deriving_partial_eq(
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cx.expr_deref(field.span, expr.clone())
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}
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};
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cx.expr_binary(field.span, op, convert(&field.self_expr), convert(other_expr))
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cx.expr_binary(
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field.span,
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BinOpKind::Eq,
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convert(&field.self_expr),
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convert(other_expr),
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)
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}
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CsFold::Combine(span, expr1, expr2) => {
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cx.expr_binary(span, BinOpKind::And, expr1, expr2)
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}
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CsFold::Combine(span, expr1, expr2) => cx.expr_binary(span, combiner, expr1, expr2),
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CsFold::Fieldless => cx.expr_bool(span, base),
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},
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);
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BlockOrExpr::new_expr(expr)
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}
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fn cs_eq(cx: &mut ExtCtxt<'_>, span: Span, substr: &Substructure<'_>) -> BlockOrExpr {
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cs_op(cx, span, substr, BinOpKind::Eq, BinOpKind::And, true)
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}
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fn cs_ne(cx: &mut ExtCtxt<'_>, span: Span, substr: &Substructure<'_>) -> BlockOrExpr {
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cs_op(cx, span, substr, BinOpKind::Ne, BinOpKind::Or, false)
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}
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macro_rules! md {
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($name:expr, $f:ident) => {{
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let inline = cx.meta_word(span, sym::inline);
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let attrs = vec![cx.attribute(inline)];
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MethodDef {
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name: $name,
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generics: Bounds::empty(),
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explicit_self: true,
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nonself_args: vec![(self_ref(), sym::other)],
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ret_ty: Path(path_local!(bool)),
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attributes: attrs,
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unify_fieldless_variants: true,
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combine_substructure: combine_substructure(Box::new(|a, b, c| $f(a, b, c))),
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}
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}};
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}
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super::inject_impl_of_structural_trait(
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cx,
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span,
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@ -88,13 +65,20 @@ pub fn expand_deriving_partial_eq(
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push,
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);
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// avoid defining `ne` if we can
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// c-like enums, enums without any fields and structs without fields
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// can safely define only `eq`.
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let mut methods = vec![md!(sym::eq, cs_eq)];
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if !is_type_without_fields(item) {
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methods.push(md!(sym::ne, cs_ne));
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}
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// No need to generate `ne`, the default suffices, and not generating it is
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// faster.
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let inline = cx.meta_word(span, sym::inline);
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let attrs = vec![cx.attribute(inline)];
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let methods = vec![MethodDef {
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name: sym::eq,
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generics: Bounds::empty(),
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explicit_self: true,
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nonself_args: vec![(self_ref(), sym::other)],
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ret_ty: Path(path_local!(bool)),
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attributes: attrs,
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unify_fieldless_variants: true,
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combine_substructure: combine_substructure(Box::new(|a, b, c| cs_eq(a, b, c))),
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}];
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let trait_def = TraitDef {
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span,
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|
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@ -1625,19 +1625,3 @@ where
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StaticEnum(..) | StaticStruct(..) => cx.span_bug(trait_span, "static function in `derive`"),
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}
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}
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/// Returns `true` if the type has no value fields
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/// (for an enum, no variant has any fields)
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pub fn is_type_without_fields(item: &Annotatable) -> bool {
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if let Annotatable::Item(ref item) = *item {
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match item.kind {
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ast::ItemKind::Enum(ref enum_def, _) => {
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enum_def.variants.iter().all(|v| v.data.fields().is_empty())
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}
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ast::ItemKind::Struct(ref variant_data, _) => variant_data.fields().is_empty(),
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_ => false,
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}
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} else {
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false
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}
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}
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|
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@ -38,8 +38,10 @@ use self::Ordering::*;
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///
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/// Implementations must ensure that `eq` and `ne` are consistent with each other:
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///
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/// - `a != b` if and only if `!(a == b)`
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/// (ensured by the default implementation).
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/// - `a != b` if and only if `!(a == b)`.
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///
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/// The default implementation of `ne` provides this consistency and is almost
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/// always sufficient. It should not be overridden without very good reason.
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///
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/// If [`PartialOrd`] or [`Ord`] are also implemented for `Self` and `Rhs`, their methods must also
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/// be consistent with `PartialEq` (see the documentation of those traits for the exact
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@ -225,7 +227,8 @@ pub trait PartialEq<Rhs: ?Sized = Self> {
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#[stable(feature = "rust1", since = "1.0.0")]
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fn eq(&self, other: &Rhs) -> bool;
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/// This method tests for `!=`.
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/// This method tests for `!=`. The default implementation is almost always
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/// sufficient, and should not be overridden without very good reason.
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#[inline]
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#[must_use]
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#[stable(feature = "rust1", since = "1.0.0")]
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|
|
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@ -23,12 +23,6 @@
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22| 1|//! ```
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23| 2|//! #[derive(Debug, PartialEq)]
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^1
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------------------
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| Unexecuted instantiation: <rust_out::main::_doctest_main____coverage_doctest_rs_22_0::SomeError as core::cmp::PartialEq>::ne
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------------------
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| <rust_out::main::_doctest_main____coverage_doctest_rs_22_0::SomeError as core::cmp::PartialEq>::eq:
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| 23| 2|//! #[derive(Debug, PartialEq)]
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------------------
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24| 1|//! struct SomeError {
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25| 1|//! msg: String,
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26| 1|//! }
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|
|
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@ -2,12 +2,6 @@
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2| |
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3| 3|#[derive(Debug, PartialEq, Eq)]
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^2
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------------------
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| <issue_83601::Foo as core::cmp::PartialEq>::eq:
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| 3| 2|#[derive(Debug, PartialEq, Eq)]
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------------------
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| Unexecuted instantiation: <issue_83601::Foo as core::cmp::PartialEq>::ne
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------------------
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4| |struct Foo(u32);
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5| |
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6| 1|fn main() {
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|
|
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@ -2,12 +2,6 @@
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2| |
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3| |// expect-exit-status-101
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4| 21|#[derive(PartialEq, Eq)]
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------------------
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| <issue_84561::Foo as core::cmp::PartialEq>::eq:
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| 4| 21|#[derive(PartialEq, Eq)]
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------------------
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| Unexecuted instantiation: <issue_84561::Foo as core::cmp::PartialEq>::ne
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------------------
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5| |struct Foo(u32);
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6| 1|fn test3() {
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7| 1| let is_true = std::env::args().len() == 1;
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|
|
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@ -3,11 +3,6 @@
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3| |
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4| 2|#[derive(Clone, Debug, PartialEq, Eq, PartialOrd, Ord)]
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^0 ^0 ^0 ^1 ^1 ^0^0
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------------------
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| Unexecuted instantiation: <partial_eq::Version as core::cmp::PartialEq>::ne
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------------------
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| Unexecuted instantiation: <partial_eq::Version as core::cmp::PartialEq>::eq
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------------------
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5| |pub struct Version {
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6| | major: usize,
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7| | minor: usize,
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|
|
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@ -7,7 +7,6 @@ struct Error;
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enum Enum {
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A {
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x: Error //~ ERROR
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//~^ ERROR
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}
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}
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|
|
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@ -18,26 +18,6 @@ help: consider annotating `Error` with `#[derive(PartialEq)]`
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LL | #[derive(PartialEq)]
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|
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error[E0369]: binary operation `!=` cannot be applied to type `Error`
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--> $DIR/derives-span-PartialEq-enum-struct-variant.rs:9:6
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|
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LL | #[derive(PartialEq)]
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| --------- in this derive macro expansion
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...
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LL | x: Error
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| ^^^^^^^^
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|
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note: an implementation of `PartialEq<_>` might be missing for `Error`
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--> $DIR/derives-span-PartialEq-enum-struct-variant.rs:4:1
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|
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LL | struct Error;
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| ^^^^^^^^^^^^ must implement `PartialEq<_>`
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= note: this error originates in the derive macro `PartialEq` (in Nightly builds, run with -Z macro-backtrace for more info)
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help: consider annotating `Error` with `#[derive(PartialEq)]`
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|
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LL | #[derive(PartialEq)]
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|
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error: aborting due to 2 previous errors
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error: aborting due to previous error
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For more information about this error, try `rustc --explain E0369`.
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|
|
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@ -7,8 +7,7 @@ struct Error;
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enum Enum {
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A(
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Error //~ ERROR
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//~^ ERROR
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)
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)
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}
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fn main() {}
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|
|
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@ -18,26 +18,6 @@ help: consider annotating `Error` with `#[derive(PartialEq)]`
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LL | #[derive(PartialEq)]
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|
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error[E0369]: binary operation `!=` cannot be applied to type `Error`
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--> $DIR/derives-span-PartialEq-enum.rs:9:6
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|
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LL | #[derive(PartialEq)]
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| --------- in this derive macro expansion
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...
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LL | Error
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| ^^^^^
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|
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note: an implementation of `PartialEq<_>` might be missing for `Error`
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--> $DIR/derives-span-PartialEq-enum.rs:4:1
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|
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LL | struct Error;
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| ^^^^^^^^^^^^ must implement `PartialEq<_>`
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= note: this error originates in the derive macro `PartialEq` (in Nightly builds, run with -Z macro-backtrace for more info)
|
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help: consider annotating `Error` with `#[derive(PartialEq)]`
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|
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LL | #[derive(PartialEq)]
|
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|
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|
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error: aborting due to 2 previous errors
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error: aborting due to previous error
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|
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For more information about this error, try `rustc --explain E0369`.
|
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|
|
|
|||
|
|
@ -6,7 +6,6 @@ struct Error;
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#[derive(PartialEq)]
|
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struct Struct {
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x: Error //~ ERROR
|
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//~^ ERROR
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}
|
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|
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fn main() {}
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|
|
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|
|
@ -18,26 +18,6 @@ help: consider annotating `Error` with `#[derive(PartialEq)]`
|
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LL | #[derive(PartialEq)]
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|
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|
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error[E0369]: binary operation `!=` cannot be applied to type `Error`
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--> $DIR/derives-span-PartialEq-struct.rs:8:5
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|
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LL | #[derive(PartialEq)]
|
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| --------- in this derive macro expansion
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LL | struct Struct {
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LL | x: Error
|
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| ^^^^^^^^
|
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|
|
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note: an implementation of `PartialEq<_>` might be missing for `Error`
|
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--> $DIR/derives-span-PartialEq-struct.rs:4:1
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|
|
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LL | struct Error;
|
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| ^^^^^^^^^^^^ must implement `PartialEq<_>`
|
||||
= note: this error originates in the derive macro `PartialEq` (in Nightly builds, run with -Z macro-backtrace for more info)
|
||||
help: consider annotating `Error` with `#[derive(PartialEq)]`
|
||||
|
|
||||
LL | #[derive(PartialEq)]
|
||||
|
|
||||
|
||||
error: aborting due to 2 previous errors
|
||||
error: aborting due to previous error
|
||||
|
||||
For more information about this error, try `rustc --explain E0369`.
|
||||
|
|
|
|||
|
|
@ -6,7 +6,6 @@ struct Error;
|
|||
#[derive(PartialEq)]
|
||||
struct Struct(
|
||||
Error //~ ERROR
|
||||
//~^ ERROR
|
||||
);
|
||||
|
||||
fn main() {}
|
||||
|
|
|
|||
|
|
@ -18,26 +18,6 @@ help: consider annotating `Error` with `#[derive(PartialEq)]`
|
|||
LL | #[derive(PartialEq)]
|
||||
|
|
||||
|
||||
error[E0369]: binary operation `!=` cannot be applied to type `Error`
|
||||
--> $DIR/derives-span-PartialEq-tuple-struct.rs:8:5
|
||||
|
|
||||
LL | #[derive(PartialEq)]
|
||||
| --------- in this derive macro expansion
|
||||
LL | struct Struct(
|
||||
LL | Error
|
||||
| ^^^^^
|
||||
|
|
||||
note: an implementation of `PartialEq<_>` might be missing for `Error`
|
||||
--> $DIR/derives-span-PartialEq-tuple-struct.rs:4:1
|
||||
|
|
||||
LL | struct Error;
|
||||
| ^^^^^^^^^^^^ must implement `PartialEq<_>`
|
||||
= note: this error originates in the derive macro `PartialEq` (in Nightly builds, run with -Z macro-backtrace for more info)
|
||||
help: consider annotating `Error` with `#[derive(PartialEq)]`
|
||||
|
|
||||
LL | #[derive(PartialEq)]
|
||||
|
|
||||
|
||||
error: aborting due to 2 previous errors
|
||||
error: aborting due to previous error
|
||||
|
||||
For more information about this error, try `rustc --explain E0369`.
|
||||
|
|
|
|||
|
|
@ -3,7 +3,6 @@ struct NoCloneOrEq;
|
|||
#[derive(PartialEq)]
|
||||
struct E {
|
||||
x: NoCloneOrEq //~ ERROR binary operation `==` cannot be applied to type `NoCloneOrEq`
|
||||
//~^ ERROR binary operation `!=` cannot be applied to type `NoCloneOrEq`
|
||||
}
|
||||
#[derive(Clone)]
|
||||
struct C {
|
||||
|
|
|
|||
|
|
@ -18,28 +18,8 @@ help: consider annotating `NoCloneOrEq` with `#[derive(PartialEq)]`
|
|||
LL | #[derive(PartialEq)]
|
||||
|
|
||||
|
||||
error[E0369]: binary operation `!=` cannot be applied to type `NoCloneOrEq`
|
||||
--> $DIR/deriving-no-inner-impl-error-message.rs:5:5
|
||||
|
|
||||
LL | #[derive(PartialEq)]
|
||||
| --------- in this derive macro expansion
|
||||
LL | struct E {
|
||||
LL | x: NoCloneOrEq
|
||||
| ^^^^^^^^^^^^^^
|
||||
|
|
||||
note: an implementation of `PartialEq<_>` might be missing for `NoCloneOrEq`
|
||||
--> $DIR/deriving-no-inner-impl-error-message.rs:1:1
|
||||
|
|
||||
LL | struct NoCloneOrEq;
|
||||
| ^^^^^^^^^^^^^^^^^^ must implement `PartialEq<_>`
|
||||
= note: this error originates in the derive macro `PartialEq` (in Nightly builds, run with -Z macro-backtrace for more info)
|
||||
help: consider annotating `NoCloneOrEq` with `#[derive(PartialEq)]`
|
||||
|
|
||||
LL | #[derive(PartialEq)]
|
||||
|
|
||||
|
||||
error[E0277]: the trait bound `NoCloneOrEq: Clone` is not satisfied
|
||||
--> $DIR/deriving-no-inner-impl-error-message.rs:10:5
|
||||
--> $DIR/deriving-no-inner-impl-error-message.rs:9:5
|
||||
|
|
||||
LL | #[derive(Clone)]
|
||||
| ----- in this derive macro expansion
|
||||
|
|
@ -53,7 +33,7 @@ help: consider annotating `NoCloneOrEq` with `#[derive(Clone)]`
|
|||
LL | #[derive(Clone)]
|
||||
|
|
||||
|
||||
error: aborting due to 3 previous errors
|
||||
error: aborting due to 2 previous errors
|
||||
|
||||
Some errors have detailed explanations: E0277, E0369.
|
||||
For more information about an error, try `rustc --explain E0277`.
|
||||
|
|
|
|||
|
|
@ -122,10 +122,6 @@ impl ::core::cmp::PartialEq for Point {
|
|||
fn eq(&self, other: &Point) -> bool {
|
||||
self.x == other.x && self.y == other.y
|
||||
}
|
||||
#[inline]
|
||||
fn ne(&self, other: &Point) -> bool {
|
||||
self.x != other.x || self.y != other.y
|
||||
}
|
||||
}
|
||||
impl ::core::marker::StructuralEq for Point {}
|
||||
#[automatically_derived]
|
||||
|
|
@ -239,13 +235,6 @@ impl ::core::cmp::PartialEq for Big {
|
|||
self.b6 == other.b6 && self.b7 == other.b7 &&
|
||||
self.b8 == other.b8
|
||||
}
|
||||
#[inline]
|
||||
fn ne(&self, other: &Big) -> bool {
|
||||
self.b1 != other.b1 || self.b2 != other.b2 || self.b3 != other.b3 ||
|
||||
self.b4 != other.b4 || self.b5 != other.b5 ||
|
||||
self.b6 != other.b6 || self.b7 != other.b7 ||
|
||||
self.b8 != other.b8
|
||||
}
|
||||
}
|
||||
impl ::core::marker::StructuralEq for Big {}
|
||||
#[automatically_derived]
|
||||
|
|
@ -361,8 +350,6 @@ impl ::core::marker::StructuralPartialEq for Unsized {}
|
|||
impl ::core::cmp::PartialEq for Unsized {
|
||||
#[inline]
|
||||
fn eq(&self, other: &Unsized) -> bool { self.0 == other.0 }
|
||||
#[inline]
|
||||
fn ne(&self, other: &Unsized) -> bool { self.0 != other.0 }
|
||||
}
|
||||
impl ::core::marker::StructuralEq for Unsized {}
|
||||
#[automatically_derived]
|
||||
|
|
@ -428,8 +415,6 @@ impl ::core::marker::StructuralPartialEq for PackedCopy {}
|
|||
impl ::core::cmp::PartialEq for PackedCopy {
|
||||
#[inline]
|
||||
fn eq(&self, other: &PackedCopy) -> bool { { self.0 } == { other.0 } }
|
||||
#[inline]
|
||||
fn ne(&self, other: &PackedCopy) -> bool { { self.0 } != { other.0 } }
|
||||
}
|
||||
impl ::core::marker::StructuralEq for PackedCopy {}
|
||||
#[automatically_derived]
|
||||
|
|
@ -503,12 +488,6 @@ impl ::core::cmp::PartialEq for PackedNonCopy {
|
|||
let Self(ref __self_1_0) = *other;
|
||||
*__self_0_0 == *__self_1_0
|
||||
}
|
||||
#[inline]
|
||||
fn ne(&self, other: &PackedNonCopy) -> bool {
|
||||
let Self(ref __self_0_0) = *self;
|
||||
let Self(ref __self_1_0) = *other;
|
||||
*__self_0_0 != *__self_1_0
|
||||
}
|
||||
}
|
||||
impl ::core::marker::StructuralEq for PackedNonCopy {}
|
||||
#[automatically_derived]
|
||||
|
|
@ -638,13 +617,6 @@ impl ::core::cmp::PartialEq for Enum1 {
|
|||
*__self_0 == *__arg1_0,
|
||||
}
|
||||
}
|
||||
#[inline]
|
||||
fn ne(&self, other: &Enum1) -> bool {
|
||||
match (self, other) {
|
||||
(Enum1::Single { x: __self_0 }, Enum1::Single { x: __arg1_0 }) =>
|
||||
*__self_0 != *__arg1_0,
|
||||
}
|
||||
}
|
||||
}
|
||||
impl ::core::marker::StructuralEq for Enum1 {}
|
||||
#[automatically_derived]
|
||||
|
|
@ -883,20 +855,6 @@ impl ::core::cmp::PartialEq for Mixed {
|
|||
_ => true,
|
||||
}
|
||||
}
|
||||
#[inline]
|
||||
fn ne(&self, other: &Mixed) -> bool {
|
||||
let __self_tag = ::core::intrinsics::discriminant_value(self);
|
||||
let __arg1_tag = ::core::intrinsics::discriminant_value(other);
|
||||
__self_tag != __arg1_tag ||
|
||||
match (self, other) {
|
||||
(Mixed::R(__self_0), Mixed::R(__arg1_0)) =>
|
||||
*__self_0 != *__arg1_0,
|
||||
(Mixed::S { d1: __self_0, d2: __self_1 }, Mixed::S {
|
||||
d1: __arg1_0, d2: __arg1_1 }) =>
|
||||
*__self_0 != *__arg1_0 || *__self_1 != *__arg1_1,
|
||||
_ => false,
|
||||
}
|
||||
}
|
||||
}
|
||||
impl ::core::marker::StructuralEq for Mixed {}
|
||||
#[automatically_derived]
|
||||
|
|
@ -1023,21 +981,6 @@ impl ::core::cmp::PartialEq for Fielded {
|
|||
_ => unsafe { ::core::intrinsics::unreachable() }
|
||||
}
|
||||
}
|
||||
#[inline]
|
||||
fn ne(&self, other: &Fielded) -> bool {
|
||||
let __self_tag = ::core::intrinsics::discriminant_value(self);
|
||||
let __arg1_tag = ::core::intrinsics::discriminant_value(other);
|
||||
__self_tag != __arg1_tag ||
|
||||
match (self, other) {
|
||||
(Fielded::X(__self_0), Fielded::X(__arg1_0)) =>
|
||||
*__self_0 != *__arg1_0,
|
||||
(Fielded::Y(__self_0), Fielded::Y(__arg1_0)) =>
|
||||
*__self_0 != *__arg1_0,
|
||||
(Fielded::Z(__self_0), Fielded::Z(__arg1_0)) =>
|
||||
*__self_0 != *__arg1_0,
|
||||
_ => unsafe { ::core::intrinsics::unreachable() }
|
||||
}
|
||||
}
|
||||
}
|
||||
impl ::core::marker::StructuralEq for Fielded {}
|
||||
#[automatically_derived]
|
||||
|
|
|
|||
Loading…
Reference in New Issue