Rollup merge of #131381 - Nadrieril:min-match-ergonomics, r=pnkfelix
Implement edition 2024 match ergonomics restrictions This implements the minimalest version of [match ergonomics for edition 2024](https://rust-lang.github.io/rfcs/3627-match-ergonomics-2024.html). This minimal version makes it an error to ever reset the default binding mode. The implemented proposal is described precisely [here](https://hackmd.io/zUqs2ISNQ0Wrnxsa9nhD0Q#RFC-3627-nano), where it is called "RFC 3627-nano". Rules: - Rule 1C: When the DBM (default binding mode) is not `move` (whether or not behind a reference), writing `mut`, `ref`, or `ref mut` on a binding is an error. - Rule 2C: Reference patterns can only match against references in the scrutinee when the DBM is `move`. This minimal version is forward-compatible with the main proposals for match ergonomics 2024: [RFC3627](https://rust-lang.github.io/rfcs/3627-match-ergonomics-2024.html) itself, the alternative [rule 4-early variant](https://rust-lang.github.io/rfcs/3627-match-ergonomics-2024.html), and [others](https://hackmd.io/zUqs2ISNQ0Wrnxsa9nhD0Q). The idea is to give us more time to iron out a final proposal. This includes a migration lint that desugars any offending pattern into one that doesn't make use of match ergonomics. Such patterns have identical meaning across editions. This PR insta-stabilizes the proposed behavior onto edition 2024. r? `@ghost` Tracking: - https://github.com/rust-lang/rust/issues/123076
This commit is contained in:
Matthias Krüger
GitHub
commit
c1ed1f133e
@ -690,16 +690,29 @@ fn check_pat_ident(
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BindingMode(def_br, Mutability::Mut)
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} else {
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// `mut` resets binding mode on edition <= 2021
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self.typeck_results
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// `mut` resets the binding mode on edition <= 2021
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*self
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.typeck_results
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.borrow_mut()
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.rust_2024_migration_desugared_pats_mut()
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.insert(pat_info.top_info.hir_id);
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.entry(pat_info.top_info.hir_id)
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.or_default() |= pat.span.at_least_rust_2024();
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BindingMode(ByRef::No, Mutability::Mut)
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}
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}
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BindingMode(ByRef::No, mutbl) => BindingMode(def_br, mutbl),
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BindingMode(ByRef::Yes(_), _) => user_bind_annot,
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BindingMode(ByRef::Yes(_), _) => {
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if matches!(def_br, ByRef::Yes(_)) {
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// `ref`/`ref mut` overrides the binding mode on edition <= 2021
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*self
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.typeck_results
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.borrow_mut()
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.rust_2024_migration_desugared_pats_mut()
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.entry(pat_info.top_info.hir_id)
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.or_default() |= pat.span.at_least_rust_2024();
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}
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user_bind_annot
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}
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};
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if bm.0 == ByRef::Yes(Mutability::Mut)
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@ -2204,14 +2217,14 @@ fn check_pat_ref(
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}
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} else {
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// Reset binding mode on old editions
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if pat_info.binding_mode != ByRef::No {
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pat_info.binding_mode = ByRef::No;
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self.typeck_results
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*self
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.typeck_results
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.borrow_mut()
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.rust_2024_migration_desugared_pats_mut()
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.insert(pat_info.top_info.hir_id);
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.entry(pat_info.top_info.hir_id)
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.or_default() |= pat.span.at_least_rust_2024();
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}
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}
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@ -2262,6 +2275,7 @@ fn check_pat_ref(
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(err, err)
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}
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};
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self.check_pat(inner, inner_ty, pat_info);
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ref_ty
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}
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@ -635,7 +635,7 @@ fn visit_adjustments(&mut self, span: Span, hir_id: HirId) {
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#[instrument(skip(self), level = "debug")]
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fn visit_rust_2024_migration_desugared_pats(&mut self, hir_id: hir::HirId) {
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if self
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if let Some(is_hard_error) = self
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.fcx
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.typeck_results
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.borrow_mut()
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@ -645,7 +645,9 @@ fn visit_rust_2024_migration_desugared_pats(&mut self, hir_id: hir::HirId) {
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debug!(
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"node is a pat whose match ergonomics are desugared by the Rust 2024 migration lint"
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);
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self.typeck_results.rust_2024_migration_desugared_pats_mut().insert(hir_id);
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self.typeck_results
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.rust_2024_migration_desugared_pats_mut()
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.insert(hir_id, is_hard_error);
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}
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}
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@ -1651,7 +1651,6 @@
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/// ### Example
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///
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/// ```rust,edition2021
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/// #![feature(ref_pat_eat_one_layer_2024)]
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/// #![warn(rust_2024_incompatible_pat)]
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///
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/// if let Some(&a) = &Some(&0u8) {
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@ -1672,12 +1671,10 @@
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pub RUST_2024_INCOMPATIBLE_PAT,
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Allow,
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"detects patterns whose meaning will change in Rust 2024",
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@feature_gate = ref_pat_eat_one_layer_2024;
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// FIXME uncomment below upon stabilization
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/*@future_incompatible = FutureIncompatibleInfo {
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@future_incompatible = FutureIncompatibleInfo {
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reason: FutureIncompatibilityReason::EditionSemanticsChange(Edition::Edition2024),
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reference: "123076",
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};*/
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};
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}
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declare_lint! {
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@ -73,9 +73,10 @@ pub struct TypeckResults<'tcx> {
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/// Stores the actual binding mode for all instances of [`BindingMode`].
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pat_binding_modes: ItemLocalMap<BindingMode>,
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/// Top-level patterns whose match ergonomics need to be desugared
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/// by the Rust 2021 -> 2024 migration lint.
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rust_2024_migration_desugared_pats: ItemLocalSet,
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/// Top-level patterns whose match ergonomics need to be desugared by the Rust 2021 -> 2024
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/// migration lint. The boolean indicates whether the emitted diagnostic should be a hard error
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/// (if any of the incompatible pattern elements are in edition 2024).
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rust_2024_migration_desugared_pats: ItemLocalMap<bool>,
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/// Stores the types which were implicitly dereferenced in pattern binding modes
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/// for later usage in THIR lowering. For example,
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@ -418,15 +419,15 @@ pub fn pat_adjustments_mut(&mut self) -> LocalTableInContextMut<'_, Vec<Ty<'tcx>
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LocalTableInContextMut { hir_owner: self.hir_owner, data: &mut self.pat_adjustments }
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}
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pub fn rust_2024_migration_desugared_pats(&self) -> LocalSetInContext<'_> {
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LocalSetInContext {
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pub fn rust_2024_migration_desugared_pats(&self) -> LocalTableInContext<'_, bool> {
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LocalTableInContext {
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hir_owner: self.hir_owner,
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data: &self.rust_2024_migration_desugared_pats,
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}
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}
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pub fn rust_2024_migration_desugared_pats_mut(&mut self) -> LocalSetInContextMut<'_> {
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LocalSetInContextMut {
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pub fn rust_2024_migration_desugared_pats_mut(&mut self) -> LocalTableInContextMut<'_, bool> {
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LocalTableInContextMut {
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hir_owner: self.hir_owner,
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data: &mut self.rust_2024_migration_desugared_pats,
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}
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@ -265,7 +265,7 @@ mir_build_pointer_pattern = function pointers and raw pointers not derived from
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mir_build_privately_uninhabited = pattern `{$witness_1}` is currently uninhabited, but this variant contains private fields which may become inhabited in the future
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mir_build_rust_2024_incompatible_pat = the semantics of this pattern will change in edition 2024
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mir_build_rust_2024_incompatible_pat = patterns are not allowed to reset the default binding mode in edition 2024
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mir_build_rustc_box_attribute_error = `#[rustc_box]` attribute used incorrectly
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.attributes = no other attributes may be applied
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@ -983,6 +983,8 @@ pub(crate) struct Rust2024IncompatiblePat {
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pub(crate) struct Rust2024IncompatiblePatSugg {
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pub(crate) suggestion: Vec<(Span, String)>,
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/// Whether the incompatibility is a hard error because a relevant span is in edition 2024.
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pub(crate) is_hard_error: bool,
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}
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impl Subdiagnostic for Rust2024IncompatiblePatSugg {
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@ -25,6 +25,7 @@
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pub(crate) use self::check_match::check_match;
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use crate::errors::*;
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use crate::fluent_generated as fluent;
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use crate::thir::util::UserAnnotatedTyHelpers;
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struct PatCtxt<'a, 'tcx> {
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@ -48,18 +49,28 @@ pub(super) fn pat_from_hir<'a, 'tcx>(
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typeck_results,
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rust_2024_migration_suggestion: typeck_results
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.rust_2024_migration_desugared_pats()
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.contains(pat.hir_id)
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.then_some(Rust2024IncompatiblePatSugg { suggestion: Vec::new() }),
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.get(pat.hir_id)
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.map(|&is_hard_error| Rust2024IncompatiblePatSugg {
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suggestion: Vec::new(),
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is_hard_error,
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}),
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};
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let result = pcx.lower_pattern(pat);
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debug!("pat_from_hir({:?}) = {:?}", pat, result);
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if let Some(sugg) = pcx.rust_2024_migration_suggestion {
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tcx.emit_node_span_lint(
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lint::builtin::RUST_2024_INCOMPATIBLE_PAT,
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pat.hir_id,
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pat.span,
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Rust2024IncompatiblePat { sugg },
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);
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if sugg.is_hard_error {
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let mut err =
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tcx.dcx().struct_span_err(pat.span, fluent::mir_build_rust_2024_incompatible_pat);
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err.subdiagnostic(sugg);
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err.emit();
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} else {
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tcx.emit_node_span_lint(
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lint::builtin::RUST_2024_INCOMPATIBLE_PAT,
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pat.hir_id,
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pat.span,
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Rust2024IncompatiblePat { sugg },
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);
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}
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}
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result
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}
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@ -1,57 +0,0 @@
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//@ edition: 2021
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//@ run-rustfix
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//@ rustfix-only-machine-applicable
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//@ aux-build:match_ergonomics_2024_macros.rs
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#![feature(mut_ref, ref_pat_eat_one_layer_2024)]
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#![allow(incomplete_features, unused)]
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#![deny(rust_2024_incompatible_pat)]
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extern crate match_ergonomics_2024_macros;
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struct Foo(u8);
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fn main() {
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let &Foo(mut a) = &Foo(0);
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//~^ ERROR: the semantics of this pattern will change in edition 2024
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a = 42;
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let &mut Foo(mut a) = &mut Foo(0);
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//~^ ERROR: the semantics of this pattern will change in edition 2024
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a = 42;
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if let &&&&&Some(&_) = &&&&&Some(&0u8) {}
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//~^ ERROR: the semantics of this pattern will change in edition 2024
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if let &&&&&Some(&mut _) = &&&&&Some(&mut 0u8) {}
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//~^ ERROR: the semantics of this pattern will change in edition 2024
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if let &&&&&mut Some(&_) = &&&&&mut Some(&0u8) {}
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//~^ ERROR: the semantics of this pattern will change in edition 2024
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if let &mut Some(&mut Some(&mut Some(_))) = &mut Some(&mut Some(&mut Some(0u8))) {}
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//~^ ERROR: the semantics of this pattern will change in edition 2024
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if let &mut Some(&mut Some(&mut Some(ref mut _a))) = &mut Some(&mut Some(&mut Some(0u8))) {}
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//~^ ERROR: the semantics of this pattern will change in edition 2024
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struct Struct {
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a: u32,
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b: u32,
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c: u32,
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}
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let s = Struct { a: 0, b: 0, c: 0 };
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let &Struct { ref a, mut b, ref c } = &s;
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//~^ ERROR: the semantics of this pattern will change in edition 2024
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#[warn(rust_2024_incompatible_pat)]
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match &(Some(0), Some(0)) {
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// The two patterns are the same syntactically, but because they're defined in different
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// editions they don't mean the same thing.
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(Some(mut _x), match_ergonomics_2024_macros::mixed_edition_pat!(_y)) => {
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//~^ WARN: the semantics of this pattern will change in edition 2024
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_x = 4;
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_y = &7;
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}
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_ => {}
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}
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}
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@ -1,57 +0,0 @@
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//@ edition: 2021
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//@ run-rustfix
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//@ rustfix-only-machine-applicable
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//@ aux-build:match_ergonomics_2024_macros.rs
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#![feature(mut_ref, ref_pat_eat_one_layer_2024)]
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#![allow(incomplete_features, unused)]
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#![deny(rust_2024_incompatible_pat)]
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extern crate match_ergonomics_2024_macros;
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struct Foo(u8);
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fn main() {
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let Foo(mut a) = &Foo(0);
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//~^ ERROR: the semantics of this pattern will change in edition 2024
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a = 42;
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let Foo(mut a) = &mut Foo(0);
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//~^ ERROR: the semantics of this pattern will change in edition 2024
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a = 42;
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if let Some(&_) = &&&&&Some(&0u8) {}
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//~^ ERROR: the semantics of this pattern will change in edition 2024
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if let Some(&mut _) = &&&&&Some(&mut 0u8) {}
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//~^ ERROR: the semantics of this pattern will change in edition 2024
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if let Some(&_) = &&&&&mut Some(&0u8) {}
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//~^ ERROR: the semantics of this pattern will change in edition 2024
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if let Some(&mut Some(Some(_))) = &mut Some(&mut Some(&mut Some(0u8))) {}
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//~^ ERROR: the semantics of this pattern will change in edition 2024
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if let Some(&mut Some(Some(_a))) = &mut Some(&mut Some(&mut Some(0u8))) {}
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//~^ ERROR: the semantics of this pattern will change in edition 2024
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struct Struct {
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a: u32,
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b: u32,
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c: u32,
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}
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let s = Struct { a: 0, b: 0, c: 0 };
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let Struct { a, mut b, c } = &s;
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//~^ ERROR: the semantics of this pattern will change in edition 2024
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#[warn(rust_2024_incompatible_pat)]
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match &(Some(0), Some(0)) {
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// The two patterns are the same syntactically, but because they're defined in different
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// editions they don't mean the same thing.
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(Some(mut _x), match_ergonomics_2024_macros::mixed_edition_pat!(_y)) => {
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//~^ WARN: the semantics of this pattern will change in edition 2024
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_x = 4;
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_y = &7;
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}
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_ => {}
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}
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}
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@ -1,97 +0,0 @@
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error: the semantics of this pattern will change in edition 2024
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--> $DIR/match_ergonomics_2024.rs:14:9
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|
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LL | let Foo(mut a) = &Foo(0);
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| -^^^^^^^^^
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| |
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| help: desugar the match ergonomics: `&`
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|
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note: the lint level is defined here
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--> $DIR/match_ergonomics_2024.rs:7:9
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|
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LL | #![deny(rust_2024_incompatible_pat)]
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| ^^^^^^^^^^^^^^^^^^^^^^^^^^
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error: the semantics of this pattern will change in edition 2024
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--> $DIR/match_ergonomics_2024.rs:18:9
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|
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LL | let Foo(mut a) = &mut Foo(0);
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| -^^^^^^^^^
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| |
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| help: desugar the match ergonomics: `&mut`
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error: the semantics of this pattern will change in edition 2024
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--> $DIR/match_ergonomics_2024.rs:22:12
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|
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LL | if let Some(&_) = &&&&&Some(&0u8) {}
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| -^^^^^^^
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| |
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| help: desugar the match ergonomics: `&&&&&`
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error: the semantics of this pattern will change in edition 2024
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--> $DIR/match_ergonomics_2024.rs:25:12
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|
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LL | if let Some(&mut _) = &&&&&Some(&mut 0u8) {}
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| -^^^^^^^^^^^
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| |
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| help: desugar the match ergonomics: `&&&&&`
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error: the semantics of this pattern will change in edition 2024
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--> $DIR/match_ergonomics_2024.rs:28:12
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|
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LL | if let Some(&_) = &&&&&mut Some(&0u8) {}
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| -^^^^^^^
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| |
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| help: desugar the match ergonomics: `&&&&&mut`
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error: the semantics of this pattern will change in edition 2024
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--> $DIR/match_ergonomics_2024.rs:31:12
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|
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LL | if let Some(&mut Some(Some(_))) = &mut Some(&mut Some(&mut Some(0u8))) {}
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| ^^^^^^^^^^^^^^^^^^^^^^^^
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|
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help: desugar the match ergonomics
|
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|
|
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LL | if let &mut Some(&mut Some(&mut Some(_))) = &mut Some(&mut Some(&mut Some(0u8))) {}
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| ++++ ++++
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||||
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error: the semantics of this pattern will change in edition 2024
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--> $DIR/match_ergonomics_2024.rs:34:12
|
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|
|
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LL | if let Some(&mut Some(Some(_a))) = &mut Some(&mut Some(&mut Some(0u8))) {}
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| ^^^^^^^^^^^^^^^^^^^^^^^^^
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|
|
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help: desugar the match ergonomics
|
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|
|
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LL | if let &mut Some(&mut Some(&mut Some(ref mut _a))) = &mut Some(&mut Some(&mut Some(0u8))) {}
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| ++++ ++++ +++++++
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error: the semantics of this pattern will change in edition 2024
|
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--> $DIR/match_ergonomics_2024.rs:43:9
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|
|
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LL | let Struct { a, mut b, c } = &s;
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| ^^^^^^^^^^^^^^^^^^^^^^
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||||
|
|
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help: desugar the match ergonomics
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|
|
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LL | let &Struct { ref a, mut b, ref c } = &s;
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| + +++ +++
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warning: the semantics of this pattern will change in edition 2024
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--> $DIR/match_ergonomics_2024.rs:50:9
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|
|
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LL | (Some(mut _x), match_ergonomics_2024_macros::mixed_edition_pat!(_y)) => {
|
||||
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
|
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|
|
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note: the lint level is defined here
|
||||
--> $DIR/match_ergonomics_2024.rs:46:12
|
||||
|
|
||||
LL | #[warn(rust_2024_incompatible_pat)]
|
||||
| ^^^^^^^^^^^^^^^^^^^^^^^^^^
|
||||
help: desugar the match ergonomics
|
||||
|
|
||||
LL | &(Some(mut _x), match_ergonomics_2024_macros::mixed_edition_pat!(ref _y)) => {
|
||||
| + +++
|
||||
|
||||
error: aborting due to 8 previous errors; 1 warning emitted
|
||||
|
||||
@ -0,0 +1,144 @@
|
||||
//@ edition: 2021
|
||||
//@ run-rustfix
|
||||
//@ rustfix-only-machine-applicable
|
||||
//@ aux-build:migration_lint_macros.rs
|
||||
#![feature(mut_ref)]
|
||||
#![allow(incomplete_features, unused)]
|
||||
#![deny(rust_2024_incompatible_pat)]
|
||||
|
||||
extern crate migration_lint_macros;
|
||||
|
||||
struct Foo<T>(T);
|
||||
|
||||
// Tests type equality in a way that avoids coercing `&&T` to `&T`.
|
||||
trait Eq<T> {}
|
||||
impl<T> Eq<T> for T {}
|
||||
fn assert_type_eq<T, U: Eq<T>>(_: T, _: U) {}
|
||||
|
||||
fn main() {
|
||||
let Foo(x) = &Foo(0);
|
||||
assert_type_eq(x, &0u8);
|
||||
|
||||
let Foo(x) = &mut Foo(0);
|
||||
assert_type_eq(x, &mut 0u8);
|
||||
|
||||
let &Foo(mut x) = &Foo(0);
|
||||
//~^ ERROR: patterns are not allowed to reset the default binding mode
|
||||
//~| WARN: this changes meaning in Rust 2024
|
||||
assert_type_eq(x, 0u8);
|
||||
|
||||
let &mut Foo(mut x) = &mut Foo(0);
|
||||
//~^ ERROR: patterns are not allowed to reset the default binding mode
|
||||
//~| WARN: this changes meaning in Rust 2024
|
||||
assert_type_eq(x, 0u8);
|
||||
|
||||
let &Foo(ref x) = &Foo(0);
|
||||
//~^ ERROR: patterns are not allowed to reset the default binding mode
|
||||
//~| WARN: this changes meaning in Rust 2024
|
||||
assert_type_eq(x, &0u8);
|
||||
|
||||
let &mut Foo(ref x) = &mut Foo(0);
|
||||
//~^ ERROR: patterns are not allowed to reset the default binding mode
|
||||
//~| WARN: this changes meaning in Rust 2024
|
||||
assert_type_eq(x, &0u8);
|
||||
|
||||
let &Foo(x) = &Foo(0);
|
||||
assert_type_eq(x, 0u8);
|
||||
|
||||
let &mut Foo(x) = &mut Foo(0);
|
||||
assert_type_eq(x, 0u8);
|
||||
|
||||
let &Foo(x) = &Foo(&0);
|
||||
assert_type_eq(x, &0u8);
|
||||
|
||||
let &mut Foo(x) = &mut Foo(&0);
|
||||
assert_type_eq(x, &0u8);
|
||||
|
||||
let &Foo(&x) = &Foo(&0);
|
||||
//~^ ERROR: patterns are not allowed to reset the default binding mode
|
||||
//~| WARN: this changes meaning in Rust 2024
|
||||
assert_type_eq(x, 0u8);
|
||||
|
||||
let &Foo(&mut x) = &Foo(&mut 0);
|
||||
//~^ ERROR: patterns are not allowed to reset the default binding mode
|
||||
//~| WARN: this changes meaning in Rust 2024
|
||||
assert_type_eq(x, 0u8);
|
||||
|
||||
let &mut Foo(&x) = &mut Foo(&0);
|
||||
//~^ ERROR: patterns are not allowed to reset the default binding mode
|
||||
//~| WARN: this changes meaning in Rust 2024
|
||||
assert_type_eq(x, 0u8);
|
||||
|
||||
let &mut Foo(&mut x) = &mut Foo(&mut 0);
|
||||
//~^ ERROR: patterns are not allowed to reset the default binding mode
|
||||
//~| WARN: this changes meaning in Rust 2024
|
||||
assert_type_eq(x, 0u8);
|
||||
|
||||
if let Some(x) = &&&&&Some(&0u8) {
|
||||
assert_type_eq(x, &&0u8);
|
||||
}
|
||||
|
||||
if let &&&&&Some(&x) = &&&&&Some(&0u8) {
|
||||
//~^ ERROR: patterns are not allowed to reset the default binding mode
|
||||
//~| WARN: this changes meaning in Rust 2024
|
||||
assert_type_eq(x, 0u8);
|
||||
}
|
||||
|
||||
if let &&&&&Some(&mut x) = &&&&&Some(&mut 0u8) {
|
||||
//~^ ERROR: patterns are not allowed to reset the default binding mode
|
||||
//~| WARN: this changes meaning in Rust 2024
|
||||
assert_type_eq(x, 0u8);
|
||||
}
|
||||
|
||||
if let &&&&&mut Some(&x) = &&&&&mut Some(&0u8) {
|
||||
//~^ ERROR: patterns are not allowed to reset the default binding mode
|
||||
//~| WARN: this changes meaning in Rust 2024
|
||||
assert_type_eq(x, 0u8);
|
||||
}
|
||||
|
||||
if let &mut Some(&mut Some(&mut Some(ref mut x))) = &mut Some(&mut Some(&mut Some(0u8))) {
|
||||
//~^ ERROR: patterns are not allowed to reset the default binding mode
|
||||
//~| WARN: this changes meaning in Rust 2024
|
||||
assert_type_eq(x, &mut 0u8);
|
||||
}
|
||||
|
||||
struct Struct<A, B, C> {
|
||||
a: A,
|
||||
b: B,
|
||||
c: C,
|
||||
}
|
||||
|
||||
let &Struct { ref a, mut b, ref c } = &Struct { a: 0, b: 0, c: 0 };
|
||||
//~^ ERROR: patterns are not allowed to reset the default binding mode
|
||||
//~| WARN: this changes meaning in Rust 2024
|
||||
assert_type_eq(a, &0u32);
|
||||
assert_type_eq(b, 0u32);
|
||||
|
||||
let &Struct { a: &a, ref b, ref c } = &Struct { a: &0, b: &0, c: &0 };
|
||||
//~^ ERROR: patterns are not allowed to reset the default binding mode
|
||||
//~| WARN: this changes meaning in Rust 2024
|
||||
assert_type_eq(a, 0u32);
|
||||
assert_type_eq(b, &&0u32);
|
||||
assert_type_eq(c, &&0u32);
|
||||
|
||||
if let &Struct { a: &Some(a), b: &Some(&b), c: &Some(ref c) } =
|
||||
//~^ ERROR: patterns are not allowed to reset the default binding mode
|
||||
//~| WARN: this changes meaning in Rust 2024
|
||||
&(Struct { a: &Some(&0), b: &Some(&0), c: &Some(&0) })
|
||||
{
|
||||
assert_type_eq(a, &0u32);
|
||||
assert_type_eq(b, 0u32);
|
||||
assert_type_eq(c, &&0u32);
|
||||
}
|
||||
|
||||
match &(Some(0), Some(0)) {
|
||||
// The two patterns are the same syntactically, but because they're defined in different
|
||||
// editions they don't mean the same thing.
|
||||
&(Some(mut x), migration_lint_macros::mixed_edition_pat!(y)) => {
|
||||
//~^ ERROR: patterns are not allowed to reset the default binding mode
|
||||
assert_type_eq(x, 0u32);
|
||||
assert_type_eq(y, 0u32);
|
||||
}
|
||||
_ => {}
|
||||
}
|
||||
}
|
||||
@ -0,0 +1,144 @@
|
||||
//@ edition: 2021
|
||||
//@ run-rustfix
|
||||
//@ rustfix-only-machine-applicable
|
||||
//@ aux-build:migration_lint_macros.rs
|
||||
#![feature(mut_ref)]
|
||||
#![allow(incomplete_features, unused)]
|
||||
#![deny(rust_2024_incompatible_pat)]
|
||||
|
||||
extern crate migration_lint_macros;
|
||||
|
||||
struct Foo<T>(T);
|
||||
|
||||
// Tests type equality in a way that avoids coercing `&&T` to `&T`.
|
||||
trait Eq<T> {}
|
||||
impl<T> Eq<T> for T {}
|
||||
fn assert_type_eq<T, U: Eq<T>>(_: T, _: U) {}
|
||||
|
||||
fn main() {
|
||||
let Foo(x) = &Foo(0);
|
||||
assert_type_eq(x, &0u8);
|
||||
|
||||
let Foo(x) = &mut Foo(0);
|
||||
assert_type_eq(x, &mut 0u8);
|
||||
|
||||
let Foo(mut x) = &Foo(0);
|
||||
//~^ ERROR: patterns are not allowed to reset the default binding mode
|
||||
//~| WARN: this changes meaning in Rust 2024
|
||||
assert_type_eq(x, 0u8);
|
||||
|
||||
let Foo(mut x) = &mut Foo(0);
|
||||
//~^ ERROR: patterns are not allowed to reset the default binding mode
|
||||
//~| WARN: this changes meaning in Rust 2024
|
||||
assert_type_eq(x, 0u8);
|
||||
|
||||
let Foo(ref x) = &Foo(0);
|
||||
//~^ ERROR: patterns are not allowed to reset the default binding mode
|
||||
//~| WARN: this changes meaning in Rust 2024
|
||||
assert_type_eq(x, &0u8);
|
||||
|
||||
let Foo(ref x) = &mut Foo(0);
|
||||
//~^ ERROR: patterns are not allowed to reset the default binding mode
|
||||
//~| WARN: this changes meaning in Rust 2024
|
||||
assert_type_eq(x, &0u8);
|
||||
|
||||
let &Foo(x) = &Foo(0);
|
||||
assert_type_eq(x, 0u8);
|
||||
|
||||
let &mut Foo(x) = &mut Foo(0);
|
||||
assert_type_eq(x, 0u8);
|
||||
|
||||
let &Foo(x) = &Foo(&0);
|
||||
assert_type_eq(x, &0u8);
|
||||
|
||||
let &mut Foo(x) = &mut Foo(&0);
|
||||
assert_type_eq(x, &0u8);
|
||||
|
||||
let Foo(&x) = &Foo(&0);
|
||||
//~^ ERROR: patterns are not allowed to reset the default binding mode
|
||||
//~| WARN: this changes meaning in Rust 2024
|
||||
assert_type_eq(x, 0u8);
|
||||
|
||||
let Foo(&mut x) = &Foo(&mut 0);
|
||||
//~^ ERROR: patterns are not allowed to reset the default binding mode
|
||||
//~| WARN: this changes meaning in Rust 2024
|
||||
assert_type_eq(x, 0u8);
|
||||
|
||||
let Foo(&x) = &mut Foo(&0);
|
||||
//~^ ERROR: patterns are not allowed to reset the default binding mode
|
||||
//~| WARN: this changes meaning in Rust 2024
|
||||
assert_type_eq(x, 0u8);
|
||||
|
||||
let Foo(&mut x) = &mut Foo(&mut 0);
|
||||
//~^ ERROR: patterns are not allowed to reset the default binding mode
|
||||
//~| WARN: this changes meaning in Rust 2024
|
||||
assert_type_eq(x, 0u8);
|
||||
|
||||
if let Some(x) = &&&&&Some(&0u8) {
|
||||
assert_type_eq(x, &&0u8);
|
||||
}
|
||||
|
||||
if let Some(&x) = &&&&&Some(&0u8) {
|
||||
//~^ ERROR: patterns are not allowed to reset the default binding mode
|
||||
//~| WARN: this changes meaning in Rust 2024
|
||||
assert_type_eq(x, 0u8);
|
||||
}
|
||||
|
||||
if let Some(&mut x) = &&&&&Some(&mut 0u8) {
|
||||
//~^ ERROR: patterns are not allowed to reset the default binding mode
|
||||
//~| WARN: this changes meaning in Rust 2024
|
||||
assert_type_eq(x, 0u8);
|
||||
}
|
||||
|
||||
if let Some(&x) = &&&&&mut Some(&0u8) {
|
||||
//~^ ERROR: patterns are not allowed to reset the default binding mode
|
||||
//~| WARN: this changes meaning in Rust 2024
|
||||
assert_type_eq(x, 0u8);
|
||||
}
|
||||
|
||||
if let Some(&mut Some(Some(x))) = &mut Some(&mut Some(&mut Some(0u8))) {
|
||||
//~^ ERROR: patterns are not allowed to reset the default binding mode
|
||||
//~| WARN: this changes meaning in Rust 2024
|
||||
assert_type_eq(x, &mut 0u8);
|
||||
}
|
||||
|
||||
struct Struct<A, B, C> {
|
||||
a: A,
|
||||
b: B,
|
||||
c: C,
|
||||
}
|
||||
|
||||
let Struct { a, mut b, c } = &Struct { a: 0, b: 0, c: 0 };
|
||||
//~^ ERROR: patterns are not allowed to reset the default binding mode
|
||||
//~| WARN: this changes meaning in Rust 2024
|
||||
assert_type_eq(a, &0u32);
|
||||
assert_type_eq(b, 0u32);
|
||||
|
||||
let Struct { a: &a, b, ref c } = &Struct { a: &0, b: &0, c: &0 };
|
||||
//~^ ERROR: patterns are not allowed to reset the default binding mode
|
||||
//~| WARN: this changes meaning in Rust 2024
|
||||
assert_type_eq(a, 0u32);
|
||||
assert_type_eq(b, &&0u32);
|
||||
assert_type_eq(c, &&0u32);
|
||||
|
||||
if let Struct { a: &Some(a), b: Some(&b), c: Some(c) } =
|
||||
//~^ ERROR: patterns are not allowed to reset the default binding mode
|
||||
//~| WARN: this changes meaning in Rust 2024
|
||||
&(Struct { a: &Some(&0), b: &Some(&0), c: &Some(&0) })
|
||||
{
|
||||
assert_type_eq(a, &0u32);
|
||||
assert_type_eq(b, 0u32);
|
||||
assert_type_eq(c, &&0u32);
|
||||
}
|
||||
|
||||
match &(Some(0), Some(0)) {
|
||||
// The two patterns are the same syntactically, but because they're defined in different
|
||||
// editions they don't mean the same thing.
|
||||
(Some(mut x), migration_lint_macros::mixed_edition_pat!(y)) => {
|
||||
//~^ ERROR: patterns are not allowed to reset the default binding mode
|
||||
assert_type_eq(x, 0u32);
|
||||
assert_type_eq(y, 0u32);
|
||||
}
|
||||
_ => {}
|
||||
}
|
||||
}
|
||||
@ -0,0 +1,188 @@
|
||||
error: patterns are not allowed to reset the default binding mode in edition 2024
|
||||
--> $DIR/migration_lint.rs:25:9
|
||||
|
|
||||
LL | let Foo(mut x) = &Foo(0);
|
||||
| -^^^^^^^^^
|
||||
| |
|
||||
| help: desugar the match ergonomics: `&`
|
||||
|
|
||||
= warning: this changes meaning in Rust 2024
|
||||
= note: for more information, see 123076
|
||||
note: the lint level is defined here
|
||||
--> $DIR/migration_lint.rs:7:9
|
||||
|
|
||||
LL | #![deny(rust_2024_incompatible_pat)]
|
||||
| ^^^^^^^^^^^^^^^^^^^^^^^^^^
|
||||
|
||||
error: patterns are not allowed to reset the default binding mode in edition 2024
|
||||
--> $DIR/migration_lint.rs:30:9
|
||||
|
|
||||
LL | let Foo(mut x) = &mut Foo(0);
|
||||
| -^^^^^^^^^
|
||||
| |
|
||||
| help: desugar the match ergonomics: `&mut`
|
||||
|
|
||||
= warning: this changes meaning in Rust 2024
|
||||
= note: for more information, see 123076
|
||||
|
||||
error: patterns are not allowed to reset the default binding mode in edition 2024
|
||||
--> $DIR/migration_lint.rs:35:9
|
||||
|
|
||||
LL | let Foo(ref x) = &Foo(0);
|
||||
| -^^^^^^^^^
|
||||
| |
|
||||
| help: desugar the match ergonomics: `&`
|
||||
|
|
||||
= warning: this changes meaning in Rust 2024
|
||||
= note: for more information, see 123076
|
||||
|
||||
error: patterns are not allowed to reset the default binding mode in edition 2024
|
||||
--> $DIR/migration_lint.rs:40:9
|
||||
|
|
||||
LL | let Foo(ref x) = &mut Foo(0);
|
||||
| -^^^^^^^^^
|
||||
| |
|
||||
| help: desugar the match ergonomics: `&mut`
|
||||
|
|
||||
= warning: this changes meaning in Rust 2024
|
||||
= note: for more information, see 123076
|
||||
|
||||
error: patterns are not allowed to reset the default binding mode in edition 2024
|
||||
--> $DIR/migration_lint.rs:57:9
|
||||
|
|
||||
LL | let Foo(&x) = &Foo(&0);
|
||||
| -^^^^^^
|
||||
| |
|
||||
| help: desugar the match ergonomics: `&`
|
||||
|
|
||||
= warning: this changes meaning in Rust 2024
|
||||
= note: for more information, see 123076
|
||||
|
||||
error: patterns are not allowed to reset the default binding mode in edition 2024
|
||||
--> $DIR/migration_lint.rs:62:9
|
||||
|
|
||||
LL | let Foo(&mut x) = &Foo(&mut 0);
|
||||
| -^^^^^^^^^^
|
||||
| |
|
||||
| help: desugar the match ergonomics: `&`
|
||||
|
|
||||
= warning: this changes meaning in Rust 2024
|
||||
= note: for more information, see 123076
|
||||
|
||||
error: patterns are not allowed to reset the default binding mode in edition 2024
|
||||
--> $DIR/migration_lint.rs:67:9
|
||||
|
|
||||
LL | let Foo(&x) = &mut Foo(&0);
|
||||
| -^^^^^^
|
||||
| |
|
||||
| help: desugar the match ergonomics: `&mut`
|
||||
|
|
||||
= warning: this changes meaning in Rust 2024
|
||||
= note: for more information, see 123076
|
||||
|
||||
error: patterns are not allowed to reset the default binding mode in edition 2024
|
||||
--> $DIR/migration_lint.rs:72:9
|
||||
|
|
||||
LL | let Foo(&mut x) = &mut Foo(&mut 0);
|
||||
| -^^^^^^^^^^
|
||||
| |
|
||||
| help: desugar the match ergonomics: `&mut`
|
||||
|
|
||||
= warning: this changes meaning in Rust 2024
|
||||
= note: for more information, see 123076
|
||||
|
||||
error: patterns are not allowed to reset the default binding mode in edition 2024
|
||||
--> $DIR/migration_lint.rs:81:12
|
||||
|
|
||||
LL | if let Some(&x) = &&&&&Some(&0u8) {
|
||||
| -^^^^^^^
|
||||
| |
|
||||
| help: desugar the match ergonomics: `&&&&&`
|
||||
|
|
||||
= warning: this changes meaning in Rust 2024
|
||||
= note: for more information, see 123076
|
||||
|
||||
error: patterns are not allowed to reset the default binding mode in edition 2024
|
||||
--> $DIR/migration_lint.rs:87:12
|
||||
|
|
||||
LL | if let Some(&mut x) = &&&&&Some(&mut 0u8) {
|
||||
| -^^^^^^^^^^^
|
||||
| |
|
||||
| help: desugar the match ergonomics: `&&&&&`
|
||||
|
|
||||
= warning: this changes meaning in Rust 2024
|
||||
= note: for more information, see 123076
|
||||
|
||||
error: patterns are not allowed to reset the default binding mode in edition 2024
|
||||
--> $DIR/migration_lint.rs:93:12
|
||||
|
|
||||
LL | if let Some(&x) = &&&&&mut Some(&0u8) {
|
||||
| -^^^^^^^
|
||||
| |
|
||||
| help: desugar the match ergonomics: `&&&&&mut`
|
||||
|
|
||||
= warning: this changes meaning in Rust 2024
|
||||
= note: for more information, see 123076
|
||||
|
||||
error: patterns are not allowed to reset the default binding mode in edition 2024
|
||||
--> $DIR/migration_lint.rs:99:12
|
||||
|
|
||||
LL | if let Some(&mut Some(Some(x))) = &mut Some(&mut Some(&mut Some(0u8))) {
|
||||
| ^^^^^^^^^^^^^^^^^^^^^^^^
|
||||
|
|
||||
= warning: this changes meaning in Rust 2024
|
||||
= note: for more information, see 123076
|
||||
help: desugar the match ergonomics
|
||||
|
|
||||
LL | if let &mut Some(&mut Some(&mut Some(ref mut x))) = &mut Some(&mut Some(&mut Some(0u8))) {
|
||||
| ++++ ++++ +++++++
|
||||
|
||||
error: patterns are not allowed to reset the default binding mode in edition 2024
|
||||
--> $DIR/migration_lint.rs:111:9
|
||||
|
|
||||
LL | let Struct { a, mut b, c } = &Struct { a: 0, b: 0, c: 0 };
|
||||
| ^^^^^^^^^^^^^^^^^^^^^^
|
||||
|
|
||||
= warning: this changes meaning in Rust 2024
|
||||
= note: for more information, see 123076
|
||||
help: desugar the match ergonomics
|
||||
|
|
||||
LL | let &Struct { ref a, mut b, ref c } = &Struct { a: 0, b: 0, c: 0 };
|
||||
| + +++ +++
|
||||
|
||||
error: patterns are not allowed to reset the default binding mode in edition 2024
|
||||
--> $DIR/migration_lint.rs:117:9
|
||||
|
|
||||
LL | let Struct { a: &a, b, ref c } = &Struct { a: &0, b: &0, c: &0 };
|
||||
| ^^^^^^^^^^^^^^^^^^^^^^^^^^
|
||||
|
|
||||
= warning: this changes meaning in Rust 2024
|
||||
= note: for more information, see 123076
|
||||
help: desugar the match ergonomics
|
||||
|
|
||||
LL | let &Struct { a: &a, ref b, ref c } = &Struct { a: &0, b: &0, c: &0 };
|
||||
| + +++
|
||||
|
||||
error: patterns are not allowed to reset the default binding mode in edition 2024
|
||||
--> $DIR/migration_lint.rs:124:12
|
||||
|
|
||||
LL | if let Struct { a: &Some(a), b: Some(&b), c: Some(c) } =
|
||||
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
|
||||
|
|
||||
= warning: this changes meaning in Rust 2024
|
||||
= note: for more information, see 123076
|
||||
help: desugar the match ergonomics
|
||||
|
|
||||
LL | if let &Struct { a: &Some(a), b: &Some(&b), c: &Some(ref c) } =
|
||||
| + + + +++
|
||||
|
||||
error: patterns are not allowed to reset the default binding mode in edition 2024
|
||||
--> $DIR/migration_lint.rs:137:9
|
||||
|
|
||||
LL | (Some(mut x), migration_lint_macros::mixed_edition_pat!(y)) => {
|
||||
| -^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
|
||||
| |
|
||||
| help: desugar the match ergonomics: `&`
|
||||
|
||||
error: aborting due to 16 previous errors
|
||||
|
||||
@ -0,0 +1,46 @@
|
||||
//@ check-fail
|
||||
//@ edition: 2024
|
||||
//@ compile-flags: -Zunstable-options
|
||||
#![deny(rust_2024_incompatible_pat)]
|
||||
|
||||
fn main() {}
|
||||
|
||||
#[derive(Copy, Clone)]
|
||||
struct T;
|
||||
|
||||
struct Foo {
|
||||
f: &'static (u8,),
|
||||
}
|
||||
|
||||
macro_rules! test_pat_on_type {
|
||||
($($tt:tt)*) => {
|
||||
const _: () = {
|
||||
// Define a new function to ensure all cases are tested independently.
|
||||
fn foo($($tt)*) {}
|
||||
};
|
||||
};
|
||||
}
|
||||
|
||||
test_pat_on_type![(&x,): &(T,)]; //~ ERROR mismatched types
|
||||
test_pat_on_type![(&x,): &(&T,)]; //~ ERROR patterns are not allowed to reset the default binding mode
|
||||
test_pat_on_type![(&x,): &(&mut T,)]; //~ ERROR mismatched types
|
||||
test_pat_on_type![(&mut x,): &(&T,)]; //~ ERROR mismatched types
|
||||
test_pat_on_type![(&mut x,): &(&mut T,)]; //~ ERROR patterns are not allowed to reset the default binding mode
|
||||
test_pat_on_type![(&x,): &&mut &(T,)]; //~ ERROR mismatched types
|
||||
test_pat_on_type![Foo { f: (&x,) }: Foo]; //~ ERROR mismatched types
|
||||
test_pat_on_type![Foo { f: (&x,) }: &mut Foo]; //~ ERROR mismatched types
|
||||
test_pat_on_type![Foo { f: &(x,) }: &Foo]; //~ ERROR patterns are not allowed to reset the default binding mode
|
||||
test_pat_on_type![(mut x,): &(T,)]; //~ ERROR patterns are not allowed to reset the default binding mode
|
||||
test_pat_on_type![(ref x,): &(T,)]; //~ ERROR patterns are not allowed to reset the default binding mode
|
||||
test_pat_on_type![(ref mut x,): &mut (T,)]; //~ ERROR patterns are not allowed to reset the default binding mode
|
||||
|
||||
fn get<X>() -> X {
|
||||
unimplemented!()
|
||||
}
|
||||
|
||||
// Make sure this works even when the underlying type is inferred. This test passes on rust stable.
|
||||
fn infer<X: Copy>() -> X {
|
||||
match &get() {
|
||||
(&x,) => x, //~ ERROR patterns are not allowed to reset the default binding mode
|
||||
}
|
||||
}
|
||||
@ -0,0 +1,160 @@
|
||||
error[E0308]: mismatched types
|
||||
--> $DIR/min_match_ergonomics_fail.rs:24:20
|
||||
|
|
||||
LL | test_pat_on_type![(&x,): &(T,)];
|
||||
| ^^ ----- expected due to this
|
||||
| |
|
||||
| expected `T`, found `&_`
|
||||
|
|
||||
= note: expected struct `T`
|
||||
found reference `&_`
|
||||
help: consider removing `&` from the pattern
|
||||
|
|
||||
LL - test_pat_on_type![(&x,): &(T,)];
|
||||
LL + test_pat_on_type![(x,): &(T,)];
|
||||
|
|
||||
|
||||
error[E0308]: mismatched types
|
||||
--> $DIR/min_match_ergonomics_fail.rs:26:20
|
||||
|
|
||||
LL | test_pat_on_type![(&x,): &(&mut T,)];
|
||||
| ^^ ---------- expected due to this
|
||||
| |
|
||||
| types differ in mutability
|
||||
|
|
||||
= note: expected mutable reference `&mut T`
|
||||
found reference `&_`
|
||||
help: consider removing `&` from the pattern
|
||||
|
|
||||
LL - test_pat_on_type![(&x,): &(&mut T,)];
|
||||
LL + test_pat_on_type![(x,): &(&mut T,)];
|
||||
|
|
||||
|
||||
error[E0308]: mismatched types
|
||||
--> $DIR/min_match_ergonomics_fail.rs:27:20
|
||||
|
|
||||
LL | test_pat_on_type![(&mut x,): &(&T,)];
|
||||
| ^^^^^^ ------ expected due to this
|
||||
| |
|
||||
| types differ in mutability
|
||||
|
|
||||
= note: expected reference `&T`
|
||||
found mutable reference `&mut _`
|
||||
note: to declare a mutable binding use: `mut x`
|
||||
--> $DIR/min_match_ergonomics_fail.rs:27:20
|
||||
|
|
||||
LL | test_pat_on_type![(&mut x,): &(&T,)];
|
||||
| ^^^^^^
|
||||
help: consider removing `&mut` from the pattern
|
||||
|
|
||||
LL - test_pat_on_type![(&mut x,): &(&T,)];
|
||||
LL + test_pat_on_type![(x,): &(&T,)];
|
||||
|
|
||||
|
||||
error[E0308]: mismatched types
|
||||
--> $DIR/min_match_ergonomics_fail.rs:29:20
|
||||
|
|
||||
LL | test_pat_on_type![(&x,): &&mut &(T,)];
|
||||
| ^^ ----------- expected due to this
|
||||
| |
|
||||
| expected `T`, found `&_`
|
||||
|
|
||||
= note: expected struct `T`
|
||||
found reference `&_`
|
||||
help: consider removing `&` from the pattern
|
||||
|
|
||||
LL - test_pat_on_type![(&x,): &&mut &(T,)];
|
||||
LL + test_pat_on_type![(x,): &&mut &(T,)];
|
||||
|
|
||||
|
||||
error[E0308]: mismatched types
|
||||
--> $DIR/min_match_ergonomics_fail.rs:30:29
|
||||
|
|
||||
LL | test_pat_on_type![Foo { f: (&x,) }: Foo];
|
||||
| ^^ --- expected due to this
|
||||
| |
|
||||
| expected `u8`, found `&_`
|
||||
|
|
||||
= note: expected type `u8`
|
||||
found reference `&_`
|
||||
help: consider removing `&` from the pattern
|
||||
|
|
||||
LL - test_pat_on_type![Foo { f: (&x,) }: Foo];
|
||||
LL + test_pat_on_type![Foo { f: (x,) }: Foo];
|
||||
|
|
||||
|
||||
error[E0308]: mismatched types
|
||||
--> $DIR/min_match_ergonomics_fail.rs:31:29
|
||||
|
|
||||
LL | test_pat_on_type![Foo { f: (&x,) }: &mut Foo];
|
||||
| ^^ -------- expected due to this
|
||||
| |
|
||||
| expected `u8`, found `&_`
|
||||
|
|
||||
= note: expected type `u8`
|
||||
found reference `&_`
|
||||
help: consider removing `&` from the pattern
|
||||
|
|
||||
LL - test_pat_on_type![Foo { f: (&x,) }: &mut Foo];
|
||||
LL + test_pat_on_type![Foo { f: (x,) }: &mut Foo];
|
||||
|
|
||||
|
||||
error: patterns are not allowed to reset the default binding mode in edition 2024
|
||||
--> $DIR/min_match_ergonomics_fail.rs:25:19
|
||||
|
|
||||
LL | test_pat_on_type![(&x,): &(&T,)];
|
||||
| -^^^^
|
||||
| |
|
||||
| help: desugar the match ergonomics: `&`
|
||||
|
||||
error: patterns are not allowed to reset the default binding mode in edition 2024
|
||||
--> $DIR/min_match_ergonomics_fail.rs:28:19
|
||||
|
|
||||
LL | test_pat_on_type![(&mut x,): &(&mut T,)];
|
||||
| -^^^^^^^^
|
||||
| |
|
||||
| help: desugar the match ergonomics: `&`
|
||||
|
||||
error: patterns are not allowed to reset the default binding mode in edition 2024
|
||||
--> $DIR/min_match_ergonomics_fail.rs:32:19
|
||||
|
|
||||
LL | test_pat_on_type![Foo { f: &(x,) }: &Foo];
|
||||
| -^^^^^^^^^^^^^^^
|
||||
| |
|
||||
| help: desugar the match ergonomics: `&`
|
||||
|
||||
error: patterns are not allowed to reset the default binding mode in edition 2024
|
||||
--> $DIR/min_match_ergonomics_fail.rs:33:19
|
||||
|
|
||||
LL | test_pat_on_type![(mut x,): &(T,)];
|
||||
| -^^^^^^^
|
||||
| |
|
||||
| help: desugar the match ergonomics: `&`
|
||||
|
||||
error: patterns are not allowed to reset the default binding mode in edition 2024
|
||||
--> $DIR/min_match_ergonomics_fail.rs:34:19
|
||||
|
|
||||
LL | test_pat_on_type![(ref x,): &(T,)];
|
||||
| -^^^^^^^
|
||||
| |
|
||||
| help: desugar the match ergonomics: `&`
|
||||
|
||||
error: patterns are not allowed to reset the default binding mode in edition 2024
|
||||
--> $DIR/min_match_ergonomics_fail.rs:35:19
|
||||
|
|
||||
LL | test_pat_on_type![(ref mut x,): &mut (T,)];
|
||||
| -^^^^^^^^^^^
|
||||
| |
|
||||
| help: desugar the match ergonomics: `&mut`
|
||||
|
||||
error: patterns are not allowed to reset the default binding mode in edition 2024
|
||||
--> $DIR/min_match_ergonomics_fail.rs:44:9
|
||||
|
|
||||
LL | (&x,) => x,
|
||||
| -^^^^
|
||||
| |
|
||||
| help: desugar the match ergonomics: `&`
|
||||
|
||||
error: aborting due to 13 previous errors
|
||||
|
||||
For more information about this error, try `rustc --explain E0308`.
|
||||
@ -0,0 +1,17 @@
|
||||
//@ check-pass
|
||||
#![allow(incomplete_features)]
|
||||
|
||||
fn main() {}
|
||||
|
||||
// Tests type equality in a way that avoids coercing `&&T` to `&T`.
|
||||
trait Eq<T> {}
|
||||
impl<T> Eq<T> for T {}
|
||||
fn assert_type_eq<T, U: Eq<T>>(_: T, _: U) {}
|
||||
|
||||
#[derive(Copy, Clone)]
|
||||
struct T;
|
||||
|
||||
fn test() {
|
||||
let (x,) = &(&T,);
|
||||
assert_type_eq(x, &&T);
|
||||
}
|
||||
Loading…
Reference in New Issue
Block a user