rustc_mir_build::thir::pattern::migration

Struct PatMigration

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pub(super) struct PatMigration<'a> {
    suggestion: Vec<(Span, String)>,
    ref_pattern_count: usize,
    binding_mode_count: usize,
    default_mode_span: Option<(Span, Mutability)>,
    default_mode_labels: FxIndexMap<Span, Mutability>,
    info: &'a Rust2024IncompatiblePatInfo,
}
Expand description

For patterns flagged for migration during HIR typeck, this handles constructing and emitting a diagnostic suggestion.

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§suggestion: Vec<(Span, String)>§ref_pattern_count: usize§binding_mode_count: usize§default_mode_span: Option<(Span, Mutability)>

Internal state: the ref-mutability of the default binding mode at the subpattern being lowered, with the span where it was introduced. None for a by-value default mode.

§default_mode_labels: FxIndexMap<Span, Mutability>

Labels for where incompatibility-causing by-ref default binding modes were introduced.

§info: &'a Rust2024IncompatiblePatInfo

Information collected from typeck, including spans for subpatterns invalid in Rust 2024.

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impl<'a> PatMigration<'a>

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pub(super) fn new(info: &'a Rust2024IncompatiblePatInfo) -> Self

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pub(super) fn emit<'tcx>(self, tcx: TyCtxt<'tcx>, pat_id: HirId)

On Rust 2024, this emits a hard error. On earlier Editions, this emits the future-incompatibility lint rust_2024_incompatible_pat.

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pub(super) fn visit_implicit_derefs<'tcx>( &mut self, pat_span: Span, adjustments: &[Ty<'tcx>], ) -> Option<(Span, Mutability)>

Tracks when we’re lowering a pattern that implicitly dereferences the scrutinee. This should only be called when the pattern type adjustments list adjustments is non-empty. Returns the prior default binding mode; this should be followed by a call to PatMigration::leave_ref to restore it when we leave the pattern.

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pub(super) fn visit_explicit_deref(&mut self) -> Option<(Span, Mutability)>

Tracks the default binding mode when we’re lowering a & or &mut pattern. Returns the prior default binding mode; this should be followed by a call to PatMigration::leave_ref to restore it when we leave the pattern.

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pub(super) fn leave_ref(&mut self, old_mode_span: Option<(Span, Mutability)>)

Restores the default binding mode after lowering a pattern that could change it. This should follow a call to either PatMigration::visit_explicit_deref or PatMigration::visit_implicit_derefs.

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pub(super) fn visit_binding( &mut self, pat_span: Span, mode: BindingMode, explicit_ba: BindingMode, ident: Ident, )

Determines if a binding is relevant to the diagnostic and adjusts the notes/suggestion if so. Bindings are relevant if they have a modifier under a by-ref default mode (invalid in Rust 2024) or if we need to suggest a binding modifier for them.

Auto Trait Implementations§

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impl<'a> DynSend for PatMigration<'a>

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impl<'a> DynSync for PatMigration<'a>

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impl<'a> Freeze for PatMigration<'a>

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impl<'a> RefUnwindSafe for PatMigration<'a>

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impl<'a> Send for PatMigration<'a>

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impl<'a> Sync for PatMigration<'a>

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impl<'a> Unpin for PatMigration<'a>

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impl<'a> UnwindSafe for PatMigration<'a>

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impl<T> Aligned for T

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const ALIGN: Alignment

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Note: Most layout information is completely unstable and may even differ between compilations. The only exception is types with certain repr(...) attributes. Please see the Rust Reference's “Type Layout” chapter for details on type layout guarantees.

Size: 120 bytes