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is_binding_pat: use explicit match & include or-pats in grammar #67428

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merged 2 commits into from
Dec 21, 2019
Merged

is_binding_pat: use explicit match & include or-pats in grammar #67428

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ffbde9f
is_binding_pat: don't use _ arm
Centril Dec 19, 2019
4414f0d
is_binding_pat: treat or-pat like tuple-pat
Centril Dec 19, 2019
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10 changes: 9 additions & 1 deletion src/librustc/middle/region.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -1173,6 +1173,7 @@ fn resolve_local<'tcx>(
/// | VariantName(..., P&, ...)
/// | [ ..., P&, ... ]
/// | ( ..., P&, ... )
/// | ... "|" P& "|" ...
/// | box P&
fn is_binding_pat(pat: &hir::Pat) -> bool {
// Note that the code below looks for *explicit* refs only, that is, it won't
Expand Down Expand Up @@ -1212,6 +1213,7 @@ fn resolve_local<'tcx>(
pats3.iter().any(|p| is_binding_pat(&p))
}

PatKind::Or(ref subpats) |
PatKind::TupleStruct(_, ref subpats, _) |
PatKind::Tuple(ref subpats, _) => {
subpats.iter().any(|p| is_binding_pat(&p))
Expand All @@ -1221,7 +1223,13 @@ fn resolve_local<'tcx>(
is_binding_pat(&subpat)
}

_ => false,
PatKind::Ref(_, _) |
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So it never applies to let & mut? ref mut? x atm -- why is that?

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Because it generally wouldn't be helpful. Extending the storage lifetime of a reference doesn't extend the lifetime of what it points to.

PatKind::Binding(hir::BindingAnnotation::Unannotated, ..) |
PatKind::Binding(hir::BindingAnnotation::Mutable, ..) |
PatKind::Wild |
PatKind::Path(_) |
PatKind::Lit(_) |
PatKind::Range(_, _, _) => false,
}
}

Expand Down