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resolve: already-bound-check: account for or-patterns.

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Also document `ast::Pat::walk`.
This commit is contained in:
Mazdak Farrokhzad 2019-08-28 07:13:34 +02:00
parent dc91e229d2
commit 70cae78387
3 changed files with 89 additions and 60 deletions
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20
src/libsyntax/ast.rs
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@ -561,29 +561,31 @@ impl Pat {
}))
}
pub fn walk<F>(&self, it: &mut F) -> bool
where
F: FnMut(&Pat) -> bool,
{
/// Walk top-down and call `it` in each place where a pattern occurs
/// starting with the root pattern `walk` is called on. If `it` returns
/// false then we will decend no further but siblings will be processed.
pub fn walk(&self, it: &mut impl FnMut(&Pat) -> bool) {
if !it(self) {
return false;
return;
}
match &self.node {
PatKind::Ident(_, _, Some(p)) => p.walk(it),
PatKind::Struct(_, fields, _) => fields.iter().all(|field| field.pat.walk(it)),
PatKind::Struct(_, fields, _) => fields.iter().for_each(|field| field.pat.walk(it)),
PatKind::TupleStruct(_, s)
| PatKind::Tuple(s)
| PatKind::Slice(s)
| PatKind::Or(s) => s.iter().all(|p| p.walk(it)),
PatKind::Box(s) | PatKind::Ref(s, _) | PatKind::Paren(s) => s.walk(it),
| PatKind::Or(s) => s.iter().for_each(|p| p.walk(it)),
PatKind::Box(s)
| PatKind::Ref(s, _)
| PatKind::Paren(s) => s.walk(it),
PatKind::Wild
| PatKind::Rest
| PatKind::Lit(_)
| PatKind::Range(..)
| PatKind::Ident(..)
| PatKind::Path(..)
| PatKind::Mac(_) => true,
| PatKind::Mac(_) => {},
}
}