bjoernager/rust
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Simplify pattern grammar by allowing nested leading vert

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Along the way, we also implement a handful of diagnostics improvements
and fixes, particularly with respect to the special handling of `||` in
place of `|` and when there are leading verts in function params, which
don't allow top-level or-patterns anyway.
This commit is contained in:
mark 2021-02-07 20:40:33 -06:00
parent d1206f950f
commit aee1e59e6f
18 changed files with 189 additions and 303 deletions
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2
compiler/rustc_parse/src/parser/stmt.rs
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@ -220,7 +220,7 @@ impl<'a> Parser<'a> {
/// Parses a local variable declaration.
fn parse_local(&mut self, attrs: AttrVec) -> PResult<'a, P<Local>> {
let lo = self.prev_token.span;
let pat = self.parse_top_pat(GateOr::Yes, RecoverComma::Yes)?;
let pat = self.parse_pat_allow_top_alt(None, GateOr::Yes, RecoverComma::Yes)?;
let (err, ty) = if self.eat(&token::Colon) {
// Save the state of the parser before parsing type normally, in case there is a `:`