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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6
compiler/rustc_expand/src/expand.rs
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@ -22,7 +22,7 @@ use rustc_data_structures::stack::ensure_sufficient_stack;
use rustc_data_structures::sync::Lrc;
use rustc_errors::{Applicability, PResult};
use rustc_feature::Features;
use rustc_parse::parser::{AttemptLocalParseRecovery, ForceCollect, Parser};
use rustc_parse::parser::{AttemptLocalParseRecovery, ForceCollect, GateOr, Parser, RecoverComma};
use rustc_parse::validate_attr;
use rustc_session::lint::builtin::UNUSED_DOC_COMMENTS;
use rustc_session::lint::BuiltinLintDiagnostics;
@ -914,7 +914,9 @@ pub fn parse_ast_fragment<'a>(
}
}
AstFragmentKind::Ty => AstFragment::Ty(this.parse_ty()?),
AstFragmentKind::Pat => AstFragment::Pat(this.parse_pat(None)?),
AstFragmentKind::Pat => {
AstFragment::Pat(this.parse_pat_allow_top_alt(None, GateOr::Yes, RecoverComma::No)?)
}
AstFragmentKind::Arms
| AstFragmentKind::Fields
| AstFragmentKind::FieldPats