diff --git a/src/librustc_front/lowering.rs b/src/librustc_front/lowering.rs index 9be88a391ec..bb113a7ad6a 100644 --- a/src/librustc_front/lowering.rs +++ b/src/librustc_front/lowering.rs @@ -920,11 +920,14 @@ pub fn lower_pat(lctx: &LoweringContext, p: &Pat) -> P { sub.as_ref().map(|x| lower_pat(lctx, x))) } PatKind::Lit(ref e) => hir::PatLit(lower_expr(lctx, e)), - PatKind::Enum(ref pth, ref pats) => { + PatKind::TupleStruct(ref pth, ref pats) => { hir::PatEnum(lower_path(lctx, pth), pats.as_ref() .map(|pats| pats.iter().map(|x| lower_pat(lctx, x)).collect())) } + PatKind::Path(ref pth) => { + hir::PatEnum(lower_path(lctx, pth), Some(hir::HirVec::new())) + } PatKind::QPath(ref qself, ref pth) => { let qself = hir::QSelf { ty: lower_ty(lctx, &qself.ty), diff --git a/src/librustc_trans/save/mod.rs b/src/librustc_trans/save/mod.rs index 6a486501c6b..9c529ccbe00 100644 --- a/src/librustc_trans/save/mod.rs +++ b/src/librustc_trans/save/mod.rs @@ -762,7 +762,8 @@ impl<'v> Visitor<'v> for PathCollector { self.collected_paths.push((p.id, path.clone(), ast::Mutability::Mutable, recorder::TypeRef)); } - PatKind::Enum(ref path, _) | + PatKind::TupleStruct(ref path, _) | + PatKind::Path(ref path) | PatKind::QPath(_, ref path) => { self.collected_paths.push((p.id, path.clone(), ast::Mutability::Mutable, recorder::VarRef)); diff --git a/src/libsyntax/ast.rs b/src/libsyntax/ast.rs index 0a208082e55..cb79c609c1b 100644 --- a/src/libsyntax/ast.rs +++ b/src/libsyntax/ast.rs @@ -555,18 +555,27 @@ pub enum PatKind { /// Represents a wildcard pattern (`_`) Wild, - /// A PatKind::Ident may either be a new bound variable, - /// or a nullary enum (in which case the third field - /// is None). + /// A `PatKind::Ident` may either be a new bound variable, + /// or a unit struct/variant pattern, or a const pattern (in the last two cases + /// the third field must be `None`). /// - /// In the nullary enum case, the parser can't determine + /// In the unit or const pattern case, the parser can't determine /// which it is. The resolver determines this, and - /// records this pattern's NodeId in an auxiliary - /// set (of "PatIdents that refer to nullary enums") + /// records this pattern's `NodeId` in an auxiliary + /// set (of "PatIdents that refer to unit patterns or constants"). Ident(BindingMode, SpannedIdent, Option>), + /// A struct or struct variant pattern, e.g. `Variant {x, y, ..}`. + /// The `bool` is `true` in the presence of a `..`. + Struct(Path, Vec>, bool), + + /// A tuple struct/variant pattern `Variant(x, y, z)`. /// "None" means a `Variant(..)` pattern where we don't bind the fields to names. - Enum(Path, Option>>), + TupleStruct(Path, Option>>), + + /// A path pattern. + /// Such pattern can be resolved to a unit struct/variant or a constant. + Path(Path), /// An associated const named using the qualified path `::CONST` or /// `::CONST`. Associated consts from inherent impls can be @@ -574,9 +583,6 @@ pub enum PatKind { /// PatKind::Enum, and the resolver will have to sort that out. QPath(QSelf, Path), - /// Destructuring of a struct, e.g. `Foo {x, y, ..}` - /// The `bool` is `true` in the presence of a `..` - Struct(Path, Vec>, bool), /// A tuple pattern `(a, b)` Tup(Vec>), /// A `box` pattern diff --git a/src/libsyntax/ext/build.rs b/src/libsyntax/ext/build.rs index 312154e5a8d..0eb42f17f68 100644 --- a/src/libsyntax/ext/build.rs +++ b/src/libsyntax/ext/build.rs @@ -827,7 +827,11 @@ impl<'a> AstBuilder for ExtCtxt<'a> { self.pat(span, pat) } fn pat_enum(&self, span: Span, path: ast::Path, subpats: Vec>) -> P { - let pat = PatKind::Enum(path, Some(subpats)); + let pat = if subpats.is_empty() { + PatKind::Path(path) + } else { + PatKind::TupleStruct(path, Some(subpats)) + }; self.pat(span, pat) } fn pat_struct(&self, span: Span, diff --git a/src/libsyntax/fold.rs b/src/libsyntax/fold.rs index 548d883d93f..d75e8f796ae 100644 --- a/src/libsyntax/fold.rs +++ b/src/libsyntax/fold.rs @@ -1127,10 +1127,13 @@ pub fn noop_fold_pat(p: P, folder: &mut T) -> P { sub.map(|x| folder.fold_pat(x))) } PatKind::Lit(e) => PatKind::Lit(folder.fold_expr(e)), - PatKind::Enum(pth, pats) => { - PatKind::Enum(folder.fold_path(pth), + PatKind::TupleStruct(pth, pats) => { + PatKind::TupleStruct(folder.fold_path(pth), pats.map(|pats| pats.move_map(|x| folder.fold_pat(x)))) } + PatKind::Path(pth) => { + PatKind::Path(folder.fold_path(pth)) + } PatKind::QPath(qself, pth) => { let qself = QSelf {ty: folder.fold_ty(qself.ty), .. qself}; PatKind::QPath(qself, folder.fold_path(pth)) diff --git a/src/libsyntax/parse/parser.rs b/src/libsyntax/parse/parser.rs index f1de30b373f..a8d35783c6f 100644 --- a/src/libsyntax/parse/parser.rs +++ b/src/libsyntax/parse/parser.rs @@ -3534,14 +3534,14 @@ impl<'a> Parser<'a> { self.bump(); self.bump(); try!(self.expect(&token::CloseDelim(token::Paren))); - pat = PatKind::Enum(path, None); + pat = PatKind::TupleStruct(path, None); } else { let args = try!(self.parse_enum_variant_seq( &token::OpenDelim(token::Paren), &token::CloseDelim(token::Paren), seq_sep_trailing_allowed(token::Comma), |p| p.parse_pat())); - pat = PatKind::Enum(path, Some(args)); + pat = PatKind::TupleStruct(path, Some(args)); } } _ => { @@ -3549,7 +3549,7 @@ impl<'a> Parser<'a> { // Parse qualified path Some(qself) => PatKind::QPath(qself, path), // Parse nullary enum - None => PatKind::Enum(path, Some(vec![])) + None => PatKind::Path(path) }; } } diff --git a/src/libsyntax/print/pprust.rs b/src/libsyntax/print/pprust.rs index 5a1a581bc43..b4e08d65a0a 100644 --- a/src/libsyntax/print/pprust.rs +++ b/src/libsyntax/print/pprust.rs @@ -2478,20 +2478,21 @@ impl<'a> State<'a> { None => () } } - PatKind::Enum(ref path, ref args_) => { + PatKind::TupleStruct(ref path, ref args_) => { try!(self.print_path(path, true, 0)); match *args_ { None => try!(word(&mut self.s, "(..)")), Some(ref args) => { - if !args.is_empty() { - try!(self.popen()); - try!(self.commasep(Inconsistent, &args[..], - |s, p| s.print_pat(&p))); - try!(self.pclose()); - } + try!(self.popen()); + try!(self.commasep(Inconsistent, &args[..], + |s, p| s.print_pat(&p))); + try!(self.pclose()); } } } + PatKind::Path(ref path) => { + try!(self.print_path(path, true, 0)); + } PatKind::QPath(ref qself, ref path) => { try!(self.print_qpath(path, qself, false)); } diff --git a/src/libsyntax/visit.rs b/src/libsyntax/visit.rs index bd4e8b70231..f26610b8b8d 100644 --- a/src/libsyntax/visit.rs +++ b/src/libsyntax/visit.rs @@ -419,12 +419,15 @@ pub fn walk_assoc_type_binding<'v, V: Visitor<'v>>(visitor: &mut V, pub fn walk_pat<'v, V: Visitor<'v>>(visitor: &mut V, pattern: &'v Pat) { match pattern.node { - PatKind::Enum(ref path, ref opt_children) => { + PatKind::TupleStruct(ref path, ref opt_children) => { visitor.visit_path(path, pattern.id); if let Some(ref children) = *opt_children { walk_list!(visitor, visit_pat, children); } } + PatKind::Path(ref path) => { + visitor.visit_path(path, pattern.id); + } PatKind::QPath(ref qself, ref path) => { visitor.visit_ty(&qself.ty); visitor.visit_path(path, pattern.id)