Make GenericBound explicit

13 files changed, 53 insertions, 56 deletions

diff --git a/src/librustc/hir/lowering.rs b/src/librustc/hir/lowering.rs
index b725432eb5c..7628504ba0d 100644
--- a/src/librustc/hir/lowering.rs
+++ b/src/librustc/hir/lowering.rs
@@ -1109,11 +1109,11 @@ impl<'a> LoweringContext<'a> {
                 let bounds = bounds
                     .iter()
                     .filter_map(|bound| match *bound {
-                        Trait(ref ty, TraitBoundModifier::None) => {
+                        GenericBound::Trait(ref ty, TraitBoundModifier::None) => {
                             Some(self.lower_poly_trait_ref(ty, itctx))
                         }
-                        Trait(_, TraitBoundModifier::Maybe) => None,
-                        Outlives(ref lifetime) => {
+                        GenericBound::Trait(_, TraitBoundModifier::Maybe) => None,
+                        GenericBound::Outlives(ref lifetime) => {
                             if lifetime_bound.is_none() {
                                 lifetime_bound = Some(self.lower_lifetime(lifetime));
                             }
diff --git a/src/librustc_passes/ast_validation.rs b/src/librustc_passes/ast_validation.rs
index 4f04ad89698..fc54d323b0f 100644
--- a/src/librustc_passes/ast_validation.rs
+++ b/src/librustc_passes/ast_validation.rs
@@ -101,7 +101,7 @@ impl<'a> AstValidator<'a> {
 
     fn no_questions_in_bounds(&self, bounds: &GenericBounds, where_: &str, is_trait: bool) {
         for bound in bounds {
-            if let Trait(ref poly, TraitBoundModifier::Maybe) = *bound {
+            if let GenericBound::Trait(ref poly, TraitBoundModifier::Maybe) = *bound {
                 let mut err = self.err_handler().struct_span_err(poly.span,
                                     &format!("`?Trait` is not permitted in {}", where_));
                 if is_trait {
@@ -190,7 +190,7 @@ impl<'a> Visitor<'a> for AstValidator<'a> {
             TyKind::TraitObject(ref bounds, ..) => {
                 let mut any_lifetime_bounds = false;
                 for bound in bounds {
-                    if let Outlives(ref lifetime) = *bound {
+                    if let GenericBound::Outlives(ref lifetime) = *bound {
                         if any_lifetime_bounds {
                             span_err!(self.session, lifetime.ident.span, E0226,
                                       "only a single explicit lifetime bound is permitted");
@@ -203,7 +203,7 @@ impl<'a> Visitor<'a> for AstValidator<'a> {
             }
             TyKind::ImplTrait(ref bounds) => {
                 if !bounds.iter()
-                          .any(|b| if let Trait(..) = *b { true } else { false }) {
+                          .any(|b| if let GenericBound::Trait(..) = *b { true } else { false }) {
                     self.err_handler().span_err(ty.span, "at least one trait must be specified");
                 }
             }
diff --git a/src/librustc_save_analysis/dump_visitor.rs b/src/librustc_save_analysis/dump_visitor.rs
index 0f0f3f6e789..7da5b1668b3 100644
--- a/src/librustc_save_analysis/dump_visitor.rs
+++ b/src/librustc_save_analysis/dump_visitor.rs
@@ -761,10 +761,8 @@ impl<'l, 'tcx: 'l, 'll, O: DumpOutput + 'll> DumpVisitor<'l, 'tcx, 'll, O> {
         // super-traits
         for super_bound in trait_refs.iter() {
             let trait_ref = match *super_bound {
-                ast::Trait(ref trait_ref, _) => trait_ref,
-                ast::Outlives(..) => {
-                    continue;
-                }
+                ast::GenericBound::Trait(ref trait_ref, _) => trait_ref,
+                ast::GenericBound::Outlives(..) => continue,
             };
 
             let trait_ref = &trait_ref.trait_ref;
@@ -1489,7 +1487,7 @@ impl<'l, 'tcx: 'l, 'll, O: DumpOutput + 'll> Visitor<'l> for DumpVisitor<'l, 'tc
             ast::GenericParamKind::Lifetime { .. } => {}
             ast::GenericParamKind::Type { ref default, .. } => {
                 for bound in &param.bounds {
-                    if let ast::Trait(ref trait_ref, _) = *bound {
+                    if let ast::GenericBound::Trait(ref trait_ref, _) = *bound {
                         self.process_path(trait_ref.trait_ref.ref_id, &trait_ref.trait_ref.path)
                     }
                 }
diff --git a/src/librustdoc/clean/inline.rs b/src/librustdoc/clean/inline.rs
index f3a833bad8f..114cb0e455d 100644
--- a/src/librustdoc/clean/inline.rs
+++ b/src/librustdoc/clean/inline.rs
@@ -374,8 +374,8 @@ pub fn build_impl(cx: &DocContext, did: DefId, ret: &mut Vec<clean::Item>) {
     let polarity = tcx.impl_polarity(did);
     let trait_ = associated_trait.clean(cx).map(|bound| {
         match bound {
-            clean::TraitBound(polyt, _) => polyt.trait_,
-            clean::Outlives(..) => unreachable!(),
+            clean::GenericBound::TraitBound(polyt, _) => polyt.trait_,
+            clean::GenericBound::Outlives(..) => unreachable!(),
         }
     });
     if trait_.def_id() == tcx.lang_items().deref_trait() {
@@ -387,9 +387,9 @@ pub fn build_impl(cx: &DocContext, did: DefId, ret: &mut Vec<clean::Item>) {
 
     let provided = trait_.def_id().map(|did| {
         tcx.provided_trait_methods(did)
-            .into_iter()
-            .map(|meth| meth.name.to_string())
-            .collect()
+           .into_iter()
+           .map(|meth| meth.name.to_string())
+           .collect()
     }).unwrap_or(FxHashSet());
 
     ret.push(clean::Item {
diff --git a/src/librustdoc/clean/mod.rs b/src/librustdoc/clean/mod.rs
index 031a948fe80..0979c3d8558 100644
--- a/src/librustdoc/clean/mod.rs
+++ b/src/librustdoc/clean/mod.rs
@@ -14,7 +14,6 @@
 pub use self::Type::*;
 pub use self::Mutability::*;
 pub use self::ItemEnum::*;
-pub use self::GenericBound::*;
 pub use self::SelfTy::*;
 pub use self::FunctionRetTy::*;
 pub use self::Visibility::{Public, Inherited};
@@ -1470,7 +1469,7 @@ impl GenericBound {
         let path = external_path(cx, &cx.tcx.item_name(did).as_str(),
             Some(did), false, vec![], empty);
         inline::record_extern_fqn(cx, did, TypeKind::Trait);
-        TraitBound(PolyTrait {
+        GenericBound::TraitBound(PolyTrait {
             trait_: ResolvedPath {
                 path,
                 typarams: None,
@@ -1510,8 +1509,10 @@ impl GenericBound {
 impl Clean<GenericBound> for hir::GenericBound {
     fn clean(&self, cx: &DocContext) -> GenericBound {
         match *self {
-            hir::GenericBound::Outlives(lt) => Outlives(lt.clean(cx)),
-            hir::GenericBound::Trait(ref t, modifier) => TraitBound(t.clean(cx), modifier),
+            hir::GenericBound::Outlives(lt) => GenericBound::Outlives(lt.clean(cx)),
+            hir::GenericBound::Trait(ref t, modifier) => {
+                GenericBound::TraitBound(t.clean(cx), modifier)
+            }
         }
     }
 }
@@ -1599,7 +1600,7 @@ impl<'a, 'tcx> Clean<GenericBound> for (&'a ty::TraitRef<'tcx>, Vec<TypeBinding>
             }
         }
 
-        TraitBound(
+        GenericBound::TraitBound(
             PolyTrait {
                 trait_: ResolvedPath {
                     path,
@@ -1623,9 +1624,8 @@ impl<'tcx> Clean<GenericBound> for ty::TraitRef<'tcx> {
 impl<'tcx> Clean<Option<Vec<GenericBound>>> for Substs<'tcx> {
     fn clean(&self, cx: &DocContext) -> Option<Vec<GenericBound>> {
         let mut v = Vec::new();
-        v.extend(self.regions().filter_map(|r| r.clean(cx))
-                     .map(GenericBound::Outlives));
-        v.extend(self.types().map(|t| TraitBound(PolyTrait {
+        v.extend(self.regions().filter_map(|r| r.clean(cx)).map(GenericBound::Outlives));
+        v.extend(self.types().map(|t| GenericBound::TraitBound(PolyTrait {
             trait_: t.clean(cx),
             generic_params: Vec::new(),
         }, hir::TraitBoundModifier::None)));
@@ -2978,10 +2978,11 @@ impl Clean<Type> for hir::Ty {
                 match bounds[0].clean(cx).trait_ {
                     ResolvedPath { path, typarams: None, did, is_generic } => {
                         let mut bounds: Vec<self::GenericBound> = bounds[1..].iter().map(|bound| {
-                            TraitBound(bound.clean(cx), hir::TraitBoundModifier::None)
+                            self::GenericBound::TraitBound(bound.clean(cx),
+                                                           hir::TraitBoundModifier::None)
                         }).collect();
                         if !lifetime.is_elided() {
-                            bounds.push(self::Outlives(lifetime.clean(cx)));
+                            bounds.push(self::GenericBound::Outlives(lifetime.clean(cx)));
                         }
                         ResolvedPath { path, typarams: Some(bounds), did, is_generic, }
                     }
@@ -3086,7 +3087,7 @@ impl<'tcx> Clean<Type> for Ty<'tcx> {
                         let path = external_path(cx, &cx.tcx.item_name(did).as_str(),
                             Some(did), false, vec![], empty);
                         inline::record_extern_fqn(cx, did, TypeKind::Trait);
-                        let bound = TraitBound(PolyTrait {
+                        let bound = GenericBound::TraitBound(PolyTrait {
                             trait_: ResolvedPath {
                                 path,
                                 typarams: None,
diff --git a/src/librustdoc/clean/simplify.rs b/src/librustdoc/clean/simplify.rs
index a54eb64443b..30a55bf0d18 100644
--- a/src/librustdoc/clean/simplify.rs
+++ b/src/librustdoc/clean/simplify.rs
@@ -83,8 +83,8 @@ pub fn where_clauses(cx: &DocContext, clauses: Vec<WP>) -> Vec<WP> {
         };
         !bounds.iter_mut().any(|b| {
             let trait_ref = match *b {
-                clean::TraitBound(ref mut tr, _) => tr,
-                clean::Outlives(..) => return false,
+                clean::GenericBound::TraitBound(ref mut tr, _) => tr,
+                clean::GenericBound::Outlives(..) => return false,
             };
             let (did, path) = match trait_ref.trait_ {
                 clean::ResolvedPath { did, ref mut path, ..} => (did, path),
diff --git a/src/librustdoc/html/format.rs b/src/librustdoc/html/format.rs
index 987821d2e30..3d360f2f344 100644
--- a/src/librustdoc/html/format.rs
+++ b/src/librustdoc/html/format.rs
@@ -270,10 +270,10 @@ impl fmt::Display for clean::PolyTrait {
 impl fmt::Display for clean::GenericBound {
     fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
         match *self {
-            clean::Outlives(ref lt) => {
+            clean::GenericBound::Outlives(ref lt) => {
                 write!(f, "{}", *lt)
             }
-            clean::TraitBound(ref ty, modifier) => {
+            clean::GenericBound::TraitBound(ref ty, modifier) => {
                 let modifier_str = match modifier {
                     hir::TraitBoundModifier::None => "",
                     hir::TraitBoundModifier::Maybe => "?",
diff --git a/src/libsyntax/ast.rs b/src/libsyntax/ast.rs
index 9dc13fab2d6..76d19ce0ac5 100644
--- a/src/libsyntax/ast.rs
+++ b/src/libsyntax/ast.rs
@@ -10,7 +10,6 @@
 
 // The Rust abstract syntax tree.
 
-pub use self::GenericBound::*;
 pub use self::UnsafeSource::*;
 pub use self::GenericArgs::*;
 pub use symbol::{Ident, Symbol as Name};
@@ -290,8 +289,8 @@ pub enum GenericBound {
 impl GenericBound {
     pub fn span(&self) -> Span {
         match self {
-            &Trait(ref t, ..) => t.span,
-            &Outlives(ref l) => l.ident.span,
+            &GenericBound::Trait(ref t, ..) => t.span,
+            &GenericBound::Outlives(ref l) => l.ident.span,
         }
     }
 }
@@ -930,8 +929,8 @@ impl Expr {
     fn to_bound(&self) -> Option<GenericBound> {
         match &self.node {
             ExprKind::Path(None, path) =>
-                Some(Trait(PolyTraitRef::new(Vec::new(), path.clone(), self.span),
-                                       TraitBoundModifier::None)),
+                Some(GenericBound::Trait(PolyTraitRef::new(Vec::new(), path.clone(), self.span),
+                                         TraitBoundModifier::None)),
             _ => None,
         }
     }
diff --git a/src/libsyntax/ext/build.rs b/src/libsyntax/ext/build.rs
index 9de6e14fbeb..40d45306149 100644
--- a/src/libsyntax/ext/build.rs
+++ b/src/libsyntax/ext/build.rs
@@ -465,7 +465,8 @@ impl<'a> AstBuilder for ExtCtxt<'a> {
     }
 
     fn ty_param_bound(&self, path: ast::Path) -> ast::GenericBound {
-        ast::Trait(self.poly_trait_ref(path.span, path), ast::TraitBoundModifier::None)
+        ast::GenericBound::Trait(self.poly_trait_ref(path.span, path),
+                                 ast::TraitBoundModifier::None)
     }
 
     fn lifetime(&self, span: Span, ident: ast::Ident) -> ast::Lifetime {
diff --git a/src/libsyntax/fold.rs b/src/libsyntax/fold.rs
index 5db5d0781ea..03668cc279a 100644
--- a/src/libsyntax/fold.rs
+++ b/src/libsyntax/fold.rs
@@ -678,10 +678,12 @@ pub fn noop_fold_fn_decl<T: Folder>(decl: P<FnDecl>, fld: &mut T) -> P<FnDecl> {
 
 pub fn noop_fold_param_bound<T>(pb: GenericBound, fld: &mut T) -> GenericBound where T: Folder {
     match pb {
-        Trait(ty, modifier) => {
-            Trait(fld.fold_poly_trait_ref(ty), modifier)
+        GenericBound::Trait(ty, modifier) => {
+            GenericBound::Trait(fld.fold_poly_trait_ref(ty), modifier)
+        }
+        GenericBound::Outlives(lifetime) => {
+            GenericBound::Outlives(noop_fold_lifetime(lifetime, fld))
         }
-        Outlives(lifetime) => Outlives(noop_fold_lifetime(lifetime, fld)),
     }
 }
 
diff --git a/src/libsyntax/parse/parser.rs b/src/libsyntax/parse/parser.rs
index 8588f4c492f..675849c8a5c 100644
--- a/src/libsyntax/parse/parser.rs
+++ b/src/libsyntax/parse/parser.rs
@@ -10,7 +10,7 @@
 
 use rustc_target::spec::abi::{self, Abi};
 use ast::{AngleBracketedArgs, ParenthesizedArgData, AttrStyle, BareFnTy};
-use ast::{Outlives, Trait, TraitBoundModifier};
+use ast::{GenericBound, TraitBoundModifier};
 use ast::Unsafety;
 use ast::{Mod, AnonConst, Arg, Arm, Attribute, BindingMode, TraitItemKind};
 use ast::Block;
@@ -1444,7 +1444,7 @@ impl<'a> Parser<'a> {
                     TyKind::TraitObject(ref bounds, TraitObjectSyntax::None)
                             if maybe_bounds && bounds.len() == 1 && !trailing_plus => {
                         let path = match bounds[0] {
-                            Trait(ref pt, ..) => pt.trait_ref.path.clone(),
+                            GenericBound::Trait(ref pt, ..) => pt.trait_ref.path.clone(),
                             _ => self.bug("unexpected lifetime bound"),
                         };
                         self.parse_remaining_bounds(Vec::new(), path, lo, true)?
@@ -1566,7 +1566,7 @@ impl<'a> Parser<'a> {
     fn parse_remaining_bounds(&mut self, generic_params: Vec<GenericParam>, path: ast::Path,
                               lo: Span, parse_plus: bool) -> PResult<'a, TyKind> {
         let poly_trait_ref = PolyTraitRef::new(generic_params, path, lo.to(self.prev_span));
-        let mut bounds = vec![Trait(poly_trait_ref, TraitBoundModifier::None)];
+        let mut bounds = vec![GenericBound::Trait(poly_trait_ref, TraitBoundModifier::None)];
         if parse_plus {
             self.eat_plus(); // `+`, or `+=` gets split and `+` is discarded
             bounds.append(&mut self.parse_ty_param_bounds()?);
@@ -4752,7 +4752,7 @@ impl<'a> Parser<'a> {
                         self.span_err(question_span,
                                       "`?` may only modify trait bounds, not lifetime bounds");
                     }
-                    bounds.push(Outlives(self.expect_lifetime()));
+                    bounds.push(GenericBound::Outlives(self.expect_lifetime()));
                     if has_parens {
                         self.expect(&token::CloseDelim(token::Paren))?;
                         self.span_err(self.prev_span,
@@ -4770,7 +4770,7 @@ impl<'a> Parser<'a> {
                     } else {
                         TraitBoundModifier::None
                     };
-                    bounds.push(Trait(poly_trait, modifier));
+                    bounds.push(GenericBound::Trait(poly_trait, modifier));
                 }
             } else {
                 break
diff --git a/src/libsyntax/print/pprust.rs b/src/libsyntax/print/pprust.rs
index 1e0b107ef6e..7a55919f422 100644
--- a/src/libsyntax/print/pprust.rs
+++ b/src/libsyntax/print/pprust.rs
@@ -12,7 +12,7 @@ pub use self::AnnNode::*;
 
 use rustc_target::spec::abi::{self, Abi};
 use ast::{self, BlockCheckMode, PatKind, RangeEnd, RangeSyntax};
-use ast::{SelfKind, Outlives, Trait, TraitBoundModifier};
+use ast::{SelfKind, GenericBound, TraitBoundModifier};
 use ast::{Attribute, MacDelimiter, GenericArg};
 use util::parser::{self, AssocOp, Fixity};
 use attr;
@@ -1364,7 +1364,7 @@ impl<'a> State<'a> {
                 self.print_generic_params(&generics.params)?;
                 let mut real_bounds = Vec::with_capacity(bounds.len());
                 for b in bounds.iter() {
-                    if let Trait(ref ptr, ast::TraitBoundModifier::Maybe) = *b {
+                    if let GenericBound::Trait(ref ptr, ast::TraitBoundModifier::Maybe) = *b {
                         self.s.space()?;
                         self.word_space("for ?")?;
                         self.print_trait_ref(&ptr.trait_ref)?;
@@ -1390,7 +1390,7 @@ impl<'a> State<'a> {
                 let mut real_bounds = Vec::with_capacity(bounds.len());
                 // FIXME(durka) this seems to be some quite outdated syntax
                 for b in bounds.iter() {
-                    if let Trait(ref ptr, ast::TraitBoundModifier::Maybe) = *b {
+                    if let GenericBound::Trait(ref ptr, ast::TraitBoundModifier::Maybe) = *b {
                         self.s.space()?;
                         self.word_space("for ?")?;
                         self.print_trait_ref(&ptr.trait_ref)?;
@@ -2826,13 +2826,13 @@ impl<'a> State<'a> {
                 }
 
                 match bound {
-                    Trait(tref, modifier) => {
+                    GenericBound::Trait(tref, modifier) => {
                         if modifier == &TraitBoundModifier::Maybe {
                             self.s.word("?")?;
                         }
                         self.print_poly_trait_ref(tref)?;
                     }
-                    Outlives(lt) => self.print_lifetime(*lt)?,
+                    GenericBound::Outlives(lt) => self.print_lifetime(*lt)?,
                 }
             }
         }
diff --git a/src/libsyntax/visit.rs b/src/libsyntax/visit.rs
index 71b606f08a5..5476a3f0d2a 100644
--- a/src/libsyntax/visit.rs
+++ b/src/libsyntax/visit.rs
@@ -481,12 +481,8 @@ pub fn walk_global_asm<'a, V: Visitor<'a>>(_: &mut V, _: &'a GlobalAsm) {
 
 pub fn walk_param_bound<'a, V: Visitor<'a>>(visitor: &mut V, bound: &'a GenericBound) {
     match *bound {
-        Trait(ref typ, ref modifier) => {
-            visitor.visit_poly_trait_ref(typ, modifier);
-        }
-        Outlives(ref lifetime) => {
-            visitor.visit_lifetime(lifetime);
-        }
+        GenericBound::Trait(ref typ, ref modifier) => visitor.visit_poly_trait_ref(typ, modifier),
+        GenericBound::Outlives(ref lifetime) => visitor.visit_lifetime(lifetime),
     }
 }