Fix build after rebase

src/librustc_const_eval/_match.rs

@@ -29,8 +29,6 @@ use rustc::ty::{self, AdtKind, Ty, TyCtxt, TypeFoldable};
 use rustc::mir::Field;
 use rustc::util::common::ErrorReported;
 
-use syntax::ast::DUMMY_NODE_ID;
-use syntax::ptr::P;
 use syntax_pos::{Span, DUMMY_SP};
 
 use arena::TypedArena;
@@ -272,8 +270,14 @@ impl<'tcx> Witness<'tcx> {
         ty: Ty<'tcx>)
         -> Self
     {
-        let arity = constructor_arity(cx, ctor, ty);
-        self.0.extend(repeat(cx.wild_pattern).take(arity).cloned());
+        let sub_pattern_tys = constructor_sub_pattern_tys(cx, ctor, ty);
+        self.0.extend(sub_pattern_tys.into_iter().map(|ty| {
+            Pattern {
+                ty: ty,
+                span: DUMMY_SP,
+                kind: box PatternKind::Wild,
+            }
+        }));
         self.apply_constructor(cx, ctor, ty)
     }
 
@@ -313,10 +317,11 @@ impl<'tcx> Witness<'tcx> {
                         }
                     }).collect();
 
-                    if let ty::TyAdt(adt, _) = ty.sty {
+                    if let ty::TyAdt(adt, substs) = ty.sty {
                         if adt.variants.len() > 1 {
                             PatternKind::Variant {
                                 adt_def: adt,
+                                substs: substs,
                                 variant_index: ctor.variant_index_for_adt(adt),
                                 subpatterns: pats
                             }
@@ -604,11 +609,11 @@ pub fn is_useful<'p, 'a: 'p, 'tcx: 'a>(cx: &mut MatchCheckCtxt<'a, 'tcx>,
                         // All constructors are unused. Add wild patterns
                         // rather than each individual constructor
                         pats.into_iter().map(|mut witness| {
-                            witness.0.push(P(hir::Pat {
-                                id: DUMMY_NODE_ID,
-                                node: PatKind::Wild,
+                            witness.0.push(Pattern {
+                                ty: pcx.ty,
                                 span: DUMMY_SP,
-                            }));
+                                kind: box PatternKind::Wild,
+                            });
                             witness
                         }).collect()
                     } else {
@@ -740,7 +745,7 @@ fn constructor_sub_pattern_tys<'a, 'tcx: 'a>(cx: &MatchCheckCtxt<'a, 'tcx>,
         },
         ty::TyRef(_, ref ty_and_mut) => vec![ty_and_mut.ty],
         ty::TyAdt(adt, substs) => {
-            ctor.variant_for_adt(adt).fields.iter().map(|field| {
+            adt.variants[ctor.variant_index_for_adt(adt)].fields.iter().map(|field| {
                 field.ty(cx.tcx, substs)
             }).collect()
         }

src/librustc_const_eval/check_match.rs

@@ -358,7 +358,7 @@ fn check_exhaustive<'a, 'tcx>(cx: &mut MatchCheckCtxt<'a, 'tcx>,
     match is_useful(cx, matrix, &[&wild_pattern], ConstructWitness) {
         UsefulWithWitness(pats) => {
             let witnesses = if pats.is_empty() {
-                vec![cx.wild_pattern]
+                vec![&wild_pattern]
             } else {
                 pats.iter().map(|w| w.single_pattern()).collect()
             };

src/librustc_const_eval/pattern.rs

@@ -393,8 +393,7 @@ impl<'a, 'gcx, 'tcx> PatternContext<'a, 'gcx, 'tcx> {
 
             PatKind::TupleStruct(ref qpath, ref subpatterns, ddpos) => {
                 let def = self.tcx.tables().qpath_def(qpath, pat.id);
-                let pat_ty = self.tcx.tables().node_id_to_type(pat.id);
-                let adt_def = match pat_ty.sty {
+                let adt_def = match ty.sty {
                     ty::TyAdt(adt_def, _) => adt_def,
                     _ => span_bug!(pat.span, "tuple struct pattern not applied to an ADT"),
                 };
@@ -413,8 +412,7 @@ impl<'a, 'gcx, 'tcx> PatternContext<'a, 'gcx, 'tcx> {
 
             PatKind::Struct(ref qpath, ref fields, _) => {
                 let def = self.tcx.tables().qpath_def(qpath, pat.id);
-                let pat_ty = self.tcx.tables().node_id_to_type(pat.id);
-                let adt_def = match pat_ty.sty {
+                let adt_def = match ty.sty {
                     ty::TyAdt(adt_def, _) => adt_def,
                     _ => {
                         span_bug!(
@@ -537,11 +535,14 @@ impl<'a, 'gcx, 'tcx> PatternContext<'a, 'gcx, 'tcx> {
     {
         match def {
             Def::Variant(variant_id) | Def::VariantCtor(variant_id, ..) => {
-                let (adt_def, substs) = match ty.sty {
-                    TypeVariants::TyAdt(adt_def, substs) => (adt_def, substs),
-                    _ => bug!("inappropriate type for def"),
-                };
+                let enum_id = self.tcx.parent_def_id(variant_id).unwrap();
+                let adt_def = self.tcx.lookup_adt_def(enum_id);
                 if adt_def.variants.len() > 1 {
+                    let substs = match ty.sty {
+                        TypeVariants::TyAdt(_, substs) => substs,
+                        TypeVariants::TyFnDef(_, substs, _) => substs,
+                        _ => bug!("inappropriate type for def: {:?}", ty.sty),
+                    };
                     PatternKind::Variant {
                         adt_def: adt_def,
                         substs: substs,
@@ -568,6 +569,7 @@ impl<'a, 'gcx, 'tcx> PatternContext<'a, 'gcx, 'tcx> {
                   pat_id: ast::NodeId,
                   span: Span)
                   -> Pattern<'tcx> {
+        let ty = self.tcx.tables().node_id_to_type(id);
         let def = self.tcx.tables().qpath_def(qpath, id);
         let kind = match def {
             Def::Const(def_id) | Def::AssociatedConst(def_id) => {
@@ -584,12 +586,12 @@ impl<'a, 'gcx, 'tcx> PatternContext<'a, 'gcx, 'tcx> {
                     }
                 }
             }
-            _ => self.lower_variant_or_leaf(def, ty, vec![])
+            _ => self.lower_variant_or_leaf(def, ty, vec![]),
         };
 
         Pattern {
             span: span,
-            ty: self.tcx.tables().node_id_to_type(id),
+            ty: ty,
             kind: Box::new(kind),
         }
     }
@@ -657,6 +659,7 @@ impl<'a, 'gcx, 'tcx> PatternContext<'a, 'gcx, 'tcx> {
                     hir::ExprPath(ref qpath) => qpath,
                     _ => bug!()
                 };
+                let ty = self.tcx.tables().node_id_to_type(callee.id);
                 let def = self.tcx.tables().qpath_def(qpath, callee.id);
                 match def {
                     Def::Fn(..) | Def::Method(..) => self.lower_lit(expr),
@@ -667,7 +670,7 @@ impl<'a, 'gcx, 'tcx> PatternContext<'a, 'gcx, 'tcx> {
                                 pattern: self.lower_const_expr(expr, pat_id, span)
                             }
                         }).collect();
-                        self.lower_variant_or_leaf(def, subpatterns)
+                        self.lower_variant_or_leaf(def, ty, subpatterns)
                     }
                 }
             }
@@ -702,7 +705,7 @@ impl<'a, 'gcx, 'tcx> PatternContext<'a, 'gcx, 'tcx> {
                           })
                           .collect();
 
-                self.lower_variant_or_leaf(def, subpatterns)
+                self.lower_variant_or_leaf(def, pat_ty, subpatterns)
             }
 
             hir::ExprArray(ref exprs) => {