Better support for associated types in struct patterns

Author: petrochenkov

src/librustc/hir/pat_util.rs

@@ -76,7 +76,8 @@ pub fn pat_is_variant_or_struct(dm: &DefMap, pat: &hir::Pat) -> bool {
         PatKind::Path(..) |
         PatKind::Struct(..) => {
             match dm.get(&pat.id).map(|d| d.full_def()) {
-                Some(Def::Variant(..)) | Some(Def::Struct(..)) | Some(Def::TyAlias(..)) => true,
+                Some(Def::Variant(..)) | Some(Def::Struct(..)) |
+                Some(Def::TyAlias(..)) | Some(Def::AssociatedTy(..)) => true,
                 _ => false
             }
         }

src/librustc/ty/mod.rs

@@ -1715,7 +1715,7 @@ impl<'a, 'gcx, 'tcx, 'container> AdtDefData<'gcx, 'container> {
     pub fn variant_of_def(&self, def: Def) -> &VariantDefData<'gcx, 'container> {
         match def {
             Def::Variant(_, vid) => self.variant_with_id(vid),
-            Def::Struct(..) | Def::TyAlias(..) => self.struct_variant(),
+            Def::Struct(..) | Def::TyAlias(..) | Def::AssociatedTy(..) => self.struct_variant(),
             _ => bug!("unexpected def {:?} in variant_of_def", def)
         }
     }

src/librustc_trans/_match.rs

@@ -796,7 +796,7 @@ fn any_irrefutable_adt_pat(tcx: TyCtxt, m: &[Match], col: usize) -> bool {
             PatKind::Tuple(..) => true,
             PatKind::Struct(..) | PatKind::TupleStruct(..) | PatKind::Path(..) => {
                 match tcx.expect_def(pat.id) {
-                    Def::Struct(..) | Def::TyAlias(..) => true,
+                    Def::Struct(..) | Def::TyAlias(..) | Def::AssociatedTy(..) => true,
                     _ => false,
                 }
             }