Change HashSet element type to DefId

Author: sinkuu

src/librustc_mir/hair/pattern/mod.rs

@@ -1217,7 +1217,7 @@ fn search_for_adt_without_structural_match<'tcx>(tcx: TyCtxt<'tcx>,
 
         // tracks ADT's previously encountered during search, so that
         // we will not recur on them again.
-        seen: FxHashSet<&'tcx AdtDef>,
+        seen: FxHashSet<hir::def_id::DefId>,
     }
 
     impl<'tcx> TypeVisitor<'tcx> for Search<'tcx> {
@@ -1257,14 +1257,12 @@ fn search_for_adt_without_structural_match<'tcx>(tcx: TyCtxt<'tcx>,
                 return true // Halt visiting!
             }
 
-            if self.seen.contains(adt_def) {
+            if !self.seen.insert(adt_def.did) {
                 debug!("Search already seen adt_def: {:?}", adt_def);
                 // let caller continue its search
                 return false;
             }
 
-            self.seen.insert(adt_def);
-
             // `#[structural_match]` does not care about the
             // instantiation of the generics in an ADT (it
             // instead looks directly at its fields outside