Merge pull request #2193 from adriaanm/patmat-refactor

merge 2.10.1 into 2.10.x

1 files changed, 11 insertions, 4 deletions

diff --git a/src/reflect/scala/reflect/internal/Types.scala b/src/reflect/scala/reflect/internal/Types.scala
index 546df8a207..f5f577677c 100644
--- a/src/reflect/scala/reflect/internal/Types.scala
+++ b/src/reflect/scala/reflect/internal/Types.scala
@@ -3183,12 +3183,19 @@ trait Types extends api.Types { self: SymbolTable =>
        *    ?TC[?T] <: Any
        *  }}}
        */
-      def unifySimple = (
-        (params.isEmpty || tp.typeSymbol == NothingClass || tp.typeSymbol == AnyClass) && {
+      def unifySimple = {
+        val sym = tp.typeSymbol
+        if (sym == NothingClass || sym == AnyClass) { // kind-polymorphic
+          // SI-7126 if we register some type alias `T=Any`, we can later end
+          // with malformed types like `T[T]` during type inference in
+          // `handlePolymorphicCall`. No such problem if we register `Any`.
+          addBound(sym.tpe)
+          true
+        } else if (params.isEmpty) {
           addBound(tp)
           true
-        }
-      )
+        } else false
+      }
 
       /** Full case: involving a check of the form
        *  {{{