Add assert that refine infos are legal wrt refined names

compiler/src/dotty/tools/dotc/core/Types.scala

@@ -2066,6 +2066,9 @@ object Types {
  */
  abstract case class RefinedType(parent: Type, refinedName: Name, refinedInfo: Type) extends RefinedOrRecType {
 
+ if (refinedName.isTermName) assert(refinedInfo.isInstanceOf[TermType])
+ else assert(refinedInfo.isInstanceOf[TypeType])
+
  override def underlying(implicit ctx: Context) = parent
 
  private def badInst =

tests/run/i2037.check

@@ -0,0 +1 @@
+malformed type

tests/run/i2037.scala

@@ -0,0 +1,26 @@
+import dotty.tools.dotc._
+import core._
+import Types._
+import Contexts._
+import Symbols._
+import Decorators._
+
+object Test {
+ def f(implicit ctx: Context) = {
+ val badType =
+ RefinedType(
+ ctx.requiredClassRef("scala.collection.AbstractIterator"),
+ "GroupedIterator".toTypeName,
+ TypeRef(ctx.requiredClassRef("scala.collection.AbstractIterator"), "GroupedIterator".toTypeName))
+ badType.member("GroupedIterator".toTypeName)
+ // badType.member("T".toTypeName)
+ }
+ def main(args: Array[String]): Unit = {
+ implicit val ctx = (new ContextBase).initialCtx
+ ctx.base.initialize()
+ try f
+ catch {
+ case ex: AssertionError => println("malformed type")
+ }
+ }
+}