SI-7876 Scaladoc crasher due to regression in isFunctionType.

`isFunctionType` and `isTupleType` started returing true for
type constructors as of aeb73314. This led to a crash in type
printing in ScalaDoc (specfically, in ModelFactoryTypeSupport.scala)

This commit:
  - fixes those methods by guarding with !isHigherKinded
  - unit tests said methods
  - tests the reported crasher with a ScalaDoc test.

1 files changed, 2 insertions, 2 deletions

diff --git a/src/reflect/scala/reflect/internal/Definitions.scala b/src/reflect/scala/reflect/internal/Definitions.scala
index f8af4f155d..961e8e7264 100644
--- a/src/reflect/scala/reflect/internal/Definitions.scala
+++ b/src/reflect/scala/reflect/internal/Definitions.scala
@@ -658,8 +658,8 @@ trait Definitions extends api.StandardDefinitions {
 
     // These "direct" calls perform no dealiasing. They are most needed when
     // printing types when one wants to preserve the true nature of the type.
-    def isFunctionTypeDirect(tp: Type) = isFunctionSymbol(tp.typeSymbolDirect)
-    def isTupleTypeDirect(tp: Type)    = isTupleSymbol(tp.typeSymbolDirect)
+    def isFunctionTypeDirect(tp: Type) = !tp.isHigherKinded && isFunctionSymbol(tp.typeSymbolDirect)
+    def isTupleTypeDirect(tp: Type)    = !tp.isHigherKinded && isTupleSymbol(tp.typeSymbolDirect)
 
     // Note that these call .dealiasWiden and not .normalize, the latter of which
     // tends to change the course of events by forcing types.