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-rw-r--r--src/compiler/scala/tools/nsc/interpreter/TypeStrings.scala6
1 files changed, 5 insertions, 1 deletions
diff --git a/src/compiler/scala/tools/nsc/interpreter/TypeStrings.scala b/src/compiler/scala/tools/nsc/interpreter/TypeStrings.scala
index 6abb52a649..60399f53bf 100644
--- a/src/compiler/scala/tools/nsc/interpreter/TypeStrings.scala
+++ b/src/compiler/scala/tools/nsc/interpreter/TypeStrings.scala
@@ -212,7 +212,11 @@ trait TypeStrings {
}
private def tparamString[T: ru.TypeTag] : String = {
- def typeArguments: List[ru.Type] = ru.typeOf[T] match { case ru.TypeRef(_, _, args) => args; case _ => Nil }
+ def typeArguments: List[ru.Type] = {
+ import ru.TypeRefTag // otherwise the pattern match will be unchecked
+ // because TypeRef is an abstract type
+ ru.typeOf[T] match { case ru.TypeRef(_, _, args) => args; case _ => Nil }
+ }
// [Eugene to Paul] need to use not the `rootMirror`, but a mirror with the REPL's classloader
// how do I get to it? acquiring context classloader seems unreliable because of multithreading
def typeVariables: List[java.lang.Class[_]] = typeArguments map (targ => ru.rootMirror.runtimeClass(targ))