Throw exception if cast is about to fail

1 files changed, 2 insertions, 0 deletions

diff --git a/src/main/java/org/zwobble/couscous/frontends/java/JavaMethods.java b/src/main/java/org/zwobble/couscous/frontends/java/JavaMethods.java
index 0273faa..4aa57fd 100644
--- a/src/main/java/org/zwobble/couscous/frontends/java/JavaMethods.java
+++ b/src/main/java/org/zwobble/couscous/frontends/java/JavaMethods.java
@@ -43,6 +43,8 @@ class JavaMethods {
         Type erasedType = typeOf(erasedTypeBinding);
         if (erasedType.equals(type)) {
             return type;
+        } else if (!(erasedType instanceof TypeParameter)) {
+            throw new RuntimeException("Type parameter was " + erasedType);
         } else {
             return new BoundTypeParameter((TypeParameter) typeOf(erasedTypeBinding), type);
         }