@NotNull
public static JetType createCorrespondingExtensionFunctionType(
@NotNull JetType functionType, @NotNull JetType receiverType) {
assert KotlinBuiltIns.getInstance().isFunctionType(functionType);
List<TypeProjection> typeArguments = functionType.getArguments();
assert !typeArguments.isEmpty();
List<JetType> arguments = Lists.newArrayList();
// excluding the last type argument of the function type, which is the return type
int index = 0;
int lastIndex = typeArguments.size() - 1;
for (TypeProjection typeArgument : typeArguments) {
if (index < lastIndex) {
arguments.add(typeArgument.getType());
}
index++;
}
JetType returnType = typeArguments.get(lastIndex).getType();
return KotlinBuiltIns.getInstance()
.getFunctionType(functionType.getAnnotations(), receiverType, arguments, returnType);
}
