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-rw-r--r--dom/bindings/parser/WebIDL.py6
1 files changed, 4 insertions, 2 deletions
diff --git a/dom/bindings/parser/WebIDL.py b/dom/bindings/parser/WebIDL.py
index 7d06dbcec..8c71333fa 100644
--- a/dom/bindings/parser/WebIDL.py
+++ b/dom/bindings/parser/WebIDL.py
@@ -2321,8 +2321,10 @@ class IDLNullableType(IDLParameterizedType):
return self
def isDistinguishableFrom(self, other):
- if (other.nullable() or (other.isUnion() and other.hasNullableType) or
- other.isDictionary()):
+ if (other.nullable() or
+ other.isDictionary() or
+ (other.isUnion() and
+ (other.hasNullableType or other.hasDictionaryType()))):
# Can't tell which type null should become
return False
return self.inner.isDistinguishableFrom(other)