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--- WebIDL.py
+++ WebIDL.py
@@ -1069,6 +1069,12 @@ class IDLInterface(IDLObjectWithScope, IDLExposureMixins):
specialMembersSeen[memberType] = member
+ if (self.getExtendedAttribute("LegacyUnenumerableNamedProperties") and
+ "named getters" not in specialMembersSeen):
+ raise WebIDLError("[LegacyUnenumerableNamedProperties] used on an interface "
+ "without a named getter",
+ [self.location])
+
if self._isOnGlobalProtoChain:
# Make sure we have no named setters, creators, or deleters
for memberType in ["setter", "creator", "deleter"]:
@@ -1417,7 +1423,8 @@ class IDLInterface(IDLObjectWithScope, IDLExposureMixins):
identifier == "UnsafeInPrerendering" or
identifier == "LegacyEventInit" or
identifier == "ProbablyShortLivingObject" or
- identifier == "Abstract"):
+ identifier == "Abstract" or
+ identifier == "LegacyUnenumerableNamedProperties"):
# Known extended attributes that do not take values
if not attr.noArguments():
raise WebIDLError("[%s] must take no arguments" % identifier,
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