mirror changes in 1.12??

[Anders Holmgren]

Just noticed something blow up in 1.12 that I haven't seen before. I get a TypeMirror without an owner. Should this be possible?

My crude method is

bool isSimpleType(TypeMirror tm) =>
(tm.isTopLevel && tm.owner.simpleName == #dart.core);

The exception is

Unhandled exception:
Uncaught Error: The null object does not have a getter 'simpleName'.

NoSuchMethodError: method not found: 'simpleName'
Receiver: null
Arguments: []
Stack Trace:
#0 Object._noSuchMethod (dart:core-patch/object_patch.dart:42)
#1 Object.noSuchMethod (dart:core-patch/object_patch.dart:45)
#2 isSimpleType (package:shelf_bind/src/util/mirror_util.dart:55:32)

[Gilad Bracha]

A TypeMirror should always have an owner. I can't tell whether tm really was a TypeMirror though. The owner should only be null for LibraryMirrors. If tm is a TypeMirror, please file a bug.

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