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Error Message for createState assertion (#44610)

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* Init

* Added error message to assert

* Removing unrelated changes
This commit is contained in:
Kate Lovett 2019-11-15 13:05:18 -08:00 committed by GitHub
parent b1ca7f419e
commit ae62a3cf1b
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1 changed files with 6 additions and 1 deletions
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7
packages/flutter/lib/src/widgets/framework.dart
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@ -4055,7 +4055,12 @@ class StatefulElement extends ComponentElement {
}()); }());
assert(_state._element == null); assert(_state._element == null);
_state._element = this; _state._element = this;
assert(_state._widget == null); assert(
_state._widget == null,
'The createState function for $widget returned an old or invalid state '
'instance: ${_state._widget}, which is not null, violating the contract '
'for createState.',
);
_state._widget = widget; _state._widget = widget;
assert(_state._debugLifecycleState == _StateLifecycle.created); assert(_state._debugLifecycleState == _StateLifecycle.created);
} }