Fix contextually typing arguments object#18392
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Previously, it would crash — the arguments object is a transient symbol with no declaration, and `getEffectiveTypeAnnotationNode` does not accept `undefined`.
weswigham
approved these changes
Sep 11, 2017
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Fixes #16585
assignContextualParameterTypeshandles theargumentsobject correctly now. Previously, it would crash; the arguments object is a transient symbol with no declaration, andgetEffectiveTypeAnnotationNodedoes not handleundefined.