When accessing private field of union, do not misidentify it as a struct#63982

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bors merged 2 commits intorust-lang:masterfrom

sam09:fix-63976

Aug 30, 2019

Commits on Aug 28, 2019

Fixes #63976. Incorrect error message.
sam09
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Commits on Aug 29, 2019

Fix test.
sam09
committed