Fixed E0528 label and unit test

[EugeneGonzalez]

Fixes #36194 part of #35233.

r? @jonathandturner

[rust-highfive]

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[EugeneGonzalez]

@jonathandturner this is ready for review. Travis-CI failed because of #36138.

[sophiajt]

Looks good.

@bors r+ rollup

[bors]

📌 Commit 7cd4e7f has been approved by jonathandturner