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servo/tests
bors-servo d4ddec8d33 Auto merge of #18209 - jdm:devirtualize, r=mbrubeck
Devirtualize CSS error reporting.

This removes a trait object from the path of reporting a CSS error.

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- [X] `./mach build -d` does not report any errors
- [X] `./mach test-tidy` does not report any errors
- [X] There are tests for these changes

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2017-08-24 13:19:25 -05:00
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