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servo/components/layout
bors-servo 5002dff853 Auto merge of #11442 - mitchhentges:87-debug-id, r=KiChjang
Fragment debug_id u16 only exists in debug, prod will format mem address

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Each fragment has a `u16` `debug_id` in debug mode, but no `debug_id` in production to save memory. To format a debug id in production, the address of the empty `debug_id` is displayed.

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<!-- Thank you for contributing to Servo! Please replace each `[ ]` by `[X]` when the step is complete, and replace `__` with appropriate data: -->
- [X] `./mach build -d` does not report any errors
- [X] `./mach test-tidy` does not report any errors
- [X] These changes fix #87 (github issue number if applicable).

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- [X] These changes do not require tests because it looks like it's not possible to mock out `cfg` options in `#[test]`s

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2016-06-04 16:03:59 -05:00
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