This reverts the relevant bits from #21746 so that style and dependencies can
build with stable.
This is important because:
* `selectors` is a published crate.
* Gecko compiles with stable (more or less).
I reviewed that PR under the assumption that the union feature was stable, since
untagged unions are stable since 1.19, but turns out that smallvec uses non-Copy
types in unions, which are still unstable.
This leaves the union feature used on Servo, so that it gets testing, taking
advantage of features being additive.
This cherry-picks servo/servo#21788.
We had a mix of 0.6.2 and 0.6.5 (which is the current release),
this unifies to the latest version. It also enables the union
feature which removes the discriminant, reducing memory usage.
This cherry-picks servo/servo#21746.
…acilities. r=emilio@crisal.io.
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Source-Repo: https://github.com/servo/servo
Source-Revision: be804a8155b0a942324f564df569233d13c97dcd
--HG--
extra : subtree_source : https%3A//hg.mozilla.org/projects/converted-servo-linear
extra : subtree_revision : b0279b7e9545549faa5975eae219c30085005d8d
…r=manishearth.
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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: -->
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Source-Repo: https://github.com/servo/servo
Source-Revision: c68bc0c145db3ce2df49023c1525dbfc7d252153
--HG--
extra : subtree_source : https%3A//hg.mozilla.org/projects/converted-servo-linear
extra : subtree_revision : 4a112bb31f31eaef4d39084f794b74ad24355518
Emilio Cobos Álvarez
Andre Bogus
Bastien Orivel
Julian Seward