Auto merge of #18355 - servo:no-fmt, r=emilio

Reduce usage of fmt in serialization and error reporting

`format!` and `write!` create a somewhat-heavyweight `Formatting` struct and use dynamic dispatch to call into impls of `Dispaly` and related traits. The former also allocates an intermediate string that is sometimes unnecessary.

I started looking into this from https://bugzilla.mozilla.org/show_bug.cgi?id=1355599, but I expect the impact there will be small to insignificant. It might be a slightly less so on parsing (error reporting).

<!-- Reviewable:start -->
---
This change is [<img src="https://reviewable.io/review_button.svg" height="34" align="absmiddle" alt="Reviewable"/>](https://reviewable.io/reviews/servo/servo/18355)
<!-- Reviewable:end -->
This commit is contained in:
bors-servo 2017-09-04 13:14:44 -05:00 committed by GitHub
commit c60dd53210
27 changed files with 328 additions and 365 deletions

View file

@ -26530,7 +26530,7 @@
"testharness"
],
"mozilla/calc.html": [
"5b3ea33205a9f2404bd6976a2c7f6fc451be8e96",
"4f65929cacf623da2d3e310a6663d6165a1b0cdc",
"testharness"
],
"mozilla/canvas.initial.reset.2dstate.html": [