This commit introduces the syntax for negative implementations of traits
as shown below:
`impl !Trait for Type {}`
cc #13231
Part of RFC rust-lang/rfcs#127
r? @nikomatsakis
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| .. | ||
| auxiliary | ||
| bench | ||
| codegen | ||
| compile-fail | ||
| compile-fail-fulldeps | ||
| debuginfo | ||
| pretty | ||
| run-fail | ||
| run-make | ||
| run-pass | ||
| run-pass-fulldeps | ||
| run-pass-valgrind | ||