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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| .. | ||
| check | ||
| coherence | ||
| astconv.rs | ||
| collect.rs | ||
| diagnostics.rs | ||
| lib.rs | ||
| rscope.rs | ||
| variance.rs | ||