Jack Huey 86e23cc9f1
Rollup merge of #81636 - LingMan:slice_not_vec, r=petrochenkov
Directly use `Option<&[T]>` instead of converting from `Option<&Vec<T>>` later on

```@rustbot``` modify labels +C-cleanup +T-compiler
2021-02-02 16:01:45 -05:00
..
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