common/rust: vendor test-case 1.2
Summary:
Fixes an annoying lint warning:
```
error: unneeded unit expression
--> interpreter/src/pattern.rs:692:5
|
692 | #[test_case(PhantomData::< TargetPattern >; "parsing TargetPattern")]
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
|
= note: `-D clippy::unused-unit` implied by `-D warnings`
= help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#unused_unit
= note: this error originates in the attribute macro `test_case` (in Nightly builds, run with -Z macro-backtrace for more info)
```
Reviewed By: ndmitchell
Differential Revision:
D31108216
fbshipit-source-id:
ab298b965a0b19643cfbdb16565c76a60ab25876