Matthias Krüger 07342828c5
Rollup merge of #89610 - guswynn:must_use_future, r=wesleywiser
warn on must_use use on async fn's

As referenced in #78149

This only works on `async` fn's for now, I can also look into if I can get `Box<dyn Future>` and `impl Future` working at this level (hir)
2021-11-17 15:57:56 +01:00
..
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