Auto merge of #1880 - hyd-dev:rustup, r=oli-obk

Move `#[allow(unreachable_code)]` in `tests/run-pass/generator.rs`

The warning now appears on `yield 2;` instead of `drop(x)`: https://github.com/rust-lang/miri/runs/3429959882?check_suite_focus=true#step:8:265

`yield 2;` seems indeed unreachable so I adjusted the `#[allow]`.

rust-version

@@ -1 +1 @@
-f66e825f73d2bd7f8a763b723983850f891985b0
+c4be230b4a30eb74e3a3908455731ebc2f731d3d

tests/run-pass/generator.rs

@@ -93,8 +93,8 @@ fn basic() {
         if b { return; }
         #[allow(unused)]
         let x = never();
-        yield 2;
         #[allow(unreachable_code)]
+        yield 2;
         drop(x);
     });