Auto merge of #112083 - scottmcm:simpler-range-next, r=thomcc

bors · bors · commit f505fa973d34 · 2023-05-30T07:27:05.000Z
Make `TrustedStep` require `Copy`

All the implementations of the trait already are `Copy`, and this seems to be enough to simplify the implementations enough to make the MIR inliner willing to inline basics like `Range::next`.

r? `@thomcc`
diff --git a/tests/pass/shims/time-with-isolation2.stdout b/tests/pass/shims/time-with-isolation2.stdout
@@ -1 +1 @@
-The loop took around 13s
+The loop took around 7s

Original file line number	Diff line number	Diff line change
`@@ -1 +1 @@`
`1`		`-The loop took around 13s`
	`1`	`+The loop took around 7s`