testsuite: Test cases, all except issue-5216 xfailed #10027
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Fix 10021 This PR proposes a fix for rust-lang#10021. The problem is similar to the one that `@mikerite` described in rust-lang#9505. The compiler is generating an empty substitution for a call, even though the type of `Self` seems to be needed for a predicate. In `@mikerite's` case, the call was to [`IntoFuture::into_future`](https://doc.rust-lang.org/std/future/trait.IntoFuture.html#tymethod.into_future). In this case, the call is to [`Try::branch`](https://doc.rust-lang.org/std/ops/trait.Try.html#tymethod.branch). The proposed fix is to verify that the parameter whose type is changing has an index within the substitution. The strikes me as a reasonable approach, since if the check were to fail, the following code would be a no-op: https://github.com/rust-lang/rust-clippy/blob/4c123a06ba3c2ec17d3a4dfa251dccdc5368b712/clippy_lints/src/methods/unnecessary_to_owned.rs#L420-L428 Like `@mikerite's` original solution, this solution turns ICEs into false negatives. changelog: fix `unnecessary_to_owned` false positive involving `Try::branch`
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