Add a test to ensure Fuse stays covariant#72902
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Rollup of 5 pull requests Successful merges: - rust-lang#72704 (Remote testing fixes) - rust-lang#72820 (InstCombine: Don't optimize `&mut *x` into `x`) - rust-lang#72848 (Correct generic parameter ordering in error note for E0747) - rust-lang#72902 (Add a test to ensure Fuse stays covariant) - rust-lang#72921 (Add assert to Vec with_capacity docs) Failed merges: r? @ghost
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When #70502 attempted to specialize the data types in
Fuse, one of the problems we found was that it broke variance. This was also realized whenFusewas first added, #35656 (diff), but now this PR adds a test so we don't forget again.