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Drop unstable `Option::contains`, `Result::contains`, `Result::contains_err` This is a proposal to drop the three functions `Option::contains`, `Result::contains` and `Result::contains_err`. The discovery of `Option::is_some_with`/`Result::is_ok_with`/`Result::is_err_with` in https://github.com/rust-lang/rust/pull/93051 obviates the need for these methods (non-stabilization tracked in https://github.com/rust-lang/rust/issues/62358). An additional benefit of change is that it avoids spurious error messages in IDEs, when `contains` is supplied by a third-party library:  |
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| .. | ||
| alloc | ||
| backtrace@07872f28cd | ||
| core | ||
| panic_abort | ||
| panic_unwind | ||
| portable-simd | ||
| proc_macro | ||
| profiler_builtins | ||
| rtstartup | ||
| rustc-std-workspace-alloc | ||
| rustc-std-workspace-core | ||
| rustc-std-workspace-std | ||
| std | ||
| stdarch@b655243782 | ||
| test | ||
| unwind | ||
