Stabilize the `map`/`value` methods on `ControlFlow` And fix the stability attribute on the `pub use` in `core::ops`. libs-api in https://github.com/rust-lang/rust/issues/75744#issuecomment-2231214910 seemed reasonably happy with naming for these, so let's try for an FCP. Summary: ```rust impl<B, C> ControlFlow<B, C> { pub fn break_value(self) -> Option<B>; pub fn map_break<T>(self, f: impl FnOnce(B) -> T) -> ControlFlow<T, C>; pub fn continue_value(self) -> Option<C>; pub fn map_continue<T>(self, f: impl FnOnce(C) -> T) -> ControlFlow<B, T>; } ``` Resolves #75744 ``@rustbot`` label +needs-fcp +t-libs-api -t-libs --- Aside, in case it keeps someone else from going down the same dead end: I looked at the `{break,continue}_value` methods and tried to make them `const` as part of this, but that's disallowed because of not having `const Drop`, so put it back to not even unstably-const.
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