I've been assuming that feature flags can also be used "within" the standard library to control which features are already being used. That is helpful when stabilizing a part of the API, to test if that API is viable enough for whatveer the standard library does with it.
But it turns out that, e.g., core::fmt::float can call MaybeUninit::get_mut without enabling the relevant feature flag. That seems like a bug to me.
I've been assuming that feature flags can also be used "within" the standard library to control which features are already being used. That is helpful when stabilizing a part of the API, to test if that API is viable enough for whatveer the standard library does with it.
But it turns out that, e.g.,
core::fmt::floatcan callMaybeUninit::get_mutwithout enabling the relevant feature flag. That seems like a bug to me.