It is correct. For example, this code (admittedly a contrived example, just to illustrate the point) compiles in 1.82 but not in 1.83: trait OptionExt {

It is correct. For example, this code (admittedly a contrived example, just to illustrate the point) compiles in 1.82 but not in 1.83: trait OptionExt { fn get_or_insert_default(); } impl<T> OptionExt for Option<T> { fn get_or_insert_default() {} } fn main() { Option::<()>::get_or_insert_default(); } The reason is that `get_or_insert_default` was added to the stdlib in 1.83, and takes a different number of arguments, so it clashes with the user-defined one here.