Tracking issue for super_or_self_in_global_path compatibility lint

[petrochenkov]

What is this lint about

Paths starting with self or super are relative by definition, "global" prefix :: used to indicate absolute paths doesn't make sense on them.
However, older versions of the compiler sometimes (e.g. in imports) accepted and ignored such prefixes:

mod m {
    struct S;

    use ::self::S as Z; // <- was accepted, the path was still interpreted as relative despite `::`
}

#32403 fixed this oversight.

How to fix this warning/error

Remove :: from the path starting with ::self or ::super.

Current status

• Fix issue: Global paths in use directives can begin with super or self #32225  #32403 introduces the super_or_self_in_global_path lint as warn-by-default
• Make sufficiently old or low-impact compatibility lints deny-by-default #36894 makes the super_or_self_in_global_path lint deny-by-default
• Turn sufficiently old compatibility lints into hard errors #42136 makes the super_or_self_in_global_path lint a hard error