Semantic difference between `use foo` and `use foo::self`

1

I noticed that rustfmt does not reduce use foo::{self} or use foo::self to use foo. When I brought this up in an issue, I was told that the semantics vary between the two forms. I can't find any resource that talks about this - is anyone able to please explain what the difference is?

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2

use foo imports foo for all three namespaces (macros, values, types) whereas use foo::{self} only imports foo from the types namespace.

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