Before I try to solve this myself, it feels like a problem which probably already has a good solution in a crate somewhere.... Does anyone know of a crate that helps with the following?:

I want to manipulate nested types in a Path, as part of a proc_macro

E.g. if I have parsed Option<Box<Foo>> as a syn::Path I would like to:

• iterate into it getting: Option<Box<Foo>>, Box<Foo>, Foo
• update the innermost type to give Option<Box<Bar>>

This could get arbitrarily complicated when associated types (nice to have) and types with multiple generics (need) come into play.

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