Add OriginalType<A, B>: 'pin
bound to projected type
#188
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Fixes #185
Usually, Rust will automatically add lifetime bounds of the form
T: 'lifetime
when required (e.g. when a struct contains&'a T
).However, the compiler will not normalize associated types before
performing this analysis, which can require users to manually add
T: 'lifetime
bounds themselves. When this happens with a generatedprojection struct, the user has no ability to add such a bound, since
they cannot name the 'pin lifetime.
This PR adds a bound of the form
OriginalType<A, B>: 'pin
to thewhere
clause of the generated projection types. This ensures thatany type parameters which need to outlive 'pin will do so, without
unnecessarily constraining other type parameters.