facet-rs / facet / 20020324958

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fix: support generic types in container-level proxy attribute

Fixes #1109 - Generic type parameters were not available inside the
`&const { }` block used to generate the ProxyDef. This caused errors
like "can't use generic parameters from outer item" when using
`#[facet(proxy = GenericProxy<T>)]` on a generic struct.

The fix moves the proxy conversion functions to an inherent impl block
outside the const block, where generic parameters are in scope. The
functions are then referenced via `Self::method` from within the const.

Added `__private` module to facet-core with FacetString type alias.
Added regression test for generic structs with generic proxy types.

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