Add documentation for some rustc_type_ir macros - #2939
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| ### `GenericTypeVisitable` & `TypeVisitable_Generic` | ||
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| While ostensibly similar due to their names, they implement two different | ||
| visiting systems. | ||
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| - `TypeVisitable_Generic` means: derive the ordinary `TypeVisitable` trait | ||
| generically over an `Interner`. | ||
| - `GenericTypeVisitable` means: derive the separate `GenericTypeVisitable` trait | ||
| used by non-nightly consumers such as rust-analyzer. | ||
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| As such a struct or enum can derive both `TypeVisitable_Generic` and | ||
| `GenericTypeVisitable` |
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instead explain this as part of the first paragraph of the GenericTypeVisitable section?
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| `rustc_type_ir` makes _heavy_ use of a few macros, in particular | ||
| - [`Lift_Generic`][lift_generic] | ||
| - [`TypeFoldable_Generic`][typefoldable_generic] | ||
| - [`TypeVisitable_Generic`][typevisitable_generic] | ||
| - [`GenericTypeVisitable`][generictypevisitable] | ||
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| Of which primarily exist to reduce the amount of boilerplate otherwise | ||
| required to implement `TypeFoldable`, `TypeVisitable` and `Lift`. |
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| `rustc_type_ir` makes _heavy_ use of a few macros, in particular | |
| - [`Lift_Generic`][lift_generic] | |
| - [`TypeFoldable_Generic`][typefoldable_generic] | |
| - [`TypeVisitable_Generic`][typevisitable_generic] | |
| - [`GenericTypeVisitable`][generictypevisitable] | |
| Of which primarily exist to reduce the amount of boilerplate otherwise | |
| required to implement `TypeFoldable`, `TypeVisitable` and `Lift`. | |
| `rustc_type_ir` makes _heavy_ use of a few macros, in particular | |
| - [`Lift_Generic`][lift_generic] | |
| - [`TypeFoldable_Generic`][typefoldable_generic] | |
| - [`TypeVisitable_Generic`][typevisitable_generic] | |
| - [`GenericTypeVisitable`][generictypevisitable] | |
| Of which primarily exist to reduce the amount of boilerplate otherwise | |
| required to implement `TypeFoldable`, `TypeVisitable` and `Lift`. | |
| These macros are variants of the `TypeFoldable`, `TypeVisitable`, and `Lift` macros used in crates which have access to the `TyCtxt` using a `I: Interner` parameter instead of `TyCtxt`. |
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| Derives `rustc_type_ir::GenericTypeVisitable<V>` for a struct or enum. | ||
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| This is the non-nightly, rust-analyzer-facing generic traversal. The visitor |
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| This is the non-nightly, rust-analyzer-facing generic traversal. The visitor | |
| This a separate more general traversal trait purely used by rust-analyzer. The visitor |
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…ts earlier in the doc & reword GenericTypeVisitable intro
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Adds documentation for;
TypeVisitable_GenericTypeFoldable_GenericLift_GenericGenericTypeVisitableFollows a formulaic "<macro_name>, description, how to use it, What its expansion does"