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use the right case

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Tshepang Mbambo 2025-05-10 12:32:59 +02:00
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# `TypeFoldable` and `TypeFolder` # `TypeFoldable` and `TypeFolder`
In [a previous chapter], we discussed instantiating binders. This must involves looking at everything inside of a `Early/Binder` In [a previous chapter], we discussed instantiating binders. This involves looking at everything inside of a `Early/Binder`
to find any usages of the bound vars in order to replace them. Binders can wrap an arbitrary rust type `T` not just a `Ty` so to find any usages of the bound vars in order to replace them. Binders can wrap an arbitrary Rust type `T` not just a `Ty` so
how do we implement the `instantiate` methods on the `Early/Binder` types. how do we implement the `instantiate` methods on the `Early/Binder` types.
The answer is a couple of traits: The answer is a couple of traits:
@ -20,7 +20,7 @@ that takes a type as input and returns a new type as a result. `TypeFoldable` in
`TypeFolder` `fold_foo` methods on itself, giving the `TypeFolder` access to its contents (the `TypeFolder` `fold_foo` methods on itself, giving the `TypeFolder` access to its contents (the
types, regions, etc that are contained within). types, regions, etc that are contained within).
You can think of it with this analogy to the iterator combinators we have come to love in rust: You can think of it with this analogy to the iterator combinators we have come to love in Rust:
```rust,ignore ```rust,ignore
vec.iter().map(|e1| foo(e2)).collect() vec.iter().map(|e1| foo(e2)).collect()