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link to chapter referred to 

This made it look the the topic was covered in the chapter just before
the current one.
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Tshepang Mbambo 2025-05-10 12:21:56 +02:00
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src/ty-fold.md
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@ -1,6 +1,6 @@
# `TypeFoldable` and `TypeFolder` # `TypeFoldable` and `TypeFolder`
In the 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 must 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.
@ -102,3 +102,4 @@ calls
[ty_for_param](https://github.com/rust-lang/rust/blob/75ff3110ac6d8a0259023b83fd20d7ab295f8dd6/src/librustc_middle/ty/subst.rs#L552-L587) [ty_for_param](https://github.com/rust-lang/rust/blob/75ff3110ac6d8a0259023b83fd20d7ab295f8dd6/src/librustc_middle/ty/subst.rs#L552-L587)
and all that does is index into the list of substitutions with the index of the `Param`. and all that does is index into the list of substitutions with the index of the `Param`.
[a previous chapter]: ty_module/instantiating_binders.md