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Add "hir::Ty
and ty::Ty
" section
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@ -102,6 +102,21 @@ impl LateLintPass<'_> for MyStructLint {
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}
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```
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## `hir::Ty` and `ty::Ty`
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We've been talking about [`ty::Ty`][middle_ty] this whole time without addressing [`hir::Ty`][hir_ty], but the latter
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is also important to understand.
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`hir::Ty` would represent *what* an user wrote, while `ty::Ty` would understand the meaning of it (because it has more
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information).
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**Example: `fn foo(x: u32) -> u32 { x }`**
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Here the HIR sees the types without "thinking" about them, it knows that the function takes an `u32` and returns
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an `u32`. But at the `ty::Ty` level the compiler understands that they're the same type, in-depth lifetimes, etc...
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you can use the [`hir_ty_to_ty`][hir_ty_to_ty] function to convert from a `hir::Ty` to a `ty::Ty`
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## Useful Links
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Below are some useful links to further explore the concepts covered
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@ -124,3 +139,6 @@ in this chapter:
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[Ty]: https://doc.rust-lang.org/nightly/nightly-rustc/rustc_middle/ty/struct.Ty.html
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[TyKind]: https://doc.rust-lang.org/nightly/nightly-rustc/rustc_middle/ty/enum.TyKind.html
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[TypeckResults]: https://doc.rust-lang.org/nightly/nightly-rustc/rustc_middle/ty/struct.TypeckResults.html
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[middle_ty]: https://doc.rust-lang.org/beta/nightly-rustc/rustc_middle/ty/struct.Ty.html
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[hir_ty]: https://doc.rust-lang.org/beta/nightly-rustc/rustc_hir/struct.Ty.html
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[hir_ty_to_ty]: https://doc.rust-lang.org/beta/nightly-rustc/rustc_hir_analysis/fn.hir_ty_to_ty.html
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