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Dec 31, 2019
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Add a bit about def path #548

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6 changes: 6 additions & 0 deletions src/hir.md
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Expand Up @@ -102,6 +102,12 @@ sorts of identifiers in active use:
[`BodyId`]: https://doc.rust-lang.org/nightly/nightly-rustc/rustc/hir/struct.BodyId.html
[`NodeId`]: https://doc.rust-lang.org/nightly/nightly-rustc/syntax/ast/struct.NodeId.html

We also have an internal map to go from `DefId` to what’s called "Def path". "Def path" is like a
module path but a bit more rich. For example, it may be `crate::foo::MyStruct` that identifies
this definition uniquely. It’s a bit different than a module path because it might include a type
parameter `T`, which you can't write in normal rust, like `crate::foo::MyStruct::T`. These are used
in incremental compilation.

### The HIR Map

Most of the time when you are working with the HIR, you will do so via
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