mirror
/
rustc-dev-guide
mirror of https://github.com/rust-lang/rustc-dev-guide.git
1
0
Fork 0
Code Issues Packages Projects Releases Wiki Activity

Small improvements (#936) 

* Fix typo errros -> errors

* an -> a

* hir -> hir()
This commit is contained in:
Santiago Pastorino 2020-10-27 18:34:28 +00:00 committed by GitHub
parent bec1897ef7
commit c2606a6d54
1 changed files with 5 additions and 5 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

10
src/hir.md
View File

@ -87,7 +87,7 @@ Most of the time when you are working with the HIR, you will do so via
the **HIR Map**, accessible in the tcx via [`tcx.hir()`] (and defined in
the [`hir::map`] module). The [HIR map] contains a [number of methods] to
convert between IDs of various kinds and to lookup data associated
with an HIR node.
with a HIR node.
[`tcx.hir()`]: https://doc.rust-lang.org/nightly/nightly-rustc/rustc_middle/ty/struct.TyCtxt.html#method.hir
[`hir::map`]: https://doc.rust-lang.org/nightly/nightly-rustc/rustc_middle/hir/map/index.html
@ -96,7 +96,7 @@ with an HIR node.
For example, if you have a [`DefId`], and you would like to convert it
to a [`NodeId`], you can use
[`tcx.hir.as_local_node_id(def_id)`][as_local_node_id]. This returns
[`tcx.hir().as_local_node_id(def_id)`][as_local_node_id]. This returns
an `Option<NodeId>` – this will be `None` if the def-id refers to
something outside of the current crate (since then it has no HIR
node), but otherwise returns `Some(n)` where `n` is the node-id of the
@ -105,13 +105,13 @@ definition.
[`NodeId`]: https://doc.rust-lang.org/nightly/nightly-rustc/rustc_ast/node_id/struct.NodeId.html
[as_local_node_id]: https://doc.rust-lang.org/nightly/nightly-rustc/rustc_middle/hir/map/struct.Map.html#method.as_local_node_id
Similarly, you can use [`tcx.hir.find(n)`][find] to lookup the node for a
Similarly, you can use [`tcx.hir().find(n)`][find] to lookup the node for a
[`NodeId`]. This returns a `Option<Node<'tcx>>`, where [`Node`] is an enum
defined in the map; by matching on this you can find out what sort of
node the node-id referred to and also get a pointer to the data
itself. Often, you know what sort of node `n` is – e.g. if you know
that `n` must be some HIR expression, you can do
[`tcx.hir.expect_expr(n)`][expect_expr], which will extract and return the
[`tcx.hir().expect_expr(n)`][expect_expr], which will extract and return the
[`&hir::Expr`][Expr], panicking if `n` is not in fact an expression.
[find]: https://doc.rust-lang.org/nightly/nightly-rustc/rustc_middle/hir/map/struct.Map.html#method.find
@ -120,7 +120,7 @@ that `n` must be some HIR expression, you can do
[Expr]: https://doc.rust-lang.org/nightly/nightly-rustc/rustc_hir/struct.Expr.html
Finally, you can use the HIR map to find the parents of nodes, via
calls like [`tcx.hir.get_parent_node(n)`][get_parent_node].
calls like [`tcx.hir().get_parent_node(n)`][get_parent_node].
[get_parent_node]: https://doc.rust-lang.org/nightly/nightly-rustc/rustc_middle/hir/map/struct.Map.html#method.get_parent_node