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recommend `unpretty=hir` alongside `unpretty=hir-tree` 

Previously at no point in the guide did we recommend `unpretty=hir`, only `unpretty=hir-tree`. I'm not sure if `unpretty=hir-tree` existed when this chapter was written.

related: https://github.com/rust-lang/rustc-dev-guide/issues/1159

I noticed that there's some duplicate information between here and the parent chapter https://rustc-dev-guide.rust-lang.org/hir.html I may try to merge https://rustc-dev-guide.rust-lang.org/hir-debugging.html into its parent in another PR.
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Ethan Brierley 2023-10-10 17:13:05 +01:00 committed by Michael Goulet
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src/hir-debugging.md
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@ -1,6 +1,13 @@
# HIR Debugging
The `-Z unpretty=hir-tree` flag will dump out the HIR.
Use the `-Z unpretty=hir` flag to produce a human-readable representation of the HIR.
For cargo projects this can be done with `cargo rustc -- -Z unpretty=hir`.
This output is useful when you need to see at a glance how your code was desugared and transformed
during AST lowering.
For a full `Debug` dump of the data in the HIR, use the `-Z unpretty=hir-tree` flag.
This may be useful when you need to see the full structure of the HIR from the perspective of the
compiler.
If you are trying to correlate `NodeId`s or `DefId`s with source code, the
`-Z unpretty=expanded,identified` flag may be useful.