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recommend unpretty=hir alongside unpretty=hir-tree #1804

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Oct 18, 2023
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recommend unpretty=hir alongside unpretty=hir-tree #1804

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9 changes: 8 additions & 1 deletion src/hir-debugging.md
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# 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.
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