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Document -Zunpretty=thir-tree (#1128) 

* document -Zunpretty=thir-tree

* Update position/wording
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Smittyvb 2021-05-13 14:51:43 -04:00 committed by GitHub
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src/thir.md
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@ -39,6 +39,9 @@ will be allocated. Dropping this arena will result in the THIR being destroyed,
which is useful to keep peak memory in check. Having a THIR representation of
all bodies of a crate in memory at the same time would be very heavy.
You can get a debug representation of the THIR by passing the `-Zunpretty=thir-tree` flag
to `rustc`.
[thir-docs]: https://doc.rust-lang.org/nightly/nightly-rustc/rustc_mir_build/thir/index.html
[`thir::Expr`]: https://doc.rust-lang.org/nightly/nightly-rustc/rustc_mir_build/thir/struct.Expr.html
[`build_thir`]: https://doc.rust-lang.org/nightly/nightly-rustc/rustc_mir_build/thir/fn.build_thir.html