Explain how to dump HIR

2018-02-07 07:08:58 +00:00 · 2018-02-07 07:08:58 +00:00 · de6afbc261
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@ -10,6 +10,14 @@ been desugared away (as an example, `for` loops are converted into a

 This chapter covers the main concepts of the HIR.

+You can view the HIR representation of your code by passing the
+`-Zunpretty=hir-tree` flag to rustc, for example by setting the `RUSTFLAGS`
+environment variable:
+
+```
+RUSTFLAGS=-Zunpretty=hir-tree cargo build
+```
+
 ### Out-of-band storage and the `Crate` type

 The top-level data-structure in the HIR is the `Crate`, which stores