From de6afbc2613583d31797e8b33e85b09f6b6cda89 Mon Sep 17 00:00:00 2001
From: Phil Ellison <phil.j.ellison@gmail.com>
Date: Wed, 7 Feb 2018 07:08:58 +0000
Subject: [PATCH] Explain how to dump HIR

---
 src/hir.md | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/src/hir.md b/src/hir.md
index 52fda69a..12933687 100644
--- a/src/hir.md
+++ b/src/hir.md
@@ -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