From 11f29baf25df2cfb4ca30cc20b67d06f1ccaea64 Mon Sep 17 00:00:00 2001
From: Ayaz Hafiz <ayaz@rwx.com>
Date: Thu, 21 Apr 2022 09:34:40 -0400
Subject: [PATCH] Add note about output

---
 compiler/unify/src/unify.rs | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/compiler/unify/src/unify.rs b/compiler/unify/src/unify.rs
index a8ceea4cd6..10738f6382 100644
--- a/compiler/unify/src/unify.rs
+++ b/compiler/unify/src/unify.rs
@@ -274,6 +274,9 @@ pub fn unify_pool(
     }
 }
 
+/// Set `ROC_PRINT_UNIFICATIONS` in debug runs to print unifications as they start and complete as
+/// a tree to stderr.
+/// NOTE: Only run this on individual tests! Run on multiple threads, this would clobber each others' output.
 #[cfg(debug_assertions)]
 fn debug_print_unified_types(subs: &mut Subs, ctx: &Context, opt_outcome: Option<&Outcome>) {
     static mut UNIFICATION_DEPTH: usize = 0;