From b9c07aef27ce10c6860a85a7ee229589396bb6f4 Mon Sep 17 00:00:00 2001
From: Richard Feldman <oss@rtfeldman.com>
Date: Wed, 11 May 2022 10:51:27 -0400
Subject: [PATCH] Use internal_error over unreachable

---
 compiler/mono/src/copy.rs | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/compiler/mono/src/copy.rs b/compiler/mono/src/copy.rs
index 420736842d..afcb34c7d0 100644
--- a/compiler/mono/src/copy.rs
+++ b/compiler/mono/src/copy.rs
@@ -629,6 +629,7 @@ fn deep_copy_type_vars<'a>(
 mod test {
     use super::deep_copy_type_vars;
     use bumpalo::Bump;
+    use roc_error_macros::internal_error;
     use roc_module::symbol::Symbol;
     use roc_types::subs::{
         Content, Content::*, Descriptor, Mark, OptVariable, Rank, Subs, SubsIndex, Variable,
@@ -732,7 +733,7 @@ mod test {
             RigidAbleVar(name, Symbol::UNDERSCORE) => {
                 assert_eq!(subs[*name].as_str(), "a");
             }
-            it => unreachable!("{:?}", it),
+            it => internal_error!("{:?}", it),
         }
     }
 }