From a57fe846e8bb7d6d53ab4bc953025fde30e1770f Mon Sep 17 00:00:00 2001
From: Jordan Harband <ljharb@gmail.com>
Date: Thu, 23 Nov 2017 10:02:37 -0600
Subject: [PATCH] [Fix] `set -u`: ensure `NVM_USE_OUTPUT` is always set.

Fixes #1671.
---
 nvm.sh                                                         | 3 ++-
 "test/fast/Running \"nvm use system\" should work as expected" | 2 +-
 2 files changed, 3 insertions(+), 2 deletions(-)

diff --git a/nvm.sh b/nvm.sh
index be5e733..c68c44d 100644
--- a/nvm.sh
+++ b/nvm.sh
@@ -508,7 +508,7 @@ nvm_remote_versions() {
   local NVM_LS_REMOTE_IOJS_EXIT_CODE
   NVM_LS_REMOTE_IOJS_EXIT_CODE=0
   local NVM_LS_REMOTE_IOJS_OUTPUT
-  NVM_LS_REMOTE_IOJS_OUTPUT=
+  NVM_LS_REMOTE_IOJS_OUTPUT=''
   if [ -z "${NVM_LTS-}" ] && ( \
     [ -z "${NVM_FLAVOR-}" ] || [ "${NVM_FLAVOR-}" = "${NVM_IOJS_PREFIX}" ] \
   ); then
@@ -2902,6 +2902,7 @@ nvm() {
         command rm -f "$NVM_DIR/current" && ln -s "$NVM_VERSION_DIR" "$NVM_DIR/current"
       fi
       local NVM_USE_OUTPUT
+      NVM_USE_OUTPUT=''
       if [ $NVM_USE_SILENT -ne 1 ]; then
         if nvm_is_iojs_version "$VERSION"; then
           NVM_USE_OUTPUT="Now using io.js $(nvm_strip_iojs_prefix "$VERSION")$(nvm_print_npm_version)"
diff --git "a/test/fast/Running \"nvm use system\" should work as expected" "b/test/fast/Running \"nvm use system\" should work as expected"
index b268205..be3d11e 100755
--- "a/test/fast/Running \"nvm use system\" should work as expected"	
+++ "b/test/fast/Running \"nvm use system\" should work as expected"	
@@ -1,6 +1,6 @@
 #!/bin/sh
 
-set -ex
+set -eux
 
 cleanup() {
   unset -f nvm_has_system_node nvm_print_npm_version