diff --git a/lib/spack/spack/test/cmd/view.py b/lib/spack/spack/test/cmd/view.py
index b4f3275172..a52edff786 100644
--- a/lib/spack/spack/test/cmd/view.py
+++ b/lib/spack/spack/test/cmd/view.py
@@ -85,6 +85,31 @@ def test_view_extension_remove(
     assert not os.path.exists(os.path.join(viewpath, 'bin', 'extension1'))
 
 
+def test_view_extension_conflict(
+        tmpdir, builtin_mock, mock_archive, mock_fetch, config,
+        install_mockery):
+    install('extendee')
+    install('extension1@1.0')
+    install('extension1@2.0')
+    viewpath = str(tmpdir.mkdir('view'))
+    view('symlink', viewpath, 'extension1@1.0')
+    output = view('symlink', viewpath, 'extension1@2.0')
+    assert 'Package conflict detected' in output
+
+
+def test_view_extension_conflict_ignored(
+        tmpdir, builtin_mock, mock_archive, mock_fetch, config,
+        install_mockery):
+    install('extendee')
+    install('extension1@1.0')
+    install('extension1@2.0')
+    viewpath = str(tmpdir.mkdir('view'))
+    view('symlink', viewpath, 'extension1@1.0')
+    view('symlink', viewpath, '-i', 'extension1@2.0')
+    with open(os.path.join(viewpath, 'bin', 'extension1'), 'r') as fin:
+        assert fin.read() == '1.0'
+
+
 def test_view_extension_global_activation(
         tmpdir, builtin_mock, mock_archive, mock_fetch, config,
         install_mockery):
diff --git a/var/spack/repos/builtin.mock/packages/extension1/package.py b/var/spack/repos/builtin.mock/packages/extension1/package.py
index c9837bde90..e36b2ad1d1 100644
--- a/var/spack/repos/builtin.mock/packages/extension1/package.py
+++ b/var/spack/repos/builtin.mock/packages/extension1/package.py
@@ -39,5 +39,5 @@ class Extension1(Package):
 
     def install(self, spec, prefix):
         mkdirp(prefix.bin)
-        with open(os.path.join(prefix.bin, 'extension1'), 'w+'):
-            pass
+        with open(os.path.join(prefix.bin, 'extension1'), 'w+') as fout:
+            fout.write(str(spec.version))
diff --git a/var/spack/repos/builtin.mock/packages/extension2/package.py b/var/spack/repos/builtin.mock/packages/extension2/package.py
index 5616d4c3ca..de2545250b 100644
--- a/var/spack/repos/builtin.mock/packages/extension2/package.py
+++ b/var/spack/repos/builtin.mock/packages/extension2/package.py
@@ -40,5 +40,5 @@ class Extension2(Package):
 
     def install(self, spec, prefix):
         mkdirp(prefix.bin)
-        with open(os.path.join(prefix.bin, 'extension2'), 'w+'):
-            pass
+        with open(os.path.join(prefix.bin, 'extension2'), 'w+') as fout:
+            fout.write(str(spec.version))