Test attempt to remove nonexistent tag

tests/test-tags

@@ -85,6 +85,10 b" hg tag --remove -d '1000000 0' bar"
 hg tip
 hg tags
 
+echo '% remove nonexistent tag'
+hg tag --remove -d '1000000 0' foobar
+hg tip
+
 # test tag rank
 cd ..
 hg init t3

tests/test-tags.out

@@ -49,6 +49,14 b' date: Mon Jan 12 13:46:40 1970 +0'
 summary:     Removed tag bar
 
 tip                                5:57e1983b4a60
+% remove nonexistent tag
+abort: tag foobar does not exist
+changeset:   5:57e1983b4a60
+tag:         tip
+user:        test
+date:        Mon Jan 12 13:46:40 1970 +0000
+summary:     Removed tag bar
+
 tip                                5:d8bb4d1eff25
 bar                                0:b409d9da318e
 1 files updated, 0 files merged, 0 files removed, 0 files unresolved