test_must_fail git rev-parse blob-tag^{tree}
'
+test_expect_success 'ref^{tag}' '
+ test_must_fail git rev-parse HEAD^{tag} &&
+ git rev-parse commit-tag >expected &&
+ git rev-parse commit-tag^{tag} >actual &&
+ test_cmp expected actual
+'
+
test_expect_success 'ref^{/.}' '
git rev-parse master >expected &&
git rev-parse master^{/.} >actual &&