Empty ranges -L,+0 and -L,-0 are nonsensical in the context of blame yet
they are accepted (in fact, both are interpreted as -L1,Y where Y is
end-of-file). Report them as invalid.

Signed-off-by: Eric Sunshine <sunsh...@sunshineco.com>
---
 line-range.c        | 2 +-
 t/annotate-tests.sh | 4 ++--
 2 files changed, 3 insertions(+), 3 deletions(-)

diff --git a/line-range.c b/line-range.c
index a816951..69e8d6b 100644
--- a/line-range.c
+++ b/line-range.c
@@ -21,7 +21,7 @@ static const char *parse_loc(const char *spec, nth_line_fn_t 
nth_line,
         * for 20 lines, or "-L <something>,-5" for 5 lines ending at
         * <something>.
         */
-       if (1 < begin && (spec[0] == '+' || spec[0] == '-')) {
+       if (1 <= begin && (spec[0] == '+' || spec[0] == '-')) {
                num = strtol(spec + 1, &term, 10);
                if (term != spec + 1) {
                        if (!ret)
diff --git a/t/annotate-tests.sh b/t/annotate-tests.sh
index d7807df..e422a9e 100644
--- a/t/annotate-tests.sh
+++ b/t/annotate-tests.sh
@@ -185,7 +185,7 @@ test_expect_success 'blame -L Y,X (undocumented)' '
        check_count -L6,3 B 1 B1 1 B2 1 D 1
 '
 
-test_expect_failure 'blame -L ,+0' '
+test_expect_success 'blame -L ,+0' '
        test_must_fail $PROG -L,+0 file
 '
 
@@ -201,7 +201,7 @@ test_expect_success 'blame -L X,+N' '
        check_count -L3,+4 B 1 B1 1 B2 1 D 1
 '
 
-test_expect_failure 'blame -L ,-0' '
+test_expect_success 'blame -L ,-0' '
        test_must_fail $PROG -L,-0 file
 '
 
-- 
1.8.3.4.1120.gc240c48

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