1 files changed, 8 insertions, 1 deletions
diff --git a/setup.c b/setup.c
index 820ed05b27..5048252d78 100644
--- a/setup.c
+++ b/setup.c
@@ -197,19 +197,26 @@ const char *prefix_pathspec(const char *prefix, int prefixlen, const char *elt)
 		}
 		if (*copyfrom == ')')
 			copyfrom++;
+	} else if (!elt[1]) {
+		/* Just ':' -- no element! */
+		return NULL;
 	} else {
 		/* shorthand */
 		for (copyfrom = elt + 1;
 		     *copyfrom && *copyfrom != ':';
 		     copyfrom++) {
 			char ch = *copyfrom;
+
+			if (!is_pathspec_magic(ch))
+				break;
 			for (i = 0; i < ARRAY_SIZE(pathspec_magic); i++)
 				if (pathspec_magic[i].mnemonic == ch) {
 					magic |= pathspec_magic[i].bit;
 					break;
 				}
 			if (ARRAY_SIZE(pathspec_magic) <= i)
-				break;
+				die("Unimplemented pathspec magic '%c' in '%s'",
+				    ch, elt);
 		}
 		if (*copyfrom == ':')
 			copyfrom++;