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-rw-r--r--Src/builtin.c4
1 files changed, 4 insertions, 0 deletions
diff --git a/Src/builtin.c b/Src/builtin.c
index 110a264f2..11324a0cd 100644
--- a/Src/builtin.c
+++ b/Src/builtin.c
@@ -1250,6 +1250,10 @@ bin_fc(char *nam, char **argv, char *ops, int func)
while (*argv && equalsplit(*argv, &s)) {
Asgment a = (Asgment) zhalloc(sizeof *a);
+ if (!**argv) {
+ zwarnnam(nam, "invalid replacement pattern: =%s", s, 0);
+ return 1;
+ }
if (!asgf)
asgf = asgl = a;
else {