Make String#chomp! raise ArgumentError for 2+ arguments if string is empty

String#chomp! returned nil without checking the number of passed
arguments in this case.

1 files changed, 1 insertions, 1 deletions

diff --git a/string.c b/string.c
index 9da5708964..cfad52d2e3 100644
--- a/string.c
+++ b/string.c
@@ -9689,7 +9689,7 @@ rb_str_chomp_bang(int argc, VALUE *argv, VALUE str)
 {
     VALUE rs;
     str_modifiable(str);
-    if (RSTRING_LEN(str) == 0) return Qnil;
+    if (RSTRING_LEN(str) == 0 && argc < 2) return Qnil;
     rs = chomp_rs(argc, argv);
     if (NIL_P(rs)) return Qnil;
     return rb_str_chomp_string(str, rs);