1 files changed, 6 insertions, 0 deletions
diff --git a/string.c b/string.c
index 153fcc59b7..386c460740 100644
--- a/string.c
+++ b/string.c
@@ -7793,6 +7793,9 @@ rb_str_split_m(int argc, VALUE *argv, VALUE str)
     else if (!(spat = rb_fs_check(spat))) {
 	rb_raise(rb_eTypeError, "value of $; must be String or Regexp");
     }
+    else {
+        rb_warn("$; is set to non-nil value");
+    }
     if (split_type != awk) {
 	if (BUILTIN_TYPE(spat) == T_STRING) {
 	    rb_encoding *enc2 = STR_ENC_GET(spat);
@@ -9918,6 +9921,9 @@ rb_fs_setter(VALUE val, ID id, VALUE *var)
 		 "value of %"PRIsVALUE" must be String or Regexp",
 		 rb_id2str(id));
     }
+    if (!NIL_P(val)) {
+        rb_warn("non-nil $; will be deprecated");
+    }
     *var = val;
 }