refset, replace: adjust diagnostic for unsupported object.

* lib.c (refset, replace): Word the bad object diagnostic in
terms of it not being a modifiable sequence. This covers
cases when the object is something abstractly iterable, like
a range. We don't want to say that it's not a sequence.

1 files changed, 2 insertions, 2 deletions

diff --git a/lib.c b/lib.c
index e38197ee..5a47d19d 100644
--- a/lib.c
+++ b/lib.c
@@ -13564,7 +13564,7 @@ val refset(val seq, val ind, val newval)
     }
     /* fallthrough */
   default:
-    type_mismatch(lit("refset: ~s is not a sequence"), seq, nao);
+    type_mismatch(lit("refset: ~s is not a modifiable sequence"), seq, nao);
   }
   return newval;
 }
@@ -13593,7 +13593,7 @@ val replace(val seq, val items, val from, val to)
       return replace_obj(seq, items, from, to);
     /* fallthrough */
   default:
-    type_mismatch(lit("~a: ~s is not a sequence"), self, seq, nao);
+    type_mismatch(lit("~a: ~s is not a modifiable sequence"), self, seq, nao);
   }
 }