Improve warning about purecopy of strings with properties

* src/alloc.c (purecopy): Show the offending string with the
warning about removing its text properties.

1 files changed, 2 insertions, 1 deletions

diff --git a/src/alloc.c b/src/alloc.c
index 9ac3ad84131..050097c905a 100644
--- a/src/alloc.c
+++ b/src/alloc.c
@@ -5353,7 +5353,8 @@ purecopy (Lisp_Object obj)
   else if (STRINGP (obj))
     {
       if (XSTRING (obj)->intervals)
-        message ("Dropping text-properties when making string pure");
+        message_with_string ("Dropping text-properties while making string `%s' pure",
+                             obj, true);
       obj = make_pure_string (SSDATA (obj), SCHARS (obj),
                               SBYTES (obj),
                               STRING_MULTIBYTE (obj));