updated for version 7.2.331

Problem:    Can't interrupt "echo list" for a very long list.
Solution:   Call line_breakcheck() in list_join().

src/eval.c

@@ -6475,6 +6475,7 @@ list_join(gap, l, sep, echo, copyID)
 	vim_free(tofree);
 	if (s == NULL)
 	    return FAIL;
+	line_breakcheck();
     }
     return OK;
 }