Index: class.c
==================================================================
--- class.c
+++ class.c
@@ -1051,19 +1051,20 @@
             if(!macstack) ParseError("Empty macro stack\n");
             n=tokenv-1;
             nxttok();
             if(n<0 || macstack->n<=n || !macstack->args[n]) ParseError("Cannot edit nonexistent argument %u\n",n+1);
             if(macstack->args[n]->t&(TF_MACRO|TF_EOF)) ParseError("Invalid edit token\n");
+            free(macstack->args[n]->str);
             macstack->args[n]->t=tokent;
             macstack->args[n]->v=tokenv;
             macstack->args[n]->str=0;
             if(*tokenstr) {
               macstack->args[n]->str=strdup(tokenstr);
               if(!macstack->args[n]->str) fatal("Allocation failed\n");
             }
           } else {
-            if(!(tokent&TF_NAME) || tokenv!=OP_STRING) ParseError("String literal expected\n");
+            if(!(tokent&TF_NAME) || tokenv!=OP_STRING) ParseError("Numeric or string literal expected\n");
             n=glohash[look_hash_mac()].id;
             if(n<0xC000 || n>MAX_MACRO+0xC000-1 || !macros[n-0xC000]) ParseError("Undefined macro: {%s}\n",tokenstr);
             nxttok();
             n-=0xC000;
             if(macros[n]->t&(TF_MACRO|TF_EOF)) ParseError("Invalid edit token\n");