Add test for DEF(@)

src/asm/symbol.c

@@ -314,7 +314,13 @@ uint32_t sym_GetConstantValue(char *s)
 {
 	struct sSymbol *psym = sym_FindSymbol(s);
 
-	if (psym != NULL) {
+	if (psym == pPCSymbol) {
+		if (pCurrentSection->nOrg == -1)
+			yyerror("Expected constant PC but section is not fixed");
+		else
+			return pPCSymbol->nValue;
+
+	} else if (psym != NULL) {
 		if (psym->nType & SYMF_CONST)
 			return getvaluefield(psym);
 

test/asm/pc-def.asm

@@ -0,0 +1,5 @@
+IF DEF(@)
+	PRINTT "defined\n"
+ELSE
+	PRINTT "not defined\n"
+ENDC

test/asm/pc-def.err

@@ -0,0 +1,2 @@
+ERROR: pc-def.asm(1):
+    '@' is not allowed as argument to the DEF function