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Add test for `DEF(@)`

--- a/src/asm/symbol.c

+++ b/src/asm/symbol.c

@@ -314,7 +314,13 @@

 {

 	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);

--- /dev/null

+++ b/test/asm/pc-def.asm

@@ -1,0 +1,5 @@

+IF DEF(@)

+	PRINTT "defined\n"

+ELSE

+	PRINTT "not defined\n"

+ENDC

--- /dev/null

+++ b/test/asm/pc-def.err

@@ -1,0 +1,2 @@

+ERROR: pc-def.asm(1):

+    '@' is not allowed as argument to the DEF function