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Small modifications in parameters of expect and open_file

Declared parameters as register.

--- a/lex.c

+++ b/lex.c

@@ -181,7 +181,7 @@

 	return 0;

 }

-void expect(unsigned char tok)

+void expect(register unsigned char tok)

 {

 	if (yytoken != tok)

 		error("unexpected %s", yytext);

@@ -188,7 +188,7 @@

 	next();

 }

-void open_file(const char *file)

+void open_file(register const char *file)

 {

 	if (yyin != NULL)

 		fclose(yyin);