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Renamed -> token from PTR to INDIR

There was a name conflict with the type operator PTR, and PTR was not a good
name for this token, because could be misunderstand with * operator.

--- a/expr.c

+++ b/expr.c

@@ -62,10 +62,10 @@

 			expect(')');

 			gen_call();

 			continue;

-		case '.': fp = gen_field; goto expect_iden;

-		case PTR: fp = gen_ptr; goto expect_iden;

-		case INC: fp = gen_postinc; goto next;

-		case DEC: fp = gen_postdec; goto next;

+		case '.':   fp = gen_field; goto expect_iden;

+		case INDIR: fp = gen_ptr; goto expect_iden;

+		case INC:   fp = gen_postinc; goto next;

+		case DEC:   fp = gen_postdec; goto next;

 		default:

 			fputs("leaving static void postfix(void)", stderr);

 			return;

--- a/lex.c

+++ b/lex.c

@@ -120,7 +120,7 @@

 	switch (c = getc(yyin)) {

 	case '-': return DEC;

-	case '>': return PTR;

+	case '>': return INDIR;

 	case '=': return SUB_EQ;

 	default:

 		ungetc(c, yyin);

--- a/tokens.h

+++ b/tokens.h

@@ -18,7 +18,7 @@

 	UNSIGNED, SIGNED,

 	/* other tokens */

 	IDEN = 128, CONSTANT, SIZEOF,

-	PTR, INC, DEC, SHL, SHR,

+	INDIR, INC, DEC, SHL, SHR,

 	LE, GE, EQ, NE, AND, OR,

 	MUL_EQ, DIV_EQ, MOD_EQ, ADD_EQ, SUB_EQ, AND_EQ,

 	XOR_EQ, OR_EQ, SHL_EQ, SHR_EQ,