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Forbid sign modifier in floating types

--- a/types.c

+++ b/types.c

@@ -139,7 +139,7 @@

 			goto two_or_more;

 		type = FLOAT;

 		if (tp->c_signed || tp->c_unsigned)

-			goto check_sign;

+			goto invalid_sign;

 		break;

 	case DOUBLE:

 		if (type)

@@ -149,7 +149,7 @@

 		else if (type == LONG)

 			type = LDOUBLE;

 		if (tp->c_signed || tp->c_unsigned)

-			goto check_sign;

+			goto invalid_sign;

 		break;

 	case UNSIGNED:

 		if (tp->c_unsigned)

@@ -166,7 +166,7 @@

 		tp->c_signed = 1;

 check_sign:	switch (type) {

-		case VOID: case BOOL: case STRUCT: case UNION: case ENUM:

+		case VOID: case BOOL: case FLOAT: case DOUBLE: case LDOUBLE:

 			goto invalid_sign;

 		}

 		break;