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lint: do not allow assignment-expression for constant-expression

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It's a funny idea to do something like 'case a = 13:', but since any
compiler will reject this code, there is no point in lint supporting it.

No functional change since everywhere the grammar allows a constant
expression, there is no ambiguity where an assignment could be
interpreted differently.
This commit is contained in:
rillig 2021-03-07 20:06:48 +00:00
parent 53af70edc9
commit 36dd5d7651
1 changed files with 4 additions and 4 deletions
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8
usr.bin/xlint/lint1/cgram.y
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@ -1,5 +1,5 @@
%{
/* $NetBSD: cgram.y,v 1.168 2021/03/07 19:57:46 rillig Exp $ */
/* $NetBSD: cgram.y,v 1.169 2021/03/07 20:06:48 rillig Exp $ */
/*
* Copyright (c) 1996 Christopher G. Demetriou. All Rights Reserved.
@ -35,7 +35,7 @@
#include <sys/cdefs.h>
#if defined(__RCSID) && !defined(lint)
__RCSID("$NetBSD: cgram.y,v 1.168 2021/03/07 19:57:46 rillig Exp $");
__RCSID("$NetBSD: cgram.y,v 1.169 2021/03/07 20:06:48 rillig Exp $");
#endif
#include <limits.h>
@ -1787,8 +1787,8 @@ declaration_list:
}
;
constant_expr:
expr %prec T_COMMA {
constant_expr: /* C99 6.6 */
expr %prec T_ASSIGN {
$$ = $1;
}
;