[Nickle] sort of a bug

Keith Packard nickle@nickle.org
Fri, 14 Feb 2003 18:43:20 -0800

Around 16 o'clock on Feb 14, Bart Massey wrote:

> (BTW, is right-to-left
> associativity a part of the C standard, or just standard in
> implementations?  I need to purchase or steal a copy of the
> C90 spec someday...)

Yes.  Otherwise *a++ would "do the wrong thing".

> Second, s far as making the precedence of making postfix !
> different precedence from prefix !, it should just require a
> %prec declaration, no?

Nope.  Yacc maps the %prec to the operator token; the same token always 
yields the same precedence.  I looked at the y.output file in some detail 
to verify this.

> But this precedence change doesn't really fix the problem:
> in Nickle ~x++ will still be handled the same way as in C,
> which is arguably a bug because darnit, it should be
> left-to-right.

Why is left-to-right "correct"?  It's just a matter of implicit