DIP19: Remove comma operator from D and provision better syntactic support for tuples
chadjoan at __spam.is.bad__gmail.com
Sat Oct 6 11:20:54 PDT 2012
On 09/24/2012 11:55 AM, Caligo wrote:
> If tuples are ever introduced, I hope parentheses will not be used.
> I would prefer something like this:
Not using parentheses: a possibly valid idea!
Using angle brackets: never going to happen.
People HATE angle brackets. There is extremely good justification for
this hatred, because C++ already stepped on that landmine and suffered
dearly for it.
If you were to use angle brackets, then I would try to do this:
Which way should this be parsed?
It might be a value tuple of type <bool,bool>
or it might be a declaration: d is of type <bool, typeof(c)>
It is very easy to create cases with angle brackets that are
syntactically ambiguous and make it impossible to parse code as a
context-free-grammar. It is harder, but probably possible, to create
cases where such a syntax is also completely ambiguous semantically too.
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