Here's a proposal for a syntactic modification to the draft proposal that
removes explicit type parameters from functions, and just uses generic types
directly (e.g., the new interface types):
https://github.com/golang/go/issues/39669
This would go a long way toward simplifying the syntax and avoiding most of the
worst issues with parens, while otherwise being essentially identical to the
draft proposal.
Here's a sample:
// draft proposal
func StrAndPrint(type L interface{}, T Stringer)(labels []L, vals []T) { ... }
// GT proposal
func StrAndPrint(labels []type, vals []Stringer) { ... }
you just use the generic types like any other existing types! `type` can be
used for an unconstrained generic type -- otherwise you use the generic
interface type for constrained types.
- Randy
> On Jun 17, 2020, at 4:45 PM, google via golang-nuts
> <golang-nuts@googlegroups.com> wrote:
>
> On Wednesday, 17 June 2020 07:54:02 UTC+10, Alexander Morozov wrote:
> I wonder how could we avoid this confusion (apart from using different
> brackets :)).
>
> I know the brackets discussion has been had before, and that there are some
> technical, and non-technical reasons why parentheses were settled on, but
> this really illustrates the limitations of relying on a single delimiter for
> everything. Even in function declarations, where it's most clear what's
> intended, there is a significant cognitive load placed on the reader to
> determine what's happening, possibly involving backtracking to a previous set
> of parens. I think underestimating the impact of the syntax on reading
> comprehension would be a grave mistake, and I strongly believe that the
> proliferation of parens hurts here.
>
> This second draft removes some other concerns that I had with the contracts
> design, but this syntax issue has stuck out to me as problematic since the
> start, and I can't shake it.
>
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