On 05/03/2025 23:10, Rowan Tommins [IMSoP] wrote:
This is roughly what happened with Closures themselves in PHP: first, decide that "$foo = function(){};" will be valid syntax, and define Closure as the type of $foo; then over time, add additional behaviour to the Closure class, the ability to add __invoke() hooks on other classes, etc
Sorry to double-post, but Generators are probably a better example: you can write "$foo = yield $bar;" and there are well-defined semantics; on the outside of the function, we represent the state as a Generator object, and make it implement Iterable to explain how foreach() works; but on the inside of the function, it's pure magic: $bar is passed into an invisible channel, an invisible continuation is created, and when it's resumed another invisible channel passes out a value for $foo.
-- Rowan Tommins [IMSoP]
