julia

e39c4d8d - Add a builtin that allows specifying which iterate method to use (#33356)

Add a builtin that allows specifying which iterate method to use (#33356) When using the Casette mechanism to intercept calls to _apply, a common strategy is to rewrite the function argument to properly consider the context and then falling back to regular _apply. However, as showin in https://github.com/jrevels/Cassette.jl/issues/146, this strategy is insufficient as the _apply itself may recurse into various `iterate` calls which are not properly tracked. This is an attempt to resolve this problem with a minimal performance penalty. Attempting to duplicate the _apply logic in julia, would lead to code that is very hard for inference (and nested Cassette passes to understand). In contrast, this simply adds a version of _apply that takes `iterate` as an explicit argument. Cassette and similar tools can override this argument and provide a function that properly allows the context to recurse through the iteration, while still allowing inference to take advantage of the special handling of _apply for simple cases. Also change the lowering of splatting to use this new intrinsic directly, thus fixing #26001.