024 for deeply nested

// Test: ~for deeply nested in continuation hierarchy
//
// This tests the case where ~for is several levels deep in nested continuations,
// like in the nbody benchmark:
//   | result1 |> event1() | done |> event2() | result2 |> for(...) | each |> ...
//
// The transform must search RECURSIVELY through nested continuations.

~import "$std/io"
~import "$std/control"

const std = @import("std");

// Event chain to create deep nesting
~event step1 {}
| done {}

~proc step1 {
    return .{ .done = .{} };
}

~event step2 {}
| done {}

~proc step2 {
    return .{ .done = .{} };
}

// Main flow: for is nested 2 levels deep
~step1()
| done |> step2()
    | done |> for(0..3)
        | each |> std.io:println(text: "iteration")
        | done |> std.io:println(text: "done")