010 variable naming nested scopes

// BUG: Emitter generates duplicate variable names in nested scopes
//
// ISSUE: When multiple events are called at different nesting levels,
// the emitter reuses names like `result_2`, causing Zig compilation errors:
//   "error: redeclaration of local constant 'result_2'"
//
// EXPECTED: Each event call should get a unique variable name,
// even across different scopes (loops, branches, etc.)
//
// MINIMAL REPRODUCTION: Two void events followed by a branched event,
// called at different nesting levels.

const std = @import("std");

~import std/control

// Void event (no branches)
~event step-one {}

~proc step-one|zig {
    // Does nothing, just tests void event handling
}

// Another void event
~event step-two {}

~proc step-two|zig {
    // Does nothing
}

// Event with a result branch
~event get-value {}
| value i32

~proc get-value|zig {
    return .{ .value = 42 };
}

// Event to print
~event print-value { v: i32 }

~proc print-value|zig {
    std.debug.print("{d}\n", .{v});
}

// Main flow - triggers the naming collision
// The structure: void event -> branched event -> loop -> void event -> branched event
// Both branched events generate `result_N` with same N

~step-one()
~get-value()
| value v1 |> print-value(v: v1) |> for(0..2)
    ! each _ |> step-two() |> get-value()
        | value v2 |> print-value(v: v2)