002 if else discharges then drops

✓ Passing This code compiles and runs correctly.

Code

// Asymmetric manual/auto discharge across an `if` is VALID. `| else |> close(f)`
// discharges f manually; `| then |> _` discharges it automatically — `_` is an
// explicit "auto-discharge me", so the compiler inserts close(f) on the then arm.
// Whichever branch runs, f is closed: no leak. This is the else-manual / then-auto
// mirror of 330_024_if_hybrid_manual_auto (then-manual / else-auto).
~import std/control
~import app/fs
const condition = true;
~app/fs:open(path: "test.txt")
| opened f |> std/control:if(condition)
    | then |> _
    | else |> app/fs:close(file: f)

input.kz

Actual

Opening file: test.txt
Closing file

Expected output

Opening file: test.txt
Closing file

Imported Files

// Library module: fs
// Defines filesystem operations with cleanup obligations
// Copied verbatim from 330_022_if_manual_both_branches/fs.kz

const std = @import("std");

// File type with phantom states
const File = struct {
    handle: i32,
};

// Open a file - returns opened! state (requires cleanup)
~pub event open { path: []const u8 }
| opened *File<opened!>

~proc open|zig {
    std.debug.print("Opening file: {s}\n", .{path});
    const allocator = std.heap.page_allocator;
    const f = allocator.create(File) catch unreachable;
    f.* = File{ .handle = 42 };
    return .{ .opened = f };
}

// Close a file - CONSUMES opened! state (disposes the resource)
~pub event close { file: *File<!opened> }

~proc close|zig {
    std.debug.print("Closing file\n", .{});
}

fs.kz

Test Configuration

MUST_RUN

← multiple errors 003 if then discharges else drops strict →