019 auto discharge branch constructor

✓ Passing This code compiles and runs correctly.

Code

~import app/fs
~event check-file { path: []const u8 }
| result []const u8
~check-file = app/fs:open(path)
| opened _ => result "file exists"  // obligation should be auto-discharged before returning!
~check-file(path: "test.txt")
| result _ |> _

input.kz

Actual

Opening file: test.txt
Closing file (auto-discharged)

Expected output

Opening file: test.txt
Closing file (auto-discharged)

Imported Files

const std = @import("std");
const File = struct { handle: i32 };

~pub event open { path: []const u8 }
| opened *File<opened!>

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

~pub event close { file: *File<!opened> }

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

fs.kz

Test Configuration

MUST_RUN

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