031 tap binding substitution

✓ Passing This code compiles and runs correctly.

Code

~import "$std/taps"
~import "$app/fs"
~tap(app.fs:open -> *)
| opened f |> app.fs:log_open(handle: f.handle)
~app.fs:open(path: "test.txt")
| opened _ |> _
pub fn main() void {}

input.kz

Expected

Opening file
TAP: Observed file open!
Closing file (auto-discharged)

Actual

Opening file
TAP: Observed file open!
Closing file (auto-discharged)

Imported Files

// Library module: fs
// Phantom-tracked file operations for testing tap binding substitution

const std = @import("std");

const File = struct { handle: i32 };

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

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

// Close - the ONLY consumer of [!opened]
~pub event close { file: *File[!opened] }

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

// A logging event for taps - receives the file handle from tap binding
~pub event log_open { handle: i32 }

~proc log_open {
    std.debug.print("TAP: Observed file open!\n", .{});
}

fs.kz

Test Configuration

MUST_RUN

← 030 taps with auto discharge 032 nested for scopes →