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Passing This code compiles and runs correctly.
Code
// PINS: a tap's binding substitutes into the tap body's arguments —
// `f.handle` reads a field of the observed return through the tap binding.
// Tap-on-bare-return spelling grounded on 310_006 (`tap(hello -> *): v |> ...`).
~import std/taps
~import app/fs
~tap(app/fs:open -> *): f |> app/fs:log-open(f.handle)
~app/fs:open(path: "test.txt")
Supporting 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 tor open { path: string } -> *File<opened!>
~proc open|zig {
std.debug.print("Opening file\n", .{});
const f = std.heap.page_allocator.create(File) catch unreachable;
f.* = File{ .handle = 42 };
return f;
}
// Close - the ONLY consumer of <!opened>
~pub tor close { file: *File<!opened> }
~proc close|zig {
std.debug.print("Closing file (auto-discharged)\n", .{});
}
// A logging event for taps - receives the file handle from tap binding
~pub tor log-open { handle: i32 }
~proc log-open|zig {
std.debug.print("TAP: Observed file open!\n", .{});
}
Actual
Opening file
TAP: Observed file open!
Closing file (auto-discharged)
Expected output
Opening file
TAP: Observed file open!
Closing file (auto-discharged)
Flows
flow ~tap click a branch to expand · @labels scroll to their anchor
tap (app/fs: open -> *)
flow ~open click a branch to expand · @labels scroll to their anchor
open (path: "test.txt")
Test Configuration
MUST_RUN