007 binding annotations

// Test: Binding annotations in continuations
// Verifies parser accepts annotations on binding variables: | branch binding[annotation] |>

const std = @import("std");

~event get-data {}
| result i32

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

// This event mutates the value it receives via a pointer
~event mutate-and-print { ptr: *i32 }

~proc mutate-and-print|zig {
    ptr.* += 1;  // Mutate the value
    std.debug.print("Value: {d}\n", .{ptr.*});
}

// Test: Using [mutable] annotation so we can pass a mutable pointer
~get-data()
| result r[mutable] |> mutate-and-print(ptr: &r)