052 escape field name mismatch

const std = @import("std");
const File = struct { handle: i32 };
~event open { path: []const u8 }
| opened *File<opened!>
~proc open|zig {
    std.debug.print("opened: {s}\n", .{path});
    const f = std.heap.page_allocator.create(File) catch unreachable;
    f.* = File{ .handle = 42 };
    return .{ .opened = f };
}
~event close { file: *File<!opened> }
~proc close|zig {
    std.debug.print("closed\n", .{});
    std.heap.page_allocator.destroy(file);
}
~event get-resource { path: []const u8 }
| got *File<opened!>
~get-resource = open(path)
| opened f => got f
~get-resource(path: "test.txt")
| got r |> close(file: r)