004 impl with delegation

// Test 430_004: Abstract with Both Default AND Impl (Explicit Delegation)
// When an abstract event has BOTH a default and an override:
// - The override becomes the public handler
// - The default is renamed to `event.default`
// - Override EXPLICITLY calls `.default` to delegate
//
// This is the "wrap and extend" pattern with NO MAGIC!

~import "$std/io"

// Define abstract event
~[abstract] event process { name: []const u8 }
| result { message: []const u8 }

// Default implementation: just returns the name
~process = result { message: name }

// Override: EXPLICITLY calls process.default, then passes through
// Note: process.default - not process! No magic, no confusion.
~process = process.default(name: name) | result r |> result { message: r.message }

// Test it
~process(name: "delegation works!")
| result r |> io.println(message: r.message)