zuzu-rust 0.4.0

Rust implementation of ZuzuScript
Documentation 
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from std/result import Result;
from std/marshal import dump, load;
from test/more import *;

class LoggedResult extends Result {
	let String context := "unset";

	method describe () {
		return context _ ":" _ ( self.is_ok() ? "ok" : "err" );
	}
}

let ok_result := Result.ok(42);
ok( ok_result instanceof Result, "Result.ok returns a Result" );
is( ok_result.is_ok(), true, "ok result reports is_ok" );
is( ok_result.is_err(), false, "ok result reports not is_err" );
is( ok_result.value(), 42, "ok result stores value" );
is( ok_result.error(), null, "ok result has null error" );
is( ok_result.unwrap(), 42, "ok result unwrap returns value" );
like(
	exception( function () { ok_result.unwrap_err(); } ).to_String(),
	/unwrap_err/,
	"ok result unwrap_err throws",
);

let err_result := Result.err("boom");
ok( err_result instanceof Result, "Result.err returns a Result" );
is( err_result.is_ok(), false, "err result reports not is_ok" );
is( err_result.is_err(), true, "err result reports is_err" );
is( err_result.value(), null, "err result has null value" );
is( err_result.error(), "boom", "err result stores error" );
is( err_result.unwrap_err(), "boom", "err result unwrap_err returns error" );
like(
	exception( function () { err_result.unwrap(); } ).to_String(),
	/unwrap/,
	"err result unwrap throws",
);

let subclass_ok := LoggedResult.ok("done");
subclass_ok{context} := "worker";
ok( subclass_ok instanceof LoggedResult, "Result.ok is late-bound" );
ok( subclass_ok instanceof Result, "Result subclass remains a Result" );
is( subclass_ok.describe(), "worker:ok", "subclass method works" );

let subclass_err := LoggedResult.err("bad");
subclass_err{context} := "marshal";
ok( subclass_err instanceof LoggedResult, "Result.err is late-bound" );
is( subclass_err.describe(), "marshal:err", "err subclass method works" );

let loaded_ok := load( dump(ok_result) );
is( typeof loaded_ok, "Result", "Result survives marshal round trip" );
is( loaded_ok.unwrap(), 42, "marshalled Result keeps value" );

let loaded_subclass := load( dump(subclass_err) );
is(
	typeof loaded_subclass,
	"LoggedResult",
	"Result subclass survives marshal round trip",
);
is(
	loaded_subclass.unwrap_err(),
	"bad",
	"marshalled Result subclass keeps error",
);
is(
	loaded_subclass.describe(),
	"marshal:err",
	"marshalled Result subclass keeps subclass state",
);

done_testing();