The `export default` statement can be used to declare a default export
value for a module. The value for `export default` can be an arbitrary
expression, it must not refer to a local variable.

When using the export list syntax, the alias "default" can be used to
designate the default export.

-- File test-default-expr.uc --
export default 7 * 21;
-- End --

-- File test-default-func.uc --
export default function() {
	return "Hello, world!";
};
-- End --

-- File test-default-alias.uc --
let a = 1, b = 2, c = 3;

export { a, b as default, c };
-- End --

-- Testcase --
import def1 from "./files/test-default-expr.uc";
import def2 from "./files/test-default-func.uc";
import def3 from "./files/test-default-alias.uc";

print([ def1, def2(), def3 ], "\n");
-- End --

-- Args --
-R
-- End --

-- Expect stdout --
[ 147, "Hello, world!", 2 ]
-- End --