Yog Script (.ys, .yns) analyzed: its lexer, parser and syntax tree, names resolved, the class index model — what the build and the editors read a source with.
namespace System;
/// A built-in type's members (`string`'s are `String`'s): what code sees of
/// them is the declaration, what runs is the runtime's companion, a static
/// method each with the value first (`s.ToUpper()` is `String.ToUpper(s)`).
public sealed class Host : Attribute {}