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 library type the runtime implements by hand (.NET's own `[Intrinsic]`):
/// its declaration is what code sees, its Java is the runtime's, not the
/// compiler's.
public sealed class Intrinsic : Attribute {}