perl6/doc/lib/X/Syntax/Self/WithoutObject

(title)  class X::Syntax::Self::WithoutObject

    class X::Syntax::Self::WithoutObject does X::Syntax { }

Syntax error thrown when self is referenced in a place where no invocant is available. For example

    self

in the mainline dies with

    ===SORRY!===
    'self' used where no object is available