class X::Syntax::NegatedPair does X::Syntax { }
Thrown if a colonpair illegally has a value, for example :!a(1).
This is an error because the ! negation implies that the value is False.
A typical error message from this class is Argument not allowed on negated pair with key 'a'.
Returns the key of the pair that caused the error.
class X::Attribute::Undeclared
class X::Channel::ReceiveOnClosed
class X::Channel::SendOnClosed
class X::Composition::NotComposable
class X::Constructor::Positional
class X::DateTime::TimezoneClash
class X::Declaration::Scope::Multi
class X::Inheritance::NotComposed
class X::Inheritance::Unsupported
class X::Method::InvalidQualifier
class X::Method::Private::Permission
class X::Method::Private::Unqualified
class X::Numeric::CannotConvert
class X::Numeric::DivideByZero
class X::Parameter::MultipleTypeConstraints
class X::Parameter::Placeholder
class X::Parameter::WrongOrder
class X::Placeholder::Mainline
class X::Proc::Async::AlreadyStarted
class X::Proc::Async::BindOrUse
class X::Proc::Async::CharsOrBytes
class X::Proc::Async::MustBeStarted
class X::Proc::Async::OpenForWriting
class X::Proc::Async::TapBeforeSpawn
class X::Promise::CauseOnlyValidOnBroken
class X::Scheduler::CueInNaNSeconds
class X::Signature::Placeholder
class X::Syntax::Augment::WithoutMonkeyTyping
class X::Syntax::Comment::Embedded
class X::Syntax::InfixInTermPosition
class X::Syntax::Number::RadixOutOfRange
class X::Syntax::Regex::Adverb
class X::Syntax::Regex::SolitaryQuantifier
class X::Syntax::Self::WithoutObject
class X::Syntax::Signature::InvocantMarker
class X::Syntax::Term::MissingInitializer
class X::Syntax::Variable::Match
class X::Syntax::Variable::Numeric
class X::Syntax::Variable::Twigil
class X::Temporal::InvalidFormat
class X::TypeCheck::Assignment
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