RaCoCo result: Red::AST::IsDefined

# Red::AST::IsDefined 64.2%

    use Red::AST;
    use Red::AST::Unary;
    #| Represents "is defined" operation
    #| usualy defined as:
    #| type IS NULL
    unit class Red::AST::IsDefined does Red::AST;

    has $.col is required;

    method new(::?CLASS:U: $col) {
        self.bless: :$col
    }

    method returns { Bool }

    method args { $!col }

    method not {
        Red::AST::Not.new: self
    }

    method find-column-name {
        $!col.name
    }

    method find-value {
        $!col
    }

    method gist { "{$!col.gist}.defined" }