SimpleSelectorSequence constructor
      
      SimpleSelectorSequence(
    
    
- SimpleSelector simpleSelector,
- SourceSpan? span, [
- int combinator = TokenKind.COMBINATOR_NONE
Implementation
SimpleSelectorSequence(this.simpleSelector, SourceSpan? span,
    [this.combinator = TokenKind.COMBINATOR_NONE])
    : super(span);