code: func (p *Parser) ScanIgnoreWhitespace() (tok Token, pos Pos, lit string) {
  	for {
  		tok, pos, lit = p.Scan()
  		if tok == WS || tok == COMMENT {
  			continue
  		}
  		return
  	}
  }
docs: // ScanIgnoreWhitespace scans the next non-whitespace and non-comment token.