class Sass::Script::Parser

def try_op_before_interp(op, prev = nil)
  return unless @lexer.peek && @lexer.peek.type == :begin_interpolation
  wb = @lexer.whitespace?(op)
  str = Script::String.new(Lexer::OPERATORS_REVERSE[op.type])
  str.line = @lexer.line
  interp = Script::Interpolation.new(prev, str, nil, wb, !:wa, :originally_text)
  interp.line = @lexer.line
  interpolation(interp)
end