code: function getInterpolation() {
    const type = NodeType.InterpolationType;
    const token = tokens[pos];
    const line = token.ln;
    const column = token.col;
    let content = [];
  
    // Skip `#{`:
    pos += 2;
  
    while (pos < tokensLength &&
        tokens[pos].type !== TokenType.RightCurlyBracket) {
      const body = getArgument();
      if (typeof body.content === 'string') content.push(body);
      else content = content.concat(body);
    }
  
    const end = getLastPosition(content, line, column, 1);
  
    // Skip `}`:
    pos++;
  
    return newNode(type, content, line, column, end);
  }
docs: Get node with an interpolated variable
  @return {Array} `['interpolation', x]`