docs: function() {
      if (/^#\{/.test(this.input)) {
        var match = this.bracketExpression(1);
        this.consume(match.end + 1);
        var tok = this.tok('interpolation', match.src);
        this.tokens.push(tok);
        this.incrementColumn(2); // '#{'
        this.assertExpression(match.src);
  
        var splitted = match.src.split('\n');
        var lines = splitted.length - 1;
        this.incrementLine(lines);
        this.incrementColumn(splitted[lines].length + 1); // + 1 → '}'
        return true;
      }
    }