docs: function handleYield(forms) {
      var yieldType = sl.valueOf(forms[0]); // "yield" or "yield*"
      if (forms.length != 2) {
        forms.error(yieldType + " expects a single expression");
      }
      this.indent += this.indentSize;
      this.transpileSubExpressions(forms);
  
      var generated = sl.generated();
      generated.push([yieldType, " ", forms[1]]);
      this.indent -= this.indentSize;
      return generated;
  }