code: function(walk) {
          if (this.emitText(walk)) return;
          if (this.tryInputText(walk)) return;
          if (this.tryInputRegex(walk)) return;
          if (this.tryInputTextWithDefault(walk)) return;
          if (this.trySelectMenu(walk)) return;
          var _super = InlineCompiler.prototype.emitNormal.bind(this);
          return _super(walk);
        }
docs: Span-level controls are recognized after the initial set of Rho inline
  elements, just before the generic `emitNormal` method.