code: function() {
        this.context.aliases.blockHelperMissing = 'helpers.blockHelperMissing';
  
        var params = ["depth0"];
        this.setupParams(0, params);
  
        var current = this.topStack();
        params.splice(1, 0, current);
  
        this.source.push("if (!" + this.lastHelper + ") { " + current + " = blockHelperMissing.call(" + params.join(", ") + "); }");
      }
docs: [ambiguousBlockValue]  On stack, before: hash, inverse, program, value Compiler value, before: lastHelper=value of last found helper, if any On stack, after, if no lastHelper: same as [blockValue] On stack, after, if lastHelper: value