From 756aef6adc14e229a4ef6e7cf0aa132d56a324fe Mon Sep 17 00:00:00 2001
From: Brent Burgoyne <brent47@gmail.com>
Date: Tue, 18 Nov 2014 06:52:44 -0700
Subject: [PATCH 1/3] Instead of returning early, conditionally require actual
 runtime (./_runtime.js)

Fix this error with webpack:

ERROR in ./~/6to5/lib/6to5/transformation/transformers/generators/runtime.js
Module parse failed: /[...]/node_modules/6to5/lib/6to5/transformation/transformers/generators/runtime.js Line 12: Illegal return statement
You may need an appropriate loader to handle this file type.
|
| if (typeof global.regeneratorRuntime === "object") {
  |   return;
  |
}
|
 @ ./~/6to5/lib/6to5/polyfill.js 6:0-59
---
 .../transformers/generators/_runtime.js       | 455 ++++++++++++++++++
 .../transformers/generators/runtime.js        | 448 +----------------
 2 files changed, 457 insertions(+), 446 deletions(-)
 create mode 100644 lib/6to5/transformation/transformers/generators/_runtime.js

diff --git a/lib/6to5/transformation/transformers/generators/_runtime.js b/lib/6to5/transformation/transformers/generators/_runtime.js
new file mode 100644
index 0000000000..f396de8cff
--- /dev/null
+++ b/lib/6to5/transformation/transformers/generators/_runtime.js
@@ -0,0 +1,455 @@
+/**
+* Copyright (c) 2014, Facebook, Inc.
+* All rights reserved.
+*
+* This source code is licensed under the BSD-style license found in the
+* https://raw.github.com/facebook/regenerator/master/LICENSE file. An
+* additional grant of patent rights can be found in the PATENTS file in
+* the same directory.
+*/
+
+var iteratorSymbol = typeof Symbol === "function" && Symbol.iterator || "@@iterator";
+var runtime = global.regeneratorRuntime = exports;
+var hasOwn = Object.prototype.hasOwnProperty;
+
+var wrap = runtime.wrap = function wrap(innerFn, outerFn, self, tryList) {
+  return new Generator(innerFn, outerFn, self || null, tryList || []);
+};
+
+var GenStateSuspendedStart = "suspendedStart";
+var GenStateSuspendedYield = "suspendedYield";
+var GenStateExecuting = "executing";
+var GenStateCompleted = "completed";
+
+// Returning this object from the innerFn has the same effect as
+// breaking out of the dispatch switch statement.
+var ContinueSentinel = {};
+
+// Dummy constructor that we use as the .constructor property for
+// functions that return Generator objects.
+var GF = function GeneratorFunction() {};
+var GFp = function GeneratorFunctionPrototype() {};
+var Gp = GFp.prototype = Generator.prototype;
+(GFp.constructor = GF).prototype =
+  Gp.constructor = GFp;
+
+// Ensure isGeneratorFunction works when Function#name not supported.
+var GFName = "GeneratorFunction";
+if (GF.name !== GFName) GF.name = GFName;
+if (GF.name !== GFName) throw new Error(GFName + " renamed?");
+
+runtime.isGeneratorFunction = function(genFun) {
+  var ctor = genFun && genFun.constructor;
+  return ctor ? GF.name === ctor.name : false;
+};
+
+runtime.mark = function(genFun) {
+  genFun.__proto__ = GFp;
+  genFun.prototype = Object.create(Gp);
+  return genFun;
+};
+
+runtime.async = function(innerFn, outerFn, self, tryList) {
+  return new Promise(function(resolve, reject) {
+    var generator = wrap(innerFn, outerFn, self, tryList);
+    var callNext = step.bind(generator.next);
+    var callThrow = step.bind(generator["throw"]);
+
+    function step(arg) {
+      var info;
+      var value;
+
+      try {
+        info = this(arg);
+        value = info.value;
+      } catch (error) {
+        return reject(error);
+      }
+
+      if (info.done) {
+        resolve(value);
+      } else {
+        Promise.resolve(value).then(callNext, callThrow);
+      }
+    }
+
+    callNext();
+  });
+};
+
+function Generator(innerFn, outerFn, self, tryList) {
+  var generator = outerFn ? Object.create(outerFn.prototype) : this;
+  var context = new Context(tryList);
+  var state = GenStateSuspendedStart;
+
+  function invoke(method, arg) {
+    if (state === GenStateExecuting) {
+      throw new Error("Generator is already running");
+    }
+
+    if (state === GenStateCompleted) {
+      throw new Error("Generator has already finished");
+    }
+
+    while (true) {
+      var delegate = context.delegate;
+      var info;
+
+      if (delegate) {
+        try {
+          info = delegate.iterator[method](arg);
+
+          // Delegate generator ran and handled its own exceptions so
+          // regardless of what the method was, we continue as if it is
+          // "next" with an undefined arg.
+          method = "next";
+          arg = undefined;
+
+        } catch (uncaught) {
+          context.delegate = null;
+
+          // Like returning generator.throw(uncaught), but without the
+          // overhead of an extra function call.
+          method = "throw";
+          arg = uncaught;
+
+          continue;
+        }
+
+        if (info.done) {
+          context[delegate.resultName] = info.value;
+          context.next = delegate.nextLoc;
+        } else {
+          state = GenStateSuspendedYield;
+          return info;
+        }
+
+        context.delegate = null;
+      }
+
+      if (method === "next") {
+        if (state === GenStateSuspendedStart &&
+            typeof arg !== "undefined") {
+          // https://people.mozilla.org/~jorendorff/es6-draft.html#sec-generatorresume
+          throw new TypeError(
+            "attempt to send " + JSON.stringify(arg) + " to newborn generator"
+          );
+        }
+
+        if (state === GenStateSuspendedYield) {
+          context.sent = arg;
+        } else {
+          delete context.sent;
+        }
+
+      } else if (method === "throw") {
+        if (state === GenStateSuspendedStart) {
+          state = GenStateCompleted;
+          throw arg;
+        }
+
+        if (context.dispatchException(arg)) {
+          // If the dispatched exception was caught by a catch block,
+          // then let that catch block handle the exception normally.
+          method = "next";
+          arg = undefined;
+        }
+
+      } else if (method === "return") {
+        context.abrupt("return", arg);
+      }
+
+      state = GenStateExecuting;
+
+      try {
+        var value = innerFn.call(self, context);
+
+        // If an exception is thrown from innerFn, we leave state ===
+        // GenStateExecuting and loop back for another invocation.
+        state = context.done ? GenStateCompleted : GenStateSuspendedYield;
+
+        info = {
+          value: value,
+          done: context.done
+        };
+
+        if (value === ContinueSentinel) {
+          if (context.delegate && method === "next") {
+            // Deliberately forget the last sent value so that we don't
+            // accidentally pass it on to the delegate.
+            arg = undefined;
+          }
+        } else {
+          return info;
+        }
+
+      } catch (thrown) {
+        state = GenStateCompleted;
+
+        if (method === "next") {
+          context.dispatchException(thrown);
+        } else {
+          arg = thrown;
+        }
+      }
+    }
+  }
+
+  generator.next = invoke.bind(generator, "next");
+  generator["throw"] = invoke.bind(generator, "throw");
+  generator["return"] = invoke.bind(generator, "return");
+
+  return generator;
+}
+
+Gp[iteratorSymbol] = function() {
+  return this;
+};
+
+Gp.toString = function() {
+  return "[object Generator]";
+};
+
+function pushTryEntry(triple) {
+  var entry = { tryLoc: triple[0] };
+
+  if (1 in triple) {
+    entry.catchLoc = triple[1];
+  }
+
+  if (2 in triple) {
+    entry.finallyLoc = triple[2];
+  }
+
+  this.tryEntries.push(entry);
+}
+
+function resetTryEntry(entry, i) {
+  var record = entry.completion || {};
+  record.type = i === 0 ? "normal" : "return";
+  delete record.arg;
+  entry.completion = record;
+}
+
+function Context(tryList) {
+  // The root entry object (effectively a try statement without a catch
+  // or a finally block) gives us a place to store values thrown from
+  // locations where there is no enclosing try statement.
+  this.tryEntries = [{ tryLoc: "root" }];
+  tryList.forEach(pushTryEntry, this);
+  this.reset();
+}
+
+runtime.keys = function(object) {
+  var keys = [];
+  for (var key in object) {
+    keys.push(key);
+  }
+  keys.reverse();
+
+  // Rather than returning an object with a next method, we keep
+  // things simple and return the next function itself.
+  return function next() {
+    while (keys.length) {
+      var key = keys.pop();
+      if (key in object) {
+        next.value = key;
+        next.done = false;
+        return next;
+      }
+    }
+
+    // To avoid creating an additional object, we just hang the .value
+    // and .done properties off the next function object itself. This
+    // also ensures that the minifier will not anonymize the function.
+    next.done = true;
+    return next;
+  };
+};
+
+function values(iterable) {
+  var iterator = iterable;
+  if (iteratorSymbol in iterable) {
+    iterator = iterable[iteratorSymbol]();
+  } else if (!isNaN(iterable.length)) {
+    var i = -1;
+    iterator = function next() {
+      while (++i < iterable.length) {
+        if (i in iterable) {
+          next.value = iterable[i];
+          next.done = false;
+          return next;
+        }
+      }
+      next.done = true;
+      return next;
+    };
+    iterator.next = iterator;
+  }
+  return iterator;
+}
+runtime.values = values;
+
+Context.prototype = {
+  constructor: Context,
+
+  reset: function() {
+    this.prev = 0;
+    this.next = 0;
+    this.sent = undefined;
+    this.done = false;
+    this.delegate = null;
+
+    this.tryEntries.forEach(resetTryEntry);
+
+    // Pre-initialize at least 20 temporary variables to enable hidden
+    // class optimizations for simple generators.
+    for (var tempIndex = 0, tempName;
+         hasOwn.call(this, tempName = "t" + tempIndex) || tempIndex < 20;
+         ++tempIndex) {
+      this[tempName] = null;
+    }
+  },
+
+  stop: function() {
+    this.done = true;
+
+    var rootEntry = this.tryEntries[0];
+    var rootRecord = rootEntry.completion;
+    if (rootRecord.type === "throw") {
+      throw rootRecord.arg;
+    }
+
+    return this.rval;
+  },
+
+  dispatchException: function(exception) {
+    if (this.done) {
+      throw exception;
+    }
+
+    var context = this;
+    function handle(loc, caught) {
+      record.type = "throw";
+      record.arg = exception;
+      context.next = loc;
+      return !!caught;
+    }
+
+    for (var i = this.tryEntries.length - 1; i >= 0; --i) {
+      var entry = this.tryEntries[i];
+      var record = entry.completion;
+
+      if (entry.tryLoc === "root") {
+        // Exception thrown outside of any try block that could handle
+        // it, so set the completion value of the entire function to
+        // throw the exception.
+        return handle("end");
+      }
+
+      if (entry.tryLoc <= this.prev) {
+        var hasCatch = hasOwn.call(entry, "catchLoc");
+        var hasFinally = hasOwn.call(entry, "finallyLoc");
+
+        if (hasCatch && hasFinally) {
+          if (this.prev < entry.catchLoc) {
+            return handle(entry.catchLoc, true);
+          } else if (this.prev < entry.finallyLoc) {
+            return handle(entry.finallyLoc);
+          }
+
+        } else if (hasCatch) {
+          if (this.prev < entry.catchLoc) {
+            return handle(entry.catchLoc, true);
+          }
+
+        } else if (hasFinally) {
+          if (this.prev < entry.finallyLoc) {
+            return handle(entry.finallyLoc);
+          }
+
+        } else {
+          throw new Error("try statement without catch or finally");
+        }
+      }
+    }
+  },
+
+  _findFinallyEntry: function(finallyLoc) {
+    for (var i = this.tryEntries.length - 1; i >= 0; --i) {
+      var entry = this.tryEntries[i];
+      if (entry.tryLoc <= this.prev &&
+          hasOwn.call(entry, "finallyLoc") && (
+            entry.finallyLoc === finallyLoc ||
+            this.prev < entry.finallyLoc)) {
+        return entry;
+      }
+    }
+  },
+
+  abrupt: function(type, arg) {
+    var entry = this._findFinallyEntry();
+    var record = entry ? entry.completion : {};
+
+    record.type = type;
+    record.arg = arg;
+
+    if (entry) {
+      this.next = entry.finallyLoc;
+    } else {
+      this.complete(record);
+    }
+
+    return ContinueSentinel;
+  },
+
+  complete: function(record) {
+    if (record.type === "throw") {
+      throw record.arg;
+    }
+
+    if (record.type === "break" || record.type === "continue") {
+      this.next = record.arg;
+    } else if (record.type === "return") {
+      this.rval = record.arg;
+      this.next = "end";
+    }
+
+    return ContinueSentinel;
+  },
+
+  finish: function(finallyLoc) {
+    var entry = this._findFinallyEntry(finallyLoc);
+    return this.complete(entry.completion);
+  },
+
+  "catch": function(tryLoc) {
+    for (var i = this.tryEntries.length - 1; i >= 0; --i) {
+      var entry = this.tryEntries[i];
+      if (entry.tryLoc === tryLoc) {
+        var record = entry.completion;
+        var thrown;
+        if (record.type === "throw") {
+          thrown = record.arg;
+          resetTryEntry(entry, i);
+        }
+        return thrown;
+      }
+    }
+
+    // The context.catch method must only be called with a location
+    // argument that corresponds to a known catch block.
+    throw new Error("illegal catch attempt");
+  },
+
+  delegateYield: function(iterable, resultName, nextLoc) {
+    this.delegate = {
+      iterator: values(iterable),
+      resultName: resultName,
+      nextLoc: nextLoc
+    };
+
+    return ContinueSentinel;
+  }
+};
+
diff --git a/lib/6to5/transformation/transformers/generators/runtime.js b/lib/6to5/transformation/transformers/generators/runtime.js
index 12330ec166..b015b6e0b7 100644
--- a/lib/6to5/transformation/transformers/generators/runtime.js
+++ b/lib/6to5/transformation/transformers/generators/runtime.js
@@ -8,451 +8,7 @@
 * the same directory.
 */
 
-if (typeof global.regeneratorRuntime === "object") {
-  return;
+if (typeof global.regeneratorRuntime !== "object") {
+  require('./_runtime')
 }
 
-var iteratorSymbol = typeof Symbol === "function" && Symbol.iterator || "@@iterator";
-var runtime = global.regeneratorRuntime = exports;
-var hasOwn = Object.prototype.hasOwnProperty;
-
-var wrap = runtime.wrap = function wrap(innerFn, outerFn, self, tryList) {
-  return new Generator(innerFn, outerFn, self || null, tryList || []);
-};
-
-var GenStateSuspendedStart = "suspendedStart";
-var GenStateSuspendedYield = "suspendedYield";
-var GenStateExecuting = "executing";
-var GenStateCompleted = "completed";
-
-// Returning this object from the innerFn has the same effect as
-// breaking out of the dispatch switch statement.
-var ContinueSentinel = {};
-
-// Dummy constructor that we use as the .constructor property for
-// functions that return Generator objects.
-var GF = function GeneratorFunction() {};
-var GFp = function GeneratorFunctionPrototype() {};
-var Gp = GFp.prototype = Generator.prototype;
-(GFp.constructor = GF).prototype =
-  Gp.constructor = GFp;
-
-// Ensure isGeneratorFunction works when Function#name not supported.
-var GFName = "GeneratorFunction";
-if (GF.name !== GFName) GF.name = GFName;
-if (GF.name !== GFName) throw new Error(GFName + " renamed?");
-
-runtime.isGeneratorFunction = function(genFun) {
-  var ctor = genFun && genFun.constructor;
-  return ctor ? GF.name === ctor.name : false;
-};
-
-runtime.mark = function(genFun) {
-  genFun.__proto__ = GFp;
-  genFun.prototype = Object.create(Gp);
-  return genFun;
-};
-
-runtime.async = function(innerFn, outerFn, self, tryList) {
-  return new Promise(function(resolve, reject) {
-    var generator = wrap(innerFn, outerFn, self, tryList);
-    var callNext = step.bind(generator.next);
-    var callThrow = step.bind(generator["throw"]);
-
-    function step(arg) {
-      var info;
-      var value;
-
-      try {
-        info = this(arg);
-        value = info.value;
-      } catch (error) {
-        return reject(error);
-      }
-
-      if (info.done) {
-        resolve(value);
-      } else {
-        Promise.resolve(value).then(callNext, callThrow);
-      }
-    }
-
-    callNext();
-  });
-};
-
-function Generator(innerFn, outerFn, self, tryList) {
-  var generator = outerFn ? Object.create(outerFn.prototype) : this;
-  var context = new Context(tryList);
-  var state = GenStateSuspendedStart;
-
-  function invoke(method, arg) {
-    if (state === GenStateExecuting) {
-      throw new Error("Generator is already running");
-    }
-
-    if (state === GenStateCompleted) {
-      throw new Error("Generator has already finished");
-    }
-
-    while (true) {
-      var delegate = context.delegate;
-      var info;
-
-      if (delegate) {
-        try {
-          info = delegate.iterator[method](arg);
-
-          // Delegate generator ran and handled its own exceptions so
-          // regardless of what the method was, we continue as if it is
-          // "next" with an undefined arg.
-          method = "next";
-          arg = undefined;
-
-        } catch (uncaught) {
-          context.delegate = null;
-
-          // Like returning generator.throw(uncaught), but without the
-          // overhead of an extra function call.
-          method = "throw";
-          arg = uncaught;
-
-          continue;
-        }
-
-        if (info.done) {
-          context[delegate.resultName] = info.value;
-          context.next = delegate.nextLoc;
-        } else {
-          state = GenStateSuspendedYield;
-          return info;
-        }
-
-        context.delegate = null;
-      }
-
-      if (method === "next") {
-        if (state === GenStateSuspendedStart &&
-            typeof arg !== "undefined") {
-          // https://people.mozilla.org/~jorendorff/es6-draft.html#sec-generatorresume
-          throw new TypeError(
-            "attempt to send " + JSON.stringify(arg) + " to newborn generator"
-          );
-        }
-
-        if (state === GenStateSuspendedYield) {
-          context.sent = arg;
-        } else {
-          delete context.sent;
-        }
-
-      } else if (method === "throw") {
-        if (state === GenStateSuspendedStart) {
-          state = GenStateCompleted;
-          throw arg;
-        }
-
-        if (context.dispatchException(arg)) {
-          // If the dispatched exception was caught by a catch block,
-          // then let that catch block handle the exception normally.
-          method = "next";
-          arg = undefined;
-        }
-
-      } else if (method === "return") {
-        context.abrupt("return", arg);
-      }
-
-      state = GenStateExecuting;
-
-      try {
-        var value = innerFn.call(self, context);
-
-        // If an exception is thrown from innerFn, we leave state ===
-        // GenStateExecuting and loop back for another invocation.
-        state = context.done ? GenStateCompleted : GenStateSuspendedYield;
-
-        info = {
-          value: value,
-          done: context.done
-        };
-
-        if (value === ContinueSentinel) {
-          if (context.delegate && method === "next") {
-            // Deliberately forget the last sent value so that we don't
-            // accidentally pass it on to the delegate.
-            arg = undefined;
-          }
-        } else {
-          return info;
-        }
-
-      } catch (thrown) {
-        state = GenStateCompleted;
-
-        if (method === "next") {
-          context.dispatchException(thrown);
-        } else {
-          arg = thrown;
-        }
-      }
-    }
-  }
-
-  generator.next = invoke.bind(generator, "next");
-  generator["throw"] = invoke.bind(generator, "throw");
-  generator["return"] = invoke.bind(generator, "return");
-
-  return generator;
-}
-
-Gp[iteratorSymbol] = function() {
-  return this;
-};
-
-Gp.toString = function() {
-  return "[object Generator]";
-};
-
-function pushTryEntry(triple) {
-  var entry = { tryLoc: triple[0] };
-
-  if (1 in triple) {
-    entry.catchLoc = triple[1];
-  }
-
-  if (2 in triple) {
-    entry.finallyLoc = triple[2];
-  }
-
-  this.tryEntries.push(entry);
-}
-
-function resetTryEntry(entry, i) {
-  var record = entry.completion || {};
-  record.type = i === 0 ? "normal" : "return";
-  delete record.arg;
-  entry.completion = record;
-}
-
-function Context(tryList) {
-  // The root entry object (effectively a try statement without a catch
-  // or a finally block) gives us a place to store values thrown from
-  // locations where there is no enclosing try statement.
-  this.tryEntries = [{ tryLoc: "root" }];
-  tryList.forEach(pushTryEntry, this);
-  this.reset();
-}
-
-runtime.keys = function(object) {
-  var keys = [];
-  for (var key in object) {
-    keys.push(key);
-  }
-  keys.reverse();
-
-  // Rather than returning an object with a next method, we keep
-  // things simple and return the next function itself.
-  return function next() {
-    while (keys.length) {
-      var key = keys.pop();
-      if (key in object) {
-        next.value = key;
-        next.done = false;
-        return next;
-      }
-    }
-
-    // To avoid creating an additional object, we just hang the .value
-    // and .done properties off the next function object itself. This
-    // also ensures that the minifier will not anonymize the function.
-    next.done = true;
-    return next;
-  };
-};
-
-function values(iterable) {
-  var iterator = iterable;
-  if (iteratorSymbol in iterable) {
-    iterator = iterable[iteratorSymbol]();
-  } else if (!isNaN(iterable.length)) {
-    var i = -1;
-    iterator = function next() {
-      while (++i < iterable.length) {
-        if (i in iterable) {
-          next.value = iterable[i];
-          next.done = false;
-          return next;
-        }
-      }
-      next.done = true;
-      return next;
-    };
-    iterator.next = iterator;
-  }
-  return iterator;
-}
-runtime.values = values;
-
-Context.prototype = {
-  constructor: Context,
-
-  reset: function() {
-    this.prev = 0;
-    this.next = 0;
-    this.sent = undefined;
-    this.done = false;
-    this.delegate = null;
-
-    this.tryEntries.forEach(resetTryEntry);
-
-    // Pre-initialize at least 20 temporary variables to enable hidden
-    // class optimizations for simple generators.
-    for (var tempIndex = 0, tempName;
-         hasOwn.call(this, tempName = "t" + tempIndex) || tempIndex < 20;
-         ++tempIndex) {
-      this[tempName] = null;
-    }
-  },
-
-  stop: function() {
-    this.done = true;
-
-    var rootEntry = this.tryEntries[0];
-    var rootRecord = rootEntry.completion;
-    if (rootRecord.type === "throw") {
-      throw rootRecord.arg;
-    }
-
-    return this.rval;
-  },
-
-  dispatchException: function(exception) {
-    if (this.done) {
-      throw exception;
-    }
-
-    var context = this;
-    function handle(loc, caught) {
-      record.type = "throw";
-      record.arg = exception;
-      context.next = loc;
-      return !!caught;
-    }
-
-    for (var i = this.tryEntries.length - 1; i >= 0; --i) {
-      var entry = this.tryEntries[i];
-      var record = entry.completion;
-
-      if (entry.tryLoc === "root") {
-        // Exception thrown outside of any try block that could handle
-        // it, so set the completion value of the entire function to
-        // throw the exception.
-        return handle("end");
-      }
-
-      if (entry.tryLoc <= this.prev) {
-        var hasCatch = hasOwn.call(entry, "catchLoc");
-        var hasFinally = hasOwn.call(entry, "finallyLoc");
-
-        if (hasCatch && hasFinally) {
-          if (this.prev < entry.catchLoc) {
-            return handle(entry.catchLoc, true);
-          } else if (this.prev < entry.finallyLoc) {
-            return handle(entry.finallyLoc);
-          }
-
-        } else if (hasCatch) {
-          if (this.prev < entry.catchLoc) {
-            return handle(entry.catchLoc, true);
-          }
-
-        } else if (hasFinally) {
-          if (this.prev < entry.finallyLoc) {
-            return handle(entry.finallyLoc);
-          }
-
-        } else {
-          throw new Error("try statement without catch or finally");
-        }
-      }
-    }
-  },
-
-  _findFinallyEntry: function(finallyLoc) {
-    for (var i = this.tryEntries.length - 1; i >= 0; --i) {
-      var entry = this.tryEntries[i];
-      if (entry.tryLoc <= this.prev &&
-          hasOwn.call(entry, "finallyLoc") && (
-            entry.finallyLoc === finallyLoc ||
-            this.prev < entry.finallyLoc)) {
-        return entry;
-      }
-    }
-  },
-
-  abrupt: function(type, arg) {
-    var entry = this._findFinallyEntry();
-    var record = entry ? entry.completion : {};
-
-    record.type = type;
-    record.arg = arg;
-
-    if (entry) {
-      this.next = entry.finallyLoc;
-    } else {
-      this.complete(record);
-    }
-
-    return ContinueSentinel;
-  },
-
-  complete: function(record) {
-    if (record.type === "throw") {
-      throw record.arg;
-    }
-
-    if (record.type === "break" || record.type === "continue") {
-      this.next = record.arg;
-    } else if (record.type === "return") {
-      this.rval = record.arg;
-      this.next = "end";
-    }
-
-    return ContinueSentinel;
-  },
-
-  finish: function(finallyLoc) {
-    var entry = this._findFinallyEntry(finallyLoc);
-    return this.complete(entry.completion);
-  },
-
-  "catch": function(tryLoc) {
-    for (var i = this.tryEntries.length - 1; i >= 0; --i) {
-      var entry = this.tryEntries[i];
-      if (entry.tryLoc === tryLoc) {
-        var record = entry.completion;
-        var thrown;
-        if (record.type === "throw") {
-          thrown = record.arg;
-          resetTryEntry(entry, i);
-        }
-        return thrown;
-      }
-    }
-
-    // The context.catch method must only be called with a location
-    // argument that corresponds to a known catch block.
-    throw new Error("illegal catch attempt");
-  },
-
-  delegateYield: function(iterable, resultName, nextLoc) {
-    this.delegate = {
-      iterator: values(iterable),
-      resultName: resultName,
-      nextLoc: nextLoc
-    };
-
-    return ContinueSentinel;
-  }
-};

From a0eb108cd498622cb7e1c1e164c5bab7f23b9645 Mon Sep 17 00:00:00 2001
From: Brent Burgoyne <brent47@gmail.com>
Date: Tue, 18 Nov 2014 07:10:47 -0700
Subject: [PATCH 2/3] Remove global existence check

---
 .../transformers/generators/runtime.js        | 444 +++++++++++++++++-
 1 file changed, 442 insertions(+), 2 deletions(-)

diff --git a/lib/6to5/transformation/transformers/generators/runtime.js b/lib/6to5/transformation/transformers/generators/runtime.js
index b015b6e0b7..5257c4b937 100644
--- a/lib/6to5/transformation/transformers/generators/runtime.js
+++ b/lib/6to5/transformation/transformers/generators/runtime.js
@@ -8,7 +8,447 @@
 * the same directory.
 */
 
-if (typeof global.regeneratorRuntime !== "object") {
-  require('./_runtime')
+var iteratorSymbol = typeof Symbol === "function" && Symbol.iterator || "@@iterator";
+var runtime = global.regeneratorRuntime = exports;
+var hasOwn = Object.prototype.hasOwnProperty;
+
+var wrap = runtime.wrap = function wrap(innerFn, outerFn, self, tryList) {
+  return new Generator(innerFn, outerFn, self || null, tryList || []);
+};
+
+var GenStateSuspendedStart = "suspendedStart";
+var GenStateSuspendedYield = "suspendedYield";
+var GenStateExecuting = "executing";
+var GenStateCompleted = "completed";
+
+// Returning this object from the innerFn has the same effect as
+// breaking out of the dispatch switch statement.
+var ContinueSentinel = {};
+
+// Dummy constructor that we use as the .constructor property for
+// functions that return Generator objects.
+var GF = function GeneratorFunction() {};
+var GFp = function GeneratorFunctionPrototype() {};
+var Gp = GFp.prototype = Generator.prototype;
+(GFp.constructor = GF).prototype =
+  Gp.constructor = GFp;
+
+// Ensure isGeneratorFunction works when Function#name not supported.
+var GFName = "GeneratorFunction";
+if (GF.name !== GFName) GF.name = GFName;
+if (GF.name !== GFName) throw new Error(GFName + " renamed?");
+
+runtime.isGeneratorFunction = function(genFun) {
+  var ctor = genFun && genFun.constructor;
+  return ctor ? GF.name === ctor.name : false;
+};
+
+runtime.mark = function(genFun) {
+  genFun.__proto__ = GFp;
+  genFun.prototype = Object.create(Gp);
+  return genFun;
+};
+
+runtime.async = function(innerFn, outerFn, self, tryList) {
+  return new Promise(function(resolve, reject) {
+    var generator = wrap(innerFn, outerFn, self, tryList);
+    var callNext = step.bind(generator.next);
+    var callThrow = step.bind(generator["throw"]);
+
+    function step(arg) {
+      var info;
+      var value;
+
+      try {
+        info = this(arg);
+        value = info.value;
+      } catch (error) {
+        return reject(error);
+      }
+
+      if (info.done) {
+        resolve(value);
+      } else {
+        Promise.resolve(value).then(callNext, callThrow);
+      }
+    }
+
+    callNext();
+  });
+};
+
+function Generator(innerFn, outerFn, self, tryList) {
+  var generator = outerFn ? Object.create(outerFn.prototype) : this;
+  var context = new Context(tryList);
+  var state = GenStateSuspendedStart;
+
+  function invoke(method, arg) {
+    if (state === GenStateExecuting) {
+      throw new Error("Generator is already running");
+    }
+
+    if (state === GenStateCompleted) {
+      throw new Error("Generator has already finished");
+    }
+
+    while (true) {
+      var delegate = context.delegate;
+      var info;
+
+      if (delegate) {
+        try {
+          info = delegate.iterator[method](arg);
+
+          // Delegate generator ran and handled its own exceptions so
+          // regardless of what the method was, we continue as if it is
+          // "next" with an undefined arg.
+          method = "next";
+          arg = undefined;
+
+        } catch (uncaught) {
+          context.delegate = null;
+
+          // Like returning generator.throw(uncaught), but without the
+          // overhead of an extra function call.
+          method = "throw";
+          arg = uncaught;
+
+          continue;
+        }
+
+        if (info.done) {
+          context[delegate.resultName] = info.value;
+          context.next = delegate.nextLoc;
+        } else {
+          state = GenStateSuspendedYield;
+          return info;
+        }
+
+        context.delegate = null;
+      }
+
+      if (method === "next") {
+        if (state === GenStateSuspendedStart &&
+            typeof arg !== "undefined") {
+          // https://people.mozilla.org/~jorendorff/es6-draft.html#sec-generatorresume
+          throw new TypeError(
+            "attempt to send " + JSON.stringify(arg) + " to newborn generator"
+          );
+        }
+
+        if (state === GenStateSuspendedYield) {
+          context.sent = arg;
+        } else {
+          delete context.sent;
+        }
+
+      } else if (method === "throw") {
+        if (state === GenStateSuspendedStart) {
+          state = GenStateCompleted;
+          throw arg;
+        }
+
+        if (context.dispatchException(arg)) {
+          // If the dispatched exception was caught by a catch block,
+          // then let that catch block handle the exception normally.
+          method = "next";
+          arg = undefined;
+        }
+
+      } else if (method === "return") {
+        context.abrupt("return", arg);
+      }
+
+      state = GenStateExecuting;
+
+      try {
+        var value = innerFn.call(self, context);
+
+        // If an exception is thrown from innerFn, we leave state ===
+        // GenStateExecuting and loop back for another invocation.
+        state = context.done ? GenStateCompleted : GenStateSuspendedYield;
+
+        info = {
+          value: value,
+          done: context.done
+        };
+
+        if (value === ContinueSentinel) {
+          if (context.delegate && method === "next") {
+            // Deliberately forget the last sent value so that we don't
+            // accidentally pass it on to the delegate.
+            arg = undefined;
+          }
+        } else {
+          return info;
+        }
+
+      } catch (thrown) {
+        state = GenStateCompleted;
+
+        if (method === "next") {
+          context.dispatchException(thrown);
+        } else {
+          arg = thrown;
+        }
+      }
+    }
+  }
+
+  generator.next = invoke.bind(generator, "next");
+  generator["throw"] = invoke.bind(generator, "throw");
+  generator["return"] = invoke.bind(generator, "return");
+
+  return generator;
 }
 
+Gp[iteratorSymbol] = function() {
+  return this;
+};
+
+Gp.toString = function() {
+  return "[object Generator]";
+};
+
+function pushTryEntry(triple) {
+  var entry = { tryLoc: triple[0] };
+
+  if (1 in triple) {
+    entry.catchLoc = triple[1];
+  }
+
+  if (2 in triple) {
+    entry.finallyLoc = triple[2];
+  }
+
+  this.tryEntries.push(entry);
+}
+
+function resetTryEntry(entry, i) {
+  var record = entry.completion || {};
+  record.type = i === 0 ? "normal" : "return";
+  delete record.arg;
+  entry.completion = record;
+}
+
+function Context(tryList) {
+  // The root entry object (effectively a try statement without a catch
+  // or a finally block) gives us a place to store values thrown from
+  // locations where there is no enclosing try statement.
+  this.tryEntries = [{ tryLoc: "root" }];
+  tryList.forEach(pushTryEntry, this);
+  this.reset();
+}
+
+runtime.keys = function(object) {
+  var keys = [];
+  for (var key in object) {
+    keys.push(key);
+  }
+  keys.reverse();
+
+  // Rather than returning an object with a next method, we keep
+  // things simple and return the next function itself.
+  return function next() {
+    while (keys.length) {
+      var key = keys.pop();
+      if (key in object) {
+        next.value = key;
+        next.done = false;
+        return next;
+      }
+    }
+
+    // To avoid creating an additional object, we just hang the .value
+    // and .done properties off the next function object itself. This
+    // also ensures that the minifier will not anonymize the function.
+    next.done = true;
+    return next;
+  };
+};
+
+function values(iterable) {
+  var iterator = iterable;
+  if (iteratorSymbol in iterable) {
+    iterator = iterable[iteratorSymbol]();
+  } else if (!isNaN(iterable.length)) {
+    var i = -1;
+    iterator = function next() {
+      while (++i < iterable.length) {
+        if (i in iterable) {
+          next.value = iterable[i];
+          next.done = false;
+          return next;
+        }
+      }
+      next.done = true;
+      return next;
+    };
+    iterator.next = iterator;
+  }
+  return iterator;
+}
+runtime.values = values;
+
+Context.prototype = {
+  constructor: Context,
+
+  reset: function() {
+    this.prev = 0;
+    this.next = 0;
+    this.sent = undefined;
+    this.done = false;
+    this.delegate = null;
+
+    this.tryEntries.forEach(resetTryEntry);
+
+    // Pre-initialize at least 20 temporary variables to enable hidden
+    // class optimizations for simple generators.
+    for (var tempIndex = 0, tempName;
+         hasOwn.call(this, tempName = "t" + tempIndex) || tempIndex < 20;
+         ++tempIndex) {
+      this[tempName] = null;
+    }
+  },
+
+  stop: function() {
+    this.done = true;
+
+    var rootEntry = this.tryEntries[0];
+    var rootRecord = rootEntry.completion;
+    if (rootRecord.type === "throw") {
+      throw rootRecord.arg;
+    }
+
+    return this.rval;
+  },
+
+  dispatchException: function(exception) {
+    if (this.done) {
+      throw exception;
+    }
+
+    var context = this;
+    function handle(loc, caught) {
+      record.type = "throw";
+      record.arg = exception;
+      context.next = loc;
+      return !!caught;
+    }
+
+    for (var i = this.tryEntries.length - 1; i >= 0; --i) {
+      var entry = this.tryEntries[i];
+      var record = entry.completion;
+
+      if (entry.tryLoc === "root") {
+        // Exception thrown outside of any try block that could handle
+        // it, so set the completion value of the entire function to
+        // throw the exception.
+        return handle("end");
+      }
+
+      if (entry.tryLoc <= this.prev) {
+        var hasCatch = hasOwn.call(entry, "catchLoc");
+        var hasFinally = hasOwn.call(entry, "finallyLoc");
+
+        if (hasCatch && hasFinally) {
+          if (this.prev < entry.catchLoc) {
+            return handle(entry.catchLoc, true);
+          } else if (this.prev < entry.finallyLoc) {
+            return handle(entry.finallyLoc);
+          }
+
+        } else if (hasCatch) {
+          if (this.prev < entry.catchLoc) {
+            return handle(entry.catchLoc, true);
+          }
+
+        } else if (hasFinally) {
+          if (this.prev < entry.finallyLoc) {
+            return handle(entry.finallyLoc);
+          }
+
+        } else {
+          throw new Error("try statement without catch or finally");
+        }
+      }
+    }
+  },
+
+  _findFinallyEntry: function(finallyLoc) {
+    for (var i = this.tryEntries.length - 1; i >= 0; --i) {
+      var entry = this.tryEntries[i];
+      if (entry.tryLoc <= this.prev &&
+          hasOwn.call(entry, "finallyLoc") && (
+            entry.finallyLoc === finallyLoc ||
+            this.prev < entry.finallyLoc)) {
+        return entry;
+      }
+    }
+  },
+
+  abrupt: function(type, arg) {
+    var entry = this._findFinallyEntry();
+    var record = entry ? entry.completion : {};
+
+    record.type = type;
+    record.arg = arg;
+
+    if (entry) {
+      this.next = entry.finallyLoc;
+    } else {
+      this.complete(record);
+    }
+
+    return ContinueSentinel;
+  },
+
+  complete: function(record) {
+    if (record.type === "throw") {
+      throw record.arg;
+    }
+
+    if (record.type === "break" || record.type === "continue") {
+      this.next = record.arg;
+    } else if (record.type === "return") {
+      this.rval = record.arg;
+      this.next = "end";
+    }
+
+    return ContinueSentinel;
+  },
+
+  finish: function(finallyLoc) {
+    var entry = this._findFinallyEntry(finallyLoc);
+    return this.complete(entry.completion);
+  },
+
+  "catch": function(tryLoc) {
+    for (var i = this.tryEntries.length - 1; i >= 0; --i) {
+      var entry = this.tryEntries[i];
+      if (entry.tryLoc === tryLoc) {
+        var record = entry.completion;
+        var thrown;
+        if (record.type === "throw") {
+          thrown = record.arg;
+          resetTryEntry(entry, i);
+        }
+        return thrown;
+      }
+    }
+
+    // The context.catch method must only be called with a location
+    // argument that corresponds to a known catch block.
+    throw new Error("illegal catch attempt");
+  },
+
+  delegateYield: function(iterable, resultName, nextLoc) {
+    this.delegate = {
+      iterator: values(iterable),
+      resultName: resultName,
+      nextLoc: nextLoc
+    };
+
+    return ContinueSentinel;
+  }
+};

From 861b9e68d331787e2c27d83701f93e5c4301620f Mon Sep 17 00:00:00 2001
From: Brent Burgoyne <brent47@gmail.com>
Date: Tue, 18 Nov 2014 07:13:12 -0700
Subject: [PATCH 3/3] Deleted uneeded _runtime.js

---
 .../transformers/generators/_runtime.js       | 455 ------------------
 1 file changed, 455 deletions(-)
 delete mode 100644 lib/6to5/transformation/transformers/generators/_runtime.js

diff --git a/lib/6to5/transformation/transformers/generators/_runtime.js b/lib/6to5/transformation/transformers/generators/_runtime.js
deleted file mode 100644
index f396de8cff..0000000000
--- a/lib/6to5/transformation/transformers/generators/_runtime.js
+++ /dev/null
@@ -1,455 +0,0 @@
-/**
-* Copyright (c) 2014, Facebook, Inc.
-* All rights reserved.
-*
-* This source code is licensed under the BSD-style license found in the
-* https://raw.github.com/facebook/regenerator/master/LICENSE file. An
-* additional grant of patent rights can be found in the PATENTS file in
-* the same directory.
-*/
-
-var iteratorSymbol = typeof Symbol === "function" && Symbol.iterator || "@@iterator";
-var runtime = global.regeneratorRuntime = exports;
-var hasOwn = Object.prototype.hasOwnProperty;
-
-var wrap = runtime.wrap = function wrap(innerFn, outerFn, self, tryList) {
-  return new Generator(innerFn, outerFn, self || null, tryList || []);
-};
-
-var GenStateSuspendedStart = "suspendedStart";
-var GenStateSuspendedYield = "suspendedYield";
-var GenStateExecuting = "executing";
-var GenStateCompleted = "completed";
-
-// Returning this object from the innerFn has the same effect as
-// breaking out of the dispatch switch statement.
-var ContinueSentinel = {};
-
-// Dummy constructor that we use as the .constructor property for
-// functions that return Generator objects.
-var GF = function GeneratorFunction() {};
-var GFp = function GeneratorFunctionPrototype() {};
-var Gp = GFp.prototype = Generator.prototype;
-(GFp.constructor = GF).prototype =
-  Gp.constructor = GFp;
-
-// Ensure isGeneratorFunction works when Function#name not supported.
-var GFName = "GeneratorFunction";
-if (GF.name !== GFName) GF.name = GFName;
-if (GF.name !== GFName) throw new Error(GFName + " renamed?");
-
-runtime.isGeneratorFunction = function(genFun) {
-  var ctor = genFun && genFun.constructor;
-  return ctor ? GF.name === ctor.name : false;
-};
-
-runtime.mark = function(genFun) {
-  genFun.__proto__ = GFp;
-  genFun.prototype = Object.create(Gp);
-  return genFun;
-};
-
-runtime.async = function(innerFn, outerFn, self, tryList) {
-  return new Promise(function(resolve, reject) {
-    var generator = wrap(innerFn, outerFn, self, tryList);
-    var callNext = step.bind(generator.next);
-    var callThrow = step.bind(generator["throw"]);
-
-    function step(arg) {
-      var info;
-      var value;
-
-      try {
-        info = this(arg);
-        value = info.value;
-      } catch (error) {
-        return reject(error);
-      }
-
-      if (info.done) {
-        resolve(value);
-      } else {
-        Promise.resolve(value).then(callNext, callThrow);
-      }
-    }
-
-    callNext();
-  });
-};
-
-function Generator(innerFn, outerFn, self, tryList) {
-  var generator = outerFn ? Object.create(outerFn.prototype) : this;
-  var context = new Context(tryList);
-  var state = GenStateSuspendedStart;
-
-  function invoke(method, arg) {
-    if (state === GenStateExecuting) {
-      throw new Error("Generator is already running");
-    }
-
-    if (state === GenStateCompleted) {
-      throw new Error("Generator has already finished");
-    }
-
-    while (true) {
-      var delegate = context.delegate;
-      var info;
-
-      if (delegate) {
-        try {
-          info = delegate.iterator[method](arg);
-
-          // Delegate generator ran and handled its own exceptions so
-          // regardless of what the method was, we continue as if it is
-          // "next" with an undefined arg.
-          method = "next";
-          arg = undefined;
-
-        } catch (uncaught) {
-          context.delegate = null;
-
-          // Like returning generator.throw(uncaught), but without the
-          // overhead of an extra function call.
-          method = "throw";
-          arg = uncaught;
-
-          continue;
-        }
-
-        if (info.done) {
-          context[delegate.resultName] = info.value;
-          context.next = delegate.nextLoc;
-        } else {
-          state = GenStateSuspendedYield;
-          return info;
-        }
-
-        context.delegate = null;
-      }
-
-      if (method === "next") {
-        if (state === GenStateSuspendedStart &&
-            typeof arg !== "undefined") {
-          // https://people.mozilla.org/~jorendorff/es6-draft.html#sec-generatorresume
-          throw new TypeError(
-            "attempt to send " + JSON.stringify(arg) + " to newborn generator"
-          );
-        }
-
-        if (state === GenStateSuspendedYield) {
-          context.sent = arg;
-        } else {
-          delete context.sent;
-        }
-
-      } else if (method === "throw") {
-        if (state === GenStateSuspendedStart) {
-          state = GenStateCompleted;
-          throw arg;
-        }
-
-        if (context.dispatchException(arg)) {
-          // If the dispatched exception was caught by a catch block,
-          // then let that catch block handle the exception normally.
-          method = "next";
-          arg = undefined;
-        }
-
-      } else if (method === "return") {
-        context.abrupt("return", arg);
-      }
-
-      state = GenStateExecuting;
-
-      try {
-        var value = innerFn.call(self, context);
-
-        // If an exception is thrown from innerFn, we leave state ===
-        // GenStateExecuting and loop back for another invocation.
-        state = context.done ? GenStateCompleted : GenStateSuspendedYield;
-
-        info = {
-          value: value,
-          done: context.done
-        };
-
-        if (value === ContinueSentinel) {
-          if (context.delegate && method === "next") {
-            // Deliberately forget the last sent value so that we don't
-            // accidentally pass it on to the delegate.
-            arg = undefined;
-          }
-        } else {
-          return info;
-        }
-
-      } catch (thrown) {
-        state = GenStateCompleted;
-
-        if (method === "next") {
-          context.dispatchException(thrown);
-        } else {
-          arg = thrown;
-        }
-      }
-    }
-  }
-
-  generator.next = invoke.bind(generator, "next");
-  generator["throw"] = invoke.bind(generator, "throw");
-  generator["return"] = invoke.bind(generator, "return");
-
-  return generator;
-}
-
-Gp[iteratorSymbol] = function() {
-  return this;
-};
-
-Gp.toString = function() {
-  return "[object Generator]";
-};
-
-function pushTryEntry(triple) {
-  var entry = { tryLoc: triple[0] };
-
-  if (1 in triple) {
-    entry.catchLoc = triple[1];
-  }
-
-  if (2 in triple) {
-    entry.finallyLoc = triple[2];
-  }
-
-  this.tryEntries.push(entry);
-}
-
-function resetTryEntry(entry, i) {
-  var record = entry.completion || {};
-  record.type = i === 0 ? "normal" : "return";
-  delete record.arg;
-  entry.completion = record;
-}
-
-function Context(tryList) {
-  // The root entry object (effectively a try statement without a catch
-  // or a finally block) gives us a place to store values thrown from
-  // locations where there is no enclosing try statement.
-  this.tryEntries = [{ tryLoc: "root" }];
-  tryList.forEach(pushTryEntry, this);
-  this.reset();
-}
-
-runtime.keys = function(object) {
-  var keys = [];
-  for (var key in object) {
-    keys.push(key);
-  }
-  keys.reverse();
-
-  // Rather than returning an object with a next method, we keep
-  // things simple and return the next function itself.
-  return function next() {
-    while (keys.length) {
-      var key = keys.pop();
-      if (key in object) {
-        next.value = key;
-        next.done = false;
-        return next;
-      }
-    }
-
-    // To avoid creating an additional object, we just hang the .value
-    // and .done properties off the next function object itself. This
-    // also ensures that the minifier will not anonymize the function.
-    next.done = true;
-    return next;
-  };
-};
-
-function values(iterable) {
-  var iterator = iterable;
-  if (iteratorSymbol in iterable) {
-    iterator = iterable[iteratorSymbol]();
-  } else if (!isNaN(iterable.length)) {
-    var i = -1;
-    iterator = function next() {
-      while (++i < iterable.length) {
-        if (i in iterable) {
-          next.value = iterable[i];
-          next.done = false;
-          return next;
-        }
-      }
-      next.done = true;
-      return next;
-    };
-    iterator.next = iterator;
-  }
-  return iterator;
-}
-runtime.values = values;
-
-Context.prototype = {
-  constructor: Context,
-
-  reset: function() {
-    this.prev = 0;
-    this.next = 0;
-    this.sent = undefined;
-    this.done = false;
-    this.delegate = null;
-
-    this.tryEntries.forEach(resetTryEntry);
-
-    // Pre-initialize at least 20 temporary variables to enable hidden
-    // class optimizations for simple generators.
-    for (var tempIndex = 0, tempName;
-         hasOwn.call(this, tempName = "t" + tempIndex) || tempIndex < 20;
-         ++tempIndex) {
-      this[tempName] = null;
-    }
-  },
-
-  stop: function() {
-    this.done = true;
-
-    var rootEntry = this.tryEntries[0];
-    var rootRecord = rootEntry.completion;
-    if (rootRecord.type === "throw") {
-      throw rootRecord.arg;
-    }
-
-    return this.rval;
-  },
-
-  dispatchException: function(exception) {
-    if (this.done) {
-      throw exception;
-    }
-
-    var context = this;
-    function handle(loc, caught) {
-      record.type = "throw";
-      record.arg = exception;
-      context.next = loc;
-      return !!caught;
-    }
-
-    for (var i = this.tryEntries.length - 1; i >= 0; --i) {
-      var entry = this.tryEntries[i];
-      var record = entry.completion;
-
-      if (entry.tryLoc === "root") {
-        // Exception thrown outside of any try block that could handle
-        // it, so set the completion value of the entire function to
-        // throw the exception.
-        return handle("end");
-      }
-
-      if (entry.tryLoc <= this.prev) {
-        var hasCatch = hasOwn.call(entry, "catchLoc");
-        var hasFinally = hasOwn.call(entry, "finallyLoc");
-
-        if (hasCatch && hasFinally) {
-          if (this.prev < entry.catchLoc) {
-            return handle(entry.catchLoc, true);
-          } else if (this.prev < entry.finallyLoc) {
-            return handle(entry.finallyLoc);
-          }
-
-        } else if (hasCatch) {
-          if (this.prev < entry.catchLoc) {
-            return handle(entry.catchLoc, true);
-          }
-
-        } else if (hasFinally) {
-          if (this.prev < entry.finallyLoc) {
-            return handle(entry.finallyLoc);
-          }
-
-        } else {
-          throw new Error("try statement without catch or finally");
-        }
-      }
-    }
-  },
-
-  _findFinallyEntry: function(finallyLoc) {
-    for (var i = this.tryEntries.length - 1; i >= 0; --i) {
-      var entry = this.tryEntries[i];
-      if (entry.tryLoc <= this.prev &&
-          hasOwn.call(entry, "finallyLoc") && (
-            entry.finallyLoc === finallyLoc ||
-            this.prev < entry.finallyLoc)) {
-        return entry;
-      }
-    }
-  },
-
-  abrupt: function(type, arg) {
-    var entry = this._findFinallyEntry();
-    var record = entry ? entry.completion : {};
-
-    record.type = type;
-    record.arg = arg;
-
-    if (entry) {
-      this.next = entry.finallyLoc;
-    } else {
-      this.complete(record);
-    }
-
-    return ContinueSentinel;
-  },
-
-  complete: function(record) {
-    if (record.type === "throw") {
-      throw record.arg;
-    }
-
-    if (record.type === "break" || record.type === "continue") {
-      this.next = record.arg;
-    } else if (record.type === "return") {
-      this.rval = record.arg;
-      this.next = "end";
-    }
-
-    return ContinueSentinel;
-  },
-
-  finish: function(finallyLoc) {
-    var entry = this._findFinallyEntry(finallyLoc);
-    return this.complete(entry.completion);
-  },
-
-  "catch": function(tryLoc) {
-    for (var i = this.tryEntries.length - 1; i >= 0; --i) {
-      var entry = this.tryEntries[i];
-      if (entry.tryLoc === tryLoc) {
-        var record = entry.completion;
-        var thrown;
-        if (record.type === "throw") {
-          thrown = record.arg;
-          resetTryEntry(entry, i);
-        }
-        return thrown;
-      }
-    }
-
-    // The context.catch method must only be called with a location
-    // argument that corresponds to a known catch block.
-    throw new Error("illegal catch attempt");
-  },
-
-  delegateYield: function(iterable, resultName, nextLoc) {
-    this.delegate = {
-      iterator: values(iterable),
-      resultName: resultName,
-      nextLoc: nextLoc
-    };
-
-    return ContinueSentinel;
-  }
-};
-