diff --git a/packages/babel-plugin-transform-block-scoping/src/loop.ts b/packages/babel-plugin-transform-block-scoping/src/loop.ts
index 6c0fa83aad28..1fbe72eadd26 100644
--- a/packages/babel-plugin-transform-block-scoping/src/loop.ts
+++ b/packages/babel-plugin-transform-block-scoping/src/loop.ts
@@ -254,45 +254,92 @@ export function wrapLoopBody(
     }
   }
   if (varNames.length) {
-    bodyStmts.push(
-      t.variableDeclaration(
-        "var",
-        varNames.map(name => t.variableDeclarator(t.identifier(name))),
-      ),
+    varPath.pushContainer(
+      "declarations",
+      varNames.map(name => t.variableDeclarator(t.identifier(name))),
     );
   }
 
-  if (state.breaksContinues.length === 0 && state.returns.length === 0) {
+  const labelNum = state.breaksContinues.length;
+  const returnNum = state.returns.length;
+  if (labelNum + returnNum === 0) {
     bodyStmts.push(t.expressionStatement(call));
+  } else if (labelNum === 1 && returnNum === 0) {
+    for (const path of state.breaksContinues) {
+      const { node } = path;
+      const { type, label } = node;
+      let name = type === "BreakStatement" ? "break" : "continue";
+      if (label) name += " " + label.name;
+      path.replaceWith(
+        t.addComment(
+          t.returnStatement(t.numericLiteral(1)),
+          "trailing",
+          " " + name,
+          true,
+        ),
+      );
+      if (updaterNode) path.insertBefore(t.cloneNode(updaterNode));
+
+      bodyStmts.push(
+        template.statement.ast`
+        if (${call}) ${node}
+      `,
+      );
+    }
   } else {
     const completionId = loopPath.scope.generateUid("ret");
-    bodyStmts.push(
-      t.variableDeclaration("var", [
-        t.variableDeclarator(t.identifier(completionId), call),
-      ]),
-    );
 
-    const injected = new Set<string>();
+    if (varPath.isVariableDeclaration()) {
+      varPath.pushContainer("declarations", [
+        t.variableDeclarator(t.identifier(completionId)),
+      ]);
+      bodyStmts.push(
+        t.expressionStatement(
+          t.assignmentExpression("=", t.identifier(completionId), call),
+        ),
+      );
+    } else {
+      bodyStmts.push(
+        t.variableDeclaration("var", [
+          t.variableDeclarator(t.identifier(completionId), call),
+        ]),
+      );
+    }
+
+    const injected: string[] = [];
     for (const path of state.breaksContinues) {
       const { node } = path;
       const { type, label } = node;
       let name = type === "BreakStatement" ? "break" : "continue";
-      if (label) name += "|" + label.name;
-      path.replaceWith(t.returnStatement(t.stringLiteral(name)));
+      if (label) name += " " + label.name;
+
+      let i = injected.indexOf(name);
+      const hasInjected = i !== -1;
+      if (!hasInjected) {
+        injected.push(name);
+        i = injected.length - 1;
+      }
+
+      path.replaceWith(
+        t.addComment(
+          t.returnStatement(t.numericLiteral(i)),
+          "trailing",
+          " " + name,
+          true,
+        ),
+      );
       if (updaterNode) path.insertBefore(t.cloneNode(updaterNode));
 
-      if (injected.has(name)) continue;
-      injected.add(name);
+      if (hasInjected) continue;
 
       bodyStmts.push(
         template.statement.ast`
-        if (
-          ${t.identifier(completionId)} === ${t.stringLiteral(name)}
-        ) ${node}
+        if (${t.identifier(completionId)} === ${t.numericLiteral(i)}) ${node}
       `,
       );
     }
-    if (state.returns.length) {
+
+    if (returnNum) {
       for (const path of state.returns) {
         const arg = path.node.argument || path.scope.buildUndefinedNode();
         path.replaceWith(
@@ -304,9 +351,10 @@ export function wrapLoopBody(
 
       bodyStmts.push(
         template.statement.ast`
-        if (typeof ${t.identifier(completionId)} === "object")
-          return ${t.identifier(completionId)}.v;
-      `,
+          if (${t.identifier(completionId)}) return ${t.identifier(
+            completionId,
+          )}.v;
+        `,
       );
     }
   }
diff --git a/packages/babel-plugin-transform-block-scoping/test/fixtures/general/block-inside-switch-inside-loop/output.js b/packages/babel-plugin-transform-block-scoping/test/fixtures/general/block-inside-switch-inside-loop/output.js
index 6aebc4bb8a8e..a79ae09809f3 100644
--- a/packages/babel-plugin-transform-block-scoping/test/fixtures/general/block-inside-switch-inside-loop/output.js
+++ b/packages/babel-plugin-transform-block-scoping/test/fixtures/general/block-inside-switch-inside-loop/output.js
@@ -20,7 +20,7 @@ var j = 0;
 var _loop2 = function () {
   switch (i) {
     case 0:
-      return "continue";
+      return 1; // continue
   }
   j++;
   var z = 3;
@@ -29,37 +29,35 @@ var _loop2 = function () {
   });
 };
 for (i = 0; i < 10; i++) {
-  var _ret = _loop2();
-  if (_ret === "continue") continue;
+  if (_loop2()) continue;
 }
 expect(j).toBe(9);
 
 // it should work with loops nested within switch
 j = 0;
 var _loop3 = function () {
-  switch (i) {
-    case 0:
-      var _loop4 = function () {
-        var z = 3;
-        (function () {
-          return z;
-        });
-        j++;
-        return "break";
-      };
-      for (k = 0; k < 10; k++) {
-        var _ret2 = _loop4();
-        if (_ret2 === "break") break;
-      }
-      break;
-  }
-  var z = 3;
-  (function () {
-    return z;
-  });
-};
+    switch (i) {
+      case 0:
+        var _loop4 = function () {
+          var z = 3;
+          (function () {
+            return z;
+          });
+          j++;
+          return 1; // break
+        };
+        for (k = 0; k < 10; k++) {
+          if (_loop4()) break;
+        }
+        break;
+    }
+    var z = 3;
+    (function () {
+      return z;
+    });
+  },
+  k;
 for (i = 0; i < 10; i++) {
-  var k;
   _loop3();
 }
 expect(j).toBe(1);
diff --git a/packages/babel-plugin-transform-block-scoping/test/fixtures/general/closure-in-generator-or-async/output.js b/packages/babel-plugin-transform-block-scoping/test/fixtures/general/closure-in-generator-or-async/output.js
index 38820e647c6f..c254921a6721 100644
--- a/packages/babel-plugin-transform-block-scoping/test/fixtures/general/closure-in-generator-or-async/output.js
+++ b/packages/babel-plugin-transform-block-scoping/test/fixtures/general/closure-in-generator-or-async/output.js
@@ -1,38 +1,38 @@
 function* a() {
   var _loop = function* () {
-    var x = yield "iteration";
-    fn = function () {
-      return x;
-    };
-  };
+      var x = yield "iteration";
+      fn = function () {
+        return x;
+      };
+    },
+    fn;
   do {
-    var fn;
     yield* _loop();
   } while (false);
   return fn;
 }
 async function b() {
   var _loop2 = async function () {
-    var x = await "iteration";
-    fn = function () {
-      return x;
-    };
-  };
+      var x = await "iteration";
+      fn = function () {
+        return x;
+      };
+    },
+    fn;
   do {
-    var fn;
     await _loop2();
   } while (false);
   return fn;
 }
 async function* c() {
   var _loop3 = async function* () {
-    var x = yield "iteration";
-    fn = function () {
-      return x;
-    };
-  };
+      var x = yield "iteration";
+      fn = function () {
+        return x;
+      };
+    },
+    fn;
   do {
-    var fn;
     yield* _loop3();
   } while (false);
   return fn;
diff --git a/packages/babel-plugin-transform-block-scoping/test/fixtures/general/for-break-continue-closure/output.js b/packages/babel-plugin-transform-block-scoping/test/fixtures/general/for-break-continue-closure/output.js
index 4c201717d9f3..b40e2e2a4f93 100644
--- a/packages/babel-plugin-transform-block-scoping/test/fixtures/general/for-break-continue-closure/output.js
+++ b/packages/babel-plugin-transform-block-scoping/test/fixtures/general/for-break-continue-closure/output.js
@@ -7,7 +7,7 @@ var _loop = function () {
           return b;
         });
         if (true) break;
-        return "continue";
+        return 1; // continue
       }
     case false:
       {
@@ -16,6 +16,5 @@ var _loop = function () {
   }
 };
 for (var a of [1]) {
-  var _ret = _loop();
-  if (_ret === "continue") continue;
+  if (_loop()) continue;
 }
diff --git a/packages/babel-plugin-transform-block-scoping/test/fixtures/general/for-break-continue-return/output.js b/packages/babel-plugin-transform-block-scoping/test/fixtures/general/for-break-continue-return/output.js
index 5346bb81f0b0..5ddf73940134 100644
--- a/packages/babel-plugin-transform-block-scoping/test/fixtures/general/for-break-continue-return/output.js
+++ b/packages/babel-plugin-transform-block-scoping/test/fixtures/general/for-break-continue-return/output.js
@@ -1,22 +1,23 @@
 (function () {
   var _loop = function (i) {
-    fns.push(function () {
-      return i;
-    });
-    if (i === 1) {
-      return "continue";
-    } else if (i === 2) {
-      return "break";
-    } else if (i === 3) {
-      return {
-        v: i
-      };
-    }
-  };
+      fns.push(function () {
+        return i;
+      });
+      if (i === 1) {
+        return 0; // continue
+      } else if (i === 2) {
+        return 1; // break
+      } else if (i === 3) {
+        return {
+          v: i
+        };
+      }
+    },
+    _ret;
   for (var i in nums) {
-    var _ret = _loop(i);
-    if (_ret === "continue") continue;
-    if (_ret === "break") break;
-    if (typeof _ret === "object") return _ret.v;
+    _ret = _loop(i);
+    if (_ret === 0) continue;
+    if (_ret === 1) break;
+    if (_ret) return _ret.v;
   }
 })();
diff --git a/packages/babel-plugin-transform-block-scoping/test/fixtures/general/for-break/output.js b/packages/babel-plugin-transform-block-scoping/test/fixtures/general/for-break/output.js
index f56ed8ecc53b..e915606befda 100644
--- a/packages/babel-plugin-transform-block-scoping/test/fixtures/general/for-break/output.js
+++ b/packages/babel-plugin-transform-block-scoping/test/fixtures/general/for-break/output.js
@@ -2,9 +2,8 @@ var _loop = function (i) {
   fns.push(function () {
     return i;
   });
-  return "break";
+  return 1; // break
 };
 for (var i in nums) {
-  var _ret = _loop(i);
-  if (_ret === "break") break;
+  if (_loop(i)) break;
 }
diff --git a/packages/babel-plugin-transform-block-scoping/test/fixtures/general/for-continue/output.js b/packages/babel-plugin-transform-block-scoping/test/fixtures/general/for-continue/output.js
index 951ee239e3d0..ce828c5dc878 100644
--- a/packages/babel-plugin-transform-block-scoping/test/fixtures/general/for-continue/output.js
+++ b/packages/babel-plugin-transform-block-scoping/test/fixtures/general/for-continue/output.js
@@ -2,9 +2,8 @@ var _loop = function (i) {
   fns.push(function () {
     return i;
   });
-  return "continue";
+  return 1; // continue
 };
 for (var i in nums) {
-  var _ret = _loop(i);
-  if (_ret === "continue") continue;
+  if (_loop(i)) continue;
 }
diff --git a/packages/babel-plugin-transform-block-scoping/test/fixtures/general/for-return-undefined/output.js b/packages/babel-plugin-transform-block-scoping/test/fixtures/general/for-return-undefined/output.js
index 696a057f2d63..6b79e1925fe5 100644
--- a/packages/babel-plugin-transform-block-scoping/test/fixtures/general/for-return-undefined/output.js
+++ b/packages/babel-plugin-transform-block-scoping/test/fixtures/general/for-return-undefined/output.js
@@ -1,14 +1,15 @@
 (function () {
   var _loop = function (i) {
-    fns.push(function () {
-      return i;
-    });
-    return {
-      v: void 0
-    };
-  };
+      fns.push(function () {
+        return i;
+      });
+      return {
+        v: void 0
+      };
+    },
+    _ret;
   for (var i in nums) {
-    var _ret = _loop(i);
-    if (typeof _ret === "object") return _ret.v;
+    _ret = _loop(i);
+    if (_ret) return _ret.v;
   }
 })();
diff --git a/packages/babel-plugin-transform-block-scoping/test/fixtures/general/for-return/output.js b/packages/babel-plugin-transform-block-scoping/test/fixtures/general/for-return/output.js
index 444319e058af..25523d7caee7 100644
--- a/packages/babel-plugin-transform-block-scoping/test/fixtures/general/for-return/output.js
+++ b/packages/babel-plugin-transform-block-scoping/test/fixtures/general/for-return/output.js
@@ -1,14 +1,15 @@
 (function () {
   var _loop = function (i) {
-    fns.push(function () {
-      return i;
-    });
-    return {
-      v: i
-    };
-  };
+      fns.push(function () {
+        return i;
+      });
+      return {
+        v: i
+      };
+    },
+    _ret;
   for (var i in nums) {
-    var _ret = _loop(i);
-    if (typeof _ret === "object") return _ret.v;
+    _ret = _loop(i);
+    if (_ret) return _ret.v;
   }
 })();
diff --git a/packages/babel-plugin-transform-block-scoping/test/fixtures/general/hoisting/output.js b/packages/babel-plugin-transform-block-scoping/test/fixtures/general/hoisting/output.js
index 389258c3f917..5756895ddd6f 100644
--- a/packages/babel-plugin-transform-block-scoping/test/fixtures/general/hoisting/output.js
+++ b/packages/babel-plugin-transform-block-scoping/test/fixtures/general/hoisting/output.js
@@ -1,20 +1,21 @@
 var _loop = function (i) {
-  x = 5;
-  ({
-    f
-  } = {
-    f: 2
-  });
-  fns.push(function () {
-    return i * x;
-  });
-};
+    x = 5;
+    ({
+      f
+    } = {
+      f: 2
+    });
+    fns.push(function () {
+      return i * x;
+    });
+  },
+  x,
+  f;
 var _iterator = babelHelpers.createForOfIteratorHelper(nums),
   _step;
 try {
   for (_iterator.s(); !(_step = _iterator.n()).done;) {
     var i = _step.value;
-    var x, f;
     _loop(i);
   }
 } catch (err) {
diff --git a/packages/babel-plugin-transform-block-scoping/test/fixtures/general/issue-1051/output.js b/packages/babel-plugin-transform-block-scoping/test/fixtures/general/issue-1051/output.js
index 88b179fe5a75..0d99cb0e69f6 100644
--- a/packages/babel-plugin-transform-block-scoping/test/fixtures/general/issue-1051/output.js
+++ b/packages/babel-plugin-transform-block-scoping/test/fixtures/general/issue-1051/output.js
@@ -7,12 +7,11 @@ foo.func1 = function () {
         func4(function () {
           func2();
         });
-        return "break";
+        return 1; // break
       }
     };
     for (;;) {
-      var _ret = _loop();
-      if (_ret === "break") break;
+      if (_loop()) break;
     }
   }
 };
diff --git a/packages/babel-plugin-transform-block-scoping/test/fixtures/general/label-complex/input.js b/packages/babel-plugin-transform-block-scoping/test/fixtures/general/label-complex/input.js
new file mode 100644
index 000000000000..84b09ba7deba
--- /dev/null
+++ b/packages/babel-plugin-transform-block-scoping/test/fixtures/general/label-complex/input.js
@@ -0,0 +1,13 @@
+outer: while (t) {
+  inner: while (t2) {
+    for (let i = 0; i < 3; i++) {
+      later(() => i);
+      if (test1) break outer;
+      else if (test2) break inner;
+      else if (test3) continue outer;
+      else if (test4) continue inner;
+      else if (test5) break;
+      else if (test6) continue;
+    }
+  }
+}
diff --git a/packages/babel-plugin-transform-block-scoping/test/fixtures/general/label-complex/output.js b/packages/babel-plugin-transform-block-scoping/test/fixtures/general/label-complex/output.js
new file mode 100644
index 000000000000..730a215776a5
--- /dev/null
+++ b/packages/babel-plugin-transform-block-scoping/test/fixtures/general/label-complex/output.js
@@ -0,0 +1,25 @@
+outer: while (t) {
+  inner: while (t2) {
+    var _loop = function (i) {
+        later(function () {
+          return i;
+        });
+        if (test1) return 0; // break outer
+        else if (test2) return 1; // break inner
+        else if (test3) return 2; // continue outer
+        else if (test4) return 3; // continue inner
+        else if (test5) return 4; // break
+        else if (test6) return 5; // continue
+      },
+      _ret;
+    for (var i = 0; i < 3; i++) {
+      _ret = _loop(i);
+      if (_ret === 0) break outer;
+      if (_ret === 1) break inner;
+      if (_ret === 2) continue outer;
+      if (_ret === 3) continue inner;
+      if (_ret === 4) break;
+      if (_ret === 5) continue;
+    }
+  }
+}
diff --git a/packages/babel-plugin-transform-block-scoping/test/fixtures/general/label/output.js b/packages/babel-plugin-transform-block-scoping/test/fixtures/general/label/output.js
index 98f0a12bc6cd..a7684a5ed367 100644
--- a/packages/babel-plugin-transform-block-scoping/test/fixtures/general/label/output.js
+++ b/packages/babel-plugin-transform-block-scoping/test/fixtures/general/label/output.js
@@ -5,10 +5,9 @@ var _loop = function () {
   });
   switch (true) {
     case true:
-      return "break|loop";
+      return 1; // break loop
   }
 };
 loop: for (var i = 0; i < 10; i++) {
-  var _ret = _loop();
-  if (_ret === "break|loop") break loop;
+  if (_loop()) break loop;
 }
diff --git a/packages/babel-plugin-transform-block-scoping/test/fixtures/general/superswitch/output.js b/packages/babel-plugin-transform-block-scoping/test/fixtures/general/superswitch/output.js
index 6cd4d3beb30f..8868488deed7 100644
--- a/packages/babel-plugin-transform-block-scoping/test/fixtures/general/superswitch/output.js
+++ b/packages/babel-plugin-transform-block-scoping/test/fixtures/general/superswitch/output.js
@@ -1,24 +1,25 @@
 function foo() {
   var _loop = function () {
-    switch (2) {
-      case 0:
-        {
-          if (true) {
-            return {
-              v: void 0
-            };
+      switch (2) {
+        case 0:
+          {
+            if (true) {
+              return {
+                v: void 0
+              };
+            }
+            var stuff = new Map();
+            var data = 0;
+            stuff.forEach(function () {
+              var d = data;
+            });
+            break;
           }
-          var stuff = new Map();
-          var data = 0;
-          stuff.forEach(function () {
-            var d = data;
-          });
-          break;
-        }
-    }
-  };
+      }
+    },
+    _ret;
   while (true) {
-    var _ret = _loop();
-    if (typeof _ret === "object") return _ret.v;
+    _ret = _loop();
+    if (_ret) return _ret.v;
   }
 }
diff --git a/packages/babel-plugin-transform-block-scoping/test/fixtures/general/switch-inside-loop/output.js b/packages/babel-plugin-transform-block-scoping/test/fixtures/general/switch-inside-loop/output.js
index 6aebc4bb8a8e..a79ae09809f3 100644
--- a/packages/babel-plugin-transform-block-scoping/test/fixtures/general/switch-inside-loop/output.js
+++ b/packages/babel-plugin-transform-block-scoping/test/fixtures/general/switch-inside-loop/output.js
@@ -20,7 +20,7 @@ var j = 0;
 var _loop2 = function () {
   switch (i) {
     case 0:
-      return "continue";
+      return 1; // continue
   }
   j++;
   var z = 3;
@@ -29,37 +29,35 @@ var _loop2 = function () {
   });
 };
 for (i = 0; i < 10; i++) {
-  var _ret = _loop2();
-  if (_ret === "continue") continue;
+  if (_loop2()) continue;
 }
 expect(j).toBe(9);
 
 // it should work with loops nested within switch
 j = 0;
 var _loop3 = function () {
-  switch (i) {
-    case 0:
-      var _loop4 = function () {
-        var z = 3;
-        (function () {
-          return z;
-        });
-        j++;
-        return "break";
-      };
-      for (k = 0; k < 10; k++) {
-        var _ret2 = _loop4();
-        if (_ret2 === "break") break;
-      }
-      break;
-  }
-  var z = 3;
-  (function () {
-    return z;
-  });
-};
+    switch (i) {
+      case 0:
+        var _loop4 = function () {
+          var z = 3;
+          (function () {
+            return z;
+          });
+          j++;
+          return 1; // break
+        };
+        for (k = 0; k < 10; k++) {
+          if (_loop4()) break;
+        }
+        break;
+    }
+    var z = 3;
+    (function () {
+      return z;
+    });
+  },
+  k;
 for (i = 0; i < 10; i++) {
-  var k;
   _loop3();
 }
 expect(j).toBe(1);
diff --git a/packages/babel-plugin-transform-block-scoping/test/fixtures/general/wrap-closure-shadow-variables-reassignment/output.js b/packages/babel-plugin-transform-block-scoping/test/fixtures/general/wrap-closure-shadow-variables-reassignment/output.js
index efd8a2d1a085..1c34692fe697 100644
--- a/packages/babel-plugin-transform-block-scoping/test/fixtures/general/wrap-closure-shadow-variables-reassignment/output.js
+++ b/packages/babel-plugin-transform-block-scoping/test/fixtures/general/wrap-closure-shadow-variables-reassignment/output.js
@@ -2,7 +2,7 @@ var _loop = function (_index) {
   if (_index % 2) {
     _index += 3;
     index = _index;
-    return "continue";
+    return 1; // continue
   }
   var fn = function () {
     _index;
@@ -10,6 +10,5 @@ var _loop = function (_index) {
   index = _index;
 };
 for (var index = 0; index < 10; index++) {
-  var _ret = _loop(index);
-  if (_ret === "continue") continue;
+  if (_loop(index)) continue;
 }
diff --git a/packages/babel-plugin-transform-parameters/test/fixtures/regression/regression-2364/output.js b/packages/babel-plugin-transform-parameters/test/fixtures/regression/regression-2364/output.js
index ed21d7382e33..7389d619c70c 100644
--- a/packages/babel-plugin-transform-parameters/test/fixtures/regression/regression-2364/output.js
+++ b/packages/babel-plugin-transform-parameters/test/fixtures/regression/regression-2364/output.js
@@ -2,16 +2,17 @@ function wrapper(fn) {
   return function () {
     var _arguments = arguments;
     var _loop = function () {
-      var val = fn(..._arguments);
-      return {
-        v: val.test(function () {
-          console.log(val);
-        })
-      };
-    };
+        var val = fn(..._arguments);
+        return {
+          v: val.test(function () {
+            console.log(val);
+          })
+        };
+      },
+      _ret;
     while (someCondition) {
-      var _ret = _loop();
-      if (typeof _ret === "object") return _ret.v;
+      _ret = _loop();
+      if (_ret) return _ret.v;
     }
   };
 }
diff --git a/packages/babel-plugin-transform-regenerator/test/fixtures/integration/destructuring/input.js b/packages/babel-plugin-transform-regenerator/test/fixtures/integration/destructuring/input.js
new file mode 100644
index 000000000000..47138063fbc9
--- /dev/null
+++ b/packages/babel-plugin-transform-regenerator/test/fixtures/integration/destructuring/input.js
@@ -0,0 +1,57 @@
+function* foo() {
+  var { bar } = { bar: "bar" };
+  return bar;
+}
+
+expect(foo().next().value).toBe("bar");;
+
+function* foo2({ bar = 0 }) {
+  return bar;
+}
+
+expect(foo2({ bar: undefined }).next().value).toBe(0);
+expect(foo2({ bar: 3 }).next().value).toBe(3);
+
+function* foo3() {
+  loop:
+    while(true) {
+      // Changing "let" to "var" makes the tests pass.
+      let { what, value } = yield "iteration";
+
+      switch(what) {
+        case "one":
+          // Removing these 5 lines makes the tests pass.
+          if(value === 1) {
+            break loop;
+          } else if(value === 2) {
+            break loop;
+          }
+          break;
+        case "two":
+          // Removing these 3 lines makes the tests pass.
+          ["a", "b"].map(function(v) {
+            return value + v;
+          });
+
+          break loop;
+          break;
+        case "three":
+          break loop;
+          break;
+      }
+    }
+}
+
+var gen3 = foo3();
+
+expect(gen3.next().value).toBe("iteration");
+expect(gen3.next({what: "one", value: 3}).done).toBe(false);
+expect(gen3.next({what: "one", value: 2}).done).toBe(true);
+
+var gen4 = foo3();
+expect(gen4.next().value).toBe("iteration");
+expect(gen4.next({what: "two", value: "sometext"}).done).toBe(true);
+
+var gen5 = foo3();
+expect(gen5.next().value).toBe("iteration");
+expect(gen5.next({what: "three"}).done).toBe(true);
diff --git a/packages/babel-plugin-transform-regenerator/test/fixtures/integration/destructuring/output.js b/packages/babel-plugin-transform-regenerator/test/fixtures/integration/destructuring/output.js
new file mode 100644
index 000000000000..da91fa6add2e
--- /dev/null
+++ b/packages/babel-plugin-transform-regenerator/test/fixtures/integration/destructuring/output.js
@@ -0,0 +1,130 @@
+var _marked = /*#__PURE__*/babelHelpers.regeneratorRuntime().mark(foo),
+  _marked2 = /*#__PURE__*/babelHelpers.regeneratorRuntime().mark(foo3);
+function foo() {
+  var _bar, bar;
+  return babelHelpers.regeneratorRuntime().wrap(function foo$(_context) {
+    while (1) switch (_context.prev = _context.next) {
+      case 0:
+        _bar = {
+          bar: "bar"
+        }, bar = _bar.bar;
+        return _context.abrupt("return", bar);
+      case 2:
+      case "end":
+        return _context.stop();
+    }
+  }, _marked);
+}
+expect(foo().next().value).toBe("bar");
+;
+function foo2(_ref) {
+  var _ref$bar = _ref.bar,
+    bar = _ref$bar === void 0 ? 0 : _ref$bar;
+  return /*#__PURE__*/babelHelpers.regeneratorRuntime().mark(function _callee() {
+    return babelHelpers.regeneratorRuntime().wrap(function _callee$(_context2) {
+      while (1) switch (_context2.prev = _context2.next) {
+        case 0:
+          return _context2.abrupt("return", bar);
+        case 1:
+        case "end":
+          return _context2.stop();
+      }
+    }, _callee);
+  })();
+}
+expect(foo2({
+  bar: undefined
+}).next().value).toBe(0);
+expect(foo2({
+  bar: 3
+}).next().value).toBe(3);
+function foo3() {
+  var _loop, _ret;
+  return babelHelpers.regeneratorRuntime().wrap(function foo3$(_context4) {
+    while (1) switch (_context4.prev = _context4.next) {
+      case 0:
+        _loop = /*#__PURE__*/babelHelpers.regeneratorRuntime().mark(function _callee2() {
+          var _yield$iteration, what, value;
+          return babelHelpers.regeneratorRuntime().wrap(function _callee2$(_context3) {
+            while (1) switch (_context3.prev = _context3.next) {
+              case 0:
+                _context3.next = 2;
+                return "iteration";
+              case 2:
+                _yield$iteration = _context3.sent;
+                what = _yield$iteration.what;
+                value = _yield$iteration.value;
+                _context3.t0 = what;
+                _context3.next = _context3.t0 === "one" ? 8 : _context3.t0 === "two" ? 15 : _context3.t0 === "three" ? 18 : 20;
+                break;
+              case 8:
+                if (!(value === 1)) {
+                  _context3.next = 12;
+                  break;
+                }
+                return _context3.abrupt("return", 0);
+              case 12:
+                if (!(value === 2)) {
+                  _context3.next = 14;
+                  break;
+                }
+                return _context3.abrupt("return", 0);
+              case 14:
+                return _context3.abrupt("break", 20);
+              case 15:
+                // Removing these 3 lines makes the tests pass.
+                ["a", "b"].map(function (v) {
+                  return value + v;
+                });
+                return _context3.abrupt("return", 0);
+              case 18:
+                return _context3.abrupt("return", 0);
+              case 20:
+              case "end":
+                return _context3.stop();
+            }
+          }, _callee2);
+        });
+      case 1:
+        if (!true) {
+          _context4.next = 8;
+          break;
+        }
+        return _context4.delegateYield(_loop(), "t0", 3);
+      case 3:
+        _ret = _context4.t0;
+        if (!(_ret === 0)) {
+          _context4.next = 6;
+          break;
+        }
+        return _context4.abrupt("break", 8);
+      case 6:
+        _context4.next = 1;
+        break;
+      case 8:
+      case "end":
+        return _context4.stop();
+    }
+  }, _marked2);
+}
+var gen3 = foo3();
+expect(gen3.next().value).toBe("iteration");
+expect(gen3.next({
+  what: "one",
+  value: 3
+}).done).toBe(false);
+expect(gen3.next({
+  what: "one",
+  value: 2
+}).done).toBe(true);
+var gen4 = foo3();
+expect(gen4.next().value).toBe("iteration");
+expect(gen4.next({
+  what: "two",
+  value: "sometext"
+}).done).toBe(true);
+var gen5 = foo3();
+expect(gen5.next().value).toBe("iteration");
+expect(gen5.next({
+  what: "three"
+}).done).toBe(true);