address comments

Author: bakkot

test/built-ins/Iterator/prototype/drop/argument-validation-failure-closes-underlying.js

@@ -19,6 +19,7 @@ let closable = {
   },
   return() {
     closed = true;
+    return {};
   },
 };
 

test/built-ins/Iterator/prototype/every/argument-validation-failure-closes-underlying.js

@@ -19,6 +19,7 @@ let closable = {
   },
   return() {
     closed = true;
+    return {};
   },
 };
 

test/built-ins/Iterator/prototype/filter/argument-validation-failure-closes-underlying.js

@@ -19,6 +19,7 @@ let closable = {
   },
   return() {
     closed = true;
+    return {};
   },
 };
 

test/built-ins/Iterator/prototype/find/argument-validation-failure-closes-underlying.js

@@ -19,6 +19,7 @@ let closable = {
   },
   return() {
     closed = true;
+    return {};
   },
 };
 

test/built-ins/Iterator/prototype/flatMap/argument-validation-failure-closes-underlying.js

@@ -19,6 +19,7 @@ let closable = {
   },
   return() {
     closed = true;
+    return {};
   },
 };
 

test/built-ins/Iterator/prototype/forEach/argument-validation-failure-closes-underlying.js

@@ -19,6 +19,7 @@ let closable = {
   },
   return() {
     closed = true;
+    return {};
   },
 };
 

test/built-ins/Iterator/prototype/map/argument-validation-failure-closes-underlying.js

@@ -19,6 +19,7 @@ let closable = {
   },
   return() {
     closed = true;
+    return {};
   },
 };
 

test/built-ins/Iterator/prototype/reduce/argument-validation-failure-closes-underlying.js

@@ -19,6 +19,7 @@ let closable = {
   },
   return() {
     closed = true;
+    return {};
   },
 };
 

test/built-ins/Iterator/prototype/reduce/non-callable-reducer.js

@@ -11,12 +11,12 @@ features: [iterator-helpers]
 flags: []
 ---*/
 let nonCallable = {};
-let iterator = (function* () {
+function* gen() {
   yield 1;
-})();
+}
 
 assert.throws(TypeError, function () {
-  iterator.reduce(nonCallable);
+  gen().reduce(nonCallable);
 });
 
-iterator.reduce(() => {});
+gen().reduce(() => {});

test/built-ins/Iterator/prototype/some/argument-validation-failure-closes-underlying.js

@@ -19,6 +19,7 @@ let closable = {
   },
   return() {
     closed = true;
+    return {};
   },
 };
 

test/built-ins/Iterator/prototype/take/argument-validation-failure-closes-underlying.js

@@ -19,6 +19,7 @@ let closable = {
   },
   return() {
     closed = true;
+    return {};
   },
 };