add more asserts to let scoping exec tests

test/fixtures/syntax/let-scoping/deep-nested/exec.js

@@ -4,5 +4,9 @@ var a = 'var a';
   {
     var c = 'var c';
     let d = 'let d';
+    assert.equal(d, 'let d');
   }
+  assert.throws(function () {
+    d;
+  }, /d is not defined/);
 }

test/fixtures/syntax/let-scoping/for-in-initializers/exec.js

@@ -5,10 +5,9 @@ var result;
   for (var index in let_array) {
     let let_index = index;
     let let_value = let_array[let_index];
-    let_result.push(
-        function() {
-          return [let_index, let_value];
-        });
+    let_result.push(function() {
+      return [let_index, let_value];
+    });
   }
   result = let_result;
 }

test/fixtures/syntax/let-scoping/for-initializers/exec.js

@@ -3,8 +3,24 @@ var result;
   let let_x = 'let x';
   let let_l = [];
   for (var var_x = 1, var_y = 2, var_z = 3; var_x < 10; var_x ++) {
-     let l_x = var_x, l_y = var_y, l_z = var_z;
-     let_l.push( function() { return [ l_x, l_y, l_z ]; } );
+    let l_x = var_x, l_y = var_y, l_z = var_z;
+    let_l.push(function() {
+      return [l_x, l_y, l_z];
+    });
   }
   result = let_l;
 }
+
+assert.deepEqual(result.map(function (fn) {
+  return fn();
+}), [
+  [ 1, 2, 3 ],
+  [ 2, 2, 3 ],
+  [ 3, 2, 3 ],
+  [ 4, 2, 3 ],
+  [ 5, 2, 3 ],
+  [ 6, 2, 3 ],
+  [ 7, 2, 3 ],
+  [ 8, 2, 3 ],
+  [ 9, 2, 3 ]
+]);

test/fixtures/syntax/let-scoping/in-closure/exec.js

@@ -13,9 +13,9 @@ function letInClosure(n) {
 }
 
 var result = letInClosure(10);
-assert.deepEqual(1, result[0]());
-assert.deepEqual(2, result[1]());
-assert.deepEqual(4, result[2]());
-assert.deepEqual(5, result[3]());
-assert.deepEqual(7, result[4]());
-assert.deepEqual(8, result[5]());
+assert.equal(1, result[0]());
+assert.equal(2, result[1]());
+assert.equal(4, result[2]());
+assert.equal(5, result[3]());
+assert.equal(7, result[4]());
+assert.equal(8, result[5]());