Reland of Ship ES2015 sloppy-mode function hoisting, let, class

test/mjsunit/regress/regress-91120.js

Index: test/mjsunit/regress/regress-91120.js
diff --git a/test/mjsunit/regress/regress-91120.js b/test/mjsunit/regress/regress-91120.js
index 117acac6cdcfbb3bd2fe28d84df8c547c7c49d42..73f545648aff8ba7bbdc88f42a8897d4f37c9129 100644
--- a/test/mjsunit/regress/regress-91120.js
+++ b/test/mjsunit/regress/regress-91120.js
@@ -25,24 +25,26 @@
 // (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 // OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 
-// We intend that the function declaration for g inside catch is hoisted to
-// function f's scope.  Invoke it before try/catch, in the try block, in the
-// catch block, after try/catch, and outside f, and verify that it has
-// access to the proper binding of x.
+// With ES2015 function hoisting semantics, functions are only "hoisted" out
+// of blocks by writing their values into var-scoped declarations. Therefore,
+// they access the catch binding when it syntactically appears so.
+// This is a potentially breaking change vs the old semantics, which would
+// return 'function' from g() everywhere.
+
 var x = 'global';
 
 function f() {
   var x = 'function';
-  assertEquals('function', g());
+  assertEquals(undefined, g);
   try {
-    assertEquals('function', g());
+    assertEquals(undefined, g);
     throw 'catch';
   } catch (x) {
     function g() { return x; }
-    assertEquals('function', g());
+    assertEquals('catch', g());
   }
-  assertEquals('function', g());
+  assertEquals('catch', g());
   return g;
 }
 
-assertEquals('function', f()());
+assertEquals('catch', f()());