diff --git a/src/macros.py b/src/macros.py
index 7a493ca..bf7119f 100644
--- a/src/macros.py
+++ b/src/macros.py
@@ -82,8 +82,6 @@
 const kMaxYear  = 1000000;
 const kMinMonth = -10000000;
 const kMaxMonth = 10000000;
-const kMinDate  = -100000000;
-const kMaxDate  = 100000000;
 
 # Native cache ids.
 const STRING_TO_REGEXP_CACHE_ID = 0;
@@ -128,6 +126,11 @@
 # we cannot handle those anyway.
 macro IS_SPEC_FUNCTION(arg) = (%_ClassOf(arg) === 'Function');
 
+# Indices in bound function info retrieved by %BoundFunctionGetBindings(...).
+const kBoundFunctionIndex = 0;
+const kBoundThisIndex = 1;
+const kBoundArgumentsStartIndex = 2;
+
 # Inline macros. Use %IS_VAR to make sure arg is evaluated only once.
 macro NUMBER_IS_NAN(arg) = (!%_IsSmi(%IS_VAR(arg)) && !(arg == arg));
 macro NUMBER_IS_FINITE(arg) = (%_IsSmi(%IS_VAR(arg)) || ((arg == arg) && (arg != 1/0) && (arg != -1/0)));