add two generic macros for peeking and setting in the stack
diff --git a/Python/ceval.c b/Python/ceval.c
index dd91f5d..8f46404 100644
--- a/Python/ceval.c
+++ b/Python/ceval.c
@@ -803,10 +803,12 @@
#define SECOND() (stack_pointer[-2])
#define THIRD() (stack_pointer[-3])
#define FOURTH() (stack_pointer[-4])
+#define PEEK(n) (stack_pointer[-(n)])
#define SET_TOP(v) (stack_pointer[-1] = (v))
#define SET_SECOND(v) (stack_pointer[-2] = (v))
#define SET_THIRD(v) (stack_pointer[-3] = (v))
#define SET_FOURTH(v) (stack_pointer[-4] = (v))
+#define SET_VALUE(n, v) (stack_pointer[-(n)] = (v))
#define BASIC_STACKADJ(n) (stack_pointer += n)
#define BASIC_PUSH(v) (*stack_pointer++ = (v))
#define BASIC_POP() (*--stack_pointer)