Rename configuration variables controling Python features.

Now of the form MICROPY_PY_*.  See issue #35.

1 files changed, 1 insertions, 1 deletions

diff --git a/py/vm.c b/py/vm.c
index ee2ec2360..1f3f693c9 100644
--- a/py/vm.c
+++ b/py/vm.c
@@ -762,7 +762,7 @@ unwind_jump:
                     sp--;
                     DISPATCH();
 
-#if MICROPY_ENABLE_SLICE
+#if MICROPY_PY_SLICE
                 ENTRY(MP_BC_BUILD_SLICE):
                     DECODE_UINT;
                     if (unum == 2) {