py: Allow viper to have type annotations.

Viper functions can now be annotated with the type of their arguments
and return value.  Eg:

@micropython.viper
def f(x:int) -> int:
    return x + 1

2 files changed, 22 insertions, 0 deletions

diff --git a/tests/micropython/viper.py b/tests/micropython/viper.py
new file mode 100644
index 000000000..e1c04784d
--- /dev/null
+++ b/tests/micropython/viper.py
@@ -0,0 +1,20 @@
+import micropython
+
+# viper function taking and returning ints
+@micropython.viper
+def f(x:int, y:int) -> int:
+    return x + y + 3
+
+# viper function taking and returning objects
+@micropython.viper
+def g(x:object, y:object) -> object:
+    return x + y
+
+# this doesn't work at the moment
+#@micropython.viper
+#def g() -> uint:
+#    return -1
+
+print(f(1, 2))
+print(g(1, 2))
+#print(h())
diff --git a/tests/micropython/viper.py.exp b/tests/micropython/viper.py.exp
new file mode 100644
index 000000000..7ea2ad9b2
--- /dev/null
+++ b/tests/micropython/viper.py.exp
@@ -0,0 +1,2 @@
+6
+3