circuitpython/tests/micropython/viper_error.py

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# test syntax and type errors specific to viper code generation
def test(code):
try:
exec(code)
except (SyntaxError, ViperTypeError) as e:
print(repr(e))
# viper: annotations must be identifiers
test("@micropython.viper\ndef f(a:1): pass")
test("@micropython.viper\ndef f() -> 1: pass")
# local used before type known
test("""
@micropython.viper
def f():
print(x)
x = 1
""")
# type mismatch storing to local
test("""
@micropython.viper
def f():
x = 1
y = []
x = y
""")
# can't implicitly convert type to bool
test("""
@micropython.viper
def f():
x = ptr(0)
if x:
pass
""")
# incorrect return type
test("@micropython.viper\ndef f() -> int: return []")
# can't do binary op between incompatible types
test("@micropython.viper\ndef f(): 1 + []")
# can't load
test("@micropython.viper\ndef f(): 1[0]")
test("@micropython.viper\ndef f(): 1[x]")
# can't store
test("@micropython.viper\ndef f(): 1[0] = 1")
test("@micropython.viper\ndef f(): 1[x] = 1")
# must raise an object
test("@micropython.viper\ndef f(): raise 1")