Version Information

• vyper Version (output of vyper --version): 0.4.0b6+commit.7485ceab

Issue description and/or POC

The _compute_reachable_set will recursively call itself with the modified path variable, checking only the root = path[0] variable for every fn_t.called_functions iteration.

if g == root:
    message = " -> ".join([f.name for f in path])
    raise CallViolation(f"Contract contains cyclic function call: {message}")

In the following example, the path list will be [foo, bar, bar, bar, ...], where root is foo, falling into infinite recursion.

@external 
def foo():
    self.bar()

@internal
def bar():
    self.bar()

The error message RecursionError: maximum recursion depth exceeded while calling a Python object

How can it be fixed?