monty 0.0.20

A sandboxed, snapshotable Python interpreter written in Rust.
Documentation 
1
2
3
4
5
6
7
8

# Duplicate parameter names in a function definition are a SyntaxError.
# Previously this panicked the VM at call time because `prepare.rs` sized
# the frame's namespace from the unique name count (HashMap::len) but
# resolved the duplicate to a NamespaceId from the positional index,
# so `load_local` indexed past the allocated stack slots.
def f(x, x):
    return x
# Raise=SyntaxError("duplicate argument 'x' in function definition")