monty 0.0.21

A sandboxed, snapshotable Python interpreter written in Rust.
Documentation 
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28

# gc-interval=200

# Test that dropping deeply nested containers doesn't crash (stack overflow).
# Heap::dec_ref recurses in Rust when freeing child references, so deeply
# nested containers can overflow the Rust call stack during cleanup.
# CPython handles this fine (its dealloc uses an iterative trashcan mechanism).
# Once fixed (iterative dec_ref), this should work without crashing.

# === Deep list drop ===
x = [1]
for _ in range(10000):
    x = [x]
x = None  # triggers recursive dec_ref chain
assert True

# === Deep tuple drop ===
y = (1,)
for _ in range(10000):
    y = (y,)
y = None  # triggers recursive dec_ref chain
assert True

# === Deep dict drop ===
z = {'a': 1}
for _ in range(10000):
    z = {'a': z}
z = None  # triggers recursive dec_ref chain
assert True