[Bug]: list(): negative `__length_hint__` raises TypeError instead of ValueError

[jseop-lim]

Description

When an iterable's __length_hint__() returns a negative integer, GraalPy raises TypeError instead of ValueError. This is a CPython compatibility issue.

Root Cause

IteratorNodes.java#L205 raises TypeError when __length_hint__() returns a negative integer, whereas CPython's PyObject_LengthHint raises ValueError for the same condition. The message text ("__length_hint__() should return >= 0") is identical on both sides — only the exception class differs. The adjacent branch at IteratorNodes.java#L209 correctly uses TypeError for non-integer returns (matching CPython), so only the negative-value branch is wrong.

CPython reference: Objects/abstract.c#L141-L144

// Negative __length_hint__() return raises ValueError, not TypeError
if (res < 0) {
    PyErr_Format(PyExc_ValueError, "__length_hint__() should return >= 0");
    return -1;
}

Reproduction

class NegativeLengthHint:
    def __iter__(self):
        return iter(())

    def __length_hint__(self):
        return -1

list(NegativeLengthHint())

Output

GraalPy:

TypeError: __length_hint__() should return >= 0

CPython:

ValueError: __length_hint__() should return >= 0

Environment

• GraalPy 25.0.2 (Python 3.12.8)
• CPython 3.12.13
• OS: Debian 12