[Bug]: `__repr__` TypeError reports wrong type in error message

[jseop-lim]

Description

When __repr__ returns a non-string value, the TypeError message incorrectly reports the type of the object being repr'd, instead of the type of the invalid return value. This is a CPython compatibility issue.

Root Cause

In PyObjectReprAsObjectNode.java#L111, raiseTypeError is called with obj (the object being repr'd) instead of result (the return value of __repr__), so the error message prints the wrong type name. Note that the equivalent __str__ path in PyObjectStrAsObjectNode.java#L128 already correctly passes result.

CPython reference: Objects/object.c#L579-L581

Fix

Pass the __repr__ return value (result) instead of the original object (obj) to raiseTypeError, matching CPython's behavior.

Reproduction

class A:
    def __repr__(self):
        return True

repr(A())

Output

GraalPy:

Traceback (most recent call last):
  File "/tmp/test.py", line 5, in <module>
    repr(A())
TypeError: __repr__ returned non-string (type A)

CPython:

Traceback (most recent call last):
  File "/tmp/test.py", line 5, in <module>
    repr(A())
TypeError: __repr__ returned non-string (type NoneType)

Environment

• GraalPy 25.0.2 (Python 3.12.8)
• CPython 3.12.13
• OS: Debian 12
• CPU: arm64