New issue 3047: Internal exception when loading json with unicode escapes
https://bitbucket.org/pypy/pypy/issues/3047/internal-exception-when-loading-json-with
Zihan Zheng:
```
>>>> import json
>>>> json.loads('"\\udc00\\udc00"')
RPython traceback:
File "pypy_interpreter.c", line 42074, in BuiltinCode2_fastcall_2
File "pypy_module__pypyjson.c", line 221, in loads_1
File "pypy_module__pypyjson.c", line 647, in JSONDecoder_decode_any
File "pypy_module__pypyjson.c", line 5884, in
JSONDecoder_decode_string_escaped
File "pypy_module__pypyjson.c", line 8763, in
JSONDecoder_decode_escape_sequence_unicode
File "rpython_rlib.c", line 23815, in unichr_as_utf8
Traceback (most recent call last):
File "<stdin>", line 1, in <module>
File "/usr/local/lib-python/3/json/__init__.py", line 361, in loads
if _pypyjson else _default_decoder.decode(s))
SystemError: unexpected internal exception (please report a bug): <OutOfRange
object at 0x7f787bc22db0>; internal traceback was dumped to stderr
```
Expected result: `'\udc00\udc00'`
PyPy version: PyPy 7.1.1-beta0
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