# Buggy code
def unicode_split(a, sep=None, maxsplit=-1):
    if not (
        maxsplit == -1
        or isinstance(maxsplit, (types.Omitted, types.Integer, types.IntegerLiteral))
    ):
        return None  # fail typing if maxsplit is not an integer

    if isinstance(sep, types.UnicodeCharSeq):

        def split_impl(a, sep, maxsplit=1):
            return a.split(str(sep), maxsplit=maxsplit)

        return split_impl

    if isinstance(sep, types.UnicodeType):

        def split_impl(a, sep, maxsplit=-1):
            a_len = len(a)
            sep_len = len(sep)

            if sep_len == 0:
                raise ValueError("empty separator")

            parts = []
            last = 0
            idx = 0

            if sep_len == 1 and maxsplit == -1:
                sep_code_point = _get_code_point(sep, 0)
                for idx in range(a_len):
                    if _get_code_point(a, idx) == sep_code_point:
                        parts.append(a[last:idx])
                        last = idx + 1
            else:
                split_count = 0

                while idx < a_len and (maxsplit == -1 or split_count < maxsplit):
                    if _cmp_region(a, idx, sep, 0, sep_len) == 0:
                        parts.append(a[last:idx])
                        idx += sep_len
                        last = idx
                        split_count += 1
                    else:
                        idx += 1

            if last <= a_len:
                parts.append(a[last:])

            return parts

        return split_impl
    elif (
        sep is None
        or isinstance(sep, types.NoneType)
        or getattr(sep, "value", False) is None
    ):

        def split_whitespace_impl(a, sep=None, maxsplit=-1):
            a_len = len(a)

            parts = []
            last = 0
            idx = 0
            split_count = 0
            in_whitespace_block = True

            for idx in range(a_len):
                code_point = _get_code_point(a, idx)
                is_whitespace = _PyUnicode_IsSpace(code_point)
                if in_whitespace_block:
                    if is_whitespace:
                        pass  # keep consuming space
                    else:
                        last = idx  # this is the start of the next string
                        in_whitespace_block = False
                else:
                    if not is_whitespace:
                        pass  # keep searching for whitespace transition
                    else:
                        parts.append(a[last:idx])
                        in_whitespace_block = True
                        split_count += 1
                        if maxsplit != -1 and split_count == maxsplit:
                            break

            if last <= a_len and not in_whitespace_block:
                parts.append(a[last:])

            return parts

        return split_whitespace_impl


# Traceback (IndexError)
Traceback (most recent call last):
File "/home/ibutygin/miniconda3/envs/NUMBA_CUSTOM/lib/python3.7/site-packages/llvmlite/ir/instructions.py", line 619, in __init__
typ = typ.elements[i]
IndexError: tuple index out of range

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
File "/home/ibutygin/src/numba/numba/numba/errors.py", line 717, in new_error_context
yield
File "/home/ibutygin/src/numba/numba/numba/lowering.py", line 260, in lower_block
self.lower_inst(inst)
File "/home/ibutygin/src/numba/numba/numba/lowering.py", line 303, in lower_inst
val = self.lower_assign(ty, inst)
File "/home/ibutygin/src/numba/numba/numba/lowering.py", line 467, in lower_assign
return self.lower_expr(ty, value)
File "/home/ibutygin/src/numba/numba/numba/lowering.py", line 932, in lower_expr
res = self.lower_call(resty, expr)
File "/home/ibutygin/src/numba/numba/numba/lowering.py", line 724, in lower_call
res = self._lower_call_normal(fnty, expr, signature)
File "/home/ibutygin/src/numba/numba/numba/lowering.py", line 903, in _lower_call_normal
res = impl(self.builder, argvals, self.loc)
File "/home/ibutygin/src/numba/numba/numba/targets/base.py", line 1132, in __call__
res = self._imp(self._context, builder, self._sig, args, loc=loc)
File "/home/ibutygin/src/numba/numba/numba/targets/base.py", line 1157, in wrapper
return fn(*args, **kwargs)
File "/home/ibutygin/src/numba/numba/numba/typing/templates.py", line 778, in method_impl
return call(builder, args)
File "/home/ibutygin/src/numba/numba/numba/targets/base.py", line 1132, in __call__
res = self._imp(self._context, builder, self._sig, args, loc=loc)
File "/home/ibutygin/src/numba/numba/numba/targets/base.py", line 1157, in wrapper
return fn(*args, **kwargs)
File "/home/ibutygin/src/numba/numba/numba/targets/imputils.py", line 193, in imp
builder, func, fndesc.restype, fndesc.argtypes, args)
File "/home/ibutygin/src/numba/numba/numba/targets/callconv.py", line 477, in call_function
args = list(arginfo.as_arguments(builder, args))
File "/home/ibutygin/src/numba/numba/numba/datamodel/packer.py", line 100, in as_arguments
for dm, val in zip(self._dm_args, values)
File "/home/ibutygin/src/numba/numba/numba/datamodel/packer.py", line 100, in <listcomp>
for dm, val in zip(self._dm_args, values)
File "/home/ibutygin/src/numba/numba/numba/datamodel/models.py", line 447, in as_argument
v = builder.extract_value(value, [i])
File "/home/ibutygin/miniconda3/envs/NUMBA_CUSTOM/lib/python3.7/site-packages/llvmlite/ir/builder.py", line 927, in extract_value
instr = instructions.ExtractValue(self.block, agg, idx, name=name)
File "/home/ibutygin/miniconda3/envs/NUMBA_CUSTOM/lib/python3.7/site-packages/llvmlite/ir/instructions.py", line 622, in __init__
% (list(indices), agg.type))
TypeError: Can't index at [0] in {}

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
File "test.py", line 73, in <module>
print(bar(Dummy()))
File "/home/ibutygin/src/numba/numba/numba/dispatcher.py", line 420, in _compile_for_args
raise e
File "/home/ibutygin/src/numba/numba/numba/dispatcher.py", line 353, in _compile_for_args
return self.compile(tuple(argtypes))
File "/home/ibutygin/src/numba/numba/numba/compiler_lock.py", line 32, in _acquire_compile_lock
return func(*args, **kwargs)
File "/home/ibutygin/src/numba/numba/numba/dispatcher.py", line 768, in compile
cres = self._compiler.compile(args, return_type)
File "/home/ibutygin/src/numba/numba/numba/dispatcher.py", line 77, in compile
status, retval = self._compile_cached(args, return_type)
File "/home/ibutygin/src/numba/numba/numba/dispatcher.py", line 91, in _compile_cached
retval = self._compile_core(args, return_type)
File "/home/ibutygin/src/numba/numba/numba/dispatcher.py", line 109, in _compile_core
pipeline_class=self.pipeline_class)
File "/home/ibutygin/src/numba/numba/numba/compiler.py", line 543, in compile_extra
return pipeline.compile_extra(func)
File "/home/ibutygin/src/numba/numba/numba/compiler.py", line 328, in compile_extra
return self._compile_bytecode()
File "/home/ibutygin/src/numba/numba/numba/compiler.py", line 389, in _compile_bytecode
return self._compile_core()
File "/home/ibutygin/src/numba/numba/numba/compiler.py", line 368, in _compile_core
raise e
File "/home/ibutygin/src/numba/numba/numba/compiler.py", line 359, in _compile_core
pm.run(self.state)
File "/home/ibutygin/src/numba/numba/numba/compiler_machinery.py", line 331, in run
raise patched_exception
File "/home/ibutygin/src/numba/numba/numba/compiler_machinery.py", line 322, in run
self._runPass(idx, pass_inst, state)
File "/home/ibutygin/src/numba/numba/numba/compiler_lock.py", line 32, in _acquire_compile_lock
return func(*args, **kwargs)
File "/home/ibutygin/src/numba/numba/numba/compiler_machinery.py", line 281, in _runPass
mutated |= check(pss.run_pass, internal_state)
File "/home/ibutygin/src/numba/numba/numba/compiler_machinery.py", line 268, in check
mangled = func(compiler_state)
File "/home/ibutygin/src/numba/numba/numba/typed_passes.py", line 391, in run_pass
NativeLowering().run_pass(state)
File "/home/ibutygin/src/numba/numba/numba/typed_passes.py", line 333, in run_pass
lower.lower()
File "/home/ibutygin/src/numba/numba/numba/lowering.py", line 179, in lower
self.lower_normal_function(self.fndesc)
File "/home/ibutygin/src/numba/numba/numba/lowering.py", line 220, in lower_normal_function
entry_block_tail = self.lower_function_body()
File "/home/ibutygin/src/numba/numba/numba/lowering.py", line 245, in lower_function_body
self.lower_block(block)
File "/home/ibutygin/src/numba/numba/numba/lowering.py", line 260, in lower_block
self.lower_inst(inst)
File "/home/ibutygin/miniconda3/envs/NUMBA_CUSTOM/lib/python3.7/contextlib.py", line 130, in __exit__
self.gen.throw(type, value, traceback)
File "/home/ibutygin/src/numba/numba/numba/errors.py", line 725, in new_error_context
six.reraise(type(newerr), newerr, tb)
File "/home/ibutygin/src/numba/numba/numba/six.py", line 669, in reraise
raise value
numba.errors.LoweringError: Failed in nopython mode pipeline (step: nopython mode backend)
Can't index at [0] in {}

File "test.py", line 71:
def bar(obj):
return obj.inline_method(123,456)
^

[1] During: lowering "$10call_method.4 = call $4load_method.1($const6.2, $const8.3, func=$4load_method.1, args=[Var($const6.2, test.py:71), Var($const8.3, test.py:71)], kws=(), vararg=None)" at test.py (71)

# Fixed code
def unicode_split(a, sep=None, maxsplit=-1):
    if not (
        maxsplit == -1
        or isinstance(maxsplit, (types.Omitted, types.Integer, types.IntegerLiteral))
    ):
        return None  # fail typing if maxsplit is not an integer

    if isinstance(sep, types.UnicodeCharSeq):

        def split_impl(a, sep=None, maxsplit=-1):
            return a.split(str(sep), maxsplit=maxsplit)

        return split_impl

    if isinstance(sep, types.UnicodeType):

        def split_impl(a, sep=None, maxsplit=-1):
            a_len = len(a)
            sep_len = len(sep)

            if sep_len == 0:
                raise ValueError("empty separator")

            parts = []
            last = 0
            idx = 0

            if sep_len == 1 and maxsplit == -1:
                sep_code_point = _get_code_point(sep, 0)
                for idx in range(a_len):
                    if _get_code_point(a, idx) == sep_code_point:
                        parts.append(a[last:idx])
                        last = idx + 1
            else:
                split_count = 0

                while idx < a_len and (maxsplit == -1 or split_count < maxsplit):
                    if _cmp_region(a, idx, sep, 0, sep_len) == 0:
                        parts.append(a[last:idx])
                        idx += sep_len
                        last = idx
                        split_count += 1
                    else:
                        idx += 1

            if last <= a_len:
                parts.append(a[last:])

            return parts

        return split_impl
    elif (
        sep is None
        or isinstance(sep, types.NoneType)
        or getattr(sep, "value", False) is None
    ):

        def split_whitespace_impl(a, sep=None, maxsplit=-1):
            a_len = len(a)

            parts = []
            last = 0
            idx = 0
            split_count = 0
            in_whitespace_block = True

            for idx in range(a_len):
                code_point = _get_code_point(a, idx)
                is_whitespace = _PyUnicode_IsSpace(code_point)
                if in_whitespace_block:
                    if is_whitespace:
                        pass  # keep consuming space
                    else:
                        last = idx  # this is the start of the next string
                        in_whitespace_block = False
                else:
                    if not is_whitespace:
                        pass  # keep searching for whitespace transition
                    else:
                        parts.append(a[last:idx])
                        in_whitespace_block = True
                        split_count += 1
                        if maxsplit != -1 and split_count == maxsplit:
                            break

            if last <= a_len and not in_whitespace_block:
                parts.append(a[last:])

            return parts

        return split_whitespace_impl