SyntaxError when creating a native coroutine function with name containing 'return'

[smarie]

from makefun import create_function

async def my_native_coroutine_handler(sleep_time):
    await sleep(sleep_time)
    return sleep_time

create_function("foo_returns_bar(sleep_time=2)", my_native_coroutine_handler)

raises

        filename = '<makefun-gen-%d>' % (next(_compile_count),)
        try:
>           code = compile(body, filename, 'single')
E             File "<makefun-gen-11>", line 1
E               async def foo_return awaits_bar(sleep_time=2):
E                                    ^
E           SyntaxError: invalid syntax

..\src\makefun\main.py:714: SyntaxError