unused-coroutine could catch a common bug #5151

Describe the Bug

More of a feature request than a bug, but there's a common bug pattern that could be caught, likely should go under the unused-coroutine check. Basically this:

async def foo() -> bool: ...

async def bar():
    if foo():
        print("always evaluates to True! foo should have been awaited")

This does get caught as a runtime error when things get GC'd, and does technically get caught by the implicit-bool checker, but I think that general implicit conversions to bool are pretty common. But implicitly converting a coroutine to bool seems like almost universally an error.

Sandbox Link

https://pyrefly.org/sandbox/?project=v2.pZXPboMwDMZfxS0HLtty722XSZN62ANwCRAgGsUTSYr29vtsYKP7U03qDQj-nPj72flrZH5v5a21DfPsbIkGXss0w_Jkgcg_QIDdqnKgTAZK7ytwUfGw1o4bvI2cogfykTXTHU2c-hot_arfKhurjmIH4CePyqdInT3LjMciGCl9TY_H42_68H2FeKGm2Nt-su_wXni3qJ6oCD472SkF6CM3EjgqnQMmgrKri70i-ROGjF7mD7TUVdI3vk0YttjBQzFkmLOOuhjfwsGYNZzH1rjB1FwFcxFh5Exkz9brCL-UI1Z4A2RvoTCfIcyvMZgLgvhDDvCcL3bI1tSJT1983EmaFBD_ZeUWYRHQGA2QmwXXWgkXm962gbB3rA54ip0FiaOYDnU-nbAkCZOmc4OWw0fRW72-F2A22a72wAc

(Only applicable for extension issues) IDE Information

No response