It would be useful for ty to detect cases where a coroutine is called but never awaited — equivalent to mypy's unused-awaitable error code.

async def fetch_data() -> str:
    return "data"

async def main() -> None:
    fetch_data()  # should warn: coroutine is not awaited
    result = fetch_data()  # should warn: result is Coroutine, not str

Python emits RuntimeWarning: coroutine was never awaited at runtime, but catching this statically is much more valuable — especially for large async codebases or sync-to-async migrations where missed awaits are easy to introduce and hard to spot.

Prior art

• mypy: unused-awaitable (opt-in via --enable-error-code=unused-awaitable)
• ruff: astral-sh/ruff#9833 (open, but maintainer comments suggest should be here)
• ty: #198 listed this among mypy error codes to reimplement, but was closed as too broad with a suggestion to file individual issues (no one filed for this though, so I am)

Suggested behavior

I would assume opt-in/warning severity