Warning in `parseIOManagerFlag`
The `nightly-x86_64-linux-deb12-validate+thread_sanitizer_cmm ` job fails with the following warning:
```
rts/IOManager.c: In function ‘parseIOManagerFlag’:
rts/IOManager.c:177:1: error:
error: control reaches end of non-void function [-Werror=return-type]
177 | }
| ^
|
177 | }
| ^
```
It's not immediately apparently what is going on here, but it deserves investigation.
issue