The file I/O versions of cancelRead and cancelWrite in eventcore currently do not reliably cancel the operation in a synchronous fashion, leading to continued buffer accesses after the cancellation call. In case of the Windows version, this also means that the OVERLAPPED structure can be illegally reused for the next operation, while the previous one hasn't been canceled, yet.
A solution to this issue may require a fundamental change in the file I/O API of eventcore, and the optimal design of that still needs to be worked out. For this reason, we simply avoid using the cancellation functions in vibe-core for now to avoid memory corruption issues. This does mean that interrupting a task that does file I/O won't work anymore.
Many places around were re-inventing logException with varying level of success.
In addition, the full error is now printed as a diagnostic instead of debug.
This is more in line with the description of `LogLevel.diagnostic`
("Extended user information (e.g. for more detailed error information)"),
as opposed to the one of `LogLevel.debug_`
("Developer information useful for algorithm debugging").
Since DMD v2.079.0 it is possible to put default, always-used default parameters
after variadic arguments (as long as IFTI is used).
This way we can move all the compile-time arguments, which would always trigger
a template instantiation, to runtime arguments, and re-enable module and function.
The code as is never checks the requested address family when doing a DNS query,
so resolving an IPv6 only host with AddressFamily.INET would still return an IPv6.
Recently, dub was upgraded from v1.18.0 to v1.22.0
(the remote LATEST file was fixed), which caused half of the test-suite
(all non select-based configs) to fail, because the 'args' test would
somehow run the `0-tcp.d` file.
This works around the problem by using `--single` explicitly.
As explained in details in dlang/dmd#11000 and dlang/dmd#11474,
'in' has been for a very long time lowered to simply 'const',
or 'scope const' when v2.092.0's '-preview=in' switch is used.
DMD PR 11474 aims to change this, so 'in' is not (visibly)
lowered, and shows up in any user-visible string.
This includes header generation, error messages, and stringof.
Since this code was testing stringof directly, it is affected
by the change. To support testing of both aforementioned DMD PRs,
the change is not tied to a version,
but uses the (soon-to-be) old way as a fallback.
This function wasn't used anymore, but still imported, despite being deprecated.
It was scheduled to be removed a few releases ago (see dlang/phobos#7545).
Update the list to include the latest compilers (DMD 2.091.0 and LDC 1.20.1),
as well as the previous 3 releases, plus the oldest supported release.
Also switch from beta to the latest CI version, which is more informative,
but still allow it to fail so as not to block development.
