Feat test n option - #1317

We can't just support the three main GOOSes; e.g. CI also covers js and plan9 because some users care about less widespread platforms. At least there should be a fallback file for other platforms that acts as a no-op by returning the mod time.

We need the type assertions to use the _, ok syntax and fall back to the mod time if the type doesn't match, because a custom handler may return an implementation of fs.FileInfo that doesn't contain this type in Sys.

Finally, name these files consistently with os_unix.go, i.e. os_linux.go, os_darwin.go, and so on.

Thanks for the review. I added os_other.go for unhandled platforms, using mod time as a fallback value, and fixed the type assertions to use the _, ok syntax with a mod time fallback.

Changes Made

• actime_*.go → os_*.go
• Added the type assertions with mod time as a fallback return

you're exposing public APIs. make these internal APIs in the interp package

I internalized the actime logic, so it's only accessible via the interp package.

I meant in the actual interp package. I'll tweak this myself and merge it later.

Sorry for the confusion, I misunderstood the req, It's fixed now.

The test fails on Windows. Not sure if the test is too flakey with the sleep, or if it's just incorrect on Windows. I'll have to investigate.

It looks like the real windows does not really support access times by default. I'm making the tests unix-only.