test: add ErrorAs helper and fix up examples #174
Merged
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This adds an
ErrorAs
helper usingerrors.As
. I've also been getting intermittent failures from FS examples on WSL, so I changed them to usfstest.MapFS
instead of actual files. And while I was working on that, I noticed that VSCode on Windows was only pretending to run the examples because of their GOOS=unix build constraint, so I applied the constraint to only the examples that needed it.