The `std` test straightforwardly can't work without file descriptors;
#99417 tracks moving it out of tests/ui.
`issue-13560.rs` requires the target to support dynamic linking.
`extern-mod-syntax` is interesting. The original test was added to check
if `extern mod` could be parsed correctly and used `extern mod std` and
an import:
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|---|---|---|
| .. | ||
| issue-15149.rs | ||
| issue-81357-unsound-file-methods.rs | ||
| stdio-from.rs | ||
| switch-stdout.rs | ||