Regression test 20797 depends on /home directory

[bennofs]

The regression tests for issue #20797 needs the /home directory to be present. I hit this problem when trying to build rust master/alpha2 with Nix, which uses chroots for building where /home is not available.

Running make check will produce the following error if no /home directory is present:

executing x86_64-unknown-linux-gnu/test/run-pass/issue-20797.stage2-x86_64-unknown-linux-gnu 
------stdout------------------------------

------stderr------------------------------
thread '<main>' panicked at 'called `Result::unwrap()` on an `Err` value: IoError { kind: FileNotFound, desc: "couldn\'t read directory", detail: Some("no such file or directory (No such file or directory); path=/home") }', /tmp/nix-build-rustc-1.0.0-dev-g91bdf23.drv-0/rust-91bdf23/src/libcore/result.rs:744

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It would be nice if the test suite could be run without needing /home.

[fhahn]

I think this issue was fixed in 212e031 .

Now the walker is not executed and the path is not accessed any more.

[bennofs]

Looks OK. Thanks