`make check` failures on windows 7

[liigo]

When I try to compile Rust from latest source.

failures:

---- [run-pass] run-pass/exponential-notation.rs stdout ----

        error: test run failed!
        command: PATH="i686-pc-mingw32/stage2/bin/rustlib/i686-pc-mingw32/lib;;.;D:\MinGW\msys\1.0\local\bin;d:\mingw\bin;D:\MinGW\msys\1.0\bin;c:\Perl64\site\bin;c:\Perl64\bin;c:\Windows\system32;c:\Windows;c:\Windows\System32\Wbem;c:\Windows\System32\WindowsPowerShell\v1.0\;d:\CrossGCC\mips\share;d:\CrossGCC\mips\bin;d:\Program Files\TortoiseSVN\bin;c:\Program Files (x86)\Windows Kits\8.0\Windows Performance Toolkit\;d:\Go\bin;d:\Go\3rd\bin;d:\Program Files (x86)\Git\bin;d:\Program Files\MariaDB 5.5\bin;c:\Program Files\Microsoft SQL Server\110\Tools\Binn\;d:\Programs\lua52;c:\Program Files(x86)\Bitvise SSH Client;d:\Program Files\TortoiseGit\bin;c:\Python27;c:\Python27\Scripts;d:\Liigo\rust\rust-nightly\bin;d:\Program Files (x86)\Microsoft Visual studio\Common\Tools\WinNT;d:\Program Files (x86)\Microsoft Visual Studio\Common
\MSDev98\Bin;d:\Program Files (x86)\Microsoft Visual Studio\Common\Tools;d:\Program Files (x86)\Microsoft Visual Studio\VC98\bin;d:\Program Files (x86)\CMake 2.8\bin;d:\Program Files (x86)\XinAnTong;d:\Programs\Pawn\bin;c:\nasm;i686-pc-ming
w32\stage2\bin\rustlib\i686-pc-mingw32\lib" i686-pc-mingw32\test\run-pass\exponential-notation.stage2-i686-pc-mingw32.exe
        stdout:
        ------------------------------------------

        ------------------------------------------
        stderr:
        ------------------------------------------
        task '<main>' failed at 'called `Option::unwrap()` on a `None` value', D:\MinGW\msys\1.0\home\LIIGO\rust\rust\src\libstd\option.rs:264

        ------------------------------------------

        task '[run-pass] run-pass/exponential-notation.rs' failed at 'explicit failure', D:\MinGW\msys\1.0\home\LIIGO\rust\rust\src\compiletest\runtest.rs:962

---- [run-pass] run-pass/struct-lit-functional-update-no-fields.rs stdout ----
        task '[run-pass] run-pass/struct-lit-functional-update-no-fields.rs' failed at 'failed to exec `i686-pc-mingw32\test\run-pass\struct-lit-functional-update-no-fields.stage2-i686-pc-mingw32.exe`', D:\MinGW\msys\1.0\home\LIIGO\rust\rust\src\libstd\option.rs:245


failures:
    [run-pass] run-pass/exponential-notation.rs
    [run-pass] run-pass/struct-lit-functional-update-no-fields.rs

test result: FAILED. 1387 passed; 2 failed; 50 ignored; 0 measured

task '<main>' failed at 'Some tests failed', D:\MinGW\msys\1.0\home\LIIGO\rust\rust\src\compiletest\compiletest.rs:253
make: *** [tmp/check-stage2-T-i686-pc-mingw32-H-i686-pc-mingw32-rpass.ok] Error 101

[mrec]

I've just built Rust from latest source (for the first time) on Win7-64, and with make check-fast I only get the second of these:

failures:

---- [run-pass] run-pass/struct-lit-functional-update-no-fields.rs stdout ----
        task '[run-pass] run-pass/struct-lit-functional-update-no-fields.rs' fai
led at 'failed to exec `i686-pc-mingw32\test\run-pass\struct-lit-functional-upda
te-no-fields.stage2-i686-pc-mingw32.exe`', C:\msys\home\Mike\rust\src\libstd\opt
ion.rs:245

failures:
    [run-pass] run-pass/struct-lit-functional-update-no-fields.rs

test result: FAILED. 1401 passed; 1 failed; 42 ignored; 0 measured

If I try to run struct-lit-functional-update-no-fields.stage2-i686-pc-mingw32.exe directly from a cmd prompt, I get a UAC prompt. I don't know whether that's expected behaviour or even a sensible thing to try, but I tried the same with a few of the non-failing tests and got a different error (complaining about missing what looks like a temporary test fixture DLL).

[klutzy]

@mrec recent windows (>= 7) triggers UAC if executable has "update" in filename. There was attempt to fix it by adding manifest (#10878) but it was reverted later since it caused some other issues.
What we do now is to rename files if it causes problem. :( #13795 has a patch for it.

[Rufflewind]

Here is a fix/workaround for the bug with exponential-notation.rs.

[alexcrichton]

These tests are both currently running successfully on our windows bots.