rustc: disable tests for aarch64

[Mic92]

upstream is doing the same

Motivation for this change

Things done

• Tested using sandboxing (nix.useSandbox on NixOS, or option build-use-sandbox in nix.conf on non-NixOS)
• Built on platform(s)
  • NixOS
  • macOS
  • other Linux distributions
• Tested via one or more NixOS test(s) if existing and applicable for the change (look inside nixos/tests)
• Tested compilation of all pkgs that depend on this change using nix-shell -p nox --run "nox-review wip"
• Tested execution of all binary files (usually in ./result/bin/)
• Fits CONTRIBUTING.md.

---

[vcunat]

I'd like the same for staging-18.03, as all of the last several build attempts failed in there (blocking nontrivial number of packages).

[GrahamcOfBorg]

Failure on x86_64-darwin (full log)

Attempted: rustc

Partial log (click to expand)

   Compiling parking_lot_core v0.2.9
   Compiling parking_lot v0.5.3
   Compiling flate2 v1.0.1
   Compiling rustc_data_structures v0.0.0 (file:///private/tmp/nix-build-rustc-1.25.0.drv-0/rustc-1.25.0-src/src/librustc_data_structures)
   Compiling rls-span v0.4.0
   Compiling rls-data v0.15.0
   Compiling syntax_pos v0.0.0 (file:///private/tmp/nix-build-rustc-1.25.0.drv-0/rustc-1.25.0-src/src/libsyntax_pos)
   Compiling rustc_errors v0.0.0 (file:///private/tmp/nix-build-rustc-1.25.0.drv-0/rustc-1.25.0-src/src/librustc_errors)
building of '/nix/store/0xbchrdwp5is09d5pbg1pnx9j1hwlqfb-rustc-1.25.0.drv' timed out after 1800 seconds
�[31;1merror:�[0m build of '/nix/store/0xbchrdwp5is09d5pbg1pnx9j1hwlqfb-rustc-1.25.0.drv' failed

[GrahamcOfBorg]

Failure on aarch64-linux (full log)

Attempted: rustc

Partial log (click to expand)

   Compiling syntax_pos v0.0.0 (file:///build/rustc-1.25.0-src/src/libsyntax_pos)
   Compiling rls-span v0.4.0
   Compiling rls-data v0.15.0
   Compiling rustc_errors v0.0.0 (file:///build/rustc-1.25.0-src/src/librustc_errors)
   Compiling backtrace v0.3.5
   Compiling rustc_const_math v0.0.0 (file:///build/rustc-1.25.0-src/src/librustc_const_math)
   Compiling proc_macro v0.0.0 (file:///build/rustc-1.25.0-src/src/libproc_macro)
   Compiling syntax_ext v0.0.0 (file:///build/rustc-1.25.0-src/src/libsyntax_ext)
building of '/nix/store/87v62806vy0ahlhfqn6ypn8iq1h65qzl-rustc-1.25.0.drv' timed out after 3600 seconds
�[31;1merror:�[0m build of '/nix/store/87v62806vy0ahlhfqn6ypn8iq1h65qzl-rustc-1.25.0.drv' failed

[Mic92]

I will make a pull request for staging-18.03 later, if I don't forget it.

[GrahamcOfBorg]

Success on x86_64-linux (full log)

Attempted: rustc

Partial log (click to expand)

these paths will be fetched (89.08 MiB download, 275.79 MiB unpacked):
  /nix/store/s92vr5q33vry5caipwi2lsqz6zdf9g7c-rustc-1.25.0
copying path '/nix/store/s92vr5q33vry5caipwi2lsqz6zdf9g7c-rustc-1.25.0' from 'https://cache.nixos.org'...
/nix/store/s92vr5q33vry5caipwi2lsqz6zdf9g7c-rustc-1.25.0

[vcunat]

Picked as b694e7b.