dev-lang/rust-1.23.0-r1 failure

 * Package:    dev-lang/rust-1.23.0-r1
 * Repository: gentoo
 * Maintainer: rust@gentoo.org
 * USE:        abi_x86_64 amd64 elibc_glibc jemalloc kernel_linux userland_GNU
 * FEATURES:   preserve-libs sandbox userpriv usersandbox
>>> Unpacking source...
>>> Unpacking rustc-1.23.0-src.tar.gz to /mass/tmp/portage/dev-lang/rust-1.23.0-r1/work
>>> Unpacking rust-1.22.0-x86_64-unknown-linux-gnu.tar.gz to /mass/tmp/portage/dev-lang/rust-1.23.0-r1/work
>>> Source unpacked in /mass/tmp/portage/dev-lang/rust-1.23.0-r1/work
>>> Preparing source in /mass/tmp/portage/dev-lang/rust-1.23.0-r1/work/rustc-1.23.0-src ...
install: creating uninstall script at /mass/tmp/portage/dev-lang/rust-1.23.0-r1/work/rust-stage0/lib/rustlib/uninstall.sh
install: installing component 'rustc'
install: installing component 'cargo'
install: installing component 'rls-preview'
install: installing component 'rust-analysis-x86_64-unknown-linux-gnu'
install: installing component 'rust-std-x86_64-unknown-linux-gnu'
install: installing component 'rust-docs'

    Rust is ready to roll.

 * Applying 1.23.0-separate-libdir.patch ...
 [ ok ]
>>> Source prepared.
>>> Configuring source in /mass/tmp/portage/dev-lang/rust-1.23.0-r1/work/rustc-1.23.0-src ...
>>> Source configured.
>>> Compiling source in /mass/tmp/portage/dev-lang/rust-1.23.0-r1/work/rustc-1.23.0-src ...
running: /mass/tmp/portage/dev-lang/rust-1.23.0-r1/work/rust-stage0/bin/cargo build --manifest-path /mass/tmp/portage/dev-lang/rust-1.23.0-r1/work/rustc-1.23.0-src/src/bootstrap/Cargo.toml --verbose --verbose --locked --frozen
[m[m[32m[1m   Compiling[m itoa v0.3.4
[m[m[32m[1m   Compiling[m getopts v0.2.15
[m[m[32m[1m   Compiling[m unicode-xid v0.0.4
[m[m[32m[1m   Compiling[m libc v0.2.33
[m[m[32m[1m   Compiling[m quote v0.3.15
[m[m[32m[1m   Compiling[m dtoa v0.4.2
[m[m[32m[1m     Running[m `/mass/tmp/portage/dev-lang/rust-1.23.0-r1/work/rust-stage0/bin/rustc --crate-name itoa src/vendor/itoa/src/lib.rs --crate-type lib --emit=dep-info,link -C debug-assertions=off -C overflow-checks=on -C metadata=a80cecf2368cb1bf -C extra-filename=-a80cecf2368cb1bf --out-dir /mass/tmp/portage/dev-lang/rust-1.23.0-r1/work/rustc-1.23.0-src/build/bootstrap/debug/deps -L dependency=/mass/tmp/portage/dev-lang/rust-1.23.0-r1/work/rustc-1.23.0-src/build/bootstrap/debug/deps --cap-lints warn`
[m[m[32m[1m     Running[m `/mass/tmp/portage/dev-lang/rust-1.23.0-r1/work/rust-stage0/bin/rustc --crate-name getopts src/vendor/getopts/src/lib.rs --crate-type lib --emit=dep-info,link -C debug-assertions=off -C overflow-checks=on -C metadata=8f15832f1875f1e4 -C extra-filename=-8f15832f1875f1e4 --out-dir /mass/tmp/portage/dev-lang/rust-1.23.0-r1/work/rustc-1.23.0-src/build/bootstrap/debug/deps -L dependency=/mass/tmp/portage/dev-lang/rust-1.23.0-r1/work/rustc-1.23.0-src/build/bootstrap/debug/deps --cap-lints warn`
[m[m[32m[1m     Running[m `/mass/tmp/portage/dev-lang/rust-1.23.0-r1/work/rust-stage0/bin/rustc --crate-name unicode_xid src/vendor/unicode-xid/src/lib.rs --crate-type lib --emit=dep-info,link -C debug-assertions=off -C overflow-checks=on --cfg 'feature="default"' -C metadata=acf9f6d2bc307175 -C extra-filename=-acf9f6d2bc307175 --out-dir /mass/tmp/portage/dev-lang/rust-1.23.0-r1/work/rustc-1.23.0-src/build/bootstrap/debug/deps -L dependency=/mass/tmp/portage/dev-lang/rust-1.23.0-r1/work/rustc-1.23.0-src/build/bootstrap/debug/deps --cap-lints warn`
[m[m[32m[1m     Running[m `/mass/tmp/portage/dev-lang/rust-1.23.0-r1/work/rust-stage0/bin/rustc --crate-name libc src/vendor/libc/src/lib.rs --crate-type lib --emit=dep-info,link -C debug-assertions=off -C overflow-checks=on --cfg 'feature="default"' --cfg 'feature="use_std"' -C metadata=dee4189a2df975b6 -C extra-filename=-dee4189a2df975b6 --out-dir /mass/tmp/portage/dev-lang/rust-1.23.0-r1/work/rustc-1.23.0-src/build/bootstrap/debug/deps -L dependency=/mass/tmp/portage/dev-lang/rust-1.23.0-r1/work/rustc-1.23.0-src/build/bootstrap/debug/deps --cap-lints warn`
[m[m[32m[1m     Running[m `/mass/tmp/portage/dev-lang/rust-1.23.0-r1/work/rust-stage0/bin/rustc --crate-name quote src/vendor/quote/src/lib.rs --crate-type lib --emit=dep-info,link -C debug-assertions=off -C overflow-checks=on -C metadata=7cac507f213f51b4 -C extra-filename=-7cac507f213f51b4 --out-dir /mass/tmp/portage/dev-lang/rust-1.23.0-r1/work/rustc-1.23.0-src/build/bootstrap/debug/deps -L dependency=/mass/tmp/portage/dev-lang/rust-1.23.0-r1/work/rustc-1.23.0-src/build/bootstrap/debug/deps --cap-lints warn`
[m[m[32m[1m     Running[m `/mass/tmp/portage/dev-lang/rust-1.23.0-r1/work/rust-stage0/bin/rustc --crate-name dtoa src/vendor/dtoa/src/lib.rs --crate-type lib --emit=dep-info,link -C debug-assertions=off -C overflow-checks=on -C metadata=bb13f4b08901c033 -C extra-filename=-bb13f4b08901c033 --out-dir /mass/tmp/portage/dev-lang/rust-1.23.0-r1/work/rustc-1.23.0-src/build/bootstrap/debug/deps -L dependency=/mass/tmp/portage/dev-lang/rust-1.23.0-r1/work/rustc-1.23.0-src/build/bootstrap/debug/deps --cap-lints warn`
[m[m[32m[1m   Compiling[m lazy_static v0.2.11
[m[m[32m[1m     Running[m `/mass/tmp/portage/dev-lang/rust-1.23.0-r1/work/rust-stage0/bin/rustc --crate-name lazy_static src/vendor/lazy_static/src/lib.rs --crate-type lib --emit=dep-info,link -C debug-assertions=off -C overflow-checks=on -C metadata=a831cb0fbc4e61c1 -C extra-filename=-a831cb0fbc4e61c1 --out-dir /mass/tmp/portage/dev-lang/rust-1.23.0-r1/work/rustc-1.23.0-src/build/bootstrap/debug/deps -L dependency=/mass/tmp/portage/dev-lang/rust-1.23.0-r1/work/rustc-1.23.0-src/build/bootstrap/debug/deps --cap-lints warn`
[m[m[32m[1m   Compiling[m num-traits v0.1.40
[m[m[32m[1m     Running[m `/mass/tmp/portage/dev-lang/rust-1.23.0-r1/work/rust-stage0/bin/rustc --crate-name num_traits src/vendor/num-traits/src/lib.rs --crate-type lib --emit=dep-info,link -C debug-assertions=off -C overflow-checks=on -C metadata=7526866db9d34edb -C extra-filename=-7526866db9d34edb --out-dir /mass/tmp/portage/dev-lang/rust-1.23.0-r1/work/rustc-1.23.0-src/build/bootstrap/debug/deps -L dependency=/mass/tmp/portage/dev-lang/rust-1.23.0-r1/work/rustc-1.23.0-src/build/bootstrap/debug/deps --cap-lints warn`
[m[m[32m[1m   Compiling[m serde v1.0.21
[m[m[32m[1m     Running[m `/mass/tmp/portage/dev-lang/rust-1.23.0-r1/work/rust-stage0/bin/rustc --crate-name serde src/vendor/serde/src/lib.rs --crate-type lib --emit=dep-info,link -C debug-assertions=off -C overflow-checks=on --cfg 'feature="default"' --cfg 'feature="std"' -C metadata=aaa72f0cb232cf9e -C extra-filename=-aaa72f0cb232cf9e --out-dir /mass/tmp/portage/dev-lang/rust-1.23.0-r1/work/rustc-1.23.0-src/build/bootstrap/debug/deps -L dependency=/mass/tmp/portage/dev-lang/rust-1.23.0-r1/work/rustc-1.23.0-src/build/bootstrap/debug/deps --cap-lints warn`
[1m[33mwarning[m[1m: unused macro definition[m
   [m[1m[34m--> [msrc/vendor/num-traits/src/identities.rs:123:1[m
    [m[1m[34m|[m
[1m[34m123[m [m[1m[34m| [m[1m[33m/[m [mmacro_rules! test_wrapping_identities {[m
[1m[34m124[m [m[1m[34m| [m[1m[33m|[m [m    ($($t:ty)+) => {[m
[1m[34m125[m [m[1m[34m| [m[1m[33m|[m [m        $([m
[1m[34m126[m [m[1m[34m| [m[1m[33m|[m [m            assert_eq!(zero::<$t>(), zero::<Wrapping<$t>>().0);[m
[1m[34m...[m   [m[1m[33m|[m
[1m[34m131[m [m[1m[34m| [m[1m[33m|[m [m    };[m
[1m[34m132[m [m[1m[34m| [m[1m[33m|[m [m}[m
    [m[1m[34m| [m[1m[33m|_^[m
    [m[1m[34m|[m
    [m[1m[34m= [m[1mnote[m: #[warn(unused_macros)] on by default[m

[1m[33mwarning[m[1m: unused macro definition[m
  [m[1m[34m--> [msrc/vendor/num-traits/src/bounds.rs:80:1[m
   [m[1m[34m|[m
[1m[34m80[m [m[1m[34m| [m[1m[33m/[m [mmacro_rules! test_wrapping_bounded {[m
[1m[34m81[m [m[1m[34m| [m[1m[33m|[m [m    ($($t:ty)+) => {[m
[1m[34m82[m [m[1m[34m| [m[1m[33m|[m [m        $([m
[1m[34m83[m [m[1m[34m| [m[1m[33m|[m [m            assert_eq!(Wrapping::<$t>::min_value().0, <$t>::min_value());[m
[1m[34m...[m  [m[1m[33m|[m
[1m[34m86[m [m[1m[34m| [m[1m[33m|[m [m    };[m
[1m[34m87[m [m[1m[34m| [m[1m[33m|[m [m}[m
   [m[1m[34m| [m[1m[33m|_^[m

[1m[33mwarning[m[1m: unused macro definition[m
   [m[1m[34m--> [msrc/vendor/num-traits/src/cast.rs:469:1[m
    [m[1m[34m|[m
[1m[34m469[m [m[1m[34m| [m[1m[33m/[m [mmacro_rules! test_wrapping_to_primitive {[m
[1m[34m470[m [m[1m[34m| [m[1m[33m|[m [m    ($($t:ty)+) => {[m
[1m[34m471[m [m[1m[34m| [m[1m[33m|[m [m        $({[m
[1m[34m472[m [m[1m[34m| [m[1m[33m|[m [m            let i: $t = 0;[m
[1m[34m...[m   [m[1m[33m|[m
[1m[34m487[m [m[1m[34m| [m[1m[33m|[m [m    };[m
[1m[34m488[m [m[1m[34m| [m[1m[33m|[m [m}[m
    [m[1m[34m| [m[1m[33m|_^[m

[1m[33mwarning[m[1m: unused macro definition[m
   [m[1m[34m--> [msrc/vendor/num-traits/src/lib.rs:364:1[m
    [m[1m[34m|[m
[1m[34m364[m [m[1m[34m| [m[1m[33m/[m [mmacro_rules! test_wrapping_from_str_radix {[m
[1m[34m365[m [m[1m[34m| [m[1m[33m|[m [m    ($($t:ty)+) => {[m
[1m[34m366[m [m[1m[34m| [m[1m[33m|[m [m        $([m
[1m[34m367[m [m[1m[34m| [m[1m[33m|[m [m            for &(s, r) in &[("42", 10), ("42", 2), ("-13.0", 10), ("foo", 10)] {[m
[1m[34m...[m   [m[1m[33m|[m
[1m[34m372[m [m[1m[34m| [m[1m[33m|[m [m    };[m
[1m[34m373[m [m[1m[34m| [m[1m[33m|[m [m}[m
    [m[1m[34m| [m[1m[33m|_^[m

[m[m[32m[1m   Compiling[m cfg-if v0.1.2
[m[m[32m[1m     Running[m `/mass/tmp/portage/dev-lang/rust-1.23.0-r1/work/rust-stage0/bin/rustc --crate-name cfg_if src/vendor/cfg-if/src/lib.rs --crate-type lib --emit=dep-info,link -C debug-assertions=off -C overflow-checks=on -C metadata=db012289f15ae2ce -C extra-filename=-db012289f15ae2ce --out-dir /mass/tmp/portage/dev-lang/rust-1.23.0-r1/work/rustc-1.23.0-src/build/bootstrap/debug/deps -L dependency=/mass/tmp/portage/dev-lang/rust-1.23.0-r1/work/rustc-1.23.0-src/build/bootstrap/debug/deps --cap-lints warn`
[m[m[32m[1m   Compiling[m cc v1.0.3
[m[m[32m[1m     Running[m `/mass/tmp/portage/dev-lang/rust-1.23.0-r1/work/rust-stage0/bin/rustc --crate-name cc src/vendor/cc/src/lib.rs --crate-type lib --emit=dep-info,link -C debug-assertions=off -C overflow-checks=on -C metadata=35c1f1f62242b9a3 -C extra-filename=-35c1f1f62242b9a3 --out-dir /mass/tmp/portage/dev-lang/rust-1.23.0-r1/work/rustc-1.23.0-src/build/bootstrap/debug/deps -L dependency=/mass/tmp/portage/dev-lang/rust-1.23.0-r1/work/rustc-1.23.0-src/build/bootstrap/debug/deps --cap-lints warn`
[m[m[32m[1m   Compiling[m synom v0.11.3
[m[m[32m[1m     Running[m `/mass/tmp/portage/dev-lang/rust-1.23.0-r1/work/rust-stage0/bin/rustc --crate-name synom src/vendor/synom/src/lib.rs --crate-type lib --emit=dep-info,link -C debug-assertions=off -C overflow-checks=on -C metadata=8c5e0cb6a23d9f48 -C extra-filename=-8c5e0cb6a23d9f48 --out-dir /mass/tmp/portage/dev-lang/rust-1.23.0-r1/work/rustc-1.23.0-src/build/bootstrap/debug/deps -L dependency=/mass/tmp/portage/dev-lang/rust-1.23.0-r1/work/rustc-1.23.0-src/build/bootstrap/debug/deps --extern unicode_xid=/mass/tmp/portage/dev-lang/rust-1.23.0-r1/work/rustc-1.23.0-src/build/bootstrap/debug/deps/libunicode_xid-acf9f6d2bc307175.rlib --cap-lints warn`
[m[m[32m[1m   Compiling[m filetime v0.1.14
[m[m[32m[1m   Compiling[m num_cpus v1.7.0
[m[m[32m[1m     Running[m `/mass/tmp/portage/dev-lang/rust-1.23.0-r1/work/rust-stage0/bin/rustc --crate-name num_cpus src/vendor/num_cpus/src/lib.rs --crate-type lib --emit=dep-info,link -C debug-assertions=off -C overflow-checks=on -C metadata=00ad17de387e25e0 -C extra-filename=-00ad17de387e25e0 --out-dir /mass/tmp/portage/dev-lang/rust-1.23.0-r1/work/rustc-1.23.0-src/build/bootstrap/debug/deps -L dependency=/mass/tmp/portage/dev-lang/rust-1.23.0-r1/work/rustc-1.23.0-src/build/bootstrap/debug/deps --extern libc=/mass/tmp/portage/dev-lang/rust-1.23.0-r1/work/rustc-1.23.0-src/build/bootstrap/debug/deps/liblibc-dee4189a2df975b6.rlib --cap-lints warn`
[m[m[32m[1m     Running[m `/mass/tmp/portage/dev-lang/rust-1.23.0-r1/work/rust-stage0/bin/rustc --crate-name filetime src/vendor/filetime/src/lib.rs --crate-type lib --emit=dep-info,link -C debug-assertions=off -C overflow-checks=on -C metadata=476ebfa5c92c638c -C extra-filename=-476ebfa5c92c638c --out-dir /mass/tmp/portage/dev-lang/rust-1.23.0-r1/work/rustc-1.23.0-src/build/bootstrap/debug/deps -L dependency=/mass/tmp/portage/dev-lang/rust-1.23.0-r1/work/rustc-1.23.0-src/build/bootstrap/debug/deps --extern cfg_if=/mass/tmp/portage/dev-lang/rust-1.23.0-r1/work/rustc-1.23.0-src/build/bootstrap/debug/deps/libcfg_if-db012289f15ae2ce.rlib --extern libc=/mass/tmp/portage/dev-lang/rust-1.23.0-r1/work/rustc-1.23.0-src/build/bootstrap/debug/deps/liblibc-dee4189a2df975b6.rlib --cap-lints warn`
[m[m[32m[1m   Compiling[m syn v0.11.11
[m[m[32m[1m     Running[m `/mass/tmp/portage/dev-lang/rust-1.23.0-r1/work/rust-stage0/bin/rustc --crate-name syn src/vendor/syn/src/lib.rs --crate-type lib --emit=dep-info,link -C debug-assertions=off -C overflow-checks=on --cfg 'feature="default"' --cfg 'feature="parsing"' --cfg 'feature="printing"' --cfg 'feature="quote"' --cfg 'feature="synom"' --cfg 'feature="unicode-xid"' --cfg 'feature="visit"' -C metadata=65416edff42de8f3 -C extra-filename=-65416edff42de8f3 --out-dir /mass/tmp/portage/dev-lang/rust-1.23.0-r1/work/rustc-1.23.0-src/build/bootstrap/debug/deps -L dependency=/mass/tmp/portage/dev-lang/rust-1.23.0-r1/work/rustc-1.23.0-src/build/bootstrap/debug/deps --extern synom=/mass/tmp/portage/dev-lang/rust-1.23.0-r1/work/rustc-1.23.0-src/build/bootstrap/debug/deps/libsynom-8c5e0cb6a23d9f48.rlib --extern quote=/mass/tmp/portage/dev-lang/rust-1.23.0-r1/work/rustc-1.23.0-src/build/bootstrap/debug/deps/libquote-7cac507f213f51b4.rlib --extern unicode_xid=/mass/tmp/portage/dev-lang/rust-1.23.0-r1/work/rustc-1.23.0-src/build/bootstrap/debug/deps/libunicode_xid-acf9f6d2bc307175.rlib --cap-lints warn`
[m[m[32m[1m   Compiling[m build_helper v0.1.0 (file:///mass/tmp/portage/dev-lang/rust-1.23.0-r1/work/rustc-1.23.0-src/src/build_helper)
[m[m[32m[1m     Running[m `/mass/tmp/portage/dev-lang/rust-1.23.0-r1/work/rust-stage0/bin/rustc --crate-name build_helper src/build_helper/lib.rs --crate-type lib --emit=dep-info,link -C debug-assertions=off -C overflow-checks=on -C metadata=a316c3acd468c883 -C extra-filename=-a316c3acd468c883 --out-dir /mass/tmp/portage/dev-lang/rust-1.23.0-r1/work/rustc-1.23.0-src/build/bootstrap/debug/deps -L dependency=/mass/tmp/portage/dev-lang/rust-1.23.0-r1/work/rustc-1.23.0-src/build/bootstrap/debug/deps --extern filetime=/mass/tmp/portage/dev-lang/rust-1.23.0-r1/work/rustc-1.23.0-src/build/bootstrap/debug/deps/libfiletime-476ebfa5c92c638c.rlib`
[m[m[32m[1m   Compiling[m cmake v0.1.28
[m[m[32m[1m     Running[m `/mass/tmp/portage/dev-lang/rust-1.23.0-r1/work/rust-stage0/bin/rustc --crate-name cmake src/vendor/cmake/src/lib.rs --crate-type lib --emit=dep-info,link -C debug-assertions=off -C overflow-checks=on -C metadata=1efba95bb8600bae -C extra-filename=-1efba95bb8600bae --out-dir /mass/tmp/portage/dev-lang/rust-1.23.0-r1/work/rustc-1.23.0-src/build/bootstrap/debug/deps -L dependency=/mass/tmp/portage/dev-lang/rust-1.23.0-r1/work/rustc-1.23.0-src/build/bootstrap/debug/deps --extern cc=/mass/tmp/portage/dev-lang/rust-1.23.0-r1/work/rustc-1.23.0-src/build/bootstrap/debug/deps/libcc-35c1f1f62242b9a3.rlib --cap-lints warn`
[m[m[32m[1m   Compiling[m serde_derive_internals v0.17.0
[m[m[32m[1m     Running[m `/mass/tmp/portage/dev-lang/rust-1.23.0-r1/work/rust-stage0/bin/rustc --crate-name serde_derive_internals src/vendor/serde_derive_internals/src/lib.rs --crate-type lib --emit=dep-info,link -C debug-assertions=off -C overflow-checks=on -C metadata=c664aaf1bb373779 -C extra-filename=-c664aaf1bb373779 --out-dir /mass/tmp/portage/dev-lang/rust-1.23.0-r1/work/rustc-1.23.0-src/build/bootstrap/debug/deps -L dependency=/mass/tmp/portage/dev-lang/rust-1.23.0-r1/work/rustc-1.23.0-src/build/bootstrap/debug/deps --extern syn=/mass/tmp/portage/dev-lang/rust-1.23.0-r1/work/rustc-1.23.0-src/build/bootstrap/debug/deps/libsyn-65416edff42de8f3.rlib --extern synom=/mass/tmp/portage/dev-lang/rust-1.23.0-r1/work/rustc-1.23.0-src/build/bootstrap/debug/deps/libsynom-8c5e0cb6a23d9f48.rlib --cap-lints warn`
[m[m[32m[1m   Compiling[m serde_derive v1.0.21
[m[m[32m[1m     Running[m `/mass/tmp/portage/dev-lang/rust-1.23.0-r1/work/rust-stage0/bin/rustc --crate-name serde_derive src/vendor/serde_derive/src/lib.rs --crate-type proc-macro --emit=dep-info,link -C prefer-dynamic -C debug-assertions=off -C overflow-checks=on -C metadata=7c97efb497e4d3c0 -C extra-filename=-7c97efb497e4d3c0 --out-dir /mass/tmp/portage/dev-lang/rust-1.23.0-r1/work/rustc-1.23.0-src/build/bootstrap/debug/deps -L dependency=/mass/tmp/portage/dev-lang/rust-1.23.0-r1/work/rustc-1.23.0-src/build/bootstrap/debug/deps --extern quote=/mass/tmp/portage/dev-lang/rust-1.23.0-r1/work/rustc-1.23.0-src/build/bootstrap/debug/deps/libquote-7cac507f213f51b4.rlib --extern serde_derive_internals=/mass/tmp/portage/dev-lang/rust-1.23.0-r1/work/rustc-1.23.0-src/build/bootstrap/debug/deps/libserde_derive_internals-c664aaf1bb373779.rlib --extern syn=/mass/tmp/portage/dev-lang/rust-1.23.0-r1/work/rustc-1.23.0-src/build/bootstrap/debug/deps/libsyn-65416edff42de8f3.rlib --cap-lints warn`
[m[m[32m[1m   Compiling[m serde_json v1.0.6
[m[m[32m[1m   Compiling[m toml v0.4.5
[m[m[32m[1m     Running[m `/mass/tmp/portage/dev-lang/rust-1.23.0-r1/work/rust-stage0/bin/rustc --crate-name toml src/vendor/toml/src/lib.rs --crate-type lib --emit=dep-info,link -C debug-assertions=off -C overflow-checks=on -C metadata=e6df84313e551b16 -C extra-filename=-e6df84313e551b16 --out-dir /mass/tmp/portage/dev-lang/rust-1.23.0-r1/work/rustc-1.23.0-src/build/bootstrap/debug/deps -L dependency=/mass/tmp/portage/dev-lang/rust-1.23.0-r1/work/rustc-1.23.0-src/build/bootstrap/debug/deps --extern serde=/mass/tmp/portage/dev-lang/rust-1.23.0-r1/work/rustc-1.23.0-src/build/bootstrap/debug/deps/libserde-aaa72f0cb232cf9e.rlib --cap-lints warn`
[m[m[32m[1m     Running[m `/mass/tmp/portage/dev-lang/rust-1.23.0-r1/work/rust-stage0/bin/rustc --crate-name serde_json src/vendor/serde_json/src/lib.rs --crate-type lib --emit=dep-info,link -C debug-assertions=off -C overflow-checks=on --cfg 'feature="default"' -C metadata=688d2cd27cefde48 -C extra-filename=-688d2cd27cefde48 --out-dir /mass/tmp/portage/dev-lang/rust-1.23.0-r1/work/rustc-1.23.0-src/build/bootstrap/debug/deps -L dependency=/mass/tmp/portage/dev-lang/rust-1.23.0-r1/work/rustc-1.23.0-src/build/bootstrap/debug/deps --extern serde=/mass/tmp/portage/dev-lang/rust-1.23.0-r1/work/rustc-1.23.0-src/build/bootstrap/debug/deps/libserde-aaa72f0cb232cf9e.rlib --extern num_traits=/mass/tmp/portage/dev-lang/rust-1.23.0-r1/work/rustc-1.23.0-src/build/bootstrap/debug/deps/libnum_traits-7526866db9d34edb.rlib --extern itoa=/mass/tmp/portage/dev-lang/rust-1.23.0-r1/work/rustc-1.23.0-src/build/bootstrap/debug/deps/libitoa-a80cecf2368cb1bf.rlib --extern dtoa=/mass/tmp/portage/dev-lang/rust-1.23.0-r1/work/rustc-1.23.0-src/build/bootstrap/debug/deps/libdtoa-bb13f4b08901c033.rlib --cap-lints warn`
[1m[33mwarning[m[1m: variable does not need to be mutable[m
   [m[1m[34m--> [msrc/vendor/toml/src/ser.rs:787:22[m
    [m[1m[34m|[m
[1m[34m787[m [m[1m[34m| [m    fn serialize_f32(mut self, v: f32) -> Result<(), Self::Error> {[m
    [m[1m[34m| [m                     [m[1m[34m---[m[1m[33m^^^^^[m
    [m[1m[34m| [m                     [m[1m[34m|[m
    [m[1m[34m| [m                     [m[1m[34mhelp: remove this `mut`[m
    [m[1m[34m|[m
    [m[1m[34m= [m[1mnote[m: #[warn(unused_mut)] on by default[m

[1m[33mwarning[m[1m: variable does not need to be mutable[m
   [m[1m[34m--> [msrc/vendor/toml/src/ser.rs:803:22[m
    [m[1m[34m|[m
[1m[34m803[m [m[1m[34m| [m    fn serialize_f64(mut self, v: f64) -> Result<(), Self::Error> {[m
    [m[1m[34m| [m                     [m[1m[34m---[m[1m[33m^^^^^[m
    [m[1m[34m| [m                     [m[1m[34m|[m
    [m[1m[34m| [m                     [m[1m[34mhelp: remove this `mut`[m

[1m[33mwarning[m[1m: variable does not need to be mutable[m
   [m[1m[34m--> [msrc/vendor/toml/src/ser.rs:824:22[m
    [m[1m[34m|[m
[1m[34m824[m [m[1m[34m| [m    fn serialize_str(mut self, value: &str) -> Result<(), Self::Error> {[m
    [m[1m[34m| [m                     [m[1m[34m---[m[1m[33m^^^^^[m
    [m[1m[34m| [m                     [m[1m[34m|[m
    [m[1m[34m| [m                     [m[1m[34mhelp: remove this `mut`[m

[1m[33mwarning[m[1m: variable does not need to be mutable[m
   [m[1m[34m--> [msrc/vendor/toml/src/ser.rs:884:22[m
    [m[1m[34m|[m
[1m[34m884[m [m[1m[34m| [m    fn serialize_seq(mut self, len: Option<usize>)[m
    [m[1m[34m| [m                     [m[1m[34m---[m[1m[33m^^^^^[m
    [m[1m[34m| [m                     [m[1m[34m|[m
    [m[1m[34m| [m                     [m[1m[34mhelp: remove this `mut`[m

[1m[33mwarning[m[1m: variable does not need to be mutable[m
   [m[1m[34m--> [msrc/vendor/toml/src/ser.rs:914:22[m
    [m[1m[34m|[m
[1m[34m914[m [m[1m[34m| [m    fn serialize_map(mut self, _len: Option<usize>)[m
    [m[1m[34m| [m                     [m[1m[34m---[m[1m[33m^^^^^[m
    [m[1m[34m| [m                     [m[1m[34m|[m
    [m[1m[34m| [m                     [m[1m[34mhelp: remove this `mut`[m

[1m[33mwarning[m[1m: variable does not need to be mutable[m
   [m[1m[34m--> [msrc/vendor/toml/src/ser.rs:925:25[m
    [m[1m[34m|[m
[1m[34m925[m [m[1m[34m| [m    fn serialize_struct(mut self, name: &'static str, _len: usize)[m
    [m[1m[34m| [m                        [m[1m[34m---[m[1m[33m^^^^^[m
    [m[1m[34m| [m                        [m[1m[34m|[m
    [m[1m[34m| [m                        [m[1m[34mhelp: remove this `mut`[m

[1m[33mwarning[m[1m: variable does not need to be mutable[m
    [m[1m[34m--> [msrc/vendor/toml/src/ser.rs:1053:37[m
     [m[1m[34m|[m
[1m[34m1053[m [m[1m[34m| [m            SerializeTable::Table { mut ser, first, ..  } => {[m
     [m[1m[34m| [m                                    [m[1m[34m---[m[1m[33m^^^^[m
     [m[1m[34m| [m                                    [m[1m[34m|[m
     [m[1m[34m| [m                                    [m[1m[34mhelp: remove this `mut`[m

[1m[33mwarning[m[1m: variable does not need to be mutable[m
    [m[1m[34m--> [msrc/vendor/toml/src/ser.rs:1109:37[m
     [m[1m[34m|[m
[1m[34m1109[m [m[1m[34m| [m            SerializeTable::Table { mut ser, first, ..  } => {[m
     [m[1m[34m| [m                                    [m[1m[34m---[m[1m[33m^^^^[m
     [m[1m[34m| [m                                    [m[1m[34m|[m
     [m[1m[34m| [m                                    [m[1m[34mhelp: remove this `mut`[m

[m[m[32m[1m   Compiling[m bootstrap v0.0.0 (file:///mass/tmp/portage/dev-lang/rust-1.23.0-r1/work/rustc-1.23.0-src/src/bootstrap)
[m[m[32m[1m     Running[m `/mass/tmp/portage/dev-lang/rust-1.23.0-r1/work/rust-stage0/bin/rustc --crate-name bootstrap src/bootstrap/lib.rs --crate-type lib --emit=dep-info,link -C debug-assertions=off -C overflow-checks=on -C metadata=8fd2573c5d9a396e -C extra-filename=-8fd2573c5d9a396e --out-dir /mass/tmp/portage/dev-lang/rust-1.23.0-r1/work/rustc-1.23.0-src/build/bootstrap/debug/deps -L dependency=/mass/tmp/portage/dev-lang/rust-1.23.0-r1/work/rustc-1.23.0-src/build/bootstrap/debug/deps --extern serde_derive=/mass/tmp/portage/dev-lang/rust-1.23.0-r1/work/rustc-1.23.0-src/build/bootstrap/debug/deps/libserde_derive-7c97efb497e4d3c0.so --extern filetime=/mass/tmp/portage/dev-lang/rust-1.23.0-r1/work/rustc-1.23.0-src/build/bootstrap/debug/deps/libfiletime-476ebfa5c92c638c.rlib --extern cc=/mass/tmp/portage/dev-lang/rust-1.23.0-r1/work/rustc-1.23.0-src/build/bootstrap/debug/deps/libcc-35c1f1f62242b9a3.rlib --extern serde_json=/mass/tmp/portage/dev-lang/rust-1.23.0-r1/work/rustc-1.23.0-src/build/bootstrap/debug/deps/libserde_json-688d2cd27cefde48.rlib --extern num_cpus=/mass/tmp/portage/dev-lang/rust-1.23.0-r1/work/rustc-1.23.0-src/build/bootstrap/debug/deps/libnum_cpus-00ad17de387e25e0.rlib --extern lazy_static=/mass/tmp/portage/dev-lang/rust-1.23.0-r1/work/rustc-1.23.0-src/build/bootstrap/debug/deps/liblazy_static-a831cb0fbc4e61c1.rlib --extern getopts=/mass/tmp/portage/dev-lang/rust-1.23.0-r1/work/rustc-1.23.0-src/build/bootstrap/debug/deps/libgetopts-8f15832f1875f1e4.rlib --extern cmake=/mass/tmp/portage/dev-lang/rust-1.23.0-r1/work/rustc-1.23.0-src/build/bootstrap/debug/deps/libcmake-1efba95bb8600bae.rlib --extern build_helper=/mass/tmp/portage/dev-lang/rust-1.23.0-r1/work/rustc-1.23.0-src/build/bootstrap/debug/deps/libbuild_helper-a316c3acd468c883.rlib --extern toml=/mass/tmp/portage/dev-lang/rust-1.23.0-r1/work/rustc-1.23.0-src/build/bootstrap/debug/deps/libtoml-e6df84313e551b16.rlib --extern serde=/mass/tmp/portage/dev-lang/rust-1.23.0-r1/work/rustc-1.23.0-src/build/bootstrap/debug/deps/libserde-aaa72f0cb232cf9e.rlib --extern libc=/mass/tmp/portage/dev-lang/rust-1.23.0-r1/work/rustc-1.23.0-src/build/bootstrap/debug/deps/liblibc-dee4189a2df975b6.rlib`
[m[m[32m[1m     Running[m `/mass/tmp/portage/dev-lang/rust-1.23.0-r1/work/rust-stage0/bin/rustc --crate-name rustc src/bootstrap/bin/rustc.rs --crate-type bin --emit=dep-info,link -C debug-assertions=off -C overflow-checks=on -C metadata=26eddb529cbb4e97 -C extra-filename=-26eddb529cbb4e97 --out-dir /mass/tmp/portage/dev-lang/rust-1.23.0-r1/work/rustc-1.23.0-src/build/bootstrap/debug/deps -L dependency=/mass/tmp/portage/dev-lang/rust-1.23.0-r1/work/rustc-1.23.0-src/build/bootstrap/debug/deps --extern serde_derive=/mass/tmp/portage/dev-lang/rust-1.23.0-r1/work/rustc-1.23.0-src/build/bootstrap/debug/deps/libserde_derive-7c97efb497e4d3c0.so --extern filetime=/mass/tmp/portage/dev-lang/rust-1.23.0-r1/work/rustc-1.23.0-src/build/bootstrap/debug/deps/libfiletime-476ebfa5c92c638c.rlib --extern cc=/mass/tmp/portage/dev-lang/rust-1.23.0-r1/work/rustc-1.23.0-src/build/bootstrap/debug/deps/libcc-35c1f1f62242b9a3.rlib --extern serde_json=/mass/tmp/portage/dev-lang/rust-1.23.0-r1/work/rustc-1.23.0-src/build/bootstrap/debug/deps/libserde_json-688d2cd27cefde48.rlib --extern num_cpus=/mass/tmp/portage/dev-lang/rust-1.23.0-r1/work/rustc-1.23.0-src/build/bootstrap/debug/deps/libnum_cpus-00ad17de387e25e0.rlib --extern lazy_static=/mass/tmp/portage/dev-lang/rust-1.23.0-r1/work/rustc-1.23.0-src/build/bootstrap/debug/deps/liblazy_static-a831cb0fbc4e61c1.rlib --extern getopts=/mass/tmp/portage/dev-lang/rust-1.23.0-r1/work/rustc-1.23.0-src/build/bootstrap/debug/deps/libgetopts-8f15832f1875f1e4.rlib --extern cmake=/mass/tmp/portage/dev-lang/rust-1.23.0-r1/work/rustc-1.23.0-src/build/bootstrap/debug/deps/libcmake-1efba95bb8600bae.rlib --extern build_helper=/mass/tmp/portage/dev-lang/rust-1.23.0-r1/work/rustc-1.23.0-src/build/bootstrap/debug/deps/libbuild_helper-a316c3acd468c883.rlib --extern toml=/mass/tmp/portage/dev-lang/rust-1.23.0-r1/work/rustc-1.23.0-src/build/bootstrap/debug/deps/libtoml-e6df84313e551b16.rlib --extern serde=/mass/tmp/portage/dev-lang/rust-1.23.0-r1/work/rustc-1.23.0-src/build/bootstrap/debug/deps/libserde-aaa72f0cb232cf9e.rlib --extern libc=/mass/tmp/portage/dev-lang/rust-1.23.0-r1/work/rustc-1.23.0-src/build/bootstrap/debug/deps/liblibc-dee4189a2df975b6.rlib --extern bootstrap=/mass/tmp/portage/dev-lang/rust-1.23.0-r1/work/rustc-1.23.0-src/build/bootstrap/debug/deps/libbootstrap-8fd2573c5d9a396e.rlib`
[m[m[32m[1m     Running[m `/mass/tmp/portage/dev-lang/rust-1.23.0-r1/work/rust-stage0/bin/rustc --crate-name rustdoc src/bootstrap/bin/rustdoc.rs --crate-type bin --emit=dep-info,link -C debug-assertions=off -C overflow-checks=on -C metadata=d64d71e6902d993a -C extra-filename=-d64d71e6902d993a --out-dir /mass/tmp/portage/dev-lang/rust-1.23.0-r1/work/rustc-1.23.0-src/build/bootstrap/debug/deps -L dependency=/mass/tmp/portage/dev-lang/rust-1.23.0-r1/work/rustc-1.23.0-src/build/bootstrap/debug/deps --extern serde_derive=/mass/tmp/portage/dev-lang/rust-1.23.0-r1/work/rustc-1.23.0-src/build/bootstrap/debug/deps/libserde_derive-7c97efb497e4d3c0.so --extern filetime=/mass/tmp/portage/dev-lang/rust-1.23.0-r1/work/rustc-1.23.0-src/build/bootstrap/debug/deps/libfiletime-476ebfa5c92c638c.rlib --extern cc=/mass/tmp/portage/dev-lang/rust-1.23.0-r1/work/rustc-1.23.0-src/build/bootstrap/debug/deps/libcc-35c1f1f62242b9a3.rlib --extern serde_json=/mass/tmp/portage/dev-lang/rust-1.23.0-r1/work/rustc-1.23.0-src/build/bootstrap/debug/deps/libserde_json-688d2cd27cefde48.rlib --extern num_cpus=/mass/tmp/portage/dev-lang/rust-1.23.0-r1/work/rustc-1.23.0-src/build/bootstrap/debug/deps/libnum_cpus-00ad17de387e25e0.rlib --extern lazy_static=/mass/tmp/portage/dev-lang/rust-1.23.0-r1/work/rustc-1.23.0-src/build/bootstrap/debug/deps/liblazy_static-a831cb0fbc4e61c1.rlib --extern getopts=/mass/tmp/portage/dev-lang/rust-1.23.0-r1/work/rustc-1.23.0-src/build/bootstrap/debug/deps/libgetopts-8f15832f1875f1e4.rlib --extern cmake=/mass/tmp/portage/dev-lang/rust-1.23.0-r1/work/rustc-1.23.0-src/build/bootstrap/debug/deps/libcmake-1efba95bb8600bae.rlib --extern build_helper=/mass/tmp/portage/dev-lang/rust-1.23.0-r1/work/rustc-1.23.0-src/build/bootstrap/debug/deps/libbuild_helper-a316c3acd468c883.rlib --extern toml=/mass/tmp/portage/dev-lang/rust-1.23.0-r1/work/rustc-1.23.0-src/build/bootstrap/debug/deps/libtoml-e6df84313e551b16.rlib --extern serde=/mass/tmp/portage/dev-lang/rust-1.23.0-r1/work/rustc-1.23.0-src/build/bootstrap/debug/deps/libserde-aaa72f0cb232cf9e.rlib --extern libc=/mass/tmp/portage/dev-lang/rust-1.23.0-r1/work/rustc-1.23.0-src/build/bootstrap/debug/deps/liblibc-dee4189a2df975b6.rlib --extern bootstrap=/mass/tmp/portage/dev-lang/rust-1.23.0-r1/work/rustc-1.23.0-src/build/bootstrap/debug/deps/libbootstrap-8fd2573c5d9a396e.rlib`
[m[m[32m[1m     Running[m `/mass/tmp/portage/dev-lang/rust-1.23.0-r1/work/rust-stage0/bin/rustc --crate-name bootstrap src/bootstrap/bin/main.rs --crate-type bin --emit=dep-info,link -C debug-assertions=off -C overflow-checks=on -C metadata=d9a4cd66f6c327a0 -C extra-filename=-d9a4cd66f6c327a0 --out-dir /mass/tmp/portage/dev-lang/rust-1.23.0-r1/work/rustc-1.23.0-src/build/bootstrap/debug/deps -L dependency=/mass/tmp/portage/dev-lang/rust-1.23.0-r1/work/rustc-1.23.0-src/build/bootstrap/debug/deps --extern serde_derive=/mass/tmp/portage/dev-lang/rust-1.23.0-r1/work/rustc-1.23.0-src/build/bootstrap/debug/deps/libserde_derive-7c97efb497e4d3c0.so --extern filetime=/mass/tmp/portage/dev-lang/rust-1.23.0-r1/work/rustc-1.23.0-src/build/bootstrap/debug/deps/libfiletime-476ebfa5c92c638c.rlib --extern cc=/mass/tmp/portage/dev-lang/rust-1.23.0-r1/work/rustc-1.23.0-src/build/bootstrap/debug/deps/libcc-35c1f1f62242b9a3.rlib --extern serde_json=/mass/tmp/portage/dev-lang/rust-1.23.0-r1/work/rustc-1.23.0-src/build/bootstrap/debug/deps/libserde_json-688d2cd27cefde48.rlib --extern num_cpus=/mass/tmp/portage/dev-lang/rust-1.23.0-r1/work/rustc-1.23.0-src/build/bootstrap/debug/deps/libnum_cpus-00ad17de387e25e0.rlib --extern lazy_static=/mass/tmp/portage/dev-lang/rust-1.23.0-r1/work/rustc-1.23.0-src/build/bootstrap/debug/deps/liblazy_static-a831cb0fbc4e61c1.rlib --extern getopts=/mass/tmp/portage/dev-lang/rust-1.23.0-r1/work/rustc-1.23.0-src/build/bootstrap/debug/deps/libgetopts-8f15832f1875f1e4.rlib --extern cmake=/mass/tmp/portage/dev-lang/rust-1.23.0-r1/work/rustc-1.23.0-src/build/bootstrap/debug/deps/libcmake-1efba95bb8600bae.rlib --extern build_helper=/mass/tmp/portage/dev-lang/rust-1.23.0-r1/work/rustc-1.23.0-src/build/bootstrap/debug/deps/libbuild_helper-a316c3acd468c883.rlib --extern toml=/mass/tmp/portage/dev-lang/rust-1.23.0-r1/work/rustc-1.23.0-src/build/bootstrap/debug/deps/libtoml-e6df84313e551b16.rlib --extern serde=/mass/tmp/portage/dev-lang/rust-1.23.0-r1/work/rustc-1.23.0-src/build/bootstrap/debug/deps/libserde-aaa72f0cb232cf9e.rlib --extern libc=/mass/tmp/portage/dev-lang/rust-1.23.0-r1/work/rustc-1.23.0-src/build/bootstrap/debug/deps/liblibc-dee4189a2df975b6.rlib --extern bootstrap=/mass/tmp/portage/dev-lang/rust-1.23.0-r1/work/rustc-1.23.0-src/build/bootstrap/debug/deps/libbootstrap-8fd2573c5d9a396e.rlib`
[m[m[32m[1m     Running[m `/mass/tmp/portage/dev-lang/rust-1.23.0-r1/work/rust-stage0/bin/rustc --crate-name sccache_plus_cl src/bootstrap/bin/sccache-plus-cl.rs --crate-type bin --emit=dep-info,link -C debug-assertions=off -C overflow-checks=on -C metadata=e79d757dead3eee2 -C extra-filename=-e79d757dead3eee2 --out-dir /mass/tmp/portage/dev-lang/rust-1.23.0-r1/work/rustc-1.23.0-src/build/bootstrap/debug/deps -L dependency=/mass/tmp/portage/dev-lang/rust-1.23.0-r1/work/rustc-1.23.0-src/build/bootstrap/debug/deps --extern serde_derive=/mass/tmp/portage/dev-lang/rust-1.23.0-r1/work/rustc-1.23.0-src/build/bootstrap/debug/deps/libserde_derive-7c97efb497e4d3c0.so --extern filetime=/mass/tmp/portage/dev-lang/rust-1.23.0-r1/work/rustc-1.23.0-src/build/bootstrap/debug/deps/libfiletime-476ebfa5c92c638c.rlib --extern cc=/mass/tmp/portage/dev-lang/rust-1.23.0-r1/work/rustc-1.23.0-src/build/bootstrap/debug/deps/libcc-35c1f1f62242b9a3.rlib --extern serde_json=/mass/tmp/portage/dev-lang/rust-1.23.0-r1/work/rustc-1.23.0-src/build/bootstrap/debug/deps/libserde_json-688d2cd27cefde48.rlib --extern num_cpus=/mass/tmp/portage/dev-lang/rust-1.23.0-r1/work/rustc-1.23.0-src/build/bootstrap/debug/deps/libnum_cpus-00ad17de387e25e0.rlib --extern lazy_static=/mass/tmp/portage/dev-lang/rust-1.23.0-r1/work/rustc-1.23.0-src/build/bootstrap/debug/deps/liblazy_static-a831cb0fbc4e61c1.rlib --extern getopts=/mass/tmp/portage/dev-lang/rust-1.23.0-r1/work/rustc-1.23.0-src/build/bootstrap/debug/deps/libgetopts-8f15832f1875f1e4.rlib --extern cmake=/mass/tmp/portage/dev-lang/rust-1.23.0-r1/work/rustc-1.23.0-src/build/bootstrap/debug/deps/libcmake-1efba95bb8600bae.rlib --extern build_helper=/mass/tmp/portage/dev-lang/rust-1.23.0-r1/work/rustc-1.23.0-src/build/bootstrap/debug/deps/libbuild_helper-a316c3acd468c883.rlib --extern toml=/mass/tmp/portage/dev-lang/rust-1.23.0-r1/work/rustc-1.23.0-src/build/bootstrap/debug/deps/libtoml-e6df84313e551b16.rlib --extern serde=/mass/tmp/portage/dev-lang/rust-1.23.0-r1/work/rustc-1.23.0-src/build/bootstrap/debug/deps/libserde-aaa72f0cb232cf9e.rlib --extern libc=/mass/tmp/portage/dev-lang/rust-1.23.0-r1/work/rustc-1.23.0-src/build/bootstrap/debug/deps/liblibc-dee4189a2df975b6.rlib --extern bootstrap=/mass/tmp/portage/dev-lang/rust-1.23.0-r1/work/rustc-1.23.0-src/build/bootstrap/debug/deps/libbootstrap-8fd2573c5d9a396e.rlib`
[m[m[32m[1m    Finished[m dev [unoptimized] target(s) in 28.66 secs
running: /mass/tmp/portage/dev-lang/rust-1.23.0-r1/work/rustc-1.23.0-src/build/bootstrap/debug/bootstrap build --verbose --config=/mass/tmp/portage/dev-lang/rust-1.23.0-r1/work/rustc-1.23.0-src/config.toml -j7 -l5.5
thread 'main' panicked at 'called `Result::unwrap()` on an `Err` value: ParseIntError { kind: InvalidDigit }', /checkout/src/libcore/result.rs:906:4
note: Run with `RUST_BACKTRACE=1` for a backtrace.
Traceback (most recent call last):
  File "./x.py", line 20, in <module>
    bootstrap.main()
  File "/mass/tmp/portage/dev-lang/rust-1.23.0-r1/work/rustc-1.23.0-src/src/bootstrap/bootstrap.py", line 758, in main
    bootstrap()
  File "/mass/tmp/portage/dev-lang/rust-1.23.0-r1/work/rustc-1.23.0-src/src/bootstrap/bootstrap.py", line 749, in bootstrap
    run(args, env=env, verbose=build.verbose)
  File "/mass/tmp/portage/dev-lang/rust-1.23.0-r1/work/rustc-1.23.0-src/src/bootstrap/bootstrap.py", line 148, in run
    raise RuntimeError(err)
RuntimeError: failed to run: /mass/tmp/portage/dev-lang/rust-1.23.0-r1/work/rustc-1.23.0-src/build/bootstrap/debug/bootstrap build --verbose --config=/mass/tmp/portage/dev-lang/rust-1.23.0-r1/work/rustc-1.23.0-src/config.toml -j7 -l5.5
 * ERROR: dev-lang/rust-1.23.0-r1::gentoo failed (compile phase):
 *   (no error message)
 *
 * Call stack:
 *     ebuild.sh, line 124:  Called src_compile
 *   environment, line 2166:  Called die
 * The specific snippet of code:
 *       ./x.py build --verbose --config="${S}"/config.toml "${MAKEOPTS}" || die
 *
 * If you need support, post the output of `emerge --info '=dev-lang/rust-1.23.0-r1::gentoo'`,
 * the complete build log and the output of `emerge -pqv '=dev-lang/rust-1.23.0-r1::gentoo'`.
 * The complete build log is located at '/var/log/portage/dev-lang:rust-1.23.0-r1:20180131-190038.log'.
 * For convenience, a symlink to the build log is located at '/mass/tmp/portage/dev-lang/rust-1.23.0-r1/temp/build.log'.
 * The ebuild environment file is located at '/mass/tmp/portage/dev-lang/rust-1.23.0-r1/temp/environment'.
 * Working directory: '/mass/tmp/portage/dev-lang/rust-1.23.0-r1/work/rustc-1.23.0-src'
 * S: '/mass/tmp/portage/dev-lang/rust-1.23.0-r1/work/rustc-1.23.0-src'