"make check" error on Arch Linux "make[1]: *** [libharfbuzz.dummy] Error 101"

[RunningDroid]

make check

make[1]: Entering directory `/home/runningdroid/testing/servo/build/src/rust-harfbuzz'
rustc -O  /home/runningdroid/testing/servo/src/rust-harfbuzz/harfbuzz.rc -o libharfbuzz.dummy
error: internal compiler error: unexpected failure
note: the compiler hit an unexpected failure path. this is a bug
note: try running with RUST_LOG=rustc=0,::rt::backtrace to get further details and report the results to github.com/mozilla/rust/issues
make[1]: *** [libharfbuzz.dummy] Error 101
make[1]: Leaving directory `/home/runningdroid/testing/servo/build/src/rust-harfbuzz'
make: *** [/home/runningdroid/testing/servo/build/src/rust-harfbuzz/rust-harfbuzz.dummy] Error 2

make check-servo RUST_LOG=rustc=0,::rt::backtrace

make[1]: Entering directory `/home/runningdroid/testing/servo/build/src/rust-harfbuzz'
rustc -O  /home/runningdroid/testing/servo/src/rust-harfbuzz/harfbuzz.rc -o libharfbuzz.dummy
rust: task failed at 'can't determine value for sysroot', /var/aurget/src/rust-git/src/rust-build/src/rustc/metadata/filesearch.rs:104
/usr/lib/rustc/x86_64-unknown-linux-gnu/lib/librustrt.so(_ZN9rust_task13begin_failureEPKcS1_m+0x5d)[0x7f45d87a3f8d]
/usr/lib/rustc/x86_64-unknown-linux-gnu/lib/librustrt.so(+0x34dbd)[0x7f45d87bddbd]
/usr/lib/rustc/x86_64-unknown-linux-gnu/lib/librustrt.so(upcall_fail+0x1a8)[0x7f45d87a6898]
/usr/lib/rustc/x86_64-unknown-linux-gnu/lib/librustc-c84825241471686d-0.4.so(+0x69c285)[0x7f45d908c285]
/usr/lib/rustc/x86_64-unknown-linux-gnu/lib/librustc-c84825241471686d-0.4.so(_ZN8metadata10filesearch13mk_filesearch16_2f4813d5be6e9063_04E+0x8d)[0x7f45d908b09d]
/usr/lib/rustc/x86_64-unknown-linux-gnu/lib/librustc-c84825241471686d-0.4.so(_ZN6driver6driver14build_session_17_fd91e7d0f2aafe413_04E+0xa2)[0x7f45d909dc42]
/usr/lib/rustc/x86_64-unknown-linux-gnu/lib/librustc-c84825241471686d-0.4.so(_ZN6driver6driver13build_session16_8e30be84d12dc363_04E+0xb1)[0x7f45d909da01]
rustc[0x407c0f]
rustc[0x411e34]
rustc[0x40ed63]
rustc[0x40d9e8]
/usr/lib/rustc/x86_64-unknown-linux-gnu/lib/libcore-c3ca5d77d81b46c1-0.4.so(+0x76687)[0x7f45d9e0f687]
/usr/lib/rustc/x86_64-unknown-linux-gnu/lib/libcore-c3ca5d77d81b46c1-0.4.so(+0xb7154)[0x7f45d9e50154]
/usr/lib/rustc/x86_64-unknown-linux-gnu/lib/librustrt.so(_Z18task_start_wrapperP10spawn_args+0x24)[0x7f45d87a4734]
error: internal compiler error: unexpected failure
note: the compiler hit an unexpected failure path. this is a bug
note: try running with RUST_LOG=rustc=0,::rt::backtrace to get further details and report the results to github.com/mozilla/rust/issues
rust: task failed at 'explicit failure', /var/aurget/src/rust-git/src/rust-build/src/rustc/driver/rustc.rs:283
/usr/lib/rustc/x86_64-unknown-linux-gnu/lib/librustrt.so(_ZN9rust_task13begin_failureEPKcS1_m+0x5d)[0x7f45d87a3f8d]
/usr/lib/rustc/x86_64-unknown-linux-gnu/lib/librustrt.so(+0x34dbd)[0x7f45d87bddbd]
/usr/lib/rustc/x86_64-unknown-linux-gnu/lib/librustrt.so(upcall_fail+0x1a8)[0x7f45d87a6898]
rustc[0x40cf0b]
rustc[0x411e34]
rustc[0x4119e8]
/usr/lib/rustc/x86_64-unknown-linux-gnu/lib/librustrt.so(_Z18task_start_wrapperP10spawn_args+0x24)[0x7f45d87a4734]
rust: domain main @0x20041c0 root task failed
rust: task failed at 'killed', /var/aurget/src/rust-git/src/rust-build/src/libcore/task.rs:781
/usr/lib/rustc/x86_64-unknown-linux-gnu/lib/librustrt.so(_ZN9rust_task13begin_failureEPKcS1_m+0x5d)[0x7f45d87a3f8d]
/usr/lib/rustc/x86_64-unknown-linux-gnu/lib/librustrt.so(+0x34dbd)[0x7f45d87bddbd]
/usr/lib/rustc/x86_64-unknown-linux-gnu/lib/librustrt.so(upcall_fail+0x1a8)[0x7f45d87a6898]
/usr/lib/rustc/x86_64-unknown-linux-gnu/lib/libcore-c3ca5d77d81b46c1-0.4.so(_ZN4task5yield16_9531951b4f79f8b3_04E+0xc4)[0x7f45d9df8af4]
/usr/lib/rustc/x86_64-unknown-linux-gnu/lib/libcore-c3ca5d77d81b46c1-0.4.so(+0x9200e)[0x7f45d9e2b00e]
/usr/lib/rustc/x86_64-unknown-linux-gnu/lib/libcore-c3ca5d77d81b46c1-0.4.so(_ZN7private11weaken_task17_d15522f384beb8853_04E+0xc4)[0x7f45d9e2ae84]
/usr/lib/rustc/x86_64-unknown-linux-gnu/lib/libcore-c3ca5d77d81b46c1-0.4.so(+0x91db5)[0x7f45d9e2adb5]
/usr/lib/rustc/x86_64-unknown-linux-gnu/lib/libcore-c3ca5d77d81b46c1-0.4.so(+0xb7154)[0x7f45d9e50154]
/usr/lib/rustc/x86_64-unknown-linux-gnu/lib/libcore-c3ca5d77d81b46c1-0.4.so(+0x91151)[0x7f45d9e2a151]
/usr/lib/rustc/x86_64-unknown-linux-gnu/lib/libcore-c3ca5d77d81b46c1-0.4.so(+0x901b6)[0x7f45d9e291b6]
/usr/lib/rustc/x86_64-unknown-linux-gnu/lib/libcore-c3ca5d77d81b46c1-0.4.so(+0x76687)[0x7f45d9e0f687]
/usr/lib/rustc/x86_64-unknown-linux-gnu/lib/libcore-c3ca5d77d81b46c1-0.4.so(+0xb7154)[0x7f45d9e50154]
/usr/lib/rustc/x86_64-unknown-linux-gnu/lib/librustrt.so(_Z18task_start_wrapperP10spawn_args+0x24)[0x7f45d87a4734]
make[1]: *** [libharfbuzz.dummy] Error 101
make[1]: Leaving directory `/home/runningdroid/testing/servo/build/src/rust-harfbuzz'
make: *** [/home/runningdroid/testing/servo/build/src/rust-harfbuzz/rust-harfbuzz.dummy] Error 2

[burg]

This seems to be distinct from Rust Issue #3592 (rust-lang/rust#3592)

[burg]

@RunningDroid, this is an upstream bug in Rust. Can you look at rust-lang/rust#1711 and try performing the diagnostic that was suggested?