[INFO] updating cached repository svenstaro/miniserve
[INFO] running `"git" "fetch" "--all"`
[INFO] [stdout] Fetching origin
[INFO] [stderr] From git://github.com/svenstaro/miniserve
[INFO] [stderr]  * branch            HEAD       -> FETCH_HEAD
[INFO] running `"git" "clone" "work/cache/sources/gh/svenstaro/miniserve" "work/ex/beta-1.38-1/sources/1.37.0/gh/svenstaro/miniserve"`
[INFO] [stderr] Cloning into 'work/ex/beta-1.38-1/sources/1.37.0/gh/svenstaro/miniserve'...
[INFO] [stderr] done.
[INFO] running `"git" "clone" "work/cache/sources/gh/svenstaro/miniserve" "work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/svenstaro/miniserve"`
[INFO] [stderr] Cloning into 'work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/svenstaro/miniserve'...
[INFO] [stderr] done.
[INFO] running `"git" "rev-parse" "HEAD"`
[INFO] [stdout] 64b2729318f73dba4a7343f13b0c02ac01162e63
[INFO] sha for GitHub repo svenstaro/miniserve: 64b2729318f73dba4a7343f13b0c02ac01162e63
[INFO] validating manifest of svenstaro/miniserve on toolchain 1.37.0
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+1.37.0" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] validating manifest of svenstaro/miniserve on toolchain beta-2019-08-13
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+beta-2019-08-13" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] started frobbing svenstaro/miniserve
[INFO] finished frobbing svenstaro/miniserve
[INFO] frobbed toml for svenstaro/miniserve written to work/ex/beta-1.38-1/sources/1.37.0/gh/svenstaro/miniserve/Cargo.toml
[INFO] started frobbing svenstaro/miniserve
[INFO] finished frobbing svenstaro/miniserve
[INFO] frobbed toml for svenstaro/miniserve written to work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/svenstaro/miniserve/Cargo.toml
[INFO] crate svenstaro/miniserve already has a lockfile, it will not be regenerated
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+1.37.0" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+beta-2019-08-13" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] testing svenstaro/miniserve against 1.37.0 for beta-1.38-1
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/beta-1.38-1/worker-2/1.37.0:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/beta-1.38-1/sources/1.37.0/gh/svenstaro/miniserve:/opt/crater/workdir:ro,Z" "-v" "/mnt/big/crater/work/local/cargo-home:/opt/crater/cargo-home:ro,Z" "-v" "/mnt/big/crater/work/local/rustup-home:/opt/crater/rustup-home:ro,Z" "-e" "USER_ID=1000" "-e" "SOURCE_DIR=/opt/crater/workdir" "-e" "MAP_USER_ID=1000" "-e" "CARGO_TARGET_DIR=/opt/crater/target" "-e" "CARGO_INCREMENTAL=0" "-e" "RUST_BACKTRACE=full" "-e" "RUSTFLAGS=--cap-lints=warn" "-e" "CARGO_HOME=/opt/crater/cargo-home" "-e" "RUSTUP_HOME=/opt/crater/rustup-home" "-w" "/opt/crater/workdir" "-m" "1536M" "--network" "none" "rustops/crates-build-env" "/opt/crater/cargo-home/bin/cargo" "+1.37.0" "build" "--frozen"`
[INFO] [stdout] 30906aa0e9dfcf2f89b01cc1974e554c7e428fd704553da59bfe5425fb8169a0
[INFO] running `"docker" "start" "-a" "30906aa0e9dfcf2f89b01cc1974e554c7e428fd704553da59bfe5425fb8169a0"`
[INFO] [stderr]    Compiling syn v0.15.34
[INFO] [stderr]    Compiling literalext v0.1.1
[INFO] [stderr]    Compiling backtrace v0.3.18
[INFO] [stderr]    Compiling xattr v0.2.2
[INFO] [stderr]    Compiling filetime v0.2.6
[INFO] [stderr]    Compiling ring v0.13.5
[INFO] [stderr]    Compiling libflate v0.1.23
[INFO] [stderr]    Compiling mio v0.6.17
[INFO] [stderr] error[E0554]: #![feature] may not be used on the stable release channel
[INFO] [stderr]   --> /opt/crater/cargo-home/registry/src/github.com-1ecc6299db9ec823/literalext-0.1.1/src/lib.rs:19:37
[INFO] [stderr]    |
[INFO] [stderr] 19 | #![cfg_attr(feature = "proc-macro", feature(proc_macro))]
[INFO] [stderr]    |                                     ^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] error: aborting due to previous error
[INFO] [stderr] 
[INFO] [stderr] For more information about this error, try `rustc --explain E0554`.
[INFO] [stderr] error: Could not compile `literalext`.
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[INFO] [stderr] error: build failed
[INFO] running `"docker" "inspect" "30906aa0e9dfcf2f89b01cc1974e554c7e428fd704553da59bfe5425fb8169a0"`
[INFO] running `"docker" "rm" "-f" "30906aa0e9dfcf2f89b01cc1974e554c7e428fd704553da59bfe5425fb8169a0"`
[INFO] [stdout] 30906aa0e9dfcf2f89b01cc1974e554c7e428fd704553da59bfe5425fb8169a0