[INFO] fetching crate expression-closed01 0.2.1...
[INFO] testing expression-closed01-0.2.1 against beta-2020-06-03 for beta-1.45-1
[INFO] extracting crate expression-closed01 0.2.1 into /workspace/builds/worker-8/source
[INFO] validating manifest of crates.io crate expression-closed01 0.2.1 on toolchain beta-2020-06-03
[INFO] running `"/workspace/cargo-home/bin/cargo" "+beta-2020-06-03" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] started tweaking crates.io crate expression-closed01 0.2.1
[INFO] finished tweaking crates.io crate expression-closed01 0.2.1
[INFO] tweaked toml for crates.io crate expression-closed01 0.2.1 written to /workspace/builds/worker-8/source/Cargo.toml
[INFO] running `"/workspace/cargo-home/bin/cargo" "+beta-2020-06-03" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update"`
[INFO] running `"/workspace/cargo-home/bin/cargo" "+beta-2020-06-03" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] [stderr]  Downloading crates ...
[INFO] [stderr]   Downloaded closed01 v0.3.0
[INFO] [stderr]   Downloaded asexp v0.2.0
[INFO] running `"docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-8/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-8/source:/opt/rustwide/workdir:ro,Z" "-v" "/var/lib/crater-agent-workspace/cargo-home:/opt/rustwide/cargo-home:ro,Z" "-v" "/var/lib/crater-agent-workspace/rustup-home:/opt/rustwide/rustup-home:ro,Z" "-e" "SOURCE_DIR=/opt/rustwide/workdir" "-e" "MAP_USER_ID=0" "-e" "CARGO_TARGET_DIR=/opt/rustwide/target" "-e" "CARGO_INCREMENTAL=0" "-e" "RUST_BACKTRACE=full" "-e" "RUSTFLAGS=--cap-lints=warn" "-e" "CARGO_HOME=/opt/rustwide/cargo-home" "-e" "RUSTUP_HOME=/opt/rustwide/rustup-home" "-w" "/opt/rustwide/workdir" "-m" "1610612736" "--network" "none" "rustops/crates-build-env" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2020-06-03" "build" "--frozen"`
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] [stdout] ef28ec147cc2d8f096af0f49062b35fa3931d0eff47a28ae8f8daa00ce16951f
[INFO] running `"docker" "start" "-a" "ef28ec147cc2d8f096af0f49062b35fa3931d0eff47a28ae8f8daa00ce16951f"`
[INFO] [stderr] sudo: setrlimit(RLIMIT_CORE): Operation not permitted
[INFO] [stderr]    Compiling asexp v0.3.2
[INFO] [stderr]    Compiling asexp v0.2.0
[INFO] [stderr]    Compiling closed01 v0.3.0
[INFO] [stderr] error[E0554]: `#![feature]` may not be used on the beta release channel
[INFO] [stderr]  --> /opt/rustwide/cargo-home/registry/src/github.com-1ecc6299db9ec823/asexp-0.2.0/src/lib.rs:1:1
[INFO] [stderr]   |
[INFO] [stderr] 1 | #![feature(str_char)]
[INFO] [stderr]   | ^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] error[E0599]: no method named `slice_shift_char` found for reference `&str` in the current scope
[INFO] [stderr]    --> /opt/rustwide/cargo-home/registry/src/github.com-1ecc6299db9ec823/asexp-0.2.0/src/atom.rs:109:13
[INFO] [stderr]     |
[INFO] [stderr] 109 |     match s.slice_shift_char() {
[INFO] [stderr]     |             ^^^^^^^^^^^^^^^^ method not found in `&str`
[INFO] [stderr] 
[INFO] [stderr] error[E0599]: no method named `slice_shift_char` found for reference `&'a str` in the current scope
[INFO] [stderr]   --> /opt/rustwide/cargo-home/registry/src/github.com-1ecc6299db9ec823/asexp-0.2.0/src/token.rs:58:13
[INFO] [stderr]    |
[INFO] [stderr] 58 |     match s.slice_shift_char() {
[INFO] [stderr]    |             ^^^^^^^^^^^^^^^^ method not found in `&'a str`
[INFO] [stderr] 
[INFO] [stderr] error[E0599]: no method named `slice_shift_char` found for reference `&str` in the current scope
[INFO] [stderr]   --> /opt/rustwide/cargo-home/registry/src/github.com-1ecc6299db9ec823/asexp-0.2.0/src/token.rs:82:36
[INFO] [stderr]    |
[INFO] [stderr] 82 |                         match rest.slice_shift_char() {
[INFO] [stderr]    |                                    ^^^^^^^^^^^^^^^^ method not found in `&str`
[INFO] [stderr] 
[INFO] [stderr] error[E0599]: no method named `slice_shift_char` found for reference `&str` in the current scope
[INFO] [stderr]   --> /opt/rustwide/cargo-home/registry/src/github.com-1ecc6299db9ec823/asexp-0.2.0/src/token.rs:97:52
[INFO] [stderr]    |
[INFO] [stderr] 97 | ...                   match rest.slice_shift_char() {
[INFO] [stderr]    |                                  ^^^^^^^^^^^^^^^^ method not found in `&str`
[INFO] [stderr] 
[INFO] [stderr] error[E0599]: no method named `slice_shift_char` found for reference `&str` in the current scope
[INFO] [stderr]    --> /opt/rustwide/cargo-home/registry/src/github.com-1ecc6299db9ec823/asexp-0.2.0/src/token.rs:137:30
[INFO] [stderr]     |
[INFO] [stderr] 137 |                     match s2.slice_shift_char() {
[INFO] [stderr]     |                              ^^^^^^^^^^^^^^^^ method not found in `&str`
[INFO] [stderr] 
[INFO] [stderr] error: aborting due to 6 previous errors
[INFO] [stderr] 
[INFO] [stderr] Some errors have detailed explanations: E0554, E0599.
[INFO] [stderr] For more information about an error, try `rustc --explain E0554`.
[INFO] [stderr] error: could not compile `asexp`.
[INFO] [stderr] 
[INFO] [stderr] To learn more, run the command again with --verbose.
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[INFO] [stderr] error: build failed
[INFO] running `"docker" "inspect" "ef28ec147cc2d8f096af0f49062b35fa3931d0eff47a28ae8f8daa00ce16951f"`
[INFO] running `"docker" "rm" "-f" "ef28ec147cc2d8f096af0f49062b35fa3931d0eff47a28ae8f8daa00ce16951f"`
[INFO] [stdout] ef28ec147cc2d8f096af0f49062b35fa3931d0eff47a28ae8f8daa00ce16951f