[INFO] cloning repository https://github.com/danieljharris/dev_playground_rust
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/danieljharris/dev_playground_rust" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fdanieljharris%2Fdev_playground_rust", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fdanieljharris%2Fdev_playground_rust'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 69a72543f346e4ef90b9bdcc5f599f2ff77737c5
[INFO] checking danieljharris/dev_playground_rust against 1.95.0 for pr-155915
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fdanieljharris%2Fdev_playground_rust" "/workspace/builds/worker-0-tc1/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-0-tc1/source'...
[INFO] [stderr] done.
[INFO] started tweaking git repo https://github.com/danieljharris/dev_playground_rust
[INFO] finished tweaking git repo https://github.com/danieljharris/dev_playground_rust
[INFO] tweaked toml for git repo https://github.com/danieljharris/dev_playground_rust written to /workspace/builds/worker-0-tc1/source/Cargo.toml
[INFO] validating manifest of git repo https://github.com/danieljharris/dev_playground_rust on toolchain 1.95.0
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+1.95.0" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] crate git repo https://github.com/danieljharris/dev_playground_rust already has a lockfile, it will not be regenerated
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+1.95.0" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Updating crates.io index
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]  Downloading crates ...
[INFO] [stderr]   Downloaded traitobject v0.1.1
[INFO] [stderr]   Downloaded websocket-base v0.26.5
[INFO] [stderr]   Downloaded websocket v0.27.1
[INFO] [stderr]   Downloaded proc-macro2 v1.0.102
[INFO] [stderr]   Downloaded cc v1.2.41
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-0-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-0-tc1/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" "CARGO_TARGET_DIR=/opt/rustwide/target" "-e" "CARGO_HOME=/opt/rustwide/cargo-home" "-e" "RUSTUP_HOME=/opt/rustwide/rustup-home" "-w" "/opt/rustwide/workdir" "-m" "1610612736" "--user" "0:0" "--network" "none" "ghcr.io/rust-lang/crates-build-env/linux@sha256:d429b63d4308055ea97f60fb1d3dfca48854a00942f1bd2ad806beaf015945ec" "/opt/rustwide/cargo-home/bin/cargo" "+1.95.0" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 3c92eaa9c4dad7faa8edcad73a6426a8a0cd3990018d2ed07076a6f5c2aa4b3d
[INFO] running `Command { std: "docker" "start" "-a" "3c92eaa9c4dad7faa8edcad73a6426a8a0cd3990018d2ed07076a6f5c2aa4b3d", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "3c92eaa9c4dad7faa8edcad73a6426a8a0cd3990018d2ed07076a6f5c2aa4b3d", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "3c92eaa9c4dad7faa8edcad73a6426a8a0cd3990018d2ed07076a6f5c2aa4b3d", kill_on_drop: false }`
[INFO] [stdout] 3c92eaa9c4dad7faa8edcad73a6426a8a0cd3990018d2ed07076a6f5c2aa4b3d
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-0-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-0-tc1/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" "CARGO_TARGET_DIR=/opt/rustwide/target" "-e" "CARGO_INCREMENTAL=0" "-e" "RUST_BACKTRACE=full" "-e" "RUSTFLAGS=--cap-lints=forbid" "-e" "RUSTDOCFLAGS=--cap-lints=forbid" "-e" "CARGO_HOME=/opt/rustwide/cargo-home" "-e" "RUSTUP_HOME=/opt/rustwide/rustup-home" "-w" "/opt/rustwide/workdir" "-m" "1610612736" "--user" "0:0" "--network" "none" "ghcr.io/rust-lang/crates-build-env/linux@sha256:d429b63d4308055ea97f60fb1d3dfca48854a00942f1bd2ad806beaf015945ec" "/opt/rustwide/cargo-home/bin/cargo" "+1.95.0" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 92003d0a5b1bacb613f98cc8c525c84ebb980f294ed7dc49e2af9e9d662ba439
[INFO] running `Command { std: "docker" "start" "-a" "92003d0a5b1bacb613f98cc8c525c84ebb980f294ed7dc49e2af9e9d662ba439", kill_on_drop: false }`
[INFO] [stderr]     Checking log v0.4.28
[INFO] [stderr]    Compiling find-msvc-tools v0.1.4
[INFO] [stderr]    Compiling proc-macro2 v1.0.102
[INFO] [stderr]     Checking iovec v0.1.4
[INFO] [stderr]    Compiling unicode-ident v1.0.20
[INFO] [stderr]    Compiling quote v1.0.41
[INFO] [stderr]    Compiling maybe-uninit v2.0.0
[INFO] [stderr]    Compiling crossbeam-utils v0.7.2
[INFO] [stderr]    Compiling openssl v0.10.74
[INFO] [stderr]    Compiling parking_lot_core v0.6.3
[INFO] [stderr]    Compiling parking_lot v0.9.0
[INFO] [stderr]     Checking lock_api v0.3.4
[INFO] [stderr]     Checking net2 v0.2.39
[INFO] [stderr]     Checking generic-array v0.12.4
[INFO] [stderr]     Checking num_cpus v1.17.0
[INFO] [stderr]    Compiling version_check v0.1.5
[INFO] [stderr]     Checking slab v0.4.11
[INFO] [stderr]     Checking bytes v0.4.12
[INFO] [stderr]     Checking tokio-sync v0.1.8
[INFO] [stderr]     Checking unicode-normalization v0.1.24
[INFO] [stderr]     Checking matches v0.1.10
[INFO] [stderr]    Compiling cc v1.2.41
[INFO] [stderr]     Checking log v0.3.9
[INFO] [stderr]     Checking rand_hc v0.1.0
[INFO] [stderr]     Checking rand_xorshift v0.1.1
[INFO] [stderr]     Checking digest v0.8.1
[INFO] [stderr]     Checking block-buffer v0.7.3
[INFO] [stderr]     Checking smallvec v0.6.14
[INFO] [stderr]     Checking rand_isaac v0.1.1
[INFO] [stderr]     Checking rand_jitter v0.1.4
[INFO] [stderr]     Checking mio v0.6.23
[INFO] [stderr]     Checking rand_os v0.1.3
[INFO] [stderr]    Compiling unicase v1.4.2
[INFO] [stderr]    Compiling serde_core v1.0.228
[INFO] [stderr]     Checking safemem v0.3.3
[INFO] [stderr]     Checking sha-1 v0.8.2
[INFO] [stderr]     Checking mime v0.2.6
[INFO] [stderr]     Checking tokio-io v0.1.13
[INFO] [stderr]     Checking base64 v0.10.1
[INFO] [stderr]     Checking time v0.1.45
[INFO] [stderr]     Checking typeable v0.1.2
[INFO] [stderr]     Checking base64 v0.9.3
[INFO] [stderr]     Checking language-tags v0.2.2
[INFO] [stderr]    Compiling serde_json v1.0.145
[INFO] [stderr]     Checking rand v0.6.5
[INFO] [stderr]     Checking traitobject v0.1.1
[INFO] [stderr]     Checking ryu v1.0.20
[INFO] [stderr]     Checking itoa v1.0.15
[INFO] [stderr]     Checking tokio-executor v0.1.10
[INFO] [stderr]     Checking memchr v2.7.6
[INFO] [stderr]     Checking idna v0.1.5
[INFO] [stderr]     Checking tokio-reactor v0.1.12
[INFO] [stderr]     Checking tokio-codec v0.1.2
[INFO] [stderr]    Compiling syn v2.0.108
[INFO] [stderr]     Checking tokio-tcp v0.1.4
[INFO] [stderr]     Checking url v1.7.2
[INFO] [stderr]    Compiling openssl-sys v0.9.110
[INFO] [stderr]     Checking hyper v0.10.16
[INFO] [stderr]    Compiling native-tls v0.2.14
[INFO] [stderr]    Compiling openssl-macros v0.1.1
[INFO] [stderr]     Checking tokio-tls v0.2.1
[INFO] [stderr]     Checking websocket-base v0.26.5
[INFO] [stderr]     Checking websocket v0.27.1
[INFO] [stderr]     Checking dev_playground_rust v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the stable release channel
[INFO] [stdout]  --> src/main.rs:1:1
[INFO] [stdout]   |
[INFO] [stdout] 1 | #![feature(explicit_tail_calls)]
[INFO] [stdout]   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] For more information about this error, try `rustc --explain E0554`.
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `dev_playground_rust` (bin "dev_playground_rust" test) due to 1 previous error
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the stable release channel
[INFO] [stdout]  --> src/main.rs:1:1
[INFO] [stdout]   |
[INFO] [stdout] 1 | #![feature(explicit_tail_calls)]
[INFO] [stdout]   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] For more information about this error, try `rustc --explain E0554`.
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `dev_playground_rust` (bin "dev_playground_rust") due to 1 previous error
[INFO] running `Command { std: "docker" "inspect" "92003d0a5b1bacb613f98cc8c525c84ebb980f294ed7dc49e2af9e9d662ba439", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "92003d0a5b1bacb613f98cc8c525c84ebb980f294ed7dc49e2af9e9d662ba439", kill_on_drop: false }`
[INFO] [stdout] 92003d0a5b1bacb613f98cc8c525c84ebb980f294ed7dc49e2af9e9d662ba439
