[INFO] fetching crate ctor-used-linker 0.2.0...
[INFO] testing ctor-used-linker-0.2.0 against 1.90.0 for beta-1.91-3
[INFO] extracting crate ctor-used-linker 0.2.0 into /workspace/builds/worker-4-tc1/source
[INFO] started tweaking crates.io crate ctor-used-linker 0.2.0
[INFO] removed 0 missing examples
[INFO] finished tweaking crates.io crate ctor-used-linker 0.2.0
[INFO] tweaked toml for crates.io crate ctor-used-linker 0.2.0 written to /workspace/builds/worker-4-tc1/source/Cargo.toml
[INFO] validating manifest of crates.io crate ctor-used-linker 0.2.0 on toolchain 1.90.0
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+1.90.0" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] crate crates.io crate ctor-used-linker 0.2.0 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" "+1.90.0" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Updating crates.io index
[INFO] [stderr]  Downloading crates ...
[INFO] [stderr]   Downloaded libc-print v0.1.21
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-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:e90291280db7d1fac5b66fc6dad9f9662629e7365a55743daf9bdf73ebc4ea79" "/opt/rustwide/cargo-home/bin/cargo" "+1.90.0" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 7429029d0f3051e3d33c5634e419ba73518d2fe35868380697451163cdf984e8
[INFO] running `Command { std: "docker" "start" "-a" "7429029d0f3051e3d33c5634e419ba73518d2fe35868380697451163cdf984e8", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "7429029d0f3051e3d33c5634e419ba73518d2fe35868380697451163cdf984e8", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "7429029d0f3051e3d33c5634e419ba73518d2fe35868380697451163cdf984e8", kill_on_drop: false }`
[INFO] [stdout] 7429029d0f3051e3d33c5634e419ba73518d2fe35868380697451163cdf984e8
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-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=warn" "-e" "RUSTDOCFLAGS=--cap-lints=warn" "-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:e90291280db7d1fac5b66fc6dad9f9662629e7365a55743daf9bdf73ebc4ea79" "/opt/rustwide/cargo-home/bin/cargo" "+1.90.0" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 744c5e836c350a5116812a060502586bc4455e77a1dfa6b7deb757ef403ffedf
[INFO] running `Command { std: "docker" "start" "-a" "744c5e836c350a5116812a060502586bc4455e77a1dfa6b7deb757ef403ffedf", kill_on_drop: false }`
[INFO] [stderr]    Compiling proc-macro2 v1.0.57
[INFO] [stderr]    Compiling quote v1.0.27
[INFO] [stderr]    Compiling syn v2.0.16
[INFO] [stderr]    Compiling ctor-used-linker v0.2.0 (/opt/rustwide/workdir)
[INFO] [stderr]     Finished `dev` profile [unoptimized + debuginfo] target(s) in 4.49s
[INFO] running `Command { std: "docker" "inspect" "744c5e836c350a5116812a060502586bc4455e77a1dfa6b7deb757ef403ffedf", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "744c5e836c350a5116812a060502586bc4455e77a1dfa6b7deb757ef403ffedf", kill_on_drop: false }`
[INFO] [stdout] 744c5e836c350a5116812a060502586bc4455e77a1dfa6b7deb757ef403ffedf
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-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=warn" "-e" "RUSTDOCFLAGS=--cap-lints=warn" "-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:e90291280db7d1fac5b66fc6dad9f9662629e7365a55743daf9bdf73ebc4ea79" "/opt/rustwide/cargo-home/bin/cargo" "+1.90.0" "test" "--frozen" "--no-run" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 090bfef05b98f73fc240d7a31973a5b0fd3644bb4bdb4e68552d2f74f98fd89c
[INFO] running `Command { std: "docker" "start" "-a" "090bfef05b98f73fc240d7a31973a5b0fd3644bb4bdb4e68552d2f74f98fd89c", kill_on_drop: false }`
[INFO] [stderr]    Compiling proc-macro2 v1.0.57
[INFO] [stderr]    Compiling unicode-ident v1.0.8
[INFO] [stderr]    Compiling libc v0.2.144
[INFO] [stderr]    Compiling quote v1.0.27
[INFO] [stderr]    Compiling syn v2.0.16
[INFO] [stderr]    Compiling libc-print v0.1.21
[INFO] [stderr]    Compiling ctor-used-linker v0.2.0 (/opt/rustwide/workdir)
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the stable release channel
[INFO] [stdout]  --> src/example.rs:1:1
[INFO] [stdout]   |
[INFO] [stdout] 1 | #![feature(used_with_arg)]
[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 `ctor-used-linker` (example "example") due to 1 previous error
[INFO] running `Command { std: "docker" "inspect" "090bfef05b98f73fc240d7a31973a5b0fd3644bb4bdb4e68552d2f74f98fd89c", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "090bfef05b98f73fc240d7a31973a5b0fd3644bb4bdb4e68552d2f74f98fd89c", kill_on_drop: false }`
[INFO] [stdout] 090bfef05b98f73fc240d7a31973a5b0fd3644bb4bdb4e68552d2f74f98fd89c