[INFO] cloning repository https://github.com/journeyman32/echor
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/journeyman32/echor" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fjourneyman32%2Fechor", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fjourneyman32%2Fechor'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 39e9c913c524177002669da2b91be7ff12c9a675
[INFO] testing journeyman32/echor against 1.99.0-beta.1+cargoflags=--release for beta-release-1.99-2
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fjourneyman32%2Fechor" "/workspace/builds/worker-6-tc2/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-6-tc2/source'...
[INFO] [stderr] done.
[INFO] started tweaking git repo https://github.com/journeyman32/echor
[INFO] finished tweaking git repo https://github.com/journeyman32/echor
[INFO] tweaked toml for git repo https://github.com/journeyman32/echor written to /workspace/builds/worker-6-tc2/source/Cargo.toml
[INFO] validating manifest of git repo https://github.com/journeyman32/echor on toolchain 1.99.0-beta.1
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+1.99.0-beta.1" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] crate git repo https://github.com/journeyman32/echor 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" "+1.99.0-beta.1" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-6-tc2/source:/opt/rustwide/workdir:ro,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-6-tc2/target:/opt/rustwide/target:rw,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" "-m" "1610612736" "--network" "none" "ghcr.io/rust-lang/crates-build-env/linux@sha256:8683fc1fc2eb5c9ac98e0d076ab094b2ffac7f99da555d2b6a2e27f346de2ec7" "sleep" "infinity", kill_on_drop: false }`
[INFO] [stdout] 61658a994c1e114001d75d51d32790022e66d9ff5ad5b072a3a5d59a83adfc33
[INFO] running `Command { std: "docker" "start" "61658a994c1e114001d75d51d32790022e66d9ff5ad5b072a3a5d59a83adfc33", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "61658a994c1e114001d75d51d32790022e66d9ff5ad5b072a3a5d59a83adfc33", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "exec" "-e" "SOURCE_DIR=/opt/rustwide/workdir" "-e" "CARGO_HOME=/opt/rustwide/cargo-home" "-e" "RUSTUP_HOME=/opt/rustwide/rustup-home" "-e" "CARGO_TARGET_DIR=/opt/rustwide/target" "-w" "/opt/rustwide/workdir" "--user" "0:0" "61658a994c1e114001d75d51d32790022e66d9ff5ad5b072a3a5d59a83adfc33" "/opt/rustwide/cargo-home/bin/cargo" "+1.99.0-beta.1" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "61658a994c1e114001d75d51d32790022e66d9ff5ad5b072a3a5d59a83adfc33", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "exec" "-e" "SOURCE_DIR=/opt/rustwide/workdir" "-e" "CARGO_HOME=/opt/rustwide/cargo-home" "-e" "RUSTUP_HOME=/opt/rustwide/rustup-home" "-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" "-w" "/opt/rustwide/workdir" "--user" "0:0" "61658a994c1e114001d75d51d32790022e66d9ff5ad5b072a3a5d59a83adfc33" "/opt/rustwide/cargo-home/bin/cargo" "+1.99.0-beta.1" "build" "--frozen" "--message-format=json" "--release", kill_on_drop: false }`
[INFO] [stderr]    Compiling libc v0.2.148
[INFO] [stderr]    Compiling unicode-width v0.1.10
[INFO] [stderr]    Compiling ansi_term v0.12.1
[INFO] [stderr]    Compiling vec_map v0.8.2
[INFO] [stderr]    Compiling strsim v0.8.0
[INFO] [stderr]    Compiling textwrap v0.11.0
[INFO] [stderr]    Compiling atty v0.2.14
[INFO] [stderr]    Compiling clap v2.34.0
[INFO] [stderr]    Compiling echor v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] error[E0599]: no method named `join` found for enum `Cow<'_, str>` in the current scope
[INFO] [stdout]   --> src/main.rs:24:25
[INFO] [stdout]    |
[INFO] [stdout] 24 |     print!("{}{}", text.join(" "), if omit_newline { "" } else { "\n" });
[INFO] [stdout]    |                         ^^^^ method not found in `Cow<'_, str>`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] For more information about this error, try `rustc --explain E0599`.
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `echor` (bin "echor") due to 1 previous error
[INFO] running `Command { std: "docker" "inspect" "61658a994c1e114001d75d51d32790022e66d9ff5ad5b072a3a5d59a83adfc33", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "61658a994c1e114001d75d51d32790022e66d9ff5ad5b072a3a5d59a83adfc33", kill_on_drop: false }`
[INFO] [stdout] 61658a994c1e114001d75d51d32790022e66d9ff5ad5b072a3a5d59a83adfc33
