[INFO] cloning repository https://github.com/BlueGhostGH/json
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/BlueGhostGH/json" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FBlueGhostGH%2Fjson", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FBlueGhostGH%2Fjson'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] eb65d152b10e239c84d115c9967b6523f2ba7662
[INFO] building BlueGhostGH/json against master#11663cd3bfefef7d34e8f0892c250bf698049392+rustflags=-Dtail-expr-drop-order for pr-134523
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FBlueGhostGH%2Fjson" "/workspace/builds/worker-7-tc1/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-7-tc1/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/BlueGhostGH/json on toolchain 11663cd3bfefef7d34e8f0892c250bf698049392
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+11663cd3bfefef7d34e8f0892c250bf698049392" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/BlueGhostGH/json
[INFO] finished tweaking git repo https://github.com/BlueGhostGH/json
[INFO] tweaked toml for git repo https://github.com/BlueGhostGH/json written to /workspace/builds/worker-7-tc1/source/Cargo.toml
[INFO] crate git repo https://github.com/BlueGhostGH/json 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" "+11663cd3bfefef7d34e8f0892c250bf698049392" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-7-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-7-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:f3a9d4ad9d972b27faf3965f35b62e55ba32bbce8f20bc8fe909558a86702fde" "/opt/rustwide/cargo-home/bin/cargo" "+11663cd3bfefef7d34e8f0892c250bf698049392" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] dff3ff0ecfe8089650e8fb1c0f017bf451519b4d9f60446136a32a368e8fbdee
[INFO] running `Command { std: "docker" "start" "-a" "dff3ff0ecfe8089650e8fb1c0f017bf451519b4d9f60446136a32a368e8fbdee", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "dff3ff0ecfe8089650e8fb1c0f017bf451519b4d9f60446136a32a368e8fbdee", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "dff3ff0ecfe8089650e8fb1c0f017bf451519b4d9f60446136a32a368e8fbdee", kill_on_drop: false }`
[INFO] [stdout] dff3ff0ecfe8089650e8fb1c0f017bf451519b4d9f60446136a32a368e8fbdee
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-7-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-7-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 -Dtail-expr-drop-order" "-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:f3a9d4ad9d972b27faf3965f35b62e55ba32bbce8f20bc8fe909558a86702fde" "/opt/rustwide/cargo-home/bin/cargo" "+11663cd3bfefef7d34e8f0892c250bf698049392" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 26fdf1afcaa89716630abcbc7f8a085d500c49967d22b5fcdaf28bdc89c8d8f4
[INFO] running `Command { std: "docker" "start" "-a" "26fdf1afcaa89716630abcbc7f8a085d500c49967d22b5fcdaf28bdc89c8d8f4", kill_on_drop: false }`
[INFO] [stderr]    Compiling json v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: the feature `const_io_structs` has been stable since 1.79.0 and no longer requires an attribute to enable
[INFO] [stdout]  --> src/lib.rs:2:30
[INFO] [stdout]   |
[INFO] [stdout] 2 | #![feature(read_initializer, const_io_structs, trusted_len)]
[INFO] [stdout]   |                              ^^^^^^^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(stable_features)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0635]: unknown feature `read_initializer`
[INFO] [stdout]  --> src/lib.rs:2:12
[INFO] [stdout]   |
[INFO] [stdout] 2 | #![feature(read_initializer, const_io_structs, trusted_len)]
[INFO] [stdout]   |            ^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0599]: no method named `initializer` found for type parameter `R` in the current scope
[INFO] [stdout]   --> src/input_reader/buffered_reader.rs:76:19
[INFO] [stdout]    |
[INFO] [stdout] 46 | impl<R: io::Read> BufferedReader<R> {
[INFO] [stdout]    |      - method `initializer` not found for this type parameter
[INFO] [stdout] ...
[INFO] [stdout] 76 |             inner.initializer().initialize(&mut buffer);
[INFO] [stdout]    |                   ^^^^^^^^^^^ method not found in `R`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] Some errors have detailed explanations: E0599, E0635.
[INFO] [stdout] 
[INFO] [stdout] For more information about an error, try `rustc --explain E0599`.
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `json` (lib) due to 2 previous errors; 1 warning emitted
[INFO] running `Command { std: "docker" "inspect" "26fdf1afcaa89716630abcbc7f8a085d500c49967d22b5fcdaf28bdc89c8d8f4", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "26fdf1afcaa89716630abcbc7f8a085d500c49967d22b5fcdaf28bdc89c8d8f4", kill_on_drop: false }`
[INFO] [stdout] 26fdf1afcaa89716630abcbc7f8a085d500c49967d22b5fcdaf28bdc89c8d8f4