[INFO] cloning repository https://github.com/jawadcode/parser_tutorial
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/jawadcode/parser_tutorial" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fjawadcode%2Fparser_tutorial", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fjawadcode%2Fparser_tutorial'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] c4a352753a461770fccb7456e4c5c63d4abcd2ae
[INFO] checking jawadcode/parser_tutorial against master#ceab6128fa48a616bfd3e3adf4bc80133b8ee223 for no-never-type-fallback
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fjawadcode%2Fparser_tutorial" "/workspace/builds/worker-2-tc1/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-2-tc1/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/jawadcode/parser_tutorial on toolchain ceab6128fa48a616bfd3e3adf4bc80133b8ee223
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+ceab6128fa48a616bfd3e3adf4bc80133b8ee223" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/jawadcode/parser_tutorial
[INFO] finished tweaking git repo https://github.com/jawadcode/parser_tutorial
[INFO] tweaked toml for git repo https://github.com/jawadcode/parser_tutorial written to /workspace/builds/worker-2-tc1/source/Cargo.toml
[INFO] crate git repo https://github.com/jawadcode/parser_tutorial 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" "+ceab6128fa48a616bfd3e3adf4bc80133b8ee223" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]  Downloading crates ...
[INFO] [stderr]   Downloaded lexical-parse-integer v0.8.3
[INFO] [stderr]   Downloaded lexical v6.1.0
[INFO] [stderr]   Downloaded lexical-util v0.8.3
[INFO] [stderr]   Downloaded lexical-core v0.8.3
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[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-2-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-2-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@sha256:2788e3201cd34a07e3172128adcd8b3090168a8e3bcc40d7c032b9dda1df7d1c" "/opt/rustwide/cargo-home/bin/cargo" "+ceab6128fa48a616bfd3e3adf4bc80133b8ee223" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 0723de2ad150a5e395d9539a022d7967b7cbb995cd465b3b5875cf84f9f0d41d
[INFO] running `Command { std: "docker" "start" "-a" "0723de2ad150a5e395d9539a022d7967b7cbb995cd465b3b5875cf84f9f0d41d", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "0723de2ad150a5e395d9539a022d7967b7cbb995cd465b3b5875cf84f9f0d41d", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "0723de2ad150a5e395d9539a022d7967b7cbb995cd465b3b5875cf84f9f0d41d", kill_on_drop: false }`
[INFO] [stdout] 0723de2ad150a5e395d9539a022d7967b7cbb995cd465b3b5875cf84f9f0d41d
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-2-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-2-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@sha256:2788e3201cd34a07e3172128adcd8b3090168a8e3bcc40d7c032b9dda1df7d1c" "/opt/rustwide/cargo-home/bin/cargo" "+ceab6128fa48a616bfd3e3adf4bc80133b8ee223" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] dc8f8518736604ad7f0db2e857ed54a340ac1c57a36d041f8b02c9ec6a85fa6b
[INFO] running `Command { std: "docker" "start" "-a" "dc8f8518736604ad7f0db2e857ed54a340ac1c57a36d041f8b02c9ec6a85fa6b", kill_on_drop: false }`
[INFO] [stderr]    Compiling syn v1.0.86
[INFO] [stderr]    Compiling regex-syntax v0.6.25
[INFO] [stderr]    Compiling utf8-ranges v1.0.4
[INFO] [stderr]    Compiling beef v0.5.1
[INFO] [stderr]     Checking lexical-util v0.8.3
[INFO] [stderr]    Compiling quote v1.0.15
[INFO] [stderr]     Checking lexical-parse-integer v0.8.3
[INFO] [stderr]     Checking lexical-write-integer v0.8.3
[INFO] [stderr]     Checking lexical-parse-float v0.8.3
[INFO] [stderr]     Checking lexical-write-float v0.8.3
[INFO] [stderr]     Checking lexical-core v0.8.3
[INFO] [stderr]     Checking lexical v6.1.0
[INFO] [stderr]    Compiling logos-derive v0.12.0
[INFO] [stderr]    Compiling derive_more v0.99.17
[INFO] [stderr]     Checking logos v0.12.0
[INFO] [stderr]     Checking parser_tutorial v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: method `prefix_binding_power` is never used
[INFO] [stdout]   --> src/parser.rs:27:8
[INFO] [stdout]    |
[INFO] [stdout] 26 | trait Operator {
[INFO] [stdout]    |       -------- method in this trait
[INFO] [stdout] 27 |     fn prefix_binding_power(&self) -> Option<((), u8)>;
[INFO] [stdout]    |        ^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: method `prefix_binding_power` is never used
[INFO] [stdout]   --> src/parser.rs:27:8
[INFO] [stdout]    |
[INFO] [stdout] 26 | trait Operator {
[INFO] [stdout]    |       -------- method in this trait
[INFO] [stdout] 27 |     fn prefix_binding_power(&self) -> Option<((), u8)>;
[INFO] [stdout]    |        ^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 1 warning emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 1 warning emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished `dev` profile [unoptimized + debuginfo] target(s) in 4.02s
[INFO] running `Command { std: "docker" "inspect" "dc8f8518736604ad7f0db2e857ed54a340ac1c57a36d041f8b02c9ec6a85fa6b", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "dc8f8518736604ad7f0db2e857ed54a340ac1c57a36d041f8b02c9ec6a85fa6b", kill_on_drop: false }`
[INFO] [stdout] dc8f8518736604ad7f0db2e857ed54a340ac1c57a36d041f8b02c9ec6a85fa6b