[INFO] fetching crate mers_lib 0.9.29...
[INFO] testing mers_lib-0.9.29 against try#dec9417b8611e34e787a3e4c37686b5131f9e5c5 for pr-154210-1
[INFO] extracting crate mers_lib 0.9.29 into /workspace/builds/worker-1-tc2/source
[INFO] started tweaking crates.io crate mers_lib 0.9.29
[INFO] removed 0 missing examples
[INFO] removed 0 missing tests
[INFO] finished tweaking crates.io crate mers_lib 0.9.29
[INFO] tweaked toml for crates.io crate mers_lib 0.9.29 written to /workspace/builds/worker-1-tc2/source/Cargo.toml
[INFO] validating manifest of crates.io crate mers_lib 0.9.29 on toolchain dec9417b8611e34e787a3e4c37686b5131f9e5c5
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+dec9417b8611e34e787a3e4c37686b5131f9e5c5" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] crate crates.io crate mers_lib 0.9.29 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" "+dec9417b8611e34e787a3e4c37686b5131f9e5c5" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-1-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-1-tc2/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" "+dec9417b8611e34e787a3e4c37686b5131f9e5c5" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 464b00743dfd19b6fd26fd7cb4ee0c556db31297484c1ccedc5f91dfa060c69c
[INFO] running `Command { std: "docker" "start" "-a" "464b00743dfd19b6fd26fd7cb4ee0c556db31297484c1ccedc5f91dfa060c69c", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "464b00743dfd19b6fd26fd7cb4ee0c556db31297484c1ccedc5f91dfa060c69c", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "464b00743dfd19b6fd26fd7cb4ee0c556db31297484c1ccedc5f91dfa060c69c", kill_on_drop: false }`
[INFO] [stdout] 464b00743dfd19b6fd26fd7cb4ee0c556db31297484c1ccedc5f91dfa060c69c
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-1-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-1-tc2/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" "+dec9417b8611e34e787a3e4c37686b5131f9e5c5" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] d9cdf3877fd9a2cbd41aa76216bb967701a48d0ff5d82154d3ba59c5245ef587
[INFO] running `Command { std: "docker" "start" "-a" "d9cdf3877fd9a2cbd41aa76216bb967701a48d0ff5d82154d3ba59c5245ef587", kill_on_drop: false }`
[INFO] [stderr]    Compiling line-span v0.1.5
[INFO] [stderr]    Compiling mers_lib v0.9.29 (/opt/rustwide/workdir)
[INFO] [stdout] warning: value assigned to `comp` is never read
[INFO] [stdout]   --> src/program/parsed/init_to.rs:29:9
[INFO] [stdout]    |
[INFO] [stdout] 29 |         comp.is_init = false;
[INFO] [stdout]    |         ^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = help: maybe it is overwritten before being read?
[INFO] [stdout]    = note: `#[warn(unused_assignments)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished `dev` profile [unoptimized + debuginfo] target(s) in 6.97s
[INFO] running `Command { std: "docker" "inspect" "d9cdf3877fd9a2cbd41aa76216bb967701a48d0ff5d82154d3ba59c5245ef587", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "d9cdf3877fd9a2cbd41aa76216bb967701a48d0ff5d82154d3ba59c5245ef587", kill_on_drop: false }`
[INFO] [stdout] d9cdf3877fd9a2cbd41aa76216bb967701a48d0ff5d82154d3ba59c5245ef587
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-1-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-1-tc2/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" "+dec9417b8611e34e787a3e4c37686b5131f9e5c5" "test" "--frozen" "--no-run" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 93b8f298495b9744e92a5e03fcfb52a18f85f22ef10f58af1d6e233c06e9bc9c
[INFO] running `Command { std: "docker" "start" "-a" "93b8f298495b9744e92a5e03fcfb52a18f85f22ef10f58af1d6e233c06e9bc9c", kill_on_drop: false }`
[INFO] [stdout] warning: value assigned to `comp` is never read
[INFO] [stdout]   --> src/program/parsed/init_to.rs:29:9
[INFO] [stdout]    |
[INFO] [stdout] 29 |         comp.is_init = false;
[INFO] [stdout]    |         ^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = help: maybe it is overwritten before being read?
[INFO] [stdout]    = note: `#[warn(unused_assignments)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]    Compiling mers_lib v0.9.29 (/opt/rustwide/workdir)
[INFO] [stdout] warning: value assigned to `comp` is never read
[INFO] [stdout]   --> src/program/parsed/init_to.rs:29:9
[INFO] [stdout]    |
[INFO] [stdout] 29 |         comp.is_init = false;
[INFO] [stdout]    |         ^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = help: maybe it is overwritten before being read?
[INFO] [stdout]    = note: `#[warn(unused_assignments)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished `test` profile [unoptimized + debuginfo] target(s) in 2.61s
[INFO] running `Command { std: "docker" "inspect" "93b8f298495b9744e92a5e03fcfb52a18f85f22ef10f58af1d6e233c06e9bc9c", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "93b8f298495b9744e92a5e03fcfb52a18f85f22ef10f58af1d6e233c06e9bc9c", kill_on_drop: false }`
[INFO] [stdout] 93b8f298495b9744e92a5e03fcfb52a18f85f22ef10f58af1d6e233c06e9bc9c
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-1-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-1-tc2/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" "+dec9417b8611e34e787a3e4c37686b5131f9e5c5" "test" "--frozen", kill_on_drop: false }`
[INFO] [stdout] 86bff1d59322916bd15583f771c32d8032bb69ed64fb5404e0b6333d1643a5ed
[INFO] running `Command { std: "docker" "start" "-a" "86bff1d59322916bd15583f771c32d8032bb69ed64fb5404e0b6333d1643a5ed", kill_on_drop: false }`
[INFO] [stderr] warning: value assigned to `comp` is never read
[INFO] [stderr]   --> src/program/parsed/init_to.rs:29:9
[INFO] [stderr]    |
[INFO] [stderr] 29 |         comp.is_init = false;
[INFO] [stderr]    |         ^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = help: maybe it is overwritten before being read?
[INFO] [stderr]    = note: `#[warn(unused_assignments)]` (part of `#[warn(unused)]`) on by default
[INFO] [stderr] 
[INFO] [stderr] warning: `mers_lib` (lib) generated 1 warning
[INFO] [stderr] warning: `mers_lib` (lib test) generated 1 warning (1 duplicate)
[INFO] [stderr]     Finished `test` profile [unoptimized + debuginfo] target(s) in 0.05s
[INFO] [stderr]      Running unittests src/lib.rs (/opt/rustwide/target/debug/deps/mers_lib-507d5f4cc686ca17)
[INFO] [stderr]      Running tests/lang.rs (/opt/rustwide/target/debug/deps/lang-24fa802330832476)
[INFO] [stdout] 
[INFO] [stdout] running 0 tests
[INFO] [stdout] 
[INFO] [stdout] test result: ok. 0 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 0.00s
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] running 4 tests
[INFO] [stdout] test identity_function ... ok
[INFO] [stdout] test mutating_a_variable ... ok
[INFO] [stdout] test variable_shadowing ... ok
[INFO] [stdout] test variable ... ok
[INFO] [stderr]    Doc-tests mers_lib
[INFO] [stdout] 
[INFO] [stdout] test result: ok. 4 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 0.03s
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] running 0 tests
[INFO] [stdout] 
[INFO] [stdout] test result: ok. 0 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 0.00s
[INFO] [stdout] 
[INFO] running `Command { std: "docker" "inspect" "86bff1d59322916bd15583f771c32d8032bb69ed64fb5404e0b6333d1643a5ed", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "86bff1d59322916bd15583f771c32d8032bb69ed64fb5404e0b6333d1643a5ed", kill_on_drop: false }`
[INFO] [stdout] 86bff1d59322916bd15583f771c32d8032bb69ed64fb5404e0b6333d1643a5ed