[INFO] crate symbolics_calculus 0.1.5 is already in cache
[INFO] testing symbolics_calculus-0.1.5 against 1.44.0 for beta-1.45-1
[INFO] extracting crate symbolics_calculus 0.1.5 into /workspace/builds/worker-1/source
[INFO] validating manifest of crates.io crate symbolics_calculus 0.1.5 on toolchain 1.44.0
[INFO] running `"/workspace/cargo-home/bin/cargo" "+1.44.0" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] started tweaking crates.io crate symbolics_calculus 0.1.5
[INFO] finished tweaking crates.io crate symbolics_calculus 0.1.5
[INFO] tweaked toml for crates.io crate symbolics_calculus 0.1.5 written to /workspace/builds/worker-1/source/Cargo.toml
[INFO] running `"/workspace/cargo-home/bin/cargo" "+1.44.0" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update"`
[INFO] running `"/workspace/cargo-home/bin/cargo" "+1.44.0" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] running `"docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-1/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" "MAP_USER_ID=0" "-e" "CARGO_TARGET_DIR=/opt/rustwide/target" "-e" "CARGO_INCREMENTAL=0" "-e" "RUST_BACKTRACE=full" "-e" "RUSTFLAGS=--cap-lints=warn" "-e" "CARGO_HOME=/opt/rustwide/cargo-home" "-e" "RUSTUP_HOME=/opt/rustwide/rustup-home" "-w" "/opt/rustwide/workdir" "-m" "1610612736" "--network" "none" "rustops/crates-build-env" "/opt/rustwide/cargo-home/bin/cargo" "+1.44.0" "build" "--frozen"`
[INFO] [stdout] a3bd2975f437ccaf49416dd550faf12ac5b12233e3fc8e656fa5a8184d4baa21
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] running `"docker" "start" "-a" "a3bd2975f437ccaf49416dd550faf12ac5b12233e3fc8e656fa5a8184d4baa21"`
[INFO] [stderr] sudo: setrlimit(RLIMIT_CORE): Operation not permitted
[INFO] [stderr]    Compiling symbolics_core v0.1.5
[INFO] [stderr]    Compiling symbolics_calculus v0.1.5 (/opt/rustwide/workdir)
[INFO] [stderr] warning: unused imports: `apply`, `s`
[INFO] [stderr]  --> src/lib.rs:3:22
[INFO] [stderr]   |
[INFO] [stderr] 3 | use symbolics_core::{s, apply};
[INFO] [stderr]   |                      ^  ^^^^^
[INFO] [stderr]   |
[INFO] [stderr]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stderr] 
[INFO] [stderr] error[E0283]: type annotations needed for `std::string::String`
[INFO] [stderr]   --> src/lib.rs:16:47
[INFO] [stderr]    |
[INFO] [stderr] 12 |         let wrt = wrt_raw.into();
[INFO] [stderr]    |             --- consider giving `wrt` a type
[INFO] [stderr] ...
[INFO] [stderr] 16 |             Add(a, b) => a.clone().deriv1(wrt.as_ref()) + b.clone().deriv1(wrt.as_ref()),
[INFO] [stderr]    |                                               ^^^^^^ cannot infer type for struct `std::string::String`
[INFO] [stderr]    |
[INFO] [stderr]    = note: cannot satisfy `std::string::String: std::convert::AsRef<_>`
[INFO] [stderr] 
[INFO] [stderr] error: aborting due to previous error; 1 warning emitted
[INFO] [stderr] 
[INFO] [stderr] For more information about this error, try `rustc --explain E0283`.
[INFO] [stderr] error: could not compile `symbolics_calculus`.
[INFO] [stderr] 
[INFO] [stderr] To learn more, run the command again with --verbose.
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[INFO] [stderr] error: build failed
[INFO] running `"docker" "inspect" "a3bd2975f437ccaf49416dd550faf12ac5b12233e3fc8e656fa5a8184d4baa21"`
[INFO] running `"docker" "rm" "-f" "a3bd2975f437ccaf49416dd550faf12ac5b12233e3fc8e656fa5a8184d4baa21"`
[INFO] [stdout] a3bd2975f437ccaf49416dd550faf12ac5b12233e3fc8e656fa5a8184d4baa21