[INFO] fetching crate symbolics_calculus 0.1.5...
[INFO] checking symbolics_calculus-0.1.5 against master#836c31742687ba4e2f857b5b698e1e9e6b67619c for pr-81789
[INFO] extracting crate symbolics_calculus 0.1.5 into /workspace/builds/worker-9/source
[INFO] validating manifest of crates.io crate symbolics_calculus 0.1.5 on toolchain 836c31742687ba4e2f857b5b698e1e9e6b67619c
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+836c31742687ba4e2f857b5b698e1e9e6b67619c" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[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-9/source/Cargo.toml
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+836c31742687ba4e2f857b5b698e1e9e6b67619c" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update", kill_on_drop: false }`
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+836c31742687ba4e2f857b5b698e1e9e6b67619c" "fetch" "--locked" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-9/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-9/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@sha256:20528e8c29e4536546f0102ce88568b16ea7538393a33fcca951030f7af10457" "/opt/rustwide/cargo-home/bin/cargo" "+836c31742687ba4e2f857b5b698e1e9e6b67619c" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 15b061bd4a082648baccd8c821aca01ca6372c8b05ce9e8cdace96beab4fbe3b
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] running `Command { std: "docker" "start" "-a" "15b061bd4a082648baccd8c821aca01ca6372c8b05ce9e8cdace96beab4fbe3b", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "15b061bd4a082648baccd8c821aca01ca6372c8b05ce9e8cdace96beab4fbe3b", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "15b061bd4a082648baccd8c821aca01ca6372c8b05ce9e8cdace96beab4fbe3b", kill_on_drop: false }`
[INFO] [stdout] 15b061bd4a082648baccd8c821aca01ca6372c8b05ce9e8cdace96beab4fbe3b
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-9/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-9/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" "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@sha256:20528e8c29e4536546f0102ce88568b16ea7538393a33fcca951030f7af10457" "/opt/rustwide/cargo-home/bin/cargo" "+836c31742687ba4e2f857b5b698e1e9e6b67619c" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] edfd41fa15742e757d13ec2faf4e0730717d2744ebed9cf0654aaa998834a21b
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] running `Command { std: "docker" "start" "-a" "edfd41fa15742e757d13ec2faf4e0730717d2744ebed9cf0654aaa998834a21b", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]     Checking symbolics_core v0.1.5
[INFO] [stderr]     Checking symbolics_calculus v0.1.5 (/opt/rustwide/workdir)
[INFO] [stdout] warning: unused imports: `apply`, `s`
[INFO] [stdout]  --> src/lib.rs:3:22
[INFO] [stdout]   |
[INFO] [stdout] 3 | use symbolics_core::{s, apply};
[INFO] [stdout]   |                      ^  ^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0283]: type annotations needed
[INFO] [stdout]   --> src/lib.rs:16:47
[INFO] [stdout]    |
[INFO] [stdout] 16 |             Add(a, b) => a.clone().deriv1(wrt.as_ref()) + b.clone().deriv1(wrt.as_ref()),
[INFO] [stdout]    |                                           ----^^^^^^--
[INFO] [stdout]    |                                           |   |
[INFO] [stdout]    |                                           |   cannot infer type for type parameter `T` declared on the trait `AsRef`
[INFO] [stdout]    |                                           this method call resolves to `&T`
[INFO] [stdout]    |
[INFO] [stdout]    = note: cannot satisfy `String: AsRef<_>`
[INFO] [stdout] help: use the fully qualified path for the potential candidates
[INFO] [stdout]    |
[INFO] [stdout] 16 |             Add(a, b) => a.clone().deriv1(<String as AsRef<Path>>::as_ref(wrt)) + b.clone().deriv1(wrt.as_ref()),
[INFO] [stdout]    |                                           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 16 |             Add(a, b) => a.clone().deriv1(<String as AsRef<OsStr>>::as_ref(wrt)) + b.clone().deriv1(wrt.as_ref()),
[INFO] [stdout]    |                                           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 16 |             Add(a, b) => a.clone().deriv1(<String as AsRef<str>>::as_ref(wrt)) + b.clone().deriv1(wrt.as_ref()),
[INFO] [stdout]    |                                           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 16 |             Add(a, b) => a.clone().deriv1(<String as AsRef<[u8]>>::as_ref(wrt)) + b.clone().deriv1(wrt.as_ref()),
[INFO] [stdout]    |                                           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: aborting due to previous error; 1 warning emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] For more information about this error, try `rustc --explain E0283`.
[INFO] [stdout] 
[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] [stdout] error[E0283]: type annotations needed
[INFO] [stdout]   --> src/lib.rs:16:47
[INFO] [stdout]    |
[INFO] [stdout] 16 |             Add(a, b) => a.clone().deriv1(wrt.as_ref()) + b.clone().deriv1(wrt.as_ref()),
[INFO] [stdout]    |                                           ----^^^^^^--
[INFO] [stdout]    |                                           |   |
[INFO] [stdout]    |                                           |   cannot infer type for type parameter `T` declared on the trait `AsRef`
[INFO] [stdout]    |                                           this method call resolves to `&T`
[INFO] [stdout]    |
[INFO] [stdout]    = note: cannot satisfy `String: AsRef<_>`
[INFO] [stdout] help: use the fully qualified path for the potential candidates
[INFO] [stdout]    |
[INFO] [stdout] 16 |             Add(a, b) => a.clone().deriv1(<String as AsRef<Path>>::as_ref(wrt)) + b.clone().deriv1(wrt.as_ref()),
[INFO] [stdout]    |                                           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 16 |             Add(a, b) => a.clone().deriv1(<String as AsRef<OsStr>>::as_ref(wrt)) + b.clone().deriv1(wrt.as_ref()),
[INFO] [stdout]    |                                           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 16 |             Add(a, b) => a.clone().deriv1(<String as AsRef<str>>::as_ref(wrt)) + b.clone().deriv1(wrt.as_ref()),
[INFO] [stdout]    |                                           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 16 |             Add(a, b) => a.clone().deriv1(<String as AsRef<[u8]>>::as_ref(wrt)) + b.clone().deriv1(wrt.as_ref()),
[INFO] [stdout]    |                                           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: aborting due to previous error
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] For more information about this error, try `rustc --explain E0283`.
[INFO] [stdout] 
[INFO] [stderr] error: build failed
[INFO] running `Command { std: "docker" "inspect" "edfd41fa15742e757d13ec2faf4e0730717d2744ebed9cf0654aaa998834a21b", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "edfd41fa15742e757d13ec2faf4e0730717d2744ebed9cf0654aaa998834a21b", kill_on_drop: false }`
[INFO] [stdout] edfd41fa15742e757d13ec2faf4e0730717d2744ebed9cf0654aaa998834a21b