[INFO] fetching crate observables 0.1.0...
[INFO] checking observables-0.1.0 against try#024378d9203a4009ed73d6db2681b88a8d74ce7a for pr-112160
[INFO] extracting crate observables 0.1.0 into /workspace/builds/worker-6-tc2/source
[INFO] validating manifest of crates.io crate observables 0.1.0 on toolchain 024378d9203a4009ed73d6db2681b88a8d74ce7a
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+024378d9203a4009ed73d6db2681b88a8d74ce7a" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking crates.io crate observables 0.1.0
[INFO] finished tweaking crates.io crate observables 0.1.0
[INFO] tweaked toml for crates.io crate observables 0.1.0 written to /workspace/builds/worker-6-tc2/source/Cargo.toml
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+024378d9203a4009ed73d6db2681b88a8d74ce7a" "generate-lockfile" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Updating crates.io index
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+024378d9203a4009ed73d6db2681b88a8d74ce7a" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-6-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-6-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@sha256:19e73879b68f455e41552ea35293514db52ea292d993f571636dbffedb77a1ee" "/opt/rustwide/cargo-home/bin/cargo" "+024378d9203a4009ed73d6db2681b88a8d74ce7a" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] dda4da983c21e0d55835fc4292386171c82ce7891755d25d624e1e92f5b6315a
[INFO] running `Command { std: "docker" "start" "-a" "dda4da983c21e0d55835fc4292386171c82ce7891755d25d624e1e92f5b6315a", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "dda4da983c21e0d55835fc4292386171c82ce7891755d25d624e1e92f5b6315a", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "dda4da983c21e0d55835fc4292386171c82ce7891755d25d624e1e92f5b6315a", kill_on_drop: false }`
[INFO] [stdout] dda4da983c21e0d55835fc4292386171c82ce7891755d25d624e1e92f5b6315a
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-6-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-6-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@sha256:19e73879b68f455e41552ea35293514db52ea292d993f571636dbffedb77a1ee" "/opt/rustwide/cargo-home/bin/cargo" "+024378d9203a4009ed73d6db2681b88a8d74ce7a" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 42708d8c3513d88b598479a0928cd2706d14ae1aafb85741d48e223d7bc007e8
[INFO] running `Command { std: "docker" "start" "-a" "42708d8c3513d88b598479a0928cd2706d14ae1aafb85741d48e223d7bc007e8", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]    Compiling autocfg v1.1.0
[INFO] [stderr]    Compiling rand_core v0.4.2
[INFO] [stderr]    Compiling proc-macro2 v1.0.59
[INFO] [stderr]    Compiling unicode-ident v1.0.9
[INFO] [stderr]    Compiling quote v1.0.28
[INFO] [stderr]    Compiling libc v0.2.145
[INFO] [stderr]    Compiling proc-macro2 v0.4.30
[INFO] [stderr]    Compiling futures-core v0.3.28
[INFO] [stderr]    Compiling unicode-xid v0.1.0
[INFO] [stderr]    Compiling crossbeam-utils v0.8.15
[INFO] [stderr]    Compiling futures-task v0.3.28
[INFO] [stderr]    Compiling syn v0.15.44
[INFO] [stderr]    Compiling serde v1.0.163
[INFO] [stderr]     Checking cfg-if v1.0.0
[INFO] [stderr]    Compiling futures-channel v0.3.28
[INFO] [stderr]    Compiling futures-util v0.3.28
[INFO] [stderr]    Compiling log v0.4.18
[INFO] [stderr]     Checking pin-utils v0.1.0
[INFO] [stderr]     Checking pin-project-lite v0.2.9
[INFO] [stderr]     Checking discard v1.0.4
[INFO] [stderr]    Compiling rand_core v0.3.1
[INFO] [stderr]    Compiling autocfg v0.1.8
[INFO] [stderr]    Compiling rand_hc v0.1.0
[INFO] [stderr]    Compiling rand_xorshift v0.1.1
[INFO] [stderr]    Compiling rand_isaac v0.1.1
[INFO] [stderr]    Compiling rand_jitter v0.1.4
[INFO] [stderr]     Checking event-listener v2.5.3
[INFO] [stderr]     Checking waker-fn v1.1.0
[INFO] [stderr]    Compiling rand_chacha v0.1.1
[INFO] [stderr]    Compiling rand_pcg v0.1.2
[INFO] [stderr]    Compiling rand v0.6.5
[INFO] [stderr]    Compiling slab v0.4.8
[INFO] [stderr]     Checking concurrent-queue v2.2.0
[INFO] [stderr]     Checking async-channel v1.8.0
[INFO] [stderr]    Compiling quote v0.6.13
[INFO] [stderr]    Compiling syn v2.0.18
[INFO] [stderr]    Compiling rand_os v0.1.3
[INFO] [stderr]    Compiling uuid v0.7.4
[INFO] [stderr]    Compiling gensym v0.1.0
[INFO] [stderr]    Compiling pin-project-internal v1.1.0
[INFO] [stderr]    Compiling serde_derive v1.0.163
[INFO] [stderr]    Compiling futures-macro v0.3.28
[INFO] [stderr]     Checking pin-project v1.1.0
[INFO] [stderr]     Checking futures-signals v0.3.32
[INFO] [stderr]     Checking observables v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: using `.deref()` on a double reference, which returns `&T` instead of dereferencing the inner type
[INFO] [stdout]   --> src/lib.rs:41:45
[INFO] [stdout]    |
[INFO] [stdout] 41 |             ObservableBorrow::Borrow(x) => x.deref(),
[INFO] [stdout]    |                                             ^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(suspicious_double_ref_op)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: using `.deref()` on a double reference, which returns `&T` instead of dereferencing the inner type
[INFO] [stdout]   --> src/lib.rs:41:45
[INFO] [stdout]    |
[INFO] [stdout] 41 |             ObservableBorrow::Borrow(x) => x.deref(),
[INFO] [stdout]    |                                             ^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(suspicious_double_ref_op)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: call to `.borrow()` on a reference in this situation does nothing
[INFO] [stdout]   --> src/transformers/map.rs:52:32
[INFO] [stdout]    |
[INFO] [stdout] 52 |             v.as_ref().unwrap().borrow()
[INFO] [stdout]    |                                ^^^^^^^^^ unnecessary method call
[INFO] [stdout]    |
[INFO] [stdout]    = note: the type `O` does not implement `Borrow`, so calling `borrow` on `&O` copies the reference, which does not do anything and can be removed
[INFO] [stdout]    = note: `#[deny(noop_method_call)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: call to `.borrow()` on a reference in this situation does nothing
[INFO] [stdout]   --> src/transformers/map.rs:52:32
[INFO] [stdout]    |
[INFO] [stdout] 52 |             v.as_ref().unwrap().borrow()
[INFO] [stdout]    |                                ^^^^^^^^^ unnecessary method call
[INFO] [stdout]    |
[INFO] [stdout]    = note: the type `O` does not implement `Borrow`, so calling `borrow` on `&O` copies the reference, which does not do anything and can be removed
[INFO] [stdout]    = note: `#[deny(noop_method_call)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: using `.borrow()` on a double reference, which returns `&T` instead of borrowing the inner type
[INFO] [stdout]   --> src/cell/mod.rs:63:19
[INFO] [stdout]    |
[INFO] [stdout] 63 |             r.data.borrow()
[INFO] [stdout]    |                   ^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: using `.borrow()` on a double reference, which returns `&T` instead of borrowing the inner type
[INFO] [stdout]   --> src/cell/mod.rs:63:19
[INFO] [stdout]    |
[INFO] [stdout] 63 |             r.data.borrow()
[INFO] [stdout]    |                   ^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: aborting due to previous error; 2 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: aborting due to previous error; 2 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `observables` (lib) due to 2 previous errors; 2 warnings emitted
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[INFO] [stderr] error: could not compile `observables` (lib test) due to 2 previous errors; 2 warnings emitted
[INFO] running `Command { std: "docker" "inspect" "42708d8c3513d88b598479a0928cd2706d14ae1aafb85741d48e223d7bc007e8", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "42708d8c3513d88b598479a0928cd2706d14ae1aafb85741d48e223d7bc007e8", kill_on_drop: false }`
[INFO] [stdout] 42708d8c3513d88b598479a0928cd2706d14ae1aafb85741d48e223d7bc007e8