[INFO] fetching crate bitconch-jsonrpc-pubsub 0.1.0...
[INFO] testing bitconch-jsonrpc-pubsub-0.1.0 against 1.54.0 for beta-1.55-1
[INFO] extracting crate bitconch-jsonrpc-pubsub 0.1.0 into /workspace/builds/worker-114/source
[INFO] validating manifest of crates.io crate bitconch-jsonrpc-pubsub 0.1.0 on toolchain 1.54.0
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.54.0" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking crates.io crate bitconch-jsonrpc-pubsub 0.1.0
[INFO] finished tweaking crates.io crate bitconch-jsonrpc-pubsub 0.1.0
[INFO] tweaked toml for crates.io crate bitconch-jsonrpc-pubsub 0.1.0 written to /workspace/builds/worker-114/source/Cargo.toml
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.54.0" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.54.0" "fetch" "--manifest-path" "Cargo.toml", 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] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-114/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-114/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@sha256:34b6a614d2c27851fe6cbf88fbd1137609cefab8b10d0615aaeb6fd47975d74e" "/opt/rustwide/cargo-home/bin/cargo" "+1.54.0" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] a4cc86c6116c64b9e7b6c4d9f96299aa96db14bfa35e5fc4bc96b1769b88a6b8
[INFO] running `Command { std: "docker" "start" "-a" "a4cc86c6116c64b9e7b6c4d9f96299aa96db14bfa35e5fc4bc96b1769b88a6b8", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "a4cc86c6116c64b9e7b6c4d9f96299aa96db14bfa35e5fc4bc96b1769b88a6b8", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "a4cc86c6116c64b9e7b6c4d9f96299aa96db14bfa35e5fc4bc96b1769b88a6b8", kill_on_drop: false }`
[INFO] [stdout] a4cc86c6116c64b9e7b6c4d9f96299aa96db14bfa35e5fc4bc96b1769b88a6b8
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-114/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-114/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=warn" "-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@sha256:34b6a614d2c27851fe6cbf88fbd1137609cefab8b10d0615aaeb6fd47975d74e" "/opt/rustwide/cargo-home/bin/cargo" "+1.54.0" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] d0b1abfc3a1ba4d44f493c6ede8d292e2b32be32166db66a2d17cd78697f45a1
[INFO] running `Command { std: "docker" "start" "-a" "d0b1abfc3a1ba4d44f493c6ede8d292e2b32be32166db66a2d17cd78697f45a1", kill_on_drop: false }`
[INFO] [stderr]    Compiling rand_core v0.4.2
[INFO] [stderr]    Compiling serde v1.0.127
[INFO] [stderr]    Compiling serde_derive v1.0.127
[INFO] [stderr]    Compiling serde_json v1.0.66
[INFO] [stderr]    Compiling scopeguard v0.3.3
[INFO] [stderr]    Compiling itoa v0.4.7
[INFO] [stderr]    Compiling futures v0.1.31
[INFO] [stderr]    Compiling owning_ref v0.4.1
[INFO] [stderr]    Compiling parking_lot_core v0.3.1
[INFO] [stderr]    Compiling smallvec v0.6.14
[INFO] [stderr]    Compiling lock_api v0.1.5
[INFO] [stderr]    Compiling rand_core v0.3.1
[INFO] [stderr]    Compiling rand v0.5.6
[INFO] [stderr]    Compiling parking_lot v0.6.4
[INFO] [stderr]    Compiling bitconch-jsonrpc-core v0.1.0
[INFO] [stderr]    Compiling bitconch-jsonrpc-pubsub v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]   --> src/subscription.rs:18:68
[INFO] [stdout]    |
[INFO] [stdout] 18 |     active_subscriptions: Mutex<HashMap<(SubscriptionId, String), Box<Fn(SubscriptionId) + Send + 'static>>>,
[INFO] [stdout]    |                                                                       ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: use `dyn`: `dyn Fn(SubscriptionId) + Send + 'static`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(bare_trait_objects)]` on by default
[INFO] [stdout]    = warning: this was previously accepted by the compiler but is being phased out; it will become a hard error in the 2021 edition!
[INFO] [stdout]    = note: for more information, see issue #80165 <https://github.com/rust-lang/rust/issues/80165>
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]   --> src/subscription.rs:20:25
[INFO] [stdout]    |
[INFO] [stdout] 20 |     on_drop: Mutex<Vec<Box<Fn() + Send>>>,
[INFO] [stdout]    |                            ^^^^^^^^^^^ help: use `dyn`: `dyn Fn() + Send`
[INFO] [stdout]    |
[INFO] [stdout]    = warning: this was previously accepted by the compiler but is being phased out; it will become a hard error in the 2021 edition!
[INFO] [stdout]    = note: for more information, see issue #80165 <https://github.com/rust-lang/rust/issues/80165>
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]   --> src/subscription.rs:49:37
[INFO] [stdout]    |
[INFO] [stdout] 49 |     pub fn on_drop(&self, on_drop: Box<Fn() + Send>) {
[INFO] [stdout]    |                                        ^^^^^^^^^^^ help: use `dyn`: `dyn Fn() + Send`
[INFO] [stdout]    |
[INFO] [stdout]    = warning: this was previously accepted by the compiler but is being phased out; it will become a hard error in the 2021 edition!
[INFO] [stdout]    = note: for more information, see issue #80165 <https://github.com/rust-lang/rust/issues/80165>
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 3 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 11.06s
[INFO] running `Command { std: "docker" "inspect" "d0b1abfc3a1ba4d44f493c6ede8d292e2b32be32166db66a2d17cd78697f45a1", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "d0b1abfc3a1ba4d44f493c6ede8d292e2b32be32166db66a2d17cd78697f45a1", kill_on_drop: false }`
[INFO] [stdout] d0b1abfc3a1ba4d44f493c6ede8d292e2b32be32166db66a2d17cd78697f45a1
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-114/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-114/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=warn" "-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@sha256:34b6a614d2c27851fe6cbf88fbd1137609cefab8b10d0615aaeb6fd47975d74e" "/opt/rustwide/cargo-home/bin/cargo" "+1.54.0" "test" "--frozen" "--no-run" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 3fb173014fcff3c750c3de15213bf6512b88bde24a2dec2cc5b3bcb825552994
[INFO] running `Command { std: "docker" "start" "-a" "3fb173014fcff3c750c3de15213bf6512b88bde24a2dec2cc5b3bcb825552994", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]    Compiling slab v0.4.4
[INFO] [stderr]    Compiling memchr v2.4.0
[INFO] [stderr]    Compiling regex-syntax v0.6.25
[INFO] [stderr]    Compiling memoffset v0.5.6
[INFO] [stderr]    Compiling crossbeam-epoch v0.8.2
[INFO] [stderr]    Compiling lock_api v0.3.4
[INFO] [stderr]    Compiling tokio-sync v0.1.8
[INFO] [stderr]    Compiling unicase v2.6.0
[INFO] [stderr]    Compiling tokio-service v0.1.0
[INFO] [stderr]    Compiling iovec v0.1.4
[INFO] [stderr]    Compiling net2 v0.2.37
[INFO] [stderr]    Compiling num_cpus v1.13.0
[INFO] [stderr]    Compiling parking_lot_core v0.6.2
[INFO] [stderr]    Compiling parking_lot v0.9.0
[INFO] [stderr]    Compiling tokio-executor v0.1.10
[INFO] [stderr]    Compiling crossbeam-queue v0.2.3
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]   --> src/subscription.rs:18:68
[INFO] [stdout]    |
[INFO] [stdout] 18 |     active_subscriptions: Mutex<HashMap<(SubscriptionId, String), Box<Fn(SubscriptionId) + Send + 'static>>>,
[INFO] [stdout]    |                                                                       ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: use `dyn`: `dyn Fn(SubscriptionId) + Send + 'static`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(bare_trait_objects)]` on by default
[INFO] [stdout]    = warning: this was previously accepted by the compiler but is being phased out; it will become a hard error in the 2021 edition!
[INFO] [stdout]    = note: for more information, see issue #80165 <https://github.com/rust-lang/rust/issues/80165>
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]   --> src/subscription.rs:20:25
[INFO] [stdout]    |
[INFO] [stdout] 20 |     on_drop: Mutex<Vec<Box<Fn() + Send>>>,
[INFO] [stdout]    |                            ^^^^^^^^^^^ help: use `dyn`: `dyn Fn() + Send`
[INFO] [stdout]    |
[INFO] [stdout]    = warning: this was previously accepted by the compiler but is being phased out; it will become a hard error in the 2021 edition!
[INFO] [stdout]    = note: for more information, see issue #80165 <https://github.com/rust-lang/rust/issues/80165>
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]   --> src/subscription.rs:49:37
[INFO] [stdout]    |
[INFO] [stdout] 49 |     pub fn on_drop(&self, on_drop: Box<Fn() + Send>) {
[INFO] [stdout]    |                                        ^^^^^^^^^^^ help: use `dyn`: `dyn Fn() + Send`
[INFO] [stdout]    |
[INFO] [stdout]    = warning: this was previously accepted by the compiler but is being phased out; it will become a hard error in the 2021 edition!
[INFO] [stdout]    = note: for more information, see issue #80165 <https://github.com/rust-lang/rust/issues/80165>
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 3 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]    Compiling bytes v0.4.12
[INFO] [stderr]    Compiling tokio-current-thread v0.1.7
[INFO] [stderr]    Compiling mio v0.6.23
[INFO] [stderr]    Compiling tokio-timer v0.2.13
[INFO] [stderr]    Compiling tokio-io v0.1.13
[INFO] [stderr]    Compiling mio-uds v0.6.8
[INFO] [stderr]    Compiling tokio-reactor v0.1.12
[INFO] [stderr]    Compiling tokio-codec v0.1.2
[INFO] [stderr]    Compiling aho-corasick v0.7.18
[INFO] [stderr]    Compiling bstr v0.2.16
[INFO] [stderr]    Compiling crossbeam-deque v0.7.4
[INFO] [stderr]    Compiling tokio-udp v0.1.6
[INFO] [stderr]    Compiling tokio-tcp v0.1.4
[INFO] [stderr]    Compiling tokio-uds v0.2.7
[INFO] [stderr]    Compiling tokio-threadpool v0.1.18
[INFO] [stderr]    Compiling regex v1.5.4
[INFO] [stderr]    Compiling tokio-fs v0.1.7
[INFO] [stderr]    Compiling tokio v0.1.22
[INFO] [stderr]    Compiling globset v0.4.8
[INFO] [stderr]    Compiling bitconch-jsonrpc-server-utils v0.1.0
[INFO] [stderr]    Compiling bitconch-jsonrpc-tcp-server v0.1.0
[INFO] [stderr]    Compiling bitconch-jsonrpc-pubsub v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]   --> src/subscription.rs:18:68
[INFO] [stdout]    |
[INFO] [stdout] 18 |     active_subscriptions: Mutex<HashMap<(SubscriptionId, String), Box<Fn(SubscriptionId) + Send + 'static>>>,
[INFO] [stdout]    |                                                                       ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: use `dyn`: `dyn Fn(SubscriptionId) + Send + 'static`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(bare_trait_objects)]` on by default
[INFO] [stdout]    = warning: this was previously accepted by the compiler but is being phased out; it will become a hard error in the 2021 edition!
[INFO] [stdout]    = note: for more information, see issue #80165 <https://github.com/rust-lang/rust/issues/80165>
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]   --> src/subscription.rs:20:25
[INFO] [stdout]    |
[INFO] [stdout] 20 |     on_drop: Mutex<Vec<Box<Fn() + Send>>>,
[INFO] [stdout]    |                            ^^^^^^^^^^^ help: use `dyn`: `dyn Fn() + Send`
[INFO] [stdout]    |
[INFO] [stdout]    = warning: this was previously accepted by the compiler but is being phased out; it will become a hard error in the 2021 edition!
[INFO] [stdout]    = note: for more information, see issue #80165 <https://github.com/rust-lang/rust/issues/80165>
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]   --> src/subscription.rs:49:37
[INFO] [stdout]    |
[INFO] [stdout] 49 |     pub fn on_drop(&self, on_drop: Box<Fn() + Send>) {
[INFO] [stdout]    |                                        ^^^^^^^^^^^ help: use `dyn`: `dyn Fn() + Send`
[INFO] [stdout]    |
[INFO] [stdout]    = warning: this was previously accepted by the compiler but is being phased out; it will become a hard error in the 2021 edition!
[INFO] [stdout]    = note: for more information, see issue #80165 <https://github.com/rust-lang/rust/issues/80165>
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 3 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished test [unoptimized + debuginfo] target(s) in 17.02s
[INFO] running `Command { std: "docker" "inspect" "3fb173014fcff3c750c3de15213bf6512b88bde24a2dec2cc5b3bcb825552994", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "3fb173014fcff3c750c3de15213bf6512b88bde24a2dec2cc5b3bcb825552994", kill_on_drop: false }`
[INFO] [stdout] 3fb173014fcff3c750c3de15213bf6512b88bde24a2dec2cc5b3bcb825552994
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-114/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-114/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=warn" "-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@sha256:34b6a614d2c27851fe6cbf88fbd1137609cefab8b10d0615aaeb6fd47975d74e" "/opt/rustwide/cargo-home/bin/cargo" "+1.54.0" "test" "--frozen", kill_on_drop: false }`
[INFO] [stdout] bd3c6c1d2818d4e41956ef5f967839acd6a8c3b0dc965cf60350a87d3194fe70
[INFO] running `Command { std: "docker" "start" "-a" "bd3c6c1d2818d4e41956ef5f967839acd6a8c3b0dc965cf60350a87d3194fe70", kill_on_drop: false }`
[INFO] [stderr] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stderr]   --> src/subscription.rs:18:68
[INFO] [stderr]    |
[INFO] [stderr] 18 |     active_subscriptions: Mutex<HashMap<(SubscriptionId, String), Box<Fn(SubscriptionId) + Send + 'static>>>,
[INFO] [stderr]    |                                                                       ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: use `dyn`: `dyn Fn(SubscriptionId) + Send + 'static`
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(bare_trait_objects)]` on by default
[INFO] [stderr]    = warning: this was previously accepted by the compiler but is being phased out; it will become a hard error in the 2021 edition!
[INFO] [stderr]    = note: for more information, see issue #80165 <https://github.com/rust-lang/rust/issues/80165>
[INFO] [stderr] 
[INFO] [stderr] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stderr]   --> src/subscription.rs:20:25
[INFO] [stderr]    |
[INFO] [stderr] 20 |     on_drop: Mutex<Vec<Box<Fn() + Send>>>,
[INFO] [stderr]    |                            ^^^^^^^^^^^ help: use `dyn`: `dyn Fn() + Send`
[INFO] [stderr]    |
[INFO] [stderr]    = warning: this was previously accepted by the compiler but is being phased out; it will become a hard error in the 2021 edition!
[INFO] [stderr]    = note: for more information, see issue #80165 <https://github.com/rust-lang/rust/issues/80165>
[INFO] [stderr] 
[INFO] [stderr] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stderr]   --> src/subscription.rs:49:37
[INFO] [stderr]    |
[INFO] [stderr] 49 |     pub fn on_drop(&self, on_drop: Box<Fn() + Send>) {
[INFO] [stderr]    |                                        ^^^^^^^^^^^ help: use `dyn`: `dyn Fn() + Send`
[INFO] [stderr]    |
[INFO] [stderr]    = warning: this was previously accepted by the compiler but is being phased out; it will become a hard error in the 2021 edition!
[INFO] [stderr]    = note: for more information, see issue #80165 <https://github.com/rust-lang/rust/issues/80165>
[INFO] [stderr] 
[INFO] [stderr] warning: 3 warnings emitted
[INFO] [stderr] 
[INFO] [stderr] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stderr]   --> src/subscription.rs:18:68
[INFO] [stderr]    |
[INFO] [stderr] 18 |     active_subscriptions: Mutex<HashMap<(SubscriptionId, String), Box<Fn(SubscriptionId) + Send + 'static>>>,
[INFO] [stderr]    |                                                                       ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: use `dyn`: `dyn Fn(SubscriptionId) + Send + 'static`
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(bare_trait_objects)]` on by default
[INFO] [stderr]    = warning: this was previously accepted by the compiler but is being phased out; it will become a hard error in the 2021 edition!
[INFO] [stderr]    = note: for more information, see issue #80165 <https://github.com/rust-lang/rust/issues/80165>
[INFO] [stderr] 
[INFO] [stderr] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stderr]   --> src/subscription.rs:20:25
[INFO] [stderr]    |
[INFO] [stderr] 20 |     on_drop: Mutex<Vec<Box<Fn() + Send>>>,
[INFO] [stderr]    |                            ^^^^^^^^^^^ help: use `dyn`: `dyn Fn() + Send`
[INFO] [stderr]    |
[INFO] [stderr]    = warning: this was previously accepted by the compiler but is being phased out; it will become a hard error in the 2021 edition!
[INFO] [stderr]    = note: for more information, see issue #80165 <https://github.com/rust-lang/rust/issues/80165>
[INFO] [stderr] 
[INFO] [stderr] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stderr]   --> src/subscription.rs:49:37
[INFO] [stderr]    |
[INFO] [stderr] 49 |     pub fn on_drop(&self, on_drop: Box<Fn() + Send>) {
[INFO] [stderr]    |                                        ^^^^^^^^^^^ help: use `dyn`: `dyn Fn() + Send`
[INFO] [stderr]    |
[INFO] [stderr]    = warning: this was previously accepted by the compiler but is being phased out; it will become a hard error in the 2021 edition!
[INFO] [stderr]    = note: for more information, see issue #80165 <https://github.com/rust-lang/rust/issues/80165>
[INFO] [stderr] 
[INFO] [stderr] warning: 3 warnings emitted
[INFO] [stderr] 
[INFO] [stderr]     Finished test [unoptimized + debuginfo] target(s) in 0.13s
[INFO] [stderr]      Running unittests (/opt/rustwide/target/debug/deps/bitconch_jsonrpc_pubsub-904e7fd0989779e0)
[INFO] [stdout] 
[INFO] [stdout] running 9 tests
[INFO] [stdout] test subscription::tests::should_reject ... ok
[INFO] [stdout] test handler::tests::should_handle_subscription ... ok
[INFO] [stdout] test subscription::tests::should_remove_subscription ... ok
[INFO] [stdout] test subscription::tests::should_send_notification_to_the_transport ... ok
[INFO] [stdout] test subscription::tests::should_subscribe ... ok
[INFO] [stdout] test subscription::tests::should_unregister_on_drop ... ok
[INFO] [stdout] test types::tests::should_convert_between_value_and_subscription_id ... ok
[INFO] [stdout] test subscription::tests::should_unregister_in_case_of_collision ... ok
[INFO] [stdout] test subscription::tests::should_assign_id ... ok
[INFO] [stdout] 
[INFO] [stdout] test result: ok. 9 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 0.00s
[INFO] [stdout] 
[INFO] [stderr]    Doc-tests bitconch-jsonrpc-pubsub
[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" "bd3c6c1d2818d4e41956ef5f967839acd6a8c3b0dc965cf60350a87d3194fe70", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "bd3c6c1d2818d4e41956ef5f967839acd6a8c3b0dc965cf60350a87d3194fe70", kill_on_drop: false }`
[INFO] [stdout] bd3c6c1d2818d4e41956ef5f967839acd6a8c3b0dc965cf60350a87d3194fe70
