[INFO] fetching crate observable-react 0.2.0...
[INFO] checking observable-react-0.2.0 against master#385fa9d845dd326c6bbfd58c22244215e431948a for never-type-fallback-to-never
[INFO] extracting crate observable-react 0.2.0 into /workspace/builds/worker-0-tc1/source
[INFO] validating manifest of crates.io crate observable-react 0.2.0 on toolchain 385fa9d845dd326c6bbfd58c22244215e431948a
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+385fa9d845dd326c6bbfd58c22244215e431948a" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking crates.io crate observable-react 0.2.0
[INFO] finished tweaking crates.io crate observable-react 0.2.0
[INFO] tweaked toml for crates.io crate observable-react 0.2.0 written to /workspace/builds/worker-0-tc1/source/Cargo.toml
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+385fa9d845dd326c6bbfd58c22244215e431948a" "generate-lockfile" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]     Updating crates.io index
[INFO] [stderr]      Locking 28 packages
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+385fa9d845dd326c6bbfd58c22244215e431948a" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]  Downloading crates ...
[INFO] [stderr]   Downloaded observable-rs v0.2.0
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-0-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-0-tc1/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@sha256:2788e3201cd34a07e3172128adcd8b3090168a8e3bcc40d7c032b9dda1df7d1c" "/opt/rustwide/cargo-home/bin/cargo" "+385fa9d845dd326c6bbfd58c22244215e431948a" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] f5e354a8873d8a4bce1db264ebd3f0f835fe0ca18e399a3627b0ad92133fddea
[INFO] running `Command { std: "docker" "start" "-a" "f5e354a8873d8a4bce1db264ebd3f0f835fe0ca18e399a3627b0ad92133fddea", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "f5e354a8873d8a4bce1db264ebd3f0f835fe0ca18e399a3627b0ad92133fddea", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "f5e354a8873d8a4bce1db264ebd3f0f835fe0ca18e399a3627b0ad92133fddea", kill_on_drop: false }`
[INFO] [stdout] f5e354a8873d8a4bce1db264ebd3f0f835fe0ca18e399a3627b0ad92133fddea
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-0-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-0-tc1/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@sha256:2788e3201cd34a07e3172128adcd8b3090168a8e3bcc40d7c032b9dda1df7d1c" "/opt/rustwide/cargo-home/bin/cargo" "+385fa9d845dd326c6bbfd58c22244215e431948a" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 519aae9585c4717ecccc70a763448261048730d468a8b8d0ab37183f1c44e6be
[INFO] running `Command { std: "docker" "start" "-a" "519aae9585c4717ecccc70a763448261048730d468a8b8d0ab37183f1c44e6be", kill_on_drop: false }`
[INFO] [stderr]    Compiling wasm-bindgen v0.2.92
[INFO] [stderr]     Checking scoped-tls v1.0.1
[INFO] [stderr]     Checking dyn-clone v1.0.17
[INFO] [stderr]     Checking observable-rs v0.2.0
[INFO] [stderr]    Compiling serde_derive v1.0.197
[INFO] [stderr]    Compiling wasm-bindgen-backend v0.2.92
[INFO] [stderr]    Compiling wasm-bindgen-test-macro v0.3.42
[INFO] [stderr]    Compiling wasm-bindgen-macro-support v0.2.92
[INFO] [stderr]    Compiling wasm-bindgen-macro v0.2.92
[INFO] [stderr]     Checking serde v1.0.197
[INFO] [stderr]     Checking serde_json v1.0.115
[INFO] [stderr]     Checking js-sys v0.3.69
[INFO] [stderr]     Checking console_error_panic_hook v0.1.7
[INFO] [stderr]     Checking wasm-bindgen-futures v0.4.42
[INFO] [stderr]     Checking wasm-bindgen-test v0.3.42
[INFO] [stderr]     Checking observable-react v0.2.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: the item `JsValue` is imported redundantly
[INFO] [stdout]   --> src/lib.rs:13:32
[INFO] [stdout]    |
[INFO] [stdout] 13 | use wasm_bindgen::{prelude::*, JsValue};
[INFO] [stdout]    |                    ----------  ^^^^^^^
[INFO] [stdout]    |                    |
[INFO] [stdout]    |                    the item `JsValue` is already imported here
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: the item `JsValue` is imported redundantly
[INFO] [stdout]   --> src/lib.rs:13:32
[INFO] [stdout]    |
[INFO] [stdout] 13 | use wasm_bindgen::{prelude::*, JsValue};
[INFO] [stdout]    |                    ----------  ^^^^^^^
[INFO] [stdout]    |                    |
[INFO] [stdout]    |                    the item `JsValue` is already imported here
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 1 warning emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 1 warning emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished `dev` profile [unoptimized + debuginfo] target(s) in 17.68s
[INFO] running `Command { std: "docker" "inspect" "519aae9585c4717ecccc70a763448261048730d468a8b8d0ab37183f1c44e6be", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "519aae9585c4717ecccc70a763448261048730d468a8b8d0ab37183f1c44e6be", kill_on_drop: false }`
[INFO] [stdout] 519aae9585c4717ecccc70a763448261048730d468a8b8d0ab37183f1c44e6be
[INFO] checking observable-react-0.2.0 against try#2d84f2737f3bd9ebfcb07f75aa198d6cf7c715d2 for never-type-fallback-to-never
[INFO] extracting crate observable-react 0.2.0 into /workspace/builds/worker-0-tc2/source
[INFO] validating manifest of crates.io crate observable-react 0.2.0 on toolchain 2d84f2737f3bd9ebfcb07f75aa198d6cf7c715d2
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+2d84f2737f3bd9ebfcb07f75aa198d6cf7c715d2" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking crates.io crate observable-react 0.2.0
[INFO] finished tweaking crates.io crate observable-react 0.2.0
[INFO] tweaked toml for crates.io crate observable-react 0.2.0 written to /workspace/builds/worker-0-tc2/source/Cargo.toml
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+2d84f2737f3bd9ebfcb07f75aa198d6cf7c715d2" "generate-lockfile" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Updating crates.io index
[INFO] [stderr]      Locking 28 packages
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+2d84f2737f3bd9ebfcb07f75aa198d6cf7c715d2" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-0-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-0-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@sha256:2788e3201cd34a07e3172128adcd8b3090168a8e3bcc40d7c032b9dda1df7d1c" "/opt/rustwide/cargo-home/bin/cargo" "+2d84f2737f3bd9ebfcb07f75aa198d6cf7c715d2" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] fd93fccd2b1dc4dd736b19d91b97038898ed9b9d3035e9c780bd198892df9a7a
[INFO] running `Command { std: "docker" "start" "-a" "fd93fccd2b1dc4dd736b19d91b97038898ed9b9d3035e9c780bd198892df9a7a", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "fd93fccd2b1dc4dd736b19d91b97038898ed9b9d3035e9c780bd198892df9a7a", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "fd93fccd2b1dc4dd736b19d91b97038898ed9b9d3035e9c780bd198892df9a7a", kill_on_drop: false }`
[INFO] [stdout] fd93fccd2b1dc4dd736b19d91b97038898ed9b9d3035e9c780bd198892df9a7a
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-0-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-0-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@sha256:2788e3201cd34a07e3172128adcd8b3090168a8e3bcc40d7c032b9dda1df7d1c" "/opt/rustwide/cargo-home/bin/cargo" "+2d84f2737f3bd9ebfcb07f75aa198d6cf7c715d2" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 9b23edf6ff9a3509b321e18489099f148df1d6b0576c80129ffa6bfdc2af1e7a
[INFO] running `Command { std: "docker" "start" "-a" "9b23edf6ff9a3509b321e18489099f148df1d6b0576c80129ffa6bfdc2af1e7a", kill_on_drop: false }`
[INFO] [stderr]    Compiling wasm-bindgen v0.2.92
[INFO] [stderr]     Checking scoped-tls v1.0.1
[INFO] [stderr]     Checking dyn-clone v1.0.17
[INFO] [stderr]     Checking observable-rs v0.2.0
[INFO] [stderr]    Compiling serde_derive v1.0.197
[INFO] [stderr]    Compiling wasm-bindgen-backend v0.2.92
[INFO] [stderr]    Compiling wasm-bindgen-test-macro v0.3.42
[INFO] [stderr]    Compiling wasm-bindgen-macro-support v0.2.92
[INFO] [stderr]    Compiling wasm-bindgen-macro v0.2.92
[INFO] [stderr]     Checking serde v1.0.197
[INFO] [stderr]     Checking serde_json v1.0.115
[INFO] [stderr]     Checking js-sys v0.3.69
[INFO] [stderr]     Checking console_error_panic_hook v0.1.7
[INFO] [stderr]     Checking wasm-bindgen-futures v0.4.42
[INFO] [stderr]     Checking wasm-bindgen-test v0.3.42
[INFO] [stderr]     Checking observable-react v0.2.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: the item `JsValue` is imported redundantly
[INFO] [stdout]   --> src/lib.rs:13:32
[INFO] [stdout]    |
[INFO] [stdout] 13 | use wasm_bindgen::{prelude::*, JsValue};
[INFO] [stdout]    |                    ----------  ^^^^^^^
[INFO] [stdout]    |                    |
[INFO] [stdout]    |                    the item `JsValue` is already imported here
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: the item `JsValue` is imported redundantly
[INFO] [stdout]   --> src/lib.rs:13:32
[INFO] [stdout]    |
[INFO] [stdout] 13 | use wasm_bindgen::{prelude::*, JsValue};
[INFO] [stdout]    |                    ----------  ^^^^^^^
[INFO] [stdout]    |                    |
[INFO] [stdout]    |                    the item `JsValue` is already imported here
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 1 warning emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 1 warning emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished `dev` profile [unoptimized + debuginfo] target(s) in 16.01s
[INFO] running `Command { std: "docker" "inspect" "9b23edf6ff9a3509b321e18489099f148df1d6b0576c80129ffa6bfdc2af1e7a", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "9b23edf6ff9a3509b321e18489099f148df1d6b0576c80129ffa6bfdc2af1e7a", kill_on_drop: false }`
[INFO] [stdout] 9b23edf6ff9a3509b321e18489099f148df1d6b0576c80129ffa6bfdc2af1e7a