[INFO] fetching crate json-number 0.4.6...
[INFO] checking json-number-0.4.6 against master#385fa9d845dd326c6bbfd58c22244215e431948a for never-type-fallback-to-never
[INFO] extracting crate json-number 0.4.6 into /workspace/builds/worker-4-tc1/source
[INFO] validating manifest of crates.io crate json-number 0.4.6 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 json-number 0.4.6
[INFO] finished tweaking crates.io crate json-number 0.4.6
[INFO] tweaked toml for crates.io crate json-number 0.4.6 written to /workspace/builds/worker-4-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]     Updating crates.io index
[INFO] [stderr]      Locking 20 packages
[INFO] [stderr]       Adding ryu-js v0.2.2 (latest: v1.0.1)
[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]  Downloading crates ...
[INFO] [stderr]   Downloaded ryu-js v0.2.2
[INFO] [stderr]   Downloaded lexical v6.1.1
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-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] b5e58570acb3e975ccf0a55c45c85de881e3430b2a673d1b1e9a44bffa7777f2
[INFO] running `Command { std: "docker" "start" "-a" "b5e58570acb3e975ccf0a55c45c85de881e3430b2a673d1b1e9a44bffa7777f2", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "b5e58570acb3e975ccf0a55c45c85de881e3430b2a673d1b1e9a44bffa7777f2", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "b5e58570acb3e975ccf0a55c45c85de881e3430b2a673d1b1e9a44bffa7777f2", kill_on_drop: false }`
[INFO] [stdout] b5e58570acb3e975ccf0a55c45c85de881e3430b2a673d1b1e9a44bffa7777f2
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-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] ccfa1d00db4009c48f03543d914e21003fc9871b3752c8d28357ec363871047c
[INFO] running `Command { std: "docker" "start" "-a" "ccfa1d00db4009c48f03543d914e21003fc9871b3752c8d28357ec363871047c", kill_on_drop: false }`
[INFO] [stderr]     Checking static_assertions v1.1.0
[INFO] [stderr]     Checking lexical-util v0.8.5
[INFO] [stderr]     Checking lexical-write-integer v0.8.5
[INFO] [stderr]     Checking lexical-parse-integer v0.8.6
[INFO] [stderr]     Checking lexical-write-float v0.8.5
[INFO] [stderr]     Checking lexical-parse-float v0.8.5
[INFO] [stderr]     Checking lexical-core v0.8.5
[INFO] [stderr]     Checking lexical v6.1.1
[INFO] [stderr]     Checking json-number v0.4.6 (/opt/rustwide/workdir)
[INFO] [stdout] warning: the item `ToOwned` is imported redundantly
[INFO] [stdout]   --> src/lib.rs:19:27
[INFO] [stdout]    |
[INFO] [stdout] 19 | use std::borrow::{Borrow, ToOwned};
[INFO] [stdout]    |                           ^^^^^^^
[INFO] [stdout]   --> /rustc/385fa9d845dd326c6bbfd58c22244215e431948a/library/std/src/prelude/mod.rs:144:13
[INFO] [stdout]    |
[INFO] [stdout]    = note: the item `ToOwned` is already defined here
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: the item `ToOwned` is imported redundantly
[INFO] [stdout]   --> src/lib.rs:19:27
[INFO] [stdout]    |
[INFO] [stdout] 19 | use std::borrow::{Borrow, ToOwned};
[INFO] [stdout]    |                           ^^^^^^^
[INFO] [stdout]   --> /rustc/385fa9d845dd326c6bbfd58c22244215e431948a/library/std/src/prelude/mod.rs:144:13
[INFO] [stdout]    |
[INFO] [stdout]    = note: the item `ToOwned` is already defined 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 2.53s
[INFO] running `Command { std: "docker" "inspect" "ccfa1d00db4009c48f03543d914e21003fc9871b3752c8d28357ec363871047c", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "ccfa1d00db4009c48f03543d914e21003fc9871b3752c8d28357ec363871047c", kill_on_drop: false }`
[INFO] [stdout] ccfa1d00db4009c48f03543d914e21003fc9871b3752c8d28357ec363871047c
[INFO] checking json-number-0.4.6 against try#2d84f2737f3bd9ebfcb07f75aa198d6cf7c715d2 for never-type-fallback-to-never
[INFO] extracting crate json-number 0.4.6 into /workspace/builds/worker-4-tc2/source
[INFO] validating manifest of crates.io crate json-number 0.4.6 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 json-number 0.4.6
[INFO] finished tweaking crates.io crate json-number 0.4.6
[INFO] tweaked toml for crates.io crate json-number 0.4.6 written to /workspace/builds/worker-4-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 20 packages
[INFO] [stderr]       Adding ryu-js v0.2.2 (latest: v1.0.1)
[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-4-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-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] bb3414561de3fa67e23361c4267c450ac1a0f8d1dc4949abf532d7b79744d1ef
[INFO] running `Command { std: "docker" "start" "-a" "bb3414561de3fa67e23361c4267c450ac1a0f8d1dc4949abf532d7b79744d1ef", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "bb3414561de3fa67e23361c4267c450ac1a0f8d1dc4949abf532d7b79744d1ef", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "bb3414561de3fa67e23361c4267c450ac1a0f8d1dc4949abf532d7b79744d1ef", kill_on_drop: false }`
[INFO] [stdout] bb3414561de3fa67e23361c4267c450ac1a0f8d1dc4949abf532d7b79744d1ef
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-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] ff44fb780e75a0f302432c9eb15e6b7a1af2713d0cda0c7ceb95a5cedbdf6c42
[INFO] running `Command { std: "docker" "start" "-a" "ff44fb780e75a0f302432c9eb15e6b7a1af2713d0cda0c7ceb95a5cedbdf6c42", kill_on_drop: false }`
[INFO] [stderr]     Checking static_assertions v1.1.0
[INFO] [stderr]     Checking lexical-util v0.8.5
[INFO] [stderr]     Checking lexical-write-integer v0.8.5
[INFO] [stderr]     Checking lexical-parse-integer v0.8.6
[INFO] [stderr]     Checking lexical-write-float v0.8.5
[INFO] [stderr]     Checking lexical-parse-float v0.8.5
[INFO] [stderr]     Checking lexical-core v0.8.5
[INFO] [stderr]     Checking lexical v6.1.1
[INFO] [stderr]     Checking json-number v0.4.6 (/opt/rustwide/workdir)
[INFO] [stdout] warning: the item `ToOwned` is imported redundantly
[INFO] [stdout]   --> src/lib.rs:19:27
[INFO] [stdout]    |
[INFO] [stdout] 19 | use std::borrow::{Borrow, ToOwned};
[INFO] [stdout]    |                           ^^^^^^^
[INFO] [stdout]   --> /rustc/2d84f2737f3bd9ebfcb07f75aa198d6cf7c715d2/library/std/src/prelude/mod.rs:144:13
[INFO] [stdout]    |
[INFO] [stdout]    = note: the item `ToOwned` is already defined here
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: the item `ToOwned` is imported redundantly
[INFO] [stdout]   --> src/lib.rs:19:27
[INFO] [stdout]    |
[INFO] [stdout] 19 | use std::borrow::{Borrow, ToOwned};
[INFO] [stdout]    |                           ^^^^^^^
[INFO] [stdout]   --> /rustc/2d84f2737f3bd9ebfcb07f75aa198d6cf7c715d2/library/std/src/prelude/mod.rs:144:13
[INFO] [stdout]    |
[INFO] [stdout]    = note: the item `ToOwned` is already defined 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 2.76s
[INFO] running `Command { std: "docker" "inspect" "ff44fb780e75a0f302432c9eb15e6b7a1af2713d0cda0c7ceb95a5cedbdf6c42", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "ff44fb780e75a0f302432c9eb15e6b7a1af2713d0cda0c7ceb95a5cedbdf6c42", kill_on_drop: false }`
[INFO] [stdout] ff44fb780e75a0f302432c9eb15e6b7a1af2713d0cda0c7ceb95a5cedbdf6c42