[INFO] fetching crate json_proc_macro 0.5.1...
[INFO] checking json_proc_macro-0.5.1 against try#012cd62c9add58ab3910e44c137d87db3ab70f61 for pr-155915
[INFO] extracting crate json_proc_macro 0.5.1 into /workspace/builds/worker-6-tc2/source
[INFO] started tweaking crates.io crate json_proc_macro 0.5.1
[INFO] finished tweaking crates.io crate json_proc_macro 0.5.1
[INFO] tweaked toml for crates.io crate json_proc_macro 0.5.1 written to /workspace/builds/worker-6-tc2/source/Cargo.toml
[INFO] validating manifest of crates.io crate json_proc_macro 0.5.1 on toolchain 012cd62c9add58ab3910e44c137d87db3ab70f61
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+012cd62c9add58ab3910e44c137d87db3ab70f61" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] crate crates.io crate json_proc_macro 0.5.1 already has a lockfile, it will not be regenerated
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+012cd62c9add58ab3910e44c137d87db3ab70f61" "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:d429b63d4308055ea97f60fb1d3dfca48854a00942f1bd2ad806beaf015945ec" "/opt/rustwide/cargo-home/bin/cargo" "+012cd62c9add58ab3910e44c137d87db3ab70f61" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 53ebab3a6c50ec78200ac568cec437a04972273021d43767dc11e80e75042bd1
[INFO] running `Command { std: "docker" "start" "-a" "53ebab3a6c50ec78200ac568cec437a04972273021d43767dc11e80e75042bd1", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "53ebab3a6c50ec78200ac568cec437a04972273021d43767dc11e80e75042bd1", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "53ebab3a6c50ec78200ac568cec437a04972273021d43767dc11e80e75042bd1", kill_on_drop: false }`
[INFO] [stdout] 53ebab3a6c50ec78200ac568cec437a04972273021d43767dc11e80e75042bd1
[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:d429b63d4308055ea97f60fb1d3dfca48854a00942f1bd2ad806beaf015945ec" "/opt/rustwide/cargo-home/bin/cargo" "+012cd62c9add58ab3910e44c137d87db3ab70f61" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] d0affcb04ea50e9b9f1170892d8ea20eeee0b391937b2a77dc844af8ff7dc644
[INFO] running `Command { std: "docker" "start" "-a" "d0affcb04ea50e9b9f1170892d8ea20eeee0b391937b2a77dc844af8ff7dc644", kill_on_drop: false }`
[INFO] [stderr]    Compiling semver v1.0.23
[INFO] [stderr]    Compiling proc-macro2 v1.0.87
[INFO] [stderr]     Checking unicode-ident v1.0.13
[INFO] [stderr]    Compiling rustc_version v0.4.1
[INFO] [stderr]    Compiling json_proc_macro v0.5.1 (/opt/rustwide/workdir)
[INFO] [stderr]     Checking quote v1.0.37
[INFO] [stderr]     Checking syn v2.0.86
[INFO] [stdout] warning: feature `negative_impls` is declared but not used
[INFO] [stdout]  --> src/lib.rs:1:68
[INFO] [stdout]   |
[INFO] [stdout] 1 | #![cfg_attr(lints_enabled, feature(proc_macro_diagnostic), feature(negative_impls))]
[INFO] [stdout]   |                                                                    ^^^^^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_features)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished `dev` profile [unoptimized + debuginfo] target(s) in 3.98s
[INFO] [stdout] warning: feature `negative_impls` is declared but not used
[INFO] [stdout]  --> src/lib.rs:1:68
[INFO] [stdout]   |
[INFO] [stdout] 1 | #![cfg_attr(lints_enabled, feature(proc_macro_diagnostic), feature(negative_impls))]
[INFO] [stdout]   |                                                                    ^^^^^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_features)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] running `Command { std: "docker" "inspect" "d0affcb04ea50e9b9f1170892d8ea20eeee0b391937b2a77dc844af8ff7dc644", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "d0affcb04ea50e9b9f1170892d8ea20eeee0b391937b2a77dc844af8ff7dc644", kill_on_drop: false }`
[INFO] [stdout] d0affcb04ea50e9b9f1170892d8ea20eeee0b391937b2a77dc844af8ff7dc644