[INFO] fetching crate syn-ext 0.4.0...
[INFO] checking syn-ext-0.4.0 against master#22572d0994593197593e2a1b7b18d720a9a349a7 for pr-126452-1
[INFO] extracting crate syn-ext 0.4.0 into /workspace/builds/worker-4-tc1/source
[INFO] validating manifest of crates.io crate syn-ext 0.4.0 on toolchain 22572d0994593197593e2a1b7b18d720a9a349a7
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+22572d0994593197593e2a1b7b18d720a9a349a7" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking crates.io crate syn-ext 0.4.0
[INFO] finished tweaking crates.io crate syn-ext 0.4.0
[INFO] tweaked toml for crates.io crate syn-ext 0.4.0 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" "+22572d0994593197593e2a1b7b18d720a9a349a7" "generate-lockfile" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Updating crates.io index
[INFO] [stderr]      Locking 5 packages to latest compatible versions
[INFO] [stderr]       Adding syn v1.0.109 (latest: v2.0.77)
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+22572d0994593197593e2a1b7b18d720a9a349a7" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[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@sha256:923055f121b5182466d55868a8b05e67af8ba4a3a3f6bad814e953ca3cd3ac2a" "/opt/rustwide/cargo-home/bin/cargo" "+22572d0994593197593e2a1b7b18d720a9a349a7" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] c49f386e98cd9d397fbdc2b5adadcf05701bc9321cbdd520a85653442acc053b
[INFO] running `Command { std: "docker" "start" "-a" "c49f386e98cd9d397fbdc2b5adadcf05701bc9321cbdd520a85653442acc053b", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "c49f386e98cd9d397fbdc2b5adadcf05701bc9321cbdd520a85653442acc053b", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "c49f386e98cd9d397fbdc2b5adadcf05701bc9321cbdd520a85653442acc053b", kill_on_drop: false }`
[INFO] [stdout] c49f386e98cd9d397fbdc2b5adadcf05701bc9321cbdd520a85653442acc053b
[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@sha256:923055f121b5182466d55868a8b05e67af8ba4a3a3f6bad814e953ca3cd3ac2a" "/opt/rustwide/cargo-home/bin/cargo" "+22572d0994593197593e2a1b7b18d720a9a349a7" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 4c1787a61a8eff3b3558cfa6cd46d9d807404aee885519dc2c7a6cd38149cb8b
[INFO] running `Command { std: "docker" "start" "-a" "4c1787a61a8eff3b3558cfa6cd46d9d807404aee885519dc2c7a6cd38149cb8b", kill_on_drop: false }`
[INFO] [stderr]    Compiling proc-macro2 v1.0.86
[INFO] [stderr]     Checking unicode-ident v1.0.12
[INFO] [stderr]    Compiling syn v1.0.109
[INFO] [stderr]     Checking quote v1.0.37
[INFO] [stderr]     Checking syn-ext v0.4.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: associated function `empty_ref` is never used
[INFO] [stdout]  --> src/shared.rs:2:8
[INFO] [stdout]   |
[INFO] [stdout] 1 | pub trait SharedEmpty {
[INFO] [stdout]   |           ----------- associated function in this trait
[INFO] [stdout] 2 |     fn empty_ref() -> &'static Self;
[INFO] [stdout]   |        ^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 1 warning emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function `empty_ref` is never used
[INFO] [stdout]  --> src/shared.rs:2:8
[INFO] [stdout]   |
[INFO] [stdout] 1 | pub trait SharedEmpty {
[INFO] [stdout]   |           ----------- associated function in this trait
[INFO] [stdout] 2 |     fn empty_ref() -> &'static Self;
[INFO] [stdout]   |        ^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 1 warning emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished `dev` profile [unoptimized + debuginfo] target(s) in 2.56s
[INFO] running `Command { std: "docker" "inspect" "4c1787a61a8eff3b3558cfa6cd46d9d807404aee885519dc2c7a6cd38149cb8b", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "4c1787a61a8eff3b3558cfa6cd46d9d807404aee885519dc2c7a6cd38149cb8b", kill_on_drop: false }`
[INFO] [stdout] 4c1787a61a8eff3b3558cfa6cd46d9d807404aee885519dc2c7a6cd38149cb8b
[INFO] checking syn-ext-0.4.0 against try#6289438dbad80b1a0029c66dd3f6abf57c2c51be for pr-126452-1
[INFO] extracting crate syn-ext 0.4.0 into /workspace/builds/worker-4-tc2/source
[INFO] validating manifest of crates.io crate syn-ext 0.4.0 on toolchain 6289438dbad80b1a0029c66dd3f6abf57c2c51be
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+6289438dbad80b1a0029c66dd3f6abf57c2c51be" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking crates.io crate syn-ext 0.4.0
[INFO] finished tweaking crates.io crate syn-ext 0.4.0
[INFO] tweaked toml for crates.io crate syn-ext 0.4.0 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" "+6289438dbad80b1a0029c66dd3f6abf57c2c51be" "generate-lockfile" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Updating crates.io index
[INFO] [stderr]      Locking 5 packages to latest compatible versions
[INFO] [stderr]       Adding syn v1.0.109 (latest: v2.0.77)
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+6289438dbad80b1a0029c66dd3f6abf57c2c51be" "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@sha256:923055f121b5182466d55868a8b05e67af8ba4a3a3f6bad814e953ca3cd3ac2a" "/opt/rustwide/cargo-home/bin/cargo" "+6289438dbad80b1a0029c66dd3f6abf57c2c51be" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 329c681c1ee76b16f71eef5de15432ae982858f4dd426642d7fd0d5be8cd2bb9
[INFO] running `Command { std: "docker" "start" "-a" "329c681c1ee76b16f71eef5de15432ae982858f4dd426642d7fd0d5be8cd2bb9", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "329c681c1ee76b16f71eef5de15432ae982858f4dd426642d7fd0d5be8cd2bb9", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "329c681c1ee76b16f71eef5de15432ae982858f4dd426642d7fd0d5be8cd2bb9", kill_on_drop: false }`
[INFO] [stdout] 329c681c1ee76b16f71eef5de15432ae982858f4dd426642d7fd0d5be8cd2bb9
[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@sha256:923055f121b5182466d55868a8b05e67af8ba4a3a3f6bad814e953ca3cd3ac2a" "/opt/rustwide/cargo-home/bin/cargo" "+6289438dbad80b1a0029c66dd3f6abf57c2c51be" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 11b352cd2ff999f6caed2e421e84730ebecaad4addefcb2083bc7b52b5baccdd
[INFO] running `Command { std: "docker" "start" "-a" "11b352cd2ff999f6caed2e421e84730ebecaad4addefcb2083bc7b52b5baccdd", kill_on_drop: false }`
[INFO] [stderr]    Compiling proc-macro2 v1.0.86
[INFO] [stderr]     Checking unicode-ident v1.0.12
[INFO] [stderr]    Compiling syn v1.0.109
[INFO] [stderr]     Checking quote v1.0.37
[INFO] [stderr]     Checking syn-ext v0.4.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: associated function `empty_ref` is never used
[INFO] [stdout]  --> src/shared.rs:2:8
[INFO] [stdout]   |
[INFO] [stdout] 1 | pub trait SharedEmpty {
[INFO] [stdout]   |           ----------- associated function in this trait
[INFO] [stdout] 2 |     fn empty_ref() -> &'static Self;
[INFO] [stdout]   |        ^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function `empty_ref` is never used
[INFO] [stdout]  --> src/shared.rs:2:8
[INFO] [stdout]   |
[INFO] [stdout] 1 | pub trait SharedEmpty {
[INFO] [stdout]   |           ----------- associated function in this trait
[INFO] [stdout] 2 |     fn empty_ref() -> &'static Self;
[INFO] [stdout]   |        ^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(dead_code)]` 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 2.01s
[INFO] running `Command { std: "docker" "inspect" "11b352cd2ff999f6caed2e421e84730ebecaad4addefcb2083bc7b52b5baccdd", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "11b352cd2ff999f6caed2e421e84730ebecaad4addefcb2083bc7b52b5baccdd", kill_on_drop: false }`
[INFO] [stdout] 11b352cd2ff999f6caed2e421e84730ebecaad4addefcb2083bc7b52b5baccdd