[INFO] fetching crate serde_version_derive 0.5.1...
[INFO] checking serde_version_derive-0.5.1 against master#385fa9d845dd326c6bbfd58c22244215e431948a for absurd-question-mark-desugar
[INFO] extracting crate serde_version_derive 0.5.1 into /workspace/builds/worker-2-tc1/source
[INFO] validating manifest of crates.io crate serde_version_derive 0.5.1 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 serde_version_derive 0.5.1
[INFO] finished tweaking crates.io crate serde_version_derive 0.5.1
[INFO] tweaked toml for crates.io crate serde_version_derive 0.5.1 written to /workspace/builds/worker-2-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 21 packages
[INFO] [stderr]       Adding object v0.32.2 (latest: v0.34.0)
[INFO] [stderr]       Adding syn v1.0.109 (latest: v2.0.58)
[INFO] [stderr]       Adding synstructure v0.12.6 (latest: v0.13.1)
[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 proc-macro-util v0.1.1
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-2-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-2-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] 4324c39a0cde02b7b6b41d717ced3dfb8cec090d96be94bdbd03a85338b1918d
[INFO] running `Command { std: "docker" "start" "-a" "4324c39a0cde02b7b6b41d717ced3dfb8cec090d96be94bdbd03a85338b1918d", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "4324c39a0cde02b7b6b41d717ced3dfb8cec090d96be94bdbd03a85338b1918d", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "4324c39a0cde02b7b6b41d717ced3dfb8cec090d96be94bdbd03a85338b1918d", kill_on_drop: false }`
[INFO] [stdout] 4324c39a0cde02b7b6b41d717ced3dfb8cec090d96be94bdbd03a85338b1918d
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-2-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-2-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] 26584e69dcf3dfe21d8fa69672766c3834d340d481481430553c7c090ce414b0
[INFO] running `Command { std: "docker" "start" "-a" "26584e69dcf3dfe21d8fa69672766c3834d340d481481430553c7c090ce414b0", kill_on_drop: false }`
[INFO] [stderr]    Compiling syn v1.0.109
[INFO] [stderr]    Compiling cc v1.0.90
[INFO] [stderr]    Compiling libc v0.2.153
[INFO] [stderr]     Checking adler v1.0.2
[INFO] [stderr]    Compiling unicode-xid v0.2.4
[INFO] [stderr]     Checking unicode-ident v1.0.12
[INFO] [stderr]     Checking gimli v0.28.1
[INFO] [stderr]     Checking memchr v2.7.2
[INFO] [stderr]    Compiling failure_derive v0.1.8
[INFO] [stderr]     Checking proc-macro2 v1.0.79
[INFO] [stderr]     Checking miniz_oxide v0.7.2
[INFO] [stderr]     Checking rustc-demangle v0.1.23
[INFO] [stderr]     Checking cfg-if v1.0.0
[INFO] [stderr]     Checking quote v1.0.35
[INFO] [stderr]     Checking object v0.32.2
[INFO] [stderr]    Compiling backtrace v0.3.71
[INFO] [stderr]    Compiling synstructure v0.12.6
[INFO] [stderr]     Checking addr2line v0.21.0
[INFO] [stderr]     Checking failure v0.1.8
[INFO] [stderr]     Checking proc-macro-util v0.1.1
[INFO] [stderr]     Checking serde_version_derive v0.5.1 (/opt/rustwide/workdir)
[INFO] [stdout] warning: field `index` is never read
[INFO] [stdout]    --> src/ast.rs:216:13
[INFO] [stdout]     |
[INFO] [stdout] 214 |     pub struct Version {
[INFO] [stdout]     |                ------- field in this struct
[INFO] [stdout] 215 |         pub path: PathOrSelf,
[INFO] [stdout] 216 |         pub index: usize,
[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: fields `index` and `is_default` are never read
[INFO] [stdout]    --> src/ast.rs:216:13
[INFO] [stdout]     |
[INFO] [stdout] 214 |     pub struct Version {
[INFO] [stdout]     |                ------- fields in this struct
[INFO] [stdout] 215 |         pub path: PathOrSelf,
[INFO] [stdout] 216 |         pub index: usize,
[INFO] [stdout]     |             ^^^^^
[INFO] [stdout] 217 |         pub is_default: bool,
[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 18.24s
[INFO] running `Command { std: "docker" "inspect" "26584e69dcf3dfe21d8fa69672766c3834d340d481481430553c7c090ce414b0", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "26584e69dcf3dfe21d8fa69672766c3834d340d481481430553c7c090ce414b0", kill_on_drop: false }`
[INFO] [stdout] 26584e69dcf3dfe21d8fa69672766c3834d340d481481430553c7c090ce414b0
[INFO] checking serde_version_derive-0.5.1 against try#645bb72776a6a56a1a8f52631a44bd082b2ba509 for absurd-question-mark-desugar
[INFO] extracting crate serde_version_derive 0.5.1 into /workspace/builds/worker-2-tc2/source
[INFO] validating manifest of crates.io crate serde_version_derive 0.5.1 on toolchain 645bb72776a6a56a1a8f52631a44bd082b2ba509
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+645bb72776a6a56a1a8f52631a44bd082b2ba509" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking crates.io crate serde_version_derive 0.5.1
[INFO] finished tweaking crates.io crate serde_version_derive 0.5.1
[INFO] tweaked toml for crates.io crate serde_version_derive 0.5.1 written to /workspace/builds/worker-2-tc2/source/Cargo.toml
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+645bb72776a6a56a1a8f52631a44bd082b2ba509" "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] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+645bb72776a6a56a1a8f52631a44bd082b2ba509" "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-2-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-2-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" "+645bb72776a6a56a1a8f52631a44bd082b2ba509" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 770d8cc2e1a1e23e7c35e70cac12be7e518f44e03b749c4745a832c9001ebc19
[INFO] running `Command { std: "docker" "start" "-a" "770d8cc2e1a1e23e7c35e70cac12be7e518f44e03b749c4745a832c9001ebc19", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "770d8cc2e1a1e23e7c35e70cac12be7e518f44e03b749c4745a832c9001ebc19", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "770d8cc2e1a1e23e7c35e70cac12be7e518f44e03b749c4745a832c9001ebc19", kill_on_drop: false }`
[INFO] [stdout] 770d8cc2e1a1e23e7c35e70cac12be7e518f44e03b749c4745a832c9001ebc19
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-2-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-2-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" "+645bb72776a6a56a1a8f52631a44bd082b2ba509" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] b0a0a14134fbcf7fa2ca94e63dddf45944d671b93639a4fd2c5cba85c0aa58ed
[INFO] running `Command { std: "docker" "start" "-a" "b0a0a14134fbcf7fa2ca94e63dddf45944d671b93639a4fd2c5cba85c0aa58ed", kill_on_drop: false }`
[INFO] [stderr]    Compiling syn v1.0.109
[INFO] [stderr]    Compiling libc v0.2.153
[INFO] [stderr]    Compiling cc v1.0.90
[INFO] [stderr]     Checking gimli v0.28.1
[INFO] [stderr]    Compiling unicode-xid v0.2.4
[INFO] [stderr]     Checking adler v1.0.2
[INFO] [stderr]     Checking memchr v2.7.2
[INFO] [stderr]     Checking unicode-ident v1.0.12
[INFO] [stderr]    Compiling failure_derive v0.1.8
[INFO] [stderr]     Checking proc-macro2 v1.0.79
[INFO] [stderr]     Checking miniz_oxide v0.7.2
[INFO] [stderr]     Checking cfg-if v1.0.0
[INFO] [stderr]     Checking rustc-demangle v0.1.23
[INFO] [stderr]     Checking quote v1.0.35
[INFO] [stderr]     Checking object v0.32.2
[INFO] [stderr]    Compiling backtrace v0.3.71
[INFO] [stderr]     Checking addr2line v0.21.0
[INFO] [stderr]    Compiling synstructure v0.12.6
[INFO] [stderr]     Checking failure v0.1.8
[INFO] [stderr]     Checking proc-macro-util v0.1.1
[INFO] [stderr]     Checking serde_version_derive v0.5.1 (/opt/rustwide/workdir)
[INFO] [stdout] warning: field `index` is never read
[INFO] [stdout]    --> src/ast.rs:216:13
[INFO] [stdout]     |
[INFO] [stdout] 214 |     pub struct Version {
[INFO] [stdout]     |                ------- field in this struct
[INFO] [stdout] 215 |         pub path: PathOrSelf,
[INFO] [stdout] 216 |         pub index: usize,
[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: fields `index` and `is_default` are never read
[INFO] [stdout]    --> src/ast.rs:216:13
[INFO] [stdout]     |
[INFO] [stdout] 214 |     pub struct Version {
[INFO] [stdout]     |                ------- fields in this struct
[INFO] [stdout] 215 |         pub path: PathOrSelf,
[INFO] [stdout] 216 |         pub index: usize,
[INFO] [stdout]     |             ^^^^^
[INFO] [stdout] 217 |         pub is_default: bool,
[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 17.49s
[INFO] running `Command { std: "docker" "inspect" "b0a0a14134fbcf7fa2ca94e63dddf45944d671b93639a4fd2c5cba85c0aa58ed", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "b0a0a14134fbcf7fa2ca94e63dddf45944d671b93639a4fd2c5cba85c0aa58ed", kill_on_drop: false }`
[INFO] [stdout] b0a0a14134fbcf7fa2ca94e63dddf45944d671b93639a4fd2c5cba85c0aa58ed