[INFO] fetching crate strict-yaml-rust 0.1.2...
[INFO] checking strict-yaml-rust-0.1.2 against master#385fa9d845dd326c6bbfd58c22244215e431948a for absurd-question-mark-desugar
[INFO] extracting crate strict-yaml-rust 0.1.2 into /workspace/builds/worker-1-tc1/source
[INFO] validating manifest of crates.io crate strict-yaml-rust 0.1.2 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 strict-yaml-rust 0.1.2
[INFO] finished tweaking crates.io crate strict-yaml-rust 0.1.2
[INFO] tweaked toml for crates.io crate strict-yaml-rust 0.1.2 written to /workspace/builds/worker-1-tc1/source/Cargo.toml
[INFO] crate crates.io crate strict-yaml-rust 0.1.2 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" "+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 quickcheck v0.9.2
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-1-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-1-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] 1f09f5853fc15509a01252b9d350b9c51a4eac5278ad05df200219aa475f8e90
[INFO] running `Command { std: "docker" "start" "-a" "1f09f5853fc15509a01252b9d350b9c51a4eac5278ad05df200219aa475f8e90", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "1f09f5853fc15509a01252b9d350b9c51a4eac5278ad05df200219aa475f8e90", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "1f09f5853fc15509a01252b9d350b9c51a4eac5278ad05df200219aa475f8e90", kill_on_drop: false }`
[INFO] [stdout] 1f09f5853fc15509a01252b9d350b9c51a4eac5278ad05df200219aa475f8e90
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-1-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-1-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] c33c2f1491b98b9890cde8173514a391a37d24f65c673cf9ae07e5b70492403b
[INFO] running `Command { std: "docker" "start" "-a" "c33c2f1491b98b9890cde8173514a391a37d24f65c673cf9ae07e5b70492403b", kill_on_drop: false }`
[INFO] [stderr]    Compiling libc v0.2.126
[INFO] [stderr]    Compiling log v0.4.17
[INFO] [stderr]     Checking ppv-lite86 v0.2.16
[INFO] [stderr]     Checking regex-syntax v0.6.26
[INFO] [stderr]     Checking linked-hash-map v0.5.4
[INFO] [stderr]     Checking aho-corasick v0.7.18
[INFO] [stderr]     Checking strict-yaml-rust v0.1.2 (/opt/rustwide/workdir)
[INFO] [stdout] warning: the item `From` is imported redundantly
[INFO] [stdout]  --> src/emitter.rs:1:5
[INFO] [stdout]   |
[INFO] [stdout] 1 | use std::convert::From;
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^^^^
[INFO] [stdout]  --> /rustc/385fa9d845dd326c6bbfd58c22244215e431948a/library/std/src/prelude/mod.rs:124:13
[INFO] [stdout]   |
[INFO] [stdout]   = note: the item `From` is already defined here
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: fields `marks` and `anchor_id` are never read
[INFO] [stdout]   --> src/parser.rs:56:5
[INFO] [stdout]    |
[INFO] [stdout] 51 | pub struct Parser<T> {
[INFO] [stdout]    |            ------ fields in this struct
[INFO] [stdout] ...
[INFO] [stdout] 56 |     marks: Vec<Marker>,
[INFO] [stdout]    |     ^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 62 |     anchor_id: usize,
[INFO] [stdout]    |     ^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `Parser` has a derived impl for the trait `Debug`, but this is intentionally ignored during dead code analysis
[INFO] [stdout]    = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 2 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Checking getrandom v0.1.16
[INFO] [stderr]     Checking rand_core v0.5.1
[INFO] [stderr]     Checking rand_chacha v0.2.2
[INFO] [stderr]     Checking rand v0.7.3
[INFO] [stderr]     Checking regex v1.5.6
[INFO] [stderr]     Checking env_logger v0.7.1
[INFO] [stderr]     Checking quickcheck v0.9.2
[INFO] [stdout] warning: the item `From` is imported redundantly
[INFO] [stdout]  --> src/emitter.rs:1:5
[INFO] [stdout]   |
[INFO] [stdout] 1 | use std::convert::From;
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^^^^
[INFO] [stdout]  --> /rustc/385fa9d845dd326c6bbfd58c22244215e431948a/library/std/src/prelude/mod.rs:124:13
[INFO] [stdout]   |
[INFO] [stdout]   = note: the item `From` is already defined here
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: fields `marks` and `anchor_id` are never read
[INFO] [stdout]   --> src/parser.rs:56:5
[INFO] [stdout]    |
[INFO] [stdout] 51 | pub struct Parser<T> {
[INFO] [stdout]    |            ------ fields in this struct
[INFO] [stdout] ...
[INFO] [stdout] 56 |     marks: Vec<Marker>,
[INFO] [stdout]    |     ^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 62 |     anchor_id: usize,
[INFO] [stdout]    |     ^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `Parser` has a derived impl for the trait `Debug`, but this is intentionally ignored during dead code analysis
[INFO] [stdout]    = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 2 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished `dev` profile [unoptimized + debuginfo] target(s) in 7.61s
[INFO] running `Command { std: "docker" "inspect" "c33c2f1491b98b9890cde8173514a391a37d24f65c673cf9ae07e5b70492403b", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "c33c2f1491b98b9890cde8173514a391a37d24f65c673cf9ae07e5b70492403b", kill_on_drop: false }`
[INFO] [stdout] c33c2f1491b98b9890cde8173514a391a37d24f65c673cf9ae07e5b70492403b
[INFO] checking strict-yaml-rust-0.1.2 against try#645bb72776a6a56a1a8f52631a44bd082b2ba509 for absurd-question-mark-desugar
[INFO] extracting crate strict-yaml-rust 0.1.2 into /workspace/builds/worker-1-tc2/source
[INFO] validating manifest of crates.io crate strict-yaml-rust 0.1.2 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 strict-yaml-rust 0.1.2
[INFO] finished tweaking crates.io crate strict-yaml-rust 0.1.2
[INFO] tweaked toml for crates.io crate strict-yaml-rust 0.1.2 written to /workspace/builds/worker-1-tc2/source/Cargo.toml
[INFO] crate crates.io crate strict-yaml-rust 0.1.2 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" "+645bb72776a6a56a1a8f52631a44bd082b2ba509" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-1-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-1-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] ebd7f1f3582da0827c0e9303ede88a862a00694274fbca818013375215d54a9c
[INFO] running `Command { std: "docker" "start" "-a" "ebd7f1f3582da0827c0e9303ede88a862a00694274fbca818013375215d54a9c", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "ebd7f1f3582da0827c0e9303ede88a862a00694274fbca818013375215d54a9c", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "ebd7f1f3582da0827c0e9303ede88a862a00694274fbca818013375215d54a9c", kill_on_drop: false }`
[INFO] [stdout] ebd7f1f3582da0827c0e9303ede88a862a00694274fbca818013375215d54a9c
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-1-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-1-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] a6e6057fe5dc66a6f25c06f49558f387ee6442cd125cd5ed6062fa9a1d88b30e
[INFO] running `Command { std: "docker" "start" "-a" "a6e6057fe5dc66a6f25c06f49558f387ee6442cd125cd5ed6062fa9a1d88b30e", kill_on_drop: false }`
[INFO] [stderr]    Compiling libc v0.2.126
[INFO] [stderr]    Compiling log v0.4.17
[INFO] [stderr]     Checking regex-syntax v0.6.26
[INFO] [stderr]     Checking ppv-lite86 v0.2.16
[INFO] [stderr]     Checking linked-hash-map v0.5.4
[INFO] [stderr]     Checking aho-corasick v0.7.18
[INFO] [stderr]     Checking strict-yaml-rust v0.1.2 (/opt/rustwide/workdir)
[INFO] [stdout] warning: the item `From` is imported redundantly
[INFO] [stdout]  --> src/emitter.rs:1:5
[INFO] [stdout]   |
[INFO] [stdout] 1 | use std::convert::From;
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^^^^
[INFO] [stdout]  --> /rustc/645bb72776a6a56a1a8f52631a44bd082b2ba509/library/std/src/prelude/mod.rs:124:13
[INFO] [stdout]   |
[INFO] [stdout]   = note: the item `From` is already defined here
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: fields `marks` and `anchor_id` are never read
[INFO] [stdout]   --> src/parser.rs:56:5
[INFO] [stdout]    |
[INFO] [stdout] 51 | pub struct Parser<T> {
[INFO] [stdout]    |            ------ fields in this struct
[INFO] [stdout] ...
[INFO] [stdout] 56 |     marks: Vec<Marker>,
[INFO] [stdout]    |     ^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 62 |     anchor_id: usize,
[INFO] [stdout]    |     ^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `Parser` has a derived impl for the trait `Debug`, but this is intentionally ignored during dead code analysis
[INFO] [stdout]    = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 2 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Checking getrandom v0.1.16
[INFO] [stderr]     Checking rand_core v0.5.1
[INFO] [stderr]     Checking rand_chacha v0.2.2
[INFO] [stderr]     Checking rand v0.7.3
[INFO] [stderr]     Checking regex v1.5.6
[INFO] [stderr]     Checking env_logger v0.7.1
[INFO] [stderr]     Checking quickcheck v0.9.2
[INFO] [stdout] warning: the item `From` is imported redundantly
[INFO] [stdout]  --> src/emitter.rs:1:5
[INFO] [stdout]   |
[INFO] [stdout] 1 | use std::convert::From;
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^^^^
[INFO] [stdout]  --> /rustc/645bb72776a6a56a1a8f52631a44bd082b2ba509/library/std/src/prelude/mod.rs:124:13
[INFO] [stdout]   |
[INFO] [stdout]   = note: the item `From` is already defined here
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: fields `marks` and `anchor_id` are never read
[INFO] [stdout]   --> src/parser.rs:56:5
[INFO] [stdout]    |
[INFO] [stdout] 51 | pub struct Parser<T> {
[INFO] [stdout]    |            ------ fields in this struct
[INFO] [stdout] ...
[INFO] [stdout] 56 |     marks: Vec<Marker>,
[INFO] [stdout]    |     ^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 62 |     anchor_id: usize,
[INFO] [stdout]    |     ^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `Parser` has a derived impl for the trait `Debug`, but this is intentionally ignored during dead code analysis
[INFO] [stdout]    = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 2 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished `dev` profile [unoptimized + debuginfo] target(s) in 8.06s
[INFO] running `Command { std: "docker" "inspect" "a6e6057fe5dc66a6f25c06f49558f387ee6442cd125cd5ed6062fa9a1d88b30e", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "a6e6057fe5dc66a6f25c06f49558f387ee6442cd125cd5ed6062fa9a1d88b30e", kill_on_drop: false }`
[INFO] [stdout] a6e6057fe5dc66a6f25c06f49558f387ee6442cd125cd5ed6062fa9a1d88b30e