[INFO] fetching crate easy-xml 0.1.4...
[INFO] checking easy-xml-0.1.4 against master#385fa9d845dd326c6bbfd58c22244215e431948a for absurd-question-mark-desugar
[INFO] extracting crate easy-xml 0.1.4 into /workspace/builds/worker-3-tc1/source
[INFO] validating manifest of crates.io crate easy-xml 0.1.4 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 easy-xml 0.1.4
[INFO] finished tweaking crates.io crate easy-xml 0.1.4
[INFO] tweaked toml for crates.io crate easy-xml 0.1.4 written to /workspace/builds/worker-3-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 7 packages
[INFO] [stderr]       Adding syn v1.0.109 (latest: v2.0.58)
[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 easy-xml-derive v0.1.4
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-3-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-3-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] 01712da0602bdd15ab798691dc2c8ccf71011fcfbf193972a1ac1e5fd24a3515
[INFO] running `Command { std: "docker" "start" "-a" "01712da0602bdd15ab798691dc2c8ccf71011fcfbf193972a1ac1e5fd24a3515", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "01712da0602bdd15ab798691dc2c8ccf71011fcfbf193972a1ac1e5fd24a3515", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "01712da0602bdd15ab798691dc2c8ccf71011fcfbf193972a1ac1e5fd24a3515", kill_on_drop: false }`
[INFO] [stdout] 01712da0602bdd15ab798691dc2c8ccf71011fcfbf193972a1ac1e5fd24a3515
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-3-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-3-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] 7fe9927d451b7717b85e11a3ac1bca7a1bd1b9c168ff6a359f54881bdadb3c9d
[INFO] running `Command { std: "docker" "start" "-a" "7fe9927d451b7717b85e11a3ac1bca7a1bd1b9c168ff6a359f54881bdadb3c9d", kill_on_drop: false }`
[INFO] [stderr]    Compiling syn v1.0.109
[INFO] [stderr]     Checking xml-rs v0.8.20
[INFO] [stderr]    Compiling easy-xml-derive v0.1.4
[INFO] [stderr]     Checking easy-xml v0.1.4 (/opt/rustwide/workdir)
[INFO] [stdout] warning: function cannot return without recursing
[INFO] [stdout]    --> src/lib.rs:294:5
[INFO] [stdout]     |
[INFO] [stdout] 294 | /     fn serialize(&self, element: &mut XmlElement)
[INFO] [stdout] 295 | |     where
[INFO] [stdout] 296 | |         Self: Sized,
[INFO] [stdout]     | |____________________^ cannot return without recursing
[INFO] [stdout] 297 |       {
[INFO] [stdout] 298 |           self.borrow().serialize(element);
[INFO] [stdout]     |           -------------------------------- recursive call site
[INFO] [stdout]     |
[INFO] [stdout]     = help: a `loop` may express intention better if this is on purpose
[INFO] [stdout]     = note: `#[warn(unconditional_recursion)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: call to `.borrow()` on a reference in this situation does nothing
[INFO] [stdout]    --> src/lib.rs:298:13
[INFO] [stdout]     |
[INFO] [stdout] 298 |         self.borrow().serialize(element);
[INFO] [stdout]     |             ^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: the type `Cell<T>` does not implement `Borrow`, so calling `borrow` on `&Cell<T>` copies the reference, which does not do anything and can be removed
[INFO] [stdout]     = note: `#[warn(noop_method_call)]` on by default
[INFO] [stdout] help: remove this redundant call
[INFO] [stdout]     |
[INFO] [stdout] 298 -         self.borrow().serialize(element);
[INFO] [stdout] 298 +         self.serialize(element);
[INFO] [stdout]     |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 2 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function cannot return without recursing
[INFO] [stdout]    --> src/lib.rs:294:5
[INFO] [stdout]     |
[INFO] [stdout] 294 | /     fn serialize(&self, element: &mut XmlElement)
[INFO] [stdout] 295 | |     where
[INFO] [stdout] 296 | |         Self: Sized,
[INFO] [stdout]     | |____________________^ cannot return without recursing
[INFO] [stdout] 297 |       {
[INFO] [stdout] 298 |           self.borrow().serialize(element);
[INFO] [stdout]     |           -------------------------------- recursive call site
[INFO] [stdout]     |
[INFO] [stdout]     = help: a `loop` may express intention better if this is on purpose
[INFO] [stdout]     = note: `#[warn(unconditional_recursion)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: call to `.borrow()` on a reference in this situation does nothing
[INFO] [stdout]    --> src/lib.rs:298:13
[INFO] [stdout]     |
[INFO] [stdout] 298 |         self.borrow().serialize(element);
[INFO] [stdout]     |             ^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: the type `Cell<T>` does not implement `Borrow`, so calling `borrow` on `&Cell<T>` copies the reference, which does not do anything and can be removed
[INFO] [stdout]     = note: `#[warn(noop_method_call)]` on by default
[INFO] [stdout] help: remove this redundant call
[INFO] [stdout]     |
[INFO] [stdout] 298 -         self.borrow().serialize(element);
[INFO] [stdout] 298 +         self.serialize(element);
[INFO] [stdout]     |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 2 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished `dev` profile [unoptimized + debuginfo] target(s) in 4.25s
[INFO] running `Command { std: "docker" "inspect" "7fe9927d451b7717b85e11a3ac1bca7a1bd1b9c168ff6a359f54881bdadb3c9d", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "7fe9927d451b7717b85e11a3ac1bca7a1bd1b9c168ff6a359f54881bdadb3c9d", kill_on_drop: false }`
[INFO] [stdout] 7fe9927d451b7717b85e11a3ac1bca7a1bd1b9c168ff6a359f54881bdadb3c9d
[INFO] checking easy-xml-0.1.4 against try#645bb72776a6a56a1a8f52631a44bd082b2ba509 for absurd-question-mark-desugar
[INFO] extracting crate easy-xml 0.1.4 into /workspace/builds/worker-3-tc2/source
[INFO] validating manifest of crates.io crate easy-xml 0.1.4 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 easy-xml 0.1.4
[INFO] finished tweaking crates.io crate easy-xml 0.1.4
[INFO] tweaked toml for crates.io crate easy-xml 0.1.4 written to /workspace/builds/worker-3-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]     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] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-3-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-3-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] 6d2142999a1d97bcd51568ae6fec4197d29afe43228ea71616376f8df2e9a96c
[INFO] running `Command { std: "docker" "start" "-a" "6d2142999a1d97bcd51568ae6fec4197d29afe43228ea71616376f8df2e9a96c", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "6d2142999a1d97bcd51568ae6fec4197d29afe43228ea71616376f8df2e9a96c", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "6d2142999a1d97bcd51568ae6fec4197d29afe43228ea71616376f8df2e9a96c", kill_on_drop: false }`
[INFO] [stdout] 6d2142999a1d97bcd51568ae6fec4197d29afe43228ea71616376f8df2e9a96c
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-3-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-3-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] 5f68be5a2171d5c8580696f828198cab0523070ed229e5a94c8ed81d9b01f168
[INFO] running `Command { std: "docker" "start" "-a" "5f68be5a2171d5c8580696f828198cab0523070ed229e5a94c8ed81d9b01f168", kill_on_drop: false }`
[INFO] [stderr]     Checking xml-rs v0.8.20
[INFO] [stderr]    Compiling syn v1.0.109
[INFO] [stderr]    Compiling easy-xml-derive v0.1.4
[INFO] [stderr]     Checking easy-xml v0.1.4 (/opt/rustwide/workdir)
[INFO] [stdout] warning: function cannot return without recursing
[INFO] [stdout]    --> src/lib.rs:294:5
[INFO] [stdout]     |
[INFO] [stdout] 294 | /     fn serialize(&self, element: &mut XmlElement)
[INFO] [stdout] 295 | |     where
[INFO] [stdout] 296 | |         Self: Sized,
[INFO] [stdout]     | |____________________^ cannot return without recursing
[INFO] [stdout] 297 |       {
[INFO] [stdout] 298 |           self.borrow().serialize(element);
[INFO] [stdout]     |           -------------------------------- recursive call site
[INFO] [stdout]     |
[INFO] [stdout]     = help: a `loop` may express intention better if this is on purpose
[INFO] [stdout]     = note: `#[warn(unconditional_recursion)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: call to `.borrow()` on a reference in this situation does nothing
[INFO] [stdout]    --> src/lib.rs:298:13
[INFO] [stdout]     |
[INFO] [stdout] 298 |         self.borrow().serialize(element);
[INFO] [stdout]     |             ^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: the type `Cell<T>` does not implement `Borrow`, so calling `borrow` on `&Cell<T>` copies the reference, which does not do anything and can be removed
[INFO] [stdout]     = note: `#[warn(noop_method_call)]` on by default
[INFO] [stdout] help: remove this redundant call
[INFO] [stdout]     |
[INFO] [stdout] 298 -         self.borrow().serialize(element);
[INFO] [stdout] 298 +         self.serialize(element);
[INFO] [stdout]     |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 2 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function cannot return without recursing
[INFO] [stdout]    --> src/lib.rs:294:5
[INFO] [stdout]     |
[INFO] [stdout] 294 | /     fn serialize(&self, element: &mut XmlElement)
[INFO] [stdout] 295 | |     where
[INFO] [stdout] 296 | |         Self: Sized,
[INFO] [stdout]     | |____________________^ cannot return without recursing
[INFO] [stdout] 297 |       {
[INFO] [stdout] 298 |           self.borrow().serialize(element);
[INFO] [stdout]     |           -------------------------------- recursive call site
[INFO] [stdout]     |
[INFO] [stdout]     = help: a `loop` may express intention better if this is on purpose
[INFO] [stdout]     = note: `#[warn(unconditional_recursion)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: call to `.borrow()` on a reference in this situation does nothing
[INFO] [stdout]    --> src/lib.rs:298:13
[INFO] [stdout]     |
[INFO] [stdout] 298 |         self.borrow().serialize(element);
[INFO] [stdout]     |             ^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: the type `Cell<T>` does not implement `Borrow`, so calling `borrow` on `&Cell<T>` copies the reference, which does not do anything and can be removed
[INFO] [stdout]     = note: `#[warn(noop_method_call)]` on by default
[INFO] [stdout] help: remove this redundant call
[INFO] [stdout]     |
[INFO] [stdout] 298 -         self.borrow().serialize(element);
[INFO] [stdout] 298 +         self.serialize(element);
[INFO] [stdout]     |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 2 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished `dev` profile [unoptimized + debuginfo] target(s) in 3.23s
[INFO] running `Command { std: "docker" "inspect" "5f68be5a2171d5c8580696f828198cab0523070ed229e5a94c8ed81d9b01f168", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "5f68be5a2171d5c8580696f828198cab0523070ed229e5a94c8ed81d9b01f168", kill_on_drop: false }`
[INFO] [stdout] 5f68be5a2171d5c8580696f828198cab0523070ed229e5a94c8ed81d9b01f168