[INFO] fetching crate daab 0.4.0...
[INFO] checking daab-0.4.0 against master#385fa9d845dd326c6bbfd58c22244215e431948a for absurd-question-mark-desugar
[INFO] extracting crate daab 0.4.0 into /workspace/builds/worker-2-tc1/source
[INFO] validating manifest of crates.io crate daab 0.4.0 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 daab 0.4.0
[INFO] finished tweaking crates.io crate daab 0.4.0
[INFO] tweaked toml for crates.io crate daab 0.4.0 written to /workspace/builds/worker-2-tc1/source/Cargo.toml
[INFO] crate crates.io crate daab 0.4.0 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]     Updating crates.io index
[INFO] [stderr]  Downloading crates ...
[INFO] [stderr]   Downloaded quote v1.0.7
[INFO] [stderr]   Downloaded ctor v0.1.16
[INFO] [stderr]   Downloaded never v0.1.0
[INFO] [stderr]   Downloaded tynm v0.1.4
[INFO] [stderr]   Downloaded syn v1.0.48
[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] 503631a8e1a449731e7d7510fb081d94ae220d75b3221e1b485477607dd002b9
[INFO] running `Command { std: "docker" "start" "-a" "503631a8e1a449731e7d7510fb081d94ae220d75b3221e1b485477607dd002b9", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "503631a8e1a449731e7d7510fb081d94ae220d75b3221e1b485477607dd002b9", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "503631a8e1a449731e7d7510fb081d94ae220d75b3221e1b485477607dd002b9", kill_on_drop: false }`
[INFO] [stdout] 503631a8e1a449731e7d7510fb081d94ae220d75b3221e1b485477607dd002b9
[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] ce813d8f42655d4f9c17cc73d6c97eca153690d180fa5fa5d1102956eed52502
[INFO] running `Command { std: "docker" "start" "-a" "ce813d8f42655d4f9c17cc73d6c97eca153690d180fa5fa5d1102956eed52502", kill_on_drop: false }`
[INFO] [stderr]    Compiling memchr v2.3.3
[INFO] [stderr]     Checking never v0.1.0
[INFO] [stderr]     Checking regex-syntax v0.6.18
[INFO] [stderr]     Checking difference v2.0.0
[INFO] [stderr]     Checking thread_local v1.0.1
[INFO] [stderr]     Checking pretty_assertions v0.6.1
[INFO] [stderr]     Checking daab v0.4.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: method `builder_ptr` is never used
[INFO] [stdout]    --> src/blueprint.rs:167:16
[INFO] [stdout]     |
[INFO] [stdout] 150 | impl<B, BCan: Can<B>> Blueprint<B, BCan> {
[INFO] [stdout]     | ---------------------------------------- method in this implementation
[INFO] [stdout] ...
[INFO] [stdout] 167 |     pub(crate) fn builder_ptr(&self) -> *const () {
[INFO] [stdout]     |                   ^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: type alias `BuilderDyn` is never used
[INFO] [stdout]    --> src/blueprint.rs:562:6
[INFO] [stdout]     |
[INFO] [stdout] 562 | type BuilderDyn<ArtCan, BCan, Artifact, Err, DynState> = dyn Builder<ArtCan, BCan, Artifact=Artifact, Err=Err, DynState=DynState>;
[INFO] [stdout]     |      ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: method `builder_ptr` is never used
[INFO] [stdout]    --> src/blueprint.rs:674:16
[INFO] [stdout]     |
[INFO] [stdout] 654 | / impl<ArtCan, BCan, Art, Err, DynSt> BlueprintDyn<ArtCan, BCan, Art, Err, DynSt>
[INFO] [stdout] 655 | |     where
[INFO] [stdout] 656 | |         BCan: Can<dyn Builder<ArtCan, BCan, Artifact=Art, Err=Err, DynState=DynSt>>, {
[INFO] [stdout]     | |____________________________________________________________________________________- method in this implementation
[INFO] [stdout] ...
[INFO] [stdout] 674 |       pub(crate) fn builder_ptr(&self) -> *const () {
[INFO] [stdout]     |                     ^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: methods `lookup_mut`, `get_mut`, and `invalidate_dependents` are never used
[INFO] [stdout]    --> src/cache/internal.rs:367:16
[INFO] [stdout]     |
[INFO] [stdout] 219 | / impl<ArtCan, BCan> RawCache<ArtCan, BCan>
[INFO] [stdout] 220 | |         where
[INFO] [stdout] 221 | |             ArtCan: Debug,
[INFO] [stdout] 222 | |             BCan: CanStrong {
[INFO] [stdout]     | |___________________________- methods in this implementation
[INFO] [stdout] ...
[INFO] [stdout] 367 |       pub(crate) fn lookup_mut<AP, B: ?Sized>(
[INFO] [stdout]     |                     ^^^^^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 555 |       pub(crate) fn get_mut<AP, B: ?Sized>(
[INFO] [stdout]     |                     ^^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 850 |       fn invalidate_dependents(&mut self, builder: &BuilderId) {
[INFO] [stdout]     |          ^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: missing documentation for a type alias
[INFO] [stdout]   --> src/rc.rs:57:1
[INFO] [stdout]    |
[INFO] [stdout] 57 | pub type ConstBuilder<T> = crate::utils::ConstBuilder<CanType, BuilderCan, BinType<T>, T>;
[INFO] [stdout]    | ^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout] note: the lint level is defined here
[INFO] [stdout]   --> src/lib.rs:20:9
[INFO] [stdout]    |
[INFO] [stdout] 20 | #![warn(missing_docs)]
[INFO] [stdout]    |         ^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: missing documentation for a type alias
[INFO] [stdout]   --> src/rc.rs:58:1
[INFO] [stdout]    |
[INFO] [stdout] 58 | pub type ConfigurableBuilder<T> = crate::utils::ConfigurableBuilder<CanType, BuilderCan, T>;
[INFO] [stdout]    | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: missing documentation for a type alias
[INFO] [stdout]   --> src/arc.rs:57:1
[INFO] [stdout]    |
[INFO] [stdout] 57 | pub type ConstBuilder<T> = crate::utils::ConstBuilder<CanType, BuilderCan, BinType<T>, T>;
[INFO] [stdout]    | ^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: missing documentation for a type alias
[INFO] [stdout]   --> src/arc.rs:58:1
[INFO] [stdout]    |
[INFO] [stdout] 58 | pub type ConfigurableBuilder<T> = crate::utils::ConfigurableBuilder<CanType, BuilderCan, T>;
[INFO] [stdout]    | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: missing documentation for a type alias
[INFO] [stdout]   --> src/boxed.rs:59:1
[INFO] [stdout]    |
[INFO] [stdout] 59 | pub type ConstBuilder<T> = crate::utils::ConstBuilder<CanType, BuilderCan, BinType<T>, T>;
[INFO] [stdout]    | ^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: missing documentation for a type alias
[INFO] [stdout]   --> src/boxed.rs:60:1
[INFO] [stdout]    |
[INFO] [stdout] 60 | pub type ConfigurableBuilder<T> = crate::utils::ConfigurableBuilder<CanType, BuilderCan, T>;
[INFO] [stdout]    | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: missing documentation for an associated type
[INFO] [stdout]   --> src/blueprint.rs:80:2
[INFO] [stdout]    |
[INFO] [stdout] 80 |     type Builder: ?Sized + 'static + Debug;
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: missing documentation for an associated type
[INFO] [stdout]   --> src/blueprint.rs:81:2
[INFO] [stdout]    |
[INFO] [stdout] 81 |     type BCan: Can<Self::Builder>;
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 12 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Checking aho-corasick v0.7.13
[INFO] [stderr]     Checking regex v1.3.9
[INFO] [stdout] warning: fields `foo_artifact` and `baz_artifact` are never read
[INFO] [stdout]   --> examples/boxed_result_cloned.rs:19:2
[INFO] [stdout]    |
[INFO] [stdout] 18 | struct BarArtifact {
[INFO] [stdout]    |        ----------- fields in this struct
[INFO] [stdout] 19 |     foo_artifact: Rc<FooArtifact>,
[INFO] [stdout]    |     ^^^^^^^^^^^^
[INFO] [stdout] 20 |     baz_artifact: Rc<BazArtifact>
[INFO] [stdout]    |     ^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `BarArtifact` 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: fields `foo_artifact` and `baz_artifact` are never read
[INFO] [stdout]   --> examples/boxed_result.rs:19:2
[INFO] [stdout]    |
[INFO] [stdout] 18 | struct BarArtifact {
[INFO] [stdout]    |        ----------- fields in this struct
[INFO] [stdout] 19 |     foo_artifact: Rc<FooArtifact>,
[INFO] [stdout]    |     ^^^^^^^^^^^^
[INFO] [stdout] 20 |     baz_artifact: Rc<BazArtifact>
[INFO] [stdout]    |     ^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `BarArtifact` 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: 1 warning emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 1 warning emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `artifact_node`
[INFO] [stdout]    --> src/test_impl_dyn.rs:240:6
[INFO] [stdout]     |
[INFO] [stdout] 240 |     let artifact_node = cache.get(&noden1);
[INFO] [stdout]     |         ^^^^^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_artifact_node`
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `artifact_root`
[INFO] [stdout]    --> src/test_impl_dyn.rs:241:6
[INFO] [stdout]     |
[INFO] [stdout] 241 |     let artifact_root = cache.get(&noden3);
[INFO] [stdout]     |         ^^^^^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_artifact_root`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function `new` is never used
[INFO] [stdout]   --> src/test_impl_dyn.rs:60:16
[INFO] [stdout]    |
[INFO] [stdout] 59 | impl BuilderSimpleNode {
[INFO] [stdout]    | ---------------------- associated function in this implementation
[INFO] [stdout] 60 |     pub(crate) fn new(leaf: Blueprint<BuilderLeaf>) -> Self {
[INFO] [stdout]    |                   ^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: methods `leaf`, `left`, and `right` are never used
[INFO] [stdout]    --> src/test_impl_dyn.rs:129:16
[INFO] [stdout]     |
[INFO] [stdout] 128 | impl ComplexNode {
[INFO] [stdout]     | ---------------- methods in this implementation
[INFO] [stdout] 129 |     pub(crate) fn leaf(&self) -> Option<&BinType<Leaf>> {
[INFO] [stdout]     |                   ^^^^
[INFO] [stdout] ...
[INFO] [stdout] 137 |     pub(crate) fn left(&self) -> Option<&BinType<ComplexNode>> {
[INFO] [stdout]     |                   ^^^^
[INFO] [stdout] ...
[INFO] [stdout] 145 |     pub(crate) fn right(&self) -> Option<&BinType<ComplexNode>> {
[INFO] [stdout]     |                   ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: method `builder_ptr` is never used
[INFO] [stdout]    --> src/blueprint.rs:167:16
[INFO] [stdout]     |
[INFO] [stdout] 150 | impl<B, BCan: Can<B>> Blueprint<B, BCan> {
[INFO] [stdout]     | ---------------------------------------- method in this implementation
[INFO] [stdout] ...
[INFO] [stdout] 167 |     pub(crate) fn builder_ptr(&self) -> *const () {
[INFO] [stdout]     |                   ^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: type alias `BuilderDyn` is never used
[INFO] [stdout]    --> src/blueprint.rs:562:6
[INFO] [stdout]     |
[INFO] [stdout] 562 | type BuilderDyn<ArtCan, BCan, Artifact, Err, DynState> = dyn Builder<ArtCan, BCan, Artifact=Artifact, Err=Err, DynState=DynState>;
[INFO] [stdout]     |      ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: method `builder_ptr` is never used
[INFO] [stdout]    --> src/blueprint.rs:674:16
[INFO] [stdout]     |
[INFO] [stdout] 654 | / impl<ArtCan, BCan, Art, Err, DynSt> BlueprintDyn<ArtCan, BCan, Art, Err, DynSt>
[INFO] [stdout] 655 | |     where
[INFO] [stdout] 656 | |         BCan: Can<dyn Builder<ArtCan, BCan, Artifact=Art, Err=Err, DynState=DynSt>>, {
[INFO] [stdout]     | |____________________________________________________________________________________- method in this implementation
[INFO] [stdout] ...
[INFO] [stdout] 674 |       pub(crate) fn builder_ptr(&self) -> *const () {
[INFO] [stdout]     |                     ^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `as_ptr_mut` is never used
[INFO] [stdout]    --> src/test.rs:359:4
[INFO] [stdout]     |
[INFO] [stdout] 359 | fn as_ptr_mut<T,E>(res: Result<&mut T,E>) -> Result<*mut T,E> {
[INFO] [stdout]     |    ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 8 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished `dev` profile [unoptimized + debuginfo] target(s) in 5.52s
[INFO] running `Command { std: "docker" "inspect" "ce813d8f42655d4f9c17cc73d6c97eca153690d180fa5fa5d1102956eed52502", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "ce813d8f42655d4f9c17cc73d6c97eca153690d180fa5fa5d1102956eed52502", kill_on_drop: false }`
[INFO] [stdout] ce813d8f42655d4f9c17cc73d6c97eca153690d180fa5fa5d1102956eed52502