[INFO] crate libimagref 0.3.0 is already in cache
[INFO] checking libimagref-0.3.0 against beta-2019-10-27 for pr-65897
[INFO] extracting crate libimagref 0.3.0 into /workspace/builds/worker-7/source
[INFO] validating manifest of crates.io crate libimagref 0.3.0 on toolchain beta-2019-10-27
[INFO] running `"/workspace/cargo-home/bin/cargo" "+beta-2019-10-27" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] started tweaking crates.io crate libimagref 0.3.0
[INFO] finished tweaking crates.io crate libimagref 0.3.0
[INFO] tweaked toml for crates.io crate libimagref 0.3.0 written to /workspace/builds/worker-7/source/Cargo.toml
[INFO] running `"/workspace/cargo-home/bin/cargo" "+beta-2019-10-27" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update"`
[INFO] running `"/workspace/cargo-home/bin/cargo" "+beta-2019-10-27" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] running `"docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-7/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-7/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" "MAP_USER_ID=0" "-e" "CARGO_TARGET_DIR=/opt/rustwide/target" "-e" "CARGO_INCREMENTAL=0" "-e" "RUST_BACKTRACE=full" "-e" "RUSTFLAGS=--cap-lints=allow" "-e" "CARGO_HOME=/opt/rustwide/cargo-home" "-e" "RUSTUP_HOME=/opt/rustwide/rustup-home" "-w" "/opt/rustwide/workdir" "-m" "1610612736" "--network" "none" "rustops/crates-build-env" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2019-10-27" "check" "--frozen" "--all" "--all-targets"`
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] [stdout] 7c5ed9576dad71d0d0bdc872eaf94d12db22e15b0302f3d6e4fd8a5d5c830c4e
[INFO] running `"docker" "start" "-a" "7c5ed9576dad71d0d0bdc872eaf94d12db22e15b0302f3d6e4fd8a5d5c830c4e"`
[INFO] [stderr]     Checking same-file v0.1.3
[INFO] [stderr]     Checking version v2.0.1
[INFO] [stderr]     Checking is-match v0.1.0
[INFO] [stderr]     Checking itertools v0.5.10
[INFO] [stderr]     Checking fs2 v0.4.3
[INFO] [stderr]     Checking libimagerror v0.3.0
[INFO] [stderr]     Checking tempfile v2.2.0
[INFO] [stderr]     Checking semver-parser v0.6.2
[INFO] [stderr]     Checking walkdir v1.0.7
[INFO] [stderr]     Checking libimagutil v0.3.0
[INFO] [stderr]     Checking semver v0.5.1
[INFO] [stderr]     Checking libimagstore v0.3.0
[INFO] [stderr]     Checking libimagentrylist v0.3.0
[INFO] [stderr]     Checking libimagref v0.3.0 (/opt/rustwide/workdir)
[INFO] [stderr] error[E0034]: multiple applicable items in scope
[INFO] [stderr]    --> src/reference.rs:531:22
[INFO] [stderr]     |
[INFO] [stderr] 531 |                     .flatten()
[INFO] [stderr]     |                      ^^^^^^^ multiple `flatten` found
[INFO] [stderr]     |
[INFO] [stderr]     = note: candidate #1 is defined in an impl of the trait `std::iter::Iterator` for the type `std::iter::Map<_, _>`
[INFO] [stderr]     = help: to disambiguate the method call, write `std::iter::Iterator::flatten(search_roots
[INFO] [stderr]                                 .unwrap_or(vec![PathBuf::from("/")])
[INFO] [stderr]                                 .into_iter()
[INFO] [stderr]                                 .map(|root| {
[INFO] [stderr]                                     WalkDir::new(root)
[INFO] [stderr]                                         .follow_links(false)
[INFO] [stderr]                                         .into_iter()
[INFO] [stderr]                                         .map(|entry| {
[INFO] [stderr]                                             entry
[INFO] [stderr]                                                 .map_err(Box::new)
[INFO] [stderr]                                                 .map_err(|e| REK::IOError.into_error_with_cause(e))
[INFO] [stderr]                                                 .and_then(|entry| {
[INFO] [stderr]                                                     let pb = PathBuf::from(entry.path());
[INFO] [stderr]                                                     File::open(entry.path())
[INFO] [stderr]                                                         .map_err(Box::new)
[INFO] [stderr]                                                         .map_err(|e| REK::IOError.into_error_with_cause(e))
[INFO] [stderr]                                                         .map(|f| (pb, f))
[INFO] [stderr]                                                 })
[INFO] [stderr]                                                 .and_then(|(p, mut f)|  h.create_hash(&p, &mut f).map(|h| (p, h)))
[INFO] [stderr]                                                 .map(|(path, hash)| {
[INFO] [stderr]                                                     if hash == stored_hash {
[INFO] [stderr]                                                         Some(path)
[INFO] [stderr]                                                     } else {
[INFO] [stderr]                                                         None
[INFO] [stderr]                                                     }
[INFO] [stderr]                                                 })
[INFO] [stderr]                                                 .map_err(Box::new)
[INFO] [stderr]                                                 .map_err(|e| REK::IOError.into_error_with_cause(e))
[INFO] [stderr]                                         })
[INFO] [stderr]                                         .filter_map(|e| e.ok())
[INFO] [stderr]                                         .filter_map(|e| e)
[INFO] [stderr]                                         .next()
[INFO] [stderr]                                 }))` instead
[INFO] [stderr]     = note: candidate #2 is defined in an impl of the trait `itertools::Itertools` for the type `_`
[INFO] [stderr]     = help: to disambiguate the method call, write `itertools::Itertools::flatten(search_roots
[INFO] [stderr]                                 .unwrap_or(vec![PathBuf::from("/")])
[INFO] [stderr]                                 .into_iter()
[INFO] [stderr]                                 .map(|root| {
[INFO] [stderr]                                     WalkDir::new(root)
[INFO] [stderr]                                         .follow_links(false)
[INFO] [stderr]                                         .into_iter()
[INFO] [stderr]                                         .map(|entry| {
[INFO] [stderr]                                             entry
[INFO] [stderr]                                                 .map_err(Box::new)
[INFO] [stderr]                                                 .map_err(|e| REK::IOError.into_error_with_cause(e))
[INFO] [stderr]                                                 .and_then(|entry| {
[INFO] [stderr]                                                     let pb = PathBuf::from(entry.path());
[INFO] [stderr]                                                     File::open(entry.path())
[INFO] [stderr]                                                         .map_err(Box::new)
[INFO] [stderr]                                                         .map_err(|e| REK::IOError.into_error_with_cause(e))
[INFO] [stderr]                                                         .map(|f| (pb, f))
[INFO] [stderr]                                                 })
[INFO] [stderr]                                                 .and_then(|(p, mut f)|  h.create_hash(&p, &mut f).map(|h| (p, h)))
[INFO] [stderr]                                                 .map(|(path, hash)| {
[INFO] [stderr]                                                     if hash == stored_hash {
[INFO] [stderr]                                                         Some(path)
[INFO] [stderr]                                                     } else {
[INFO] [stderr]                                                         None
[INFO] [stderr]                                                     }
[INFO] [stderr]                                                 })
[INFO] [stderr]                                                 .map_err(Box::new)
[INFO] [stderr]                                                 .map_err(|e| REK::IOError.into_error_with_cause(e))
[INFO] [stderr]                                         })
[INFO] [stderr]                                         .filter_map(|e| e.ok())
[INFO] [stderr]                                         .filter_map(|e| e)
[INFO] [stderr]                                         .next()
[INFO] [stderr]                                 }))` instead
[INFO] [stderr] 
[INFO] [stderr] error: aborting due to previous error
[INFO] [stderr] 
[INFO] [stderr] For more information about this error, try `rustc --explain E0034`.
[INFO] [stderr] error[E0034]: multiple applicable items in scope
[INFO] [stderr]    --> src/reference.rs:531:22
[INFO] [stderr]     |
[INFO] [stderr] 531 |                     .flatten()
[INFO] [stderr]     |                      ^^^^^^^ multiple `flatten` found
[INFO] [stderr]     |
[INFO] [stderr]     = note: candidate #1 is defined in an impl of the trait `std::iter::Iterator` for the type `std::iter::Map<_, _>`
[INFO] [stderr]     = help: to disambiguate the method call, write `std::iter::Iterator::flatten(search_roots
[INFO] [stderr]                                 .unwrap_or(vec![PathBuf::from("/")])
[INFO] [stderr]                                 .into_iter()
[INFO] [stderr]                                 .map(|root| {
[INFO] [stderr]                                     WalkDir::new(root)
[INFO] [stderr]                                         .follow_links(false)
[INFO] [stderr]                                         .into_iter()
[INFO] [stderr]                                         .map(|entry| {
[INFO] [stderr]                                             entry
[INFO] [stderr]                                                 .map_err(Box::new)
[INFO] [stderr]                                                 .map_err(|e| REK::IOError.into_error_with_cause(e))
[INFO] [stderr]                                                 .and_then(|entry| {
[INFO] [stderr]                                                     let pb = PathBuf::from(entry.path());
[INFO] [stderr]                                                     File::open(entry.path())
[INFO] [stderr]                                                         .map_err(Box::new)
[INFO] [stderr]                                                         .map_err(|e| REK::IOError.into_error_with_cause(e))
[INFO] [stderr]                                                         .map(|f| (pb, f))
[INFO] [stderr]                                                 })
[INFO] [stderr]                                                 .and_then(|(p, mut f)|  h.create_hash(&p, &mut f).map(|h| (p, h)))
[INFO] [stderr]                                                 .map(|(path, hash)| {
[INFO] [stderr]                                                     if hash == stored_hash {
[INFO] [stderr]                                                         Some(path)
[INFO] [stderr]                                                     } else {
[INFO] [stderr]                                                         None
[INFO] [stderr]                                                     }
[INFO] [stderr]                                                 })
[INFO] [stderr]                                                 .map_err(Box::new)
[INFO] [stderr]                                                 .map_err(|e| REK::IOError.into_error_with_cause(e))
[INFO] [stderr]                                         })
[INFO] [stderr]                                         .filter_map(|e| e.ok())
[INFO] [stderr]                                         .filter_map(|e| e)
[INFO] [stderr]                                         .next()
[INFO] [stderr]                                 }))` instead
[INFO] [stderr]     = note: candidate #2 is defined in an impl of the trait `itertools::Itertools` for the type `_`
[INFO] [stderr]     = help: to disambiguate the method call, write `itertools::Itertools::flatten(search_roots
[INFO] [stderr]                                 .unwrap_or(vec![PathBuf::from("/")])
[INFO] [stderr]                                 .into_iter()
[INFO] [stderr]                                 .map(|root| {
[INFO] [stderr]                                     WalkDir::new(root)
[INFO] [stderr]                                         .follow_links(false)
[INFO] [stderr]                                         .into_iter()
[INFO] [stderr]                                         .map(|entry| {
[INFO] [stderr]                                             entry
[INFO] [stderr]                                                 .map_err(Box::new)
[INFO] [stderr]                                                 .map_err(|e| REK::IOError.into_error_with_cause(e))
[INFO] [stderr]                                                 .and_then(|entry| {
[INFO] [stderr]                                                     let pb = PathBuf::from(entry.path());
[INFO] [stderr]                                                     File::open(entry.path())
[INFO] [stderr]                                                         .map_err(Box::new)
[INFO] [stderr]                                                         .map_err(|e| REK::IOError.into_error_with_cause(e))
[INFO] [stderr]                                                         .map(|f| (pb, f))
[INFO] [stderr]                                                 })
[INFO] [stderr]                                                 .and_then(|(p, mut f)|  h.create_hash(&p, &mut f).map(|h| (p, h)))
[INFO] [stderr]                                                 .map(|(path, hash)| {
[INFO] [stderr]                                                     if hash == stored_hash {
[INFO] [stderr]                                                         Some(path)
[INFO] [stderr]                                                     } else {
[INFO] [stderr]                                                         None
[INFO] [stderr]                                                     }
[INFO] [stderr]                                                 })
[INFO] [stderr]                                                 .map_err(Box::new)
[INFO] [stderr]                                                 .map_err(|e| REK::IOError.into_error_with_cause(e))
[INFO] [stderr]                                         })
[INFO] [stderr]                                         .filter_map(|e| e.ok())
[INFO] [stderr]                                         .filter_map(|e| e)
[INFO] [stderr]                                         .next()
[INFO] [stderr]                                 }))` instead
[INFO] [stderr] 
[INFO] [stderr] error: could not compile `libimagref`.
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[INFO] [stderr] error: aborting due to previous error
[INFO] [stderr] 
[INFO] [stderr] For more information about this error, try `rustc --explain E0034`.
[INFO] [stderr] error: could not compile `libimagref`.
[INFO] [stderr] 
[INFO] [stderr] To learn more, run the command again with --verbose.
[INFO] running `"docker" "inspect" "7c5ed9576dad71d0d0bdc872eaf94d12db22e15b0302f3d6e4fd8a5d5c830c4e"`
[INFO] running `"docker" "rm" "-f" "7c5ed9576dad71d0d0bdc872eaf94d12db22e15b0302f3d6e4fd8a5d5c830c4e"`
[INFO] [stdout] 7c5ed9576dad71d0d0bdc872eaf94d12db22e15b0302f3d6e4fd8a5d5c830c4e