[INFO] fetching crate prefixopt 0.4.0...
[INFO] testing prefixopt-0.4.0 against 1.44.0 for beta-1.45-1
[INFO] extracting crate prefixopt 0.4.0 into /workspace/builds/worker-2/source
[INFO] validating manifest of crates.io crate prefixopt 0.4.0 on toolchain 1.44.0
[INFO] running `"/workspace/cargo-home/bin/cargo" "+1.44.0" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] started tweaking crates.io crate prefixopt 0.4.0
[INFO] finished tweaking crates.io crate prefixopt 0.4.0
[INFO] tweaked toml for crates.io crate prefixopt 0.4.0 written to /workspace/builds/worker-2/source/Cargo.toml
[INFO] running `"/workspace/cargo-home/bin/cargo" "+1.44.0" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update"`
[INFO] running `"/workspace/cargo-home/bin/cargo" "+1.44.0" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] running `"docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-2/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=warn" "-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" "+1.44.0" "build" "--frozen"`
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] [stdout] 8c4da567013e0c5e22ba513d44d969afb9161b38b0baa0751e81ee96f73c2e49
[INFO] running `"docker" "start" "-a" "8c4da567013e0c5e22ba513d44d969afb9161b38b0baa0751e81ee96f73c2e49"`
[INFO] [stderr] sudo: setrlimit(RLIMIT_CORE): Operation not permitted
[INFO] [stderr]    Compiling scopeguard v0.2.0
[INFO] [stderr]    Compiling map_in_place v0.1.0
[INFO] [stderr]    Compiling prefixopt v0.4.0 (/opt/rustwide/workdir)
[INFO] [stderr] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stderr]   --> src/parsable.rs:56:42
[INFO] [stderr]    |
[INFO] [stderr] 56 |     fn concat_prefix(prefix: &ConcatRef<&Display>) -> Self {
[INFO] [stderr]    |                                          ^^^^^^^ help: use `dyn`: `dyn Display`
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(bare_trait_objects)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stderr]   --> src/parsable.rs:80:42
[INFO] [stderr]    |
[INFO] [stderr] 80 |     fn concat_prefix(prefix: &ConcatRef<&Display>) -> Self {
[INFO] [stderr]    |                                          ^^^^^^^ help: use `dyn`: `dyn Display`
[INFO] [stderr] 
[INFO] [stderr] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stderr]   --> src/parsable.rs:98:42
[INFO] [stderr]    |
[INFO] [stderr] 98 |     fn concat_prefix(prefix: &ConcatRef<&Display>) -> Self {
[INFO] [stderr]    |                                          ^^^^^^^ help: use `dyn`: `dyn Display`
[INFO] [stderr] 
[INFO] [stderr] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stderr]  --> src/core.rs:9:69
[INFO] [stderr]   |
[INFO] [stderr] 9 |         Self::Container::concat_prefix(&ConcatRef::from(&prefix as &Display))
[INFO] [stderr]   |                                                                     ^^^^^^^ help: use `dyn`: `dyn Display`
[INFO] [stderr] 
[INFO] [stderr] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stderr]   --> src/core.rs:15:42
[INFO] [stderr]    |
[INFO] [stderr] 15 |     fn concat_prefix(prefix: &ConcatRef<&Display>) -> Self;
[INFO] [stderr]    |                                          ^^^^^^^ help: use `dyn`: `dyn Display`
[INFO] [stderr] 
[INFO] [stderr] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stderr]   --> src/std_impl.rs:13:42
[INFO] [stderr]    |
[INFO] [stderr] 13 |     fn concat_prefix(prefix: &ConcatRef<&Display>) -> Self {
[INFO] [stderr]    |                                          ^^^^^^^ help: use `dyn`: `dyn Display`
[INFO] [stderr] 
[INFO] [stderr] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stderr]   --> src/std_impl.rs:39:42
[INFO] [stderr]    |
[INFO] [stderr] 39 |     fn concat_prefix(prefix: &ConcatRef<&Display>) -> Self {
[INFO] [stderr]    |                                          ^^^^^^^ help: use `dyn`: `dyn Display`
[INFO] [stderr] 
[INFO] [stderr] warning: 7 warnings emitted
[INFO] [stderr] 
[INFO] [stderr] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stderr]   --> bin/example_1.rs:53:42
[INFO] [stderr]    |
[INFO] [stderr] 53 |     fn concat_prefix(prefix: &ConcatRef<&Display>) -> Self {
[INFO] [stderr]    |                                          ^^^^^^^ help: use `dyn`: `dyn Display`
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(bare_trait_objects)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stderr]   --> bin/example_1.rs:68:42
[INFO] [stderr]    |
[INFO] [stderr] 68 |     fn concat_prefix(prefix: &ConcatRef<&Display>) -> Self {
[INFO] [stderr]    |                                          ^^^^^^^ help: use `dyn`: `dyn Display`
[INFO] [stderr] 
[INFO] [stderr] warning: 2 warnings emitted
[INFO] [stderr] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 1.87s
[INFO] running `"docker" "inspect" "8c4da567013e0c5e22ba513d44d969afb9161b38b0baa0751e81ee96f73c2e49"`
[INFO] running `"docker" "rm" "-f" "8c4da567013e0c5e22ba513d44d969afb9161b38b0baa0751e81ee96f73c2e49"`
[INFO] [stdout] 8c4da567013e0c5e22ba513d44d969afb9161b38b0baa0751e81ee96f73c2e49
[INFO] running `"docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-2/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=warn" "-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" "+1.44.0" "test" "--frozen" "--no-run"`
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] [stdout] 72ce58430d5f154d0eca65b313ae75b48dfa03bc0f2d0c900d9e32814bb8893a
[INFO] running `"docker" "start" "-a" "72ce58430d5f154d0eca65b313ae75b48dfa03bc0f2d0c900d9e32814bb8893a"`
[INFO] [stderr] sudo: setrlimit(RLIMIT_CORE): Operation not permitted
[INFO] [stderr]    Compiling prefixopt v0.4.0 (/opt/rustwide/workdir)
[INFO] [stderr] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stderr]   --> src/parsable.rs:56:42
[INFO] [stderr]    |
[INFO] [stderr] 56 |     fn concat_prefix(prefix: &ConcatRef<&Display>) -> Self {
[INFO] [stderr]    |                                          ^^^^^^^ help: use `dyn`: `dyn Display`
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(bare_trait_objects)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stderr]   --> src/parsable.rs:80:42
[INFO] [stderr]    |
[INFO] [stderr] 80 |     fn concat_prefix(prefix: &ConcatRef<&Display>) -> Self {
[INFO] [stderr]    |                                          ^^^^^^^ help: use `dyn`: `dyn Display`
[INFO] [stderr] 
[INFO] [stderr] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stderr]   --> src/parsable.rs:98:42
[INFO] [stderr]    |
[INFO] [stderr] 98 |     fn concat_prefix(prefix: &ConcatRef<&Display>) -> Self {
[INFO] [stderr]    |                                          ^^^^^^^ help: use `dyn`: `dyn Display`
[INFO] [stderr] 
[INFO] [stderr] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stderr]  --> src/core.rs:9:69
[INFO] [stderr]   |
[INFO] [stderr] 9 |         Self::Container::concat_prefix(&ConcatRef::from(&prefix as &Display))
[INFO] [stderr]   |                                                                     ^^^^^^^ help: use `dyn`: `dyn Display`
[INFO] [stderr] 
[INFO] [stderr] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stderr]   --> src/core.rs:15:42
[INFO] [stderr]    |
[INFO] [stderr] 15 |     fn concat_prefix(prefix: &ConcatRef<&Display>) -> Self;
[INFO] [stderr]    |                                          ^^^^^^^ help: use `dyn`: `dyn Display`
[INFO] [stderr] 
[INFO] [stderr] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stderr]   --> src/std_impl.rs:13:42
[INFO] [stderr]    |
[INFO] [stderr] 13 |     fn concat_prefix(prefix: &ConcatRef<&Display>) -> Self {
[INFO] [stderr]    |                                          ^^^^^^^ help: use `dyn`: `dyn Display`
[INFO] [stderr] 
[INFO] [stderr] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stderr]   --> src/std_impl.rs:39:42
[INFO] [stderr]    |
[INFO] [stderr] 39 |     fn concat_prefix(prefix: &ConcatRef<&Display>) -> Self {
[INFO] [stderr]    |                                          ^^^^^^^ help: use `dyn`: `dyn Display`
[INFO] [stderr] 
[INFO] [stderr] warning: 7 warnings emitted
[INFO] [stderr] 
[INFO] [stderr] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stderr]   --> bin/example_1.rs:53:42
[INFO] [stderr]    |
[INFO] [stderr] 53 |     fn concat_prefix(prefix: &ConcatRef<&Display>) -> Self {
[INFO] [stderr]    |                                          ^^^^^^^ help: use `dyn`: `dyn Display`
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(bare_trait_objects)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stderr]   --> bin/example_1.rs:68:42
[INFO] [stderr]    |
[INFO] [stderr] 68 |     fn concat_prefix(prefix: &ConcatRef<&Display>) -> Self {
[INFO] [stderr]    |                                          ^^^^^^^ help: use `dyn`: `dyn Display`
[INFO] [stderr] 
[INFO] [stderr] warning: 2 warnings emitted
[INFO] [stderr] 
[INFO] [stderr] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stderr]   --> src/parsable.rs:56:42
[INFO] [stderr]    |
[INFO] [stderr] 56 |     fn concat_prefix(prefix: &ConcatRef<&Display>) -> Self {
[INFO] [stderr]    |                                          ^^^^^^^ help: use `dyn`: `dyn Display`
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(bare_trait_objects)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stderr]   --> src/parsable.rs:80:42
[INFO] [stderr]    |
[INFO] [stderr] 80 |     fn concat_prefix(prefix: &ConcatRef<&Display>) -> Self {
[INFO] [stderr]    |                                          ^^^^^^^ help: use `dyn`: `dyn Display`
[INFO] [stderr] 
[INFO] [stderr] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stderr]   --> src/parsable.rs:98:42
[INFO] [stderr]    |
[INFO] [stderr] 98 |     fn concat_prefix(prefix: &ConcatRef<&Display>) -> Self {
[INFO] [stderr]    |                                          ^^^^^^^ help: use `dyn`: `dyn Display`
[INFO] [stderr] 
[INFO] [stderr] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stderr]  --> src/core.rs:9:69
[INFO] [stderr]   |
[INFO] [stderr] 9 |         Self::Container::concat_prefix(&ConcatRef::from(&prefix as &Display))
[INFO] [stderr]   |                                                                     ^^^^^^^ help: use `dyn`: `dyn Display`
[INFO] [stderr] 
[INFO] [stderr] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stderr]   --> src/core.rs:15:42
[INFO] [stderr]    |
[INFO] [stderr] 15 |     fn concat_prefix(prefix: &ConcatRef<&Display>) -> Self;
[INFO] [stderr]    |                                          ^^^^^^^ help: use `dyn`: `dyn Display`
[INFO] [stderr] 
[INFO] [stderr] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stderr]   --> bin/example_1.rs:53:42
[INFO] [stderr]    |
[INFO] [stderr] 53 |     fn concat_prefix(prefix: &ConcatRef<&Display>) -> Self {
[INFO] [stderr]    |                                          ^^^^^^^ help: use `dyn`: `dyn Display`
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(bare_trait_objects)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stderr]   --> src/std_impl.rs:13:42
[INFO] [stderr]    |
[INFO] [stderr] 13 |     fn concat_prefix(prefix: &ConcatRef<&Display>) -> Self {
[INFO] [stderr]    |                                          ^^^^^^^ help: use `dyn`: `dyn Display`
[INFO] [stderr] 
[INFO] [stderr] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stderr]   --> src/std_impl.rs:39:42
[INFO] [stderr]    |
[INFO] [stderr] 39 |     fn concat_prefix(prefix: &ConcatRef<&Display>) -> Self {
[INFO] [stderr]    |                                          ^^^^^^^ help: use `dyn`: `dyn Display`
[INFO] [stderr] 
[INFO] [stderr] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stderr]   --> bin/example_1.rs:68:42
[INFO] [stderr]    |
[INFO] [stderr] 68 |     fn concat_prefix(prefix: &ConcatRef<&Display>) -> Self {
[INFO] [stderr]    |                                          ^^^^^^^ help: use `dyn`: `dyn Display`
[INFO] [stderr] 
[INFO] [stderr] warning: 7 warnings emitted
[INFO] [stderr] 
[INFO] [stderr] warning: 2 warnings emitted
[INFO] [stderr] 
[INFO] [stderr]     Finished test [unoptimized + debuginfo] target(s) in 1.65s
[INFO] running `"docker" "inspect" "72ce58430d5f154d0eca65b313ae75b48dfa03bc0f2d0c900d9e32814bb8893a"`
[INFO] running `"docker" "rm" "-f" "72ce58430d5f154d0eca65b313ae75b48dfa03bc0f2d0c900d9e32814bb8893a"`
[INFO] [stdout] 72ce58430d5f154d0eca65b313ae75b48dfa03bc0f2d0c900d9e32814bb8893a
[INFO] running `"docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-2/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=warn" "-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" "+1.44.0" "test" "--frozen"`
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] [stdout] a03b8a89c3b7eee01dd53707990b8aa3f1b567fd42c05018110a33edb5216d95
[INFO] running `"docker" "start" "-a" "a03b8a89c3b7eee01dd53707990b8aa3f1b567fd42c05018110a33edb5216d95"`
[INFO] [stderr] sudo: setrlimit(RLIMIT_CORE): Operation not permitted
[INFO] [stderr] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stderr]   --> src/parsable.rs:56:42
[INFO] [stderr]    |
[INFO] [stderr] 56 |     fn concat_prefix(prefix: &ConcatRef<&Display>) -> Self {
[INFO] [stderr]    |                                          ^^^^^^^ help: use `dyn`: `dyn Display`
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(bare_trait_objects)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stderr]   --> src/parsable.rs:80:42
[INFO] [stderr]    |
[INFO] [stderr] 80 |     fn concat_prefix(prefix: &ConcatRef<&Display>) -> Self {
[INFO] [stderr]    |                                          ^^^^^^^ help: use `dyn`: `dyn Display`
[INFO] [stderr] 
[INFO] [stderr] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stderr]   --> src/parsable.rs:98:42
[INFO] [stderr]    |
[INFO] [stderr] 98 |     fn concat_prefix(prefix: &ConcatRef<&Display>) -> Self {
[INFO] [stderr]    |                                          ^^^^^^^ help: use `dyn`: `dyn Display`
[INFO] [stderr] 
[INFO] [stderr] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stderr]  --> src/core.rs:9:69
[INFO] [stderr]   |
[INFO] [stderr] 9 |         Self::Container::concat_prefix(&ConcatRef::from(&prefix as &Display))
[INFO] [stderr]   |                                                                     ^^^^^^^ help: use `dyn`: `dyn Display`
[INFO] [stderr] 
[INFO] [stderr] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stderr]   --> src/core.rs:15:42
[INFO] [stderr]    |
[INFO] [stderr] 15 |     fn concat_prefix(prefix: &ConcatRef<&Display>) -> Self;
[INFO] [stderr]    |                                          ^^^^^^^ help: use `dyn`: `dyn Display`
[INFO] [stderr] 
[INFO] [stderr] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stderr]   --> src/std_impl.rs:13:42
[INFO] [stderr]    |
[INFO] [stderr] 13 |     fn concat_prefix(prefix: &ConcatRef<&Display>) -> Self {
[INFO] [stderr]    |                                          ^^^^^^^ help: use `dyn`: `dyn Display`
[INFO] [stderr] 
[INFO] [stderr] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stderr]   --> src/std_impl.rs:39:42
[INFO] [stderr]    |
[INFO] [stderr] 39 |     fn concat_prefix(prefix: &ConcatRef<&Display>) -> Self {
[INFO] [stderr]    |                                          ^^^^^^^ help: use `dyn`: `dyn Display`
[INFO] [stderr] 
[INFO] [stderr] warning: 7 warnings emitted
[INFO] [stderr] 
[INFO] [stderr] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stderr]   --> src/parsable.rs:56:42
[INFO] [stderr]    |
[INFO] [stderr] 56 |     fn concat_prefix(prefix: &ConcatRef<&Display>) -> Self {
[INFO] [stderr]    |                                          ^^^^^^^ help: use `dyn`: `dyn Display`
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(bare_trait_objects)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stderr]   --> src/parsable.rs:80:42
[INFO] [stderr]    |
[INFO] [stderr] 80 |     fn concat_prefix(prefix: &ConcatRef<&Display>) -> Self {
[INFO] [stderr]    |                                          ^^^^^^^ help: use `dyn`: `dyn Display`
[INFO] [stderr] 
[INFO] [stderr] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stderr]   --> src/parsable.rs:98:42
[INFO] [stderr]    |
[INFO] [stderr] 98 |     fn concat_prefix(prefix: &ConcatRef<&Display>) -> Self {
[INFO] [stderr]    |                                          ^^^^^^^ help: use `dyn`: `dyn Display`
[INFO] [stderr] 
[INFO] [stderr] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stderr]  --> src/core.rs:9:69
[INFO] [stderr]   |
[INFO] [stderr] 9 |         Self::Container::concat_prefix(&ConcatRef::from(&prefix as &Display))
[INFO] [stderr]   |                                                                     ^^^^^^^ help: use `dyn`: `dyn Display`
[INFO] [stderr] 
[INFO] [stderr] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stderr]   --> src/core.rs:15:42
[INFO] [stderr]    |
[INFO] [stderr] 15 |     fn concat_prefix(prefix: &ConcatRef<&Display>) -> Self;
[INFO] [stderr]    |                                          ^^^^^^^ help: use `dyn`: `dyn Display`
[INFO] [stderr] 
[INFO] [stderr] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stderr]   --> src/std_impl.rs:13:42
[INFO] [stderr]    |
[INFO] [stderr] 13 |     fn concat_prefix(prefix: &ConcatRef<&Display>) -> Self {
[INFO] [stderr]    |                                          ^^^^^^^ help: use `dyn`: `dyn Display`
[INFO] [stderr] 
[INFO] [stderr] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stderr]   --> src/std_impl.rs:39:42
[INFO] [stderr]    |
[INFO] [stderr] 39 |     fn concat_prefix(prefix: &ConcatRef<&Display>) -> Self {
[INFO] [stderr]    |                                          ^^^^^^^ help: use `dyn`: `dyn Display`
[INFO] [stderr] 
[INFO] [stderr] warning: 7 warnings emitted
[INFO] [stderr] 
[INFO] [stderr] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stderr]   --> bin/example_1.rs:53:42
[INFO] [stderr]    |
[INFO] [stderr] 53 |     fn concat_prefix(prefix: &ConcatRef<&Display>) -> Self {
[INFO] [stderr]    |                                          ^^^^^^^ help: use `dyn`: `dyn Display`
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(bare_trait_objects)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stderr]   --> bin/example_1.rs:68:42
[INFO] [stderr]    |
[INFO] [stderr] 68 |     fn concat_prefix(prefix: &ConcatRef<&Display>) -> Self {
[INFO] [stderr]    |                                          ^^^^^^^ help: use `dyn`: `dyn Display`
[INFO] [stderr] 
[INFO] [stderr] warning: 2 warnings emitted
[INFO] [stderr] 
[INFO] [stderr] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stderr]   --> bin/example_1.rs:53:42
[INFO] [stderr]    |
[INFO] [stderr] 53 |     fn concat_prefix(prefix: &ConcatRef<&Display>) -> Self {
[INFO] [stderr]    |                                          ^^^^^^^ help: use `dyn`: `dyn Display`
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(bare_trait_objects)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stderr]   --> bin/example_1.rs:68:42
[INFO] [stderr]    |
[INFO] [stderr] 68 |     fn concat_prefix(prefix: &ConcatRef<&Display>) -> Self {
[INFO] [stderr]    |                                          ^^^^^^^ help: use `dyn`: `dyn Display`
[INFO] [stderr] 
[INFO] [stderr] warning: 2 warnings emitted
[INFO] [stderr] 
[INFO] [stderr]     Finished test [unoptimized + debuginfo] target(s) in 0.07s
[INFO] [stderr]      Running /opt/rustwide/target/debug/deps/prefixopt-e69d45ba5bb501d9
[INFO] [stdout] 
[INFO] [stdout] running 0 tests
[INFO] [stdout] 
[INFO] [stdout] test result: ok. 0 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out
[INFO] [stdout] 
[INFO] [stderr]      Running /opt/rustwide/target/debug/deps/example_1-c16f0e87c30bde2c
[INFO] [stderr]      Running /opt/rustwide/target/debug/deps/stdlib-9d6bef01228bf539
[INFO] [stdout] 
[INFO] [stdout] running 0 tests
[INFO] [stdout] 
[INFO] [stdout] test result: ok. 0 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] running 4 tests
[INFO] [stdout] test test_option_none ... ok
[INFO] [stdout] test test_box_no_opt ... ok
[INFO] [stdout] test test_box ... ok
[INFO] [stderr]    Doc-tests prefixopt
[INFO] [stdout] test test_option_some ... ok
[INFO] [stdout] 
[INFO] [stdout] test result: ok. 4 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] running 0 tests
[INFO] [stdout] 
[INFO] [stdout] test result: ok. 0 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out
[INFO] [stdout] 
[INFO] running `"docker" "inspect" "a03b8a89c3b7eee01dd53707990b8aa3f1b567fd42c05018110a33edb5216d95"`
[INFO] running `"docker" "rm" "-f" "a03b8a89c3b7eee01dd53707990b8aa3f1b567fd42c05018110a33edb5216d95"`
[INFO] [stdout] a03b8a89c3b7eee01dd53707990b8aa3f1b567fd42c05018110a33edb5216d95