[INFO] fetching crate chars_input 0.2.2...
[INFO] checking chars_input-0.2.2 against master#c2f2db79ca3024f68d22b45aa22b570775c2c4ad for pr-124157
[INFO] extracting crate chars_input 0.2.2 into /workspace/builds/worker-4-tc1/source
[INFO] validating manifest of crates.io crate chars_input 0.2.2 on toolchain c2f2db79ca3024f68d22b45aa22b570775c2c4ad
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+c2f2db79ca3024f68d22b45aa22b570775c2c4ad" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking crates.io crate chars_input 0.2.2
[INFO] finished tweaking crates.io crate chars_input 0.2.2
[INFO] tweaked toml for crates.io crate chars_input 0.2.2 written to /workspace/builds/worker-4-tc1/source/Cargo.toml
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+c2f2db79ca3024f68d22b45aa22b570775c2c4ad" "generate-lockfile" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+c2f2db79ca3024f68d22b45aa22b570775c2c4ad" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-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@sha256:99613afd962a8cfa530ec1899472a458bd015a1ab0af876cf7eb06f6006d81ea" "/opt/rustwide/cargo-home/bin/cargo" "+c2f2db79ca3024f68d22b45aa22b570775c2c4ad" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] da75c911a506dbe0463383e9fcec110cebb685785afcc7334ea173ae63d218a8
[INFO] running `Command { std: "docker" "start" "-a" "da75c911a506dbe0463383e9fcec110cebb685785afcc7334ea173ae63d218a8", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "da75c911a506dbe0463383e9fcec110cebb685785afcc7334ea173ae63d218a8", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "da75c911a506dbe0463383e9fcec110cebb685785afcc7334ea173ae63d218a8", kill_on_drop: false }`
[INFO] [stdout] da75c911a506dbe0463383e9fcec110cebb685785afcc7334ea173ae63d218a8
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-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@sha256:99613afd962a8cfa530ec1899472a458bd015a1ab0af876cf7eb06f6006d81ea" "/opt/rustwide/cargo-home/bin/cargo" "+c2f2db79ca3024f68d22b45aa22b570775c2c4ad" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 84def288f244e87e5e8577eb31de2270d52f734b6a1bf4575d6206aa2e4d8815
[INFO] running `Command { std: "docker" "start" "-a" "84def288f244e87e5e8577eb31de2270d52f734b6a1bf4575d6206aa2e4d8815", kill_on_drop: false }`
[INFO] [stderr]     Checking chars_input v0.2.2 (/opt/rustwide/workdir)
[INFO] [stdout] error[E0412]: cannot find type `Chars` in module `io`
[INFO] [stdout]    --> src/chars.rs:140:20
[INFO] [stdout]     |
[INFO] [stdout] 140 |         chars: io::Chars<R>,
[INFO] [stdout]     |                    ^^^^^ not found in `io`
[INFO] [stdout]     |
[INFO] [stdout] help: consider importing one of these items
[INFO] [stdout]     |
[INFO] [stdout] 118 +     use Chars;
[INFO] [stdout]     |
[INFO] [stdout] 118 +     use alloc::str::Chars;
[INFO] [stdout]     |
[INFO] [stdout] help: if you import `Chars`, refer to it directly
[INFO] [stdout]     |
[INFO] [stdout] 140 -         chars: io::Chars<R>,
[INFO] [stdout] 140 +         chars: Chars<R>,
[INFO] [stdout]     |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0412]: cannot find type `Chars` in module `io`
[INFO] [stdout]    --> src/chars.rs:140:20
[INFO] [stdout]     |
[INFO] [stdout] 140 |         chars: io::Chars<R>,
[INFO] [stdout]     |                    ^^^^^ not found in `io`
[INFO] [stdout]     |
[INFO] [stdout] help: consider importing one of these items
[INFO] [stdout]     |
[INFO] [stdout] 118 +     use Chars;
[INFO] [stdout]     |
[INFO] [stdout] 118 +     use alloc::str::Chars;
[INFO] [stdout]     |
[INFO] [stdout] help: if you import `Chars`, refer to it directly
[INFO] [stdout]     |
[INFO] [stdout] 140 -         chars: io::Chars<R>,
[INFO] [stdout] 140 +         chars: Chars<R>,
[INFO] [stdout]     |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `self::__std::*`
[INFO] [stdout]    --> src/chars.rs:172:9
[INFO] [stdout]     |
[INFO] [stdout] 172 | pub use self::__std::*;
[INFO] [stdout]     |         ^^^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `self::__std::*`
[INFO] [stdout]    --> src/chars.rs:172:9
[INFO] [stdout]     |
[INFO] [stdout] 172 | pub use self::__std::*;
[INFO] [stdout]     |         ^^^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: the feature `alloc` has been stable since 1.36.0 and no longer requires an attribute to enable
[INFO] [stdout]  --> src/lib.rs:1:12
[INFO] [stdout]   |
[INFO] [stdout] 1 | #![feature(alloc)]
[INFO] [stdout]   |            ^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(stable_features)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0635]: unknown feature `io`
[INFO] [stdout]  --> src/lib.rs:2:38
[INFO] [stdout]   |
[INFO] [stdout] 2 | #![cfg_attr(feature = "std", feature(io))]
[INFO] [stdout]   |                                      ^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: the feature `alloc` has been stable since 1.36.0 and no longer requires an attribute to enable
[INFO] [stdout]  --> src/lib.rs:1:12
[INFO] [stdout]   |
[INFO] [stdout] 1 | #![feature(alloc)]
[INFO] [stdout]   |            ^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(stable_features)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0635]: unknown feature `io`
[INFO] [stdout]  --> src/lib.rs:2:38
[INFO] [stdout]   |
[INFO] [stdout] 2 | #![cfg_attr(feature = "std", feature(io))]
[INFO] [stdout]   |                                      ^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]    --> src/input.rs:162:45
[INFO] [stdout]     |
[INFO] [stdout] 162 |     fn trait_object_read_offset(input: &mut Input, state: &mut State, offset: usize) {
[INFO] [stdout]     |                                             ^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = warning: this is accepted in the current edition (Rust 2015) but is a hard error in Rust 2021!
[INFO] [stdout]     = note: for more information, see <https://doc.rust-lang.org/nightly/edition-guide/rust-2021/warnings-promoted-to-error.html>
[INFO] [stdout]     = note: `#[warn(bare_trait_objects)]` on by default
[INFO] [stdout] help: if this is an object-safe trait, use `dyn`
[INFO] [stdout]     |
[INFO] [stdout] 162 |     fn trait_object_read_offset(input: &mut dyn Input, state: &mut State, offset: usize) {
[INFO] [stdout]     |                                             +++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]    --> src/input.rs:166:44
[INFO] [stdout]     |
[INFO] [stdout] 166 |     fn trait_object_read_lines(input: &mut Input, state: &mut State) -> usize {
[INFO] [stdout]     |                                            ^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = warning: this is accepted in the current edition (Rust 2015) but is a hard error in Rust 2021!
[INFO] [stdout]     = note: for more information, see <https://doc.rust-lang.org/nightly/edition-guide/rust-2021/warnings-promoted-to-error.html>
[INFO] [stdout] help: if this is an object-safe trait, use `dyn`
[INFO] [stdout]     |
[INFO] [stdout] 166 |     fn trait_object_read_lines(input: &mut dyn Input, state: &mut State) -> usize {
[INFO] [stdout]     |                                            +++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0599]: no method named `chars` found for type parameter `R` in the current scope
[INFO] [stdout]    --> src/chars.rs:150:31
[INFO] [stdout]     |
[INFO] [stdout] 143 |     impl<R> From<R> for CharsRead<R>
[INFO] [stdout]     |          - method `chars` not found for this type parameter
[INFO] [stdout] ...
[INFO] [stdout] 150 |                 chars: reader.chars(),
[INFO] [stdout]     |                               ^^^^^ method not found in `R`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0599]: no method named `chars` found for type parameter `R` in the current scope
[INFO] [stdout]    --> src/chars.rs:150:31
[INFO] [stdout]     |
[INFO] [stdout] 143 |     impl<R> From<R> for CharsRead<R>
[INFO] [stdout]     |          - method `chars` not found for this type parameter
[INFO] [stdout] ...
[INFO] [stdout] 150 |                 chars: reader.chars(),
[INFO] [stdout]     |                               ^^^^^ method not found in `R`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: aborting due to 3 previous errors; 2 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] Some errors have detailed explanations: E0412, E0599, E0635.
[INFO] [stdout] 
[INFO] [stdout] For more information about an error, try `rustc --explain E0412`.
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `chars_input` (lib) due to 4 previous errors; 2 warnings emitted
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[INFO] [stdout] error: aborting due to 3 previous errors; 4 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] Some errors have detailed explanations: E0412, E0599, E0635.
[INFO] [stdout] 
[INFO] [stdout] For more information about an error, try `rustc --explain E0412`.
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `chars_input` (lib test) due to 4 previous errors; 4 warnings emitted
[INFO] running `Command { std: "docker" "inspect" "84def288f244e87e5e8577eb31de2270d52f734b6a1bf4575d6206aa2e4d8815", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "84def288f244e87e5e8577eb31de2270d52f734b6a1bf4575d6206aa2e4d8815", kill_on_drop: false }`
[INFO] [stdout] 84def288f244e87e5e8577eb31de2270d52f734b6a1bf4575d6206aa2e4d8815
[INFO] checking chars_input-0.2.2 against try#9c7b5f5b6b8ec32bbbcf9f07fc0e5208da6c5f88 for pr-124157
[INFO] extracting crate chars_input 0.2.2 into /workspace/builds/worker-4-tc2/source
[INFO] validating manifest of crates.io crate chars_input 0.2.2 on toolchain 9c7b5f5b6b8ec32bbbcf9f07fc0e5208da6c5f88
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+9c7b5f5b6b8ec32bbbcf9f07fc0e5208da6c5f88" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking crates.io crate chars_input 0.2.2
[INFO] finished tweaking crates.io crate chars_input 0.2.2
[INFO] tweaked toml for crates.io crate chars_input 0.2.2 written to /workspace/builds/worker-4-tc2/source/Cargo.toml
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+9c7b5f5b6b8ec32bbbcf9f07fc0e5208da6c5f88" "generate-lockfile" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+9c7b5f5b6b8ec32bbbcf9f07fc0e5208da6c5f88" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-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@sha256:99613afd962a8cfa530ec1899472a458bd015a1ab0af876cf7eb06f6006d81ea" "/opt/rustwide/cargo-home/bin/cargo" "+9c7b5f5b6b8ec32bbbcf9f07fc0e5208da6c5f88" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 980fbe951541f805bd0c45f631c66c9562e3c66fee956968c63268aa859e39a8
[INFO] running `Command { std: "docker" "start" "-a" "980fbe951541f805bd0c45f631c66c9562e3c66fee956968c63268aa859e39a8", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "980fbe951541f805bd0c45f631c66c9562e3c66fee956968c63268aa859e39a8", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "980fbe951541f805bd0c45f631c66c9562e3c66fee956968c63268aa859e39a8", kill_on_drop: false }`
[INFO] [stdout] 980fbe951541f805bd0c45f631c66c9562e3c66fee956968c63268aa859e39a8
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-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@sha256:99613afd962a8cfa530ec1899472a458bd015a1ab0af876cf7eb06f6006d81ea" "/opt/rustwide/cargo-home/bin/cargo" "+9c7b5f5b6b8ec32bbbcf9f07fc0e5208da6c5f88" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] ac704b036a87da6e0f34b22e83d8efca94d088cc20d982ea9ac9f0cd1fab68d6
[INFO] running `Command { std: "docker" "start" "-a" "ac704b036a87da6e0f34b22e83d8efca94d088cc20d982ea9ac9f0cd1fab68d6", kill_on_drop: false }`
[INFO] [stderr]     Checking chars_input v0.2.2 (/opt/rustwide/workdir)
[INFO] [stdout] error[E0412]: cannot find type `Chars` in module `io`
[INFO] [stdout]    --> src/chars.rs:140:20
[INFO] [stdout]     |
[INFO] [stdout] 140 |         chars: io::Chars<R>,
[INFO] [stdout]     |                    ^^^^^ not found in `io`
[INFO] [stdout]     |
[INFO] [stdout] help: consider importing one of these items
[INFO] [stdout]     |
[INFO] [stdout] 118 +     use Chars;
[INFO] [stdout]     |
[INFO] [stdout] 118 +     use alloc::str::Chars;
[INFO] [stdout]     |
[INFO] [stdout] help: if you import `Chars`, refer to it directly
[INFO] [stdout]     |
[INFO] [stdout] 140 -         chars: io::Chars<R>,
[INFO] [stdout] 140 +         chars: Chars<R>,
[INFO] [stdout]     |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0412]: cannot find type `Chars` in module `io`
[INFO] [stdout]    --> src/chars.rs:140:20
[INFO] [stdout]     |
[INFO] [stdout] 140 |         chars: io::Chars<R>,
[INFO] [stdout]     |                    ^^^^^ not found in `io`
[INFO] [stdout]     |
[INFO] [stdout] help: consider importing one of these items
[INFO] [stdout]     |
[INFO] [stdout] 118 +     use Chars;
[INFO] [stdout]     |
[INFO] [stdout] 118 +     use alloc::str::Chars;
[INFO] [stdout]     |
[INFO] [stdout] help: if you import `Chars`, refer to it directly
[INFO] [stdout]     |
[INFO] [stdout] 140 -         chars: io::Chars<R>,
[INFO] [stdout] 140 +         chars: Chars<R>,
[INFO] [stdout]     |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `self::__std::*`
[INFO] [stdout]    --> src/chars.rs:172:9
[INFO] [stdout]     |
[INFO] [stdout] 172 | pub use self::__std::*;
[INFO] [stdout]     |         ^^^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `self::__std::*`
[INFO] [stdout]    --> src/chars.rs:172:9
[INFO] [stdout]     |
[INFO] [stdout] 172 | pub use self::__std::*;
[INFO] [stdout]     |         ^^^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: the feature `alloc` has been stable since 1.36.0 and no longer requires an attribute to enable
[INFO] [stdout]  --> src/lib.rs:1:12
[INFO] [stdout]   |
[INFO] [stdout] 1 | #![feature(alloc)]
[INFO] [stdout]   |            ^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(stable_features)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0635]: unknown feature `io`
[INFO] [stdout]  --> src/lib.rs:2:38
[INFO] [stdout]   |
[INFO] [stdout] 2 | #![cfg_attr(feature = "std", feature(io))]
[INFO] [stdout]   |                                      ^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: the feature `alloc` has been stable since 1.36.0 and no longer requires an attribute to enable
[INFO] [stdout]  --> src/lib.rs:1:12
[INFO] [stdout]   |
[INFO] [stdout] 1 | #![feature(alloc)]
[INFO] [stdout]   |            ^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(stable_features)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0635]: unknown feature `io`
[INFO] [stdout]  --> src/lib.rs:2:38
[INFO] [stdout]   |
[INFO] [stdout] 2 | #![cfg_attr(feature = "std", feature(io))]
[INFO] [stdout]   |                                      ^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]    --> src/input.rs:162:45
[INFO] [stdout]     |
[INFO] [stdout] 162 |     fn trait_object_read_offset(input: &mut Input, state: &mut State, offset: usize) {
[INFO] [stdout]     |                                             ^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = warning: this is accepted in the current edition (Rust 2015) but is a hard error in Rust 2021!
[INFO] [stdout]     = note: for more information, see <https://doc.rust-lang.org/nightly/edition-guide/rust-2021/warnings-promoted-to-error.html>
[INFO] [stdout]     = note: `#[warn(bare_trait_objects)]` on by default
[INFO] [stdout] help: if this is an object-safe trait, use `dyn`
[INFO] [stdout]     |
[INFO] [stdout] 162 |     fn trait_object_read_offset(input: &mut dyn Input, state: &mut State, offset: usize) {
[INFO] [stdout]     |                                             +++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]    --> src/input.rs:166:44
[INFO] [stdout]     |
[INFO] [stdout] 166 |     fn trait_object_read_lines(input: &mut Input, state: &mut State) -> usize {
[INFO] [stdout]     |                                            ^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = warning: this is accepted in the current edition (Rust 2015) but is a hard error in Rust 2021!
[INFO] [stdout]     = note: for more information, see <https://doc.rust-lang.org/nightly/edition-guide/rust-2021/warnings-promoted-to-error.html>
[INFO] [stdout] help: if this is an object-safe trait, use `dyn`
[INFO] [stdout]     |
[INFO] [stdout] 166 |     fn trait_object_read_lines(input: &mut dyn Input, state: &mut State) -> usize {
[INFO] [stdout]     |                                            +++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0599]: no method named `chars` found for type parameter `R` in the current scope
[INFO] [stdout]    --> src/chars.rs:150:31
[INFO] [stdout]     |
[INFO] [stdout] 143 |     impl<R> From<R> for CharsRead<R>
[INFO] [stdout]     |          - method `chars` not found for this type parameter
[INFO] [stdout] ...
[INFO] [stdout] 150 |                 chars: reader.chars(),
[INFO] [stdout]     |                               ^^^^^ method not found in `R`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0599]: no method named `chars` found for type parameter `R` in the current scope
[INFO] [stdout]    --> src/chars.rs:150:31
[INFO] [stdout]     |
[INFO] [stdout] 143 |     impl<R> From<R> for CharsRead<R>
[INFO] [stdout]     |          - method `chars` not found for this type parameter
[INFO] [stdout] ...
[INFO] [stdout] 150 |                 chars: reader.chars(),
[INFO] [stdout]     |                               ^^^^^ method not found in `R`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: aborting due to 3 previous errors; 2 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] Some errors have detailed explanations: E0412, E0599, E0635.
[INFO] [stdout] 
[INFO] [stdout] For more information about an error, try `rustc --explain E0412`.
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `chars_input` (lib) due to 4 previous errors; 2 warnings emitted
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[INFO] [stdout] error: aborting due to 3 previous errors; 4 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] Some errors have detailed explanations: E0412, E0599, E0635.
[INFO] [stdout] 
[INFO] [stdout] For more information about an error, try `rustc --explain E0412`.
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `chars_input` (lib test) due to 4 previous errors; 4 warnings emitted
[INFO] running `Command { std: "docker" "inspect" "ac704b036a87da6e0f34b22e83d8efca94d088cc20d982ea9ac9f0cd1fab68d6", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "ac704b036a87da6e0f34b22e83d8efca94d088cc20d982ea9ac9f0cd1fab68d6", kill_on_drop: false }`
[INFO] [stdout] ac704b036a87da6e0f34b22e83d8efca94d088cc20d982ea9ac9f0cd1fab68d6
