[INFO] fetching crate tnetstring 0.2.0...
[INFO] testing tnetstring-0.2.0 against 1.100.0-beta.1 for beta-1.100-2
[INFO] extracting crate tnetstring 0.2.0 into /workspace/builds/worker-7-tc2/source
[INFO] started tweaking crates.io crate tnetstring 0.2.0
[INFO] finished tweaking crates.io crate tnetstring 0.2.0
[INFO] tweaked toml for crates.io crate tnetstring 0.2.0 written to /workspace/builds/worker-7-tc2/source/Cargo.toml
[INFO] validating manifest of crates.io crate tnetstring 0.2.0 on toolchain 1.100.0-beta.1
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+1.100.0-beta.1" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+1.100.0-beta.1" "generate-lockfile" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Updating crates.io index
[INFO] [stderr]      Locking 8 packages to highest compatible versions
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+1.100.0-beta.1" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-7-tc2/source:/opt/rustwide/workdir:ro,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-7-tc2/target:/opt/rustwide/target:rw,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" "-m" "1610612736" "--network" "none" "ghcr.io/rust-lang/crates-build-env/linux@sha256:3111399a4047eeb3a02b7a90e478d715f38a8c6669b5c4b49d30a17385265909" "sleep" "infinity", kill_on_drop: false }`
[INFO] [stdout] 98514d9d6d9edf86b741a616bb55da97af357ddbe76077f631934bc93cf5fec1
[INFO] running `Command { std: "docker" "start" "98514d9d6d9edf86b741a616bb55da97af357ddbe76077f631934bc93cf5fec1", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "98514d9d6d9edf86b741a616bb55da97af357ddbe76077f631934bc93cf5fec1", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "exec" "-e" "SOURCE_DIR=/opt/rustwide/workdir" "-e" "CARGO_HOME=/opt/rustwide/cargo-home" "-e" "RUSTUP_HOME=/opt/rustwide/rustup-home" "-e" "CARGO_TARGET_DIR=/opt/rustwide/target" "-w" "/opt/rustwide/workdir" "--user" "0:0" "98514d9d6d9edf86b741a616bb55da97af357ddbe76077f631934bc93cf5fec1" "/opt/rustwide/cargo-home/bin/cargo" "+1.100.0-beta.1" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "98514d9d6d9edf86b741a616bb55da97af357ddbe76077f631934bc93cf5fec1", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "exec" "-e" "SOURCE_DIR=/opt/rustwide/workdir" "-e" "CARGO_HOME=/opt/rustwide/cargo-home" "-e" "RUSTUP_HOME=/opt/rustwide/rustup-home" "-e" "CARGO_TARGET_DIR=/opt/rustwide/target" "-e" "CARGO_INCREMENTAL=0" "-e" "RUST_BACKTRACE=full" "-e" "RUSTFLAGS=--cap-lints=warn" "-e" "RUSTDOCFLAGS=--cap-lints=warn" "-w" "/opt/rustwide/workdir" "--user" "0:0" "98514d9d6d9edf86b741a616bb55da97af357ddbe76077f631934bc93cf5fec1" "/opt/rustwide/cargo-home/bin/cargo" "+1.100.0-beta.1" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stderr]    Compiling proc-macro2 v1.0.107
[INFO] [stderr]    Compiling quote v1.0.47
[INFO] [stderr]    Compiling serde_core v1.0.229
[INFO] [stderr]    Compiling serde v1.0.229
[INFO] [stderr]    Compiling maplit v1.0.2
[INFO] [stderr]    Compiling syn v3.0.6
[INFO] [stderr]    Compiling serde_derive v1.0.229
[INFO] [stderr]    Compiling tnetstring v0.2.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: use of deprecated method `std::error::Error::description`: use the Display impl or to_string()
[INFO] [stdout]   --> src/error.rs:50:48
[INFO] [stdout]    |
[INFO] [stdout] 50 |         formatter.write_str(std::error::Error::description(self))
[INFO] [stdout]    |                                                ^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(deprecated)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0283]: type annotations needed
[INFO] [stdout]   --> src/ser.rs:49:18
[INFO] [stdout]    |
[INFO] [stdout] 49 |         .map(|x| String::from(x.as_ref()))
[INFO] [stdout]    |                  ^^^^^^ cannot infer type for reference `&_`
[INFO] [stdout]    |
[INFO] [stdout]    = note: multiple `impl`s satisfying `String: From<&_>` found in the `alloc` crate:
[INFO] [stdout]            - impl From<&String> for String;
[INFO] [stdout]            - impl From<&str> for String;
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0283]: type annotations needed
[INFO] [stdout]   --> src/ser.rs:49:33
[INFO] [stdout]    |
[INFO] [stdout] 49 |         .map(|x| String::from(x.as_ref()))
[INFO] [stdout]    |                                 ^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: multiple `impl`s satisfying `String: AsRef<_>` found in the following crates: `alloc`, `std`:
[INFO] [stdout]            - impl AsRef<OsStr> for String;
[INFO] [stdout]            - impl AsRef<Path> for String;
[INFO] [stdout]            - impl AsRef<[u8]> for String;
[INFO] [stdout]            - impl AsRef<str> for String;
[INFO] [stdout] help: try using a fully qualified path to specify the expected types
[INFO] [stdout]    |
[INFO] [stdout] 49 -         .map(|x| String::from(x.as_ref()))
[INFO] [stdout] 49 +         .map(|x| String::from(<String as AsRef<T>>::as_ref(x)))
[INFO] [stdout]    |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `error`
[INFO] [stdout]   --> src/error.rs:43:13
[INFO] [stdout]    |
[INFO] [stdout] 43 |     fn from(error: std::string::FromUtf8Error) -> Self {
[INFO] [stdout]    |             ^^^^^ help: if this is intentional, prefix it with an underscore: `_error`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_variables)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] For more information about this error, try `rustc --explain E0283`.
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `tnetstring` (lib) due to 2 previous errors; 2 warnings emitted
[INFO] [stderr] warning: unused dependency `maplit`
[INFO] [stderr]  --> Cargo.toml:1:15
[INFO] [stderr]   |
[INFO] [stderr] 1 | [dependencies.maplit]
[INFO] [stderr]   |               ^^^^^^^
[INFO] [stderr]   |
[INFO] [stderr]   = note: `cargo::unused_dependencies` is set to `warn` by default
[INFO] [stderr] help: consider removing the dependency on `maplit`
[INFO] [stderr] warning: `tnetstring` (manifest) generated 1 warning
[INFO] running `Command { std: "docker" "inspect" "98514d9d6d9edf86b741a616bb55da97af357ddbe76077f631934bc93cf5fec1", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "98514d9d6d9edf86b741a616bb55da97af357ddbe76077f631934bc93cf5fec1", kill_on_drop: false }`
[INFO] [stdout] 98514d9d6d9edf86b741a616bb55da97af357ddbe76077f631934bc93cf5fec1
