[INFO] fetching crate string-alloc 0.0.3...
[INFO] testing string-alloc-0.0.3 against 1.100.0-beta.1 for beta-1.100-2
[INFO] extracting crate string-alloc 0.0.3 into /workspace/builds/worker-5-tc2/source
[INFO] removed /workspace/builds/worker-5-tc2/source/rust-toolchain.toml
[INFO] started tweaking crates.io crate string-alloc 0.0.3
[INFO] removed 0 missing tests
[INFO] finished tweaking crates.io crate string-alloc 0.0.3
[INFO] tweaked toml for crates.io crate string-alloc 0.0.3 written to /workspace/builds/worker-5-tc2/source/Cargo.toml
[INFO] validating manifest of crates.io crate string-alloc 0.0.3 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] crate crates.io crate string-alloc 0.0.3 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" "+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-5-tc2/source:/opt/rustwide/workdir:ro,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-5-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] 23e76f6398a43798c349a623bde475ef588d1f538a6aacbd6ed7823167034de1
[INFO] running `Command { std: "docker" "start" "23e76f6398a43798c349a623bde475ef588d1f538a6aacbd6ed7823167034de1", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "23e76f6398a43798c349a623bde475ef588d1f538a6aacbd6ed7823167034de1", 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" "23e76f6398a43798c349a623bde475ef588d1f538a6aacbd6ed7823167034de1" "/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" "23e76f6398a43798c349a623bde475ef588d1f538a6aacbd6ed7823167034de1", 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" "23e76f6398a43798c349a623bde475ef588d1f538a6aacbd6ed7823167034de1" "/opt/rustwide/cargo-home/bin/cargo" "+1.100.0-beta.1" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stderr]    Compiling string-alloc v0.0.3 (/opt/rustwide/workdir)
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the beta release channel
[INFO] [stdout]   --> src/lib.rs:86:1
[INFO] [stdout]    |
[INFO] [stdout] 86 | #![feature(allocator_api)]
[INFO] [stdout]    | ^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: the feature `allocator_api` has been partially stabilized since 1.100.0 and is succeeded by the feature `allocator_ext`
[INFO] [stdout]   --> src/lib.rs:86:12
[INFO] [stdout]    |
[INFO] [stdout] 86 | #![feature(allocator_api)]
[INFO] [stdout]    |            ^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(stable_features)]` on by default
[INFO] [stdout] help: if you are using features which are still unstable, change to using `allocator_ext`
[INFO] [stdout]    |
[INFO] [stdout] 86 - #![feature(allocator_api)]
[INFO] [stdout] 86 + #![feature(allocator_ext)]
[INFO] [stdout]    |
[INFO] [stdout] help: if you are using features which are now stable, remove this line
[INFO] [stdout]    |
[INFO] [stdout] 86 - #![feature(allocator_api)]
[INFO] [stdout]    |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0658]: use of unstable library feature `allocator_ext`
[INFO] [stdout]   --> src/string.rs:99:18
[INFO] [stdout]    |
[INFO] [stdout] 99 |         self.vec.splice(byte_idx..byte_idx, bytes.as_bytes().iter().cloned());
[INFO] [stdout]    |                  ^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: required for `A` to implement `alloc::alloc::AllocatorNightly`
[INFO] [stdout] note: required by a bound in `Vec::<T, A>::splice`
[INFO] [stdout]   --> /rustc/e3feeb59cd1bdd011a2bfcc0747b55125d9b8527/library/alloc/src/vec/mod.rs:4234:4
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0658]: use of unstable library feature `allocator_ext`
[INFO] [stdout]    --> src/string.rs:113:18
[INFO] [stdout]     |
[INFO] [stdout] 113 |         self.vec.drain(start..end);
[INFO] [stdout]     |                  ^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: required for `A` to implement `alloc::alloc::AllocatorNightly`
[INFO] [stdout] note: required by a bound in `Vec::<T, A>::drain`
[INFO] [stdout]    --> /rustc/e3feeb59cd1bdd011a2bfcc0747b55125d9b8527/library/alloc/src/vec/mod.rs:3047:4
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0658]: use of unstable library feature `allocator_ext`
[INFO] [stdout]    --> src/string.rs:157:26
[INFO] [stdout]     |
[INFO] [stdout] 157 |                 self.vec.drain(i..i + ch_len);
[INFO] [stdout]     |                          ^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: required for `A` to implement `alloc::alloc::AllocatorNightly`
[INFO] [stdout] note: required by a bound in `Vec::<T, A>::drain`
[INFO] [stdout]    --> /rustc/e3feeb59cd1bdd011a2bfcc0747b55125d9b8527/library/alloc/src/vec/mod.rs:3047:4
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] Some errors have detailed explanations: E0554, E0658.
[INFO] [stdout] 
[INFO] [stdout] For more information about an error, try `rustc --explain E0554`.
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `string-alloc` (lib) due to 4 previous errors; 1 warning emitted
[INFO] running `Command { std: "docker" "inspect" "23e76f6398a43798c349a623bde475ef588d1f538a6aacbd6ed7823167034de1", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "23e76f6398a43798c349a623bde475ef588d1f538a6aacbd6ed7823167034de1", kill_on_drop: false }`
[INFO] [stdout] 23e76f6398a43798c349a623bde475ef588d1f538a6aacbd6ed7823167034de1
