[INFO] fetching crate disco 0.1.0...
[INFO] checking disco-0.1.0 against master#ceab6128fa48a616bfd3e3adf4bc80133b8ee223 for no-never-type-fallback
[INFO] extracting crate disco 0.1.0 into /workspace/builds/worker-5-tc1/source
[INFO] validating manifest of crates.io crate disco 0.1.0 on toolchain ceab6128fa48a616bfd3e3adf4bc80133b8ee223
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+ceab6128fa48a616bfd3e3adf4bc80133b8ee223" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking crates.io crate disco 0.1.0
[INFO] finished tweaking crates.io crate disco 0.1.0
[INFO] tweaked toml for crates.io crate disco 0.1.0 written to /workspace/builds/worker-5-tc1/source/Cargo.toml
[INFO] crate crates.io crate disco 0.1.0 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" "+ceab6128fa48a616bfd3e3adf4bc80133b8ee223" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Updating crates.io index
[INFO] [stderr]  Downloading crates ...
[INFO] [stderr]   Downloaded zeroize_derive v1.0.0
[INFO] [stderr]   Downloaded x25519-dalek v0.6.0
[INFO] [stderr]   Downloaded zeroize v1.1.0
[INFO] [stderr]   Downloaded subtle v2.2.2
[INFO] [stderr]   Downloaded sha2 v0.8.1
[INFO] [stderr]   Downloaded clear_on_drop v0.2.3
[INFO] [stderr]   Downloaded ed25519-dalek v1.0.0-pre.3
[INFO] [stderr]   Downloaded tiny-keccak v1.5.0
[INFO] [stderr]   Downloaded proc-macro2 v1.0.8
[INFO] [stderr]   Downloaded syn v1.0.15
[INFO] [stderr]   Downloaded curve25519-dalek v2.0.0
[INFO] [stderr]   Downloaded libc v0.2.67
[INFO] [stderr]   Downloaded strobe-rs v0.5.2
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-5-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-5-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@sha256:2788e3201cd34a07e3172128adcd8b3090168a8e3bcc40d7c032b9dda1df7d1c" "/opt/rustwide/cargo-home/bin/cargo" "+ceab6128fa48a616bfd3e3adf4bc80133b8ee223" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 0f3f77edf4fafd3fc93ef0d38c5954d913709d0fc938b1da84a90883e2517ca5
[INFO] running `Command { std: "docker" "start" "-a" "0f3f77edf4fafd3fc93ef0d38c5954d913709d0fc938b1da84a90883e2517ca5", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "0f3f77edf4fafd3fc93ef0d38c5954d913709d0fc938b1da84a90883e2517ca5", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "0f3f77edf4fafd3fc93ef0d38c5954d913709d0fc938b1da84a90883e2517ca5", kill_on_drop: false }`
[INFO] [stdout] 0f3f77edf4fafd3fc93ef0d38c5954d913709d0fc938b1da84a90883e2517ca5
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-5-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-5-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@sha256:2788e3201cd34a07e3172128adcd8b3090168a8e3bcc40d7c032b9dda1df7d1c" "/opt/rustwide/cargo-home/bin/cargo" "+ceab6128fa48a616bfd3e3adf4bc80133b8ee223" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 5058cf4ee8155376a36c33c1b17b5c5ae10e0fde53d7a9689e40d43ac4b5f9bf
[INFO] running `Command { std: "docker" "start" "-a" "5058cf4ee8155376a36c33c1b17b5c5ae10e0fde53d7a9689e40d43ac4b5f9bf", kill_on_drop: false }`
[INFO] [stderr]    Compiling proc-macro2 v1.0.8
[INFO] [stderr]    Compiling unicode-xid v0.2.0
[INFO] [stderr]    Compiling libc v0.2.67
[INFO] [stderr]    Compiling typenum v1.11.2
[INFO] [stderr]    Compiling getrandom v0.1.14
[INFO] [stderr]    Compiling syn v1.0.15
[INFO] [stderr]    Compiling byteorder v1.3.4
[INFO] [stderr]     Checking byte-tools v0.3.1
[INFO] [stderr]    Compiling cc v1.0.50
[INFO] [stderr]     Checking subtle v2.2.2
[INFO] [stderr]     Checking ppv-lite86 v0.2.6
[INFO] [stderr]     Checking block-padding v0.1.5
[INFO] [stderr]     Checking fake-simd v0.1.2
[INFO] [stderr]     Checking opaque-debug v0.2.3
[INFO] [stderr]     Checking tiny-keccak v1.5.0
[INFO] [stderr]     Checking c2-chacha v0.2.3
[INFO] [stderr]     Checking strobe-rs v0.5.2
[INFO] [stderr]    Compiling clear_on_drop v0.2.3
[INFO] [stderr]    Compiling quote v1.0.2
[INFO] [stderr]     Checking rand_core v0.5.1
[INFO] [stderr]     Checking rand_chacha v0.2.1
[INFO] [stderr]     Checking rand v0.7.3
[INFO] [stderr]     Checking generic-array v0.12.3
[INFO] [stderr]     Checking digest v0.8.1
[INFO] [stderr]     Checking block-buffer v0.7.3
[INFO] [stderr]     Checking sha2 v0.8.1
[INFO] [stderr]    Compiling synstructure v0.12.3
[INFO] [stderr]    Compiling zeroize_derive v1.0.0
[INFO] [stderr]     Checking zeroize v1.1.0
[INFO] [stderr]     Checking curve25519-dalek v2.0.0
[INFO] [stderr]     Checking ed25519-dalek v1.0.0-pre.3
[INFO] [stderr]     Checking x25519-dalek v0.6.0
[INFO] [stderr]     Checking disco v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: field `0` is never read
[INFO] [stdout]  --> examples/tcp.rs:7:11
[INFO] [stdout]   |
[INFO] [stdout] 7 |     Disco(ReadError),
[INFO] [stdout]   |     ----- ^^^^^^^^^
[INFO] [stdout]   |     |
[INFO] [stdout]   |     field in this variant
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] help: consider changing the field to be of unit type to suppress this warning while preserving the field numbering, or remove the field
[INFO] [stdout]   |
[INFO] [stdout] 7 |     Disco(()),
[INFO] [stdout]   |           ~~
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field `0` is never read
[INFO] [stdout]  --> examples/tcp.rs:8:8
[INFO] [stdout]   |
[INFO] [stdout] 8 |     Io(IoError),
[INFO] [stdout]   |     -- ^^^^^^^
[INFO] [stdout]   |     |
[INFO] [stdout]   |     field in this variant
[INFO] [stdout]   |
[INFO] [stdout] help: consider changing the field to be of unit type to suppress this warning while preserving the field numbering, or remove the field
[INFO] [stdout]   |
[INFO] [stdout] 8 |     Io(()),
[INFO] [stdout]   |        ~~
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field `0` is never read
[INFO] [stdout]  --> examples/tcp.rs:9:11
[INFO] [stdout]   |
[INFO] [stdout] 9 |     Parse(std::str::Utf8Error),
[INFO] [stdout]   |     ----- ^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]   |     |
[INFO] [stdout]   |     field in this variant
[INFO] [stdout]   |
[INFO] [stdout] help: consider changing the field to be of unit type to suppress this warning while preserving the field numbering, or remove the field
[INFO] [stdout]   |
[INFO] [stdout] 9 |     Parse(()),
[INFO] [stdout]   |           ~~
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 3 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished `dev` profile [unoptimized + debuginfo] target(s) in 3.66s
[INFO] running `Command { std: "docker" "inspect" "5058cf4ee8155376a36c33c1b17b5c5ae10e0fde53d7a9689e40d43ac4b5f9bf", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "5058cf4ee8155376a36c33c1b17b5c5ae10e0fde53d7a9689e40d43ac4b5f9bf", kill_on_drop: false }`
[INFO] [stdout] 5058cf4ee8155376a36c33c1b17b5c5ae10e0fde53d7a9689e40d43ac4b5f9bf
[INFO] checking disco-0.1.0 against try#3a4bc97f6385a3aa300a4fd689b44350e54fd676 for no-never-type-fallback
[INFO] extracting crate disco 0.1.0 into /workspace/builds/worker-5-tc2/source
[INFO] validating manifest of crates.io crate disco 0.1.0 on toolchain 3a4bc97f6385a3aa300a4fd689b44350e54fd676
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+3a4bc97f6385a3aa300a4fd689b44350e54fd676" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking crates.io crate disco 0.1.0
[INFO] finished tweaking crates.io crate disco 0.1.0
[INFO] tweaked toml for crates.io crate disco 0.1.0 written to /workspace/builds/worker-5-tc2/source/Cargo.toml
[INFO] crate crates.io crate disco 0.1.0 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" "+3a4bc97f6385a3aa300a4fd689b44350e54fd676" "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/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-5-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@sha256:2788e3201cd34a07e3172128adcd8b3090168a8e3bcc40d7c032b9dda1df7d1c" "/opt/rustwide/cargo-home/bin/cargo" "+3a4bc97f6385a3aa300a4fd689b44350e54fd676" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 0bc6337e014e92545d9a5d1b8bc80b26f52620737ab66356348606377b237bab
[INFO] running `Command { std: "docker" "start" "-a" "0bc6337e014e92545d9a5d1b8bc80b26f52620737ab66356348606377b237bab", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "0bc6337e014e92545d9a5d1b8bc80b26f52620737ab66356348606377b237bab", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "0bc6337e014e92545d9a5d1b8bc80b26f52620737ab66356348606377b237bab", kill_on_drop: false }`
[INFO] [stdout] 0bc6337e014e92545d9a5d1b8bc80b26f52620737ab66356348606377b237bab
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-5-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-5-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@sha256:2788e3201cd34a07e3172128adcd8b3090168a8e3bcc40d7c032b9dda1df7d1c" "/opt/rustwide/cargo-home/bin/cargo" "+3a4bc97f6385a3aa300a4fd689b44350e54fd676" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 9cb769d37673dbfc6b4e35ec12ceb122ad6054cc46a522d12e06f3c69df8f839
[INFO] running `Command { std: "docker" "start" "-a" "9cb769d37673dbfc6b4e35ec12ceb122ad6054cc46a522d12e06f3c69df8f839", kill_on_drop: false }`
[INFO] [stderr]    Compiling proc-macro2 v1.0.8
[INFO] [stderr]    Compiling libc v0.2.67
[INFO] [stderr]    Compiling typenum v1.11.2
[INFO] [stderr]    Compiling unicode-xid v0.2.0
[INFO] [stderr]    Compiling byteorder v1.3.4
[INFO] [stderr]    Compiling getrandom v0.1.14
[INFO] [stderr]    Compiling syn v1.0.15
[INFO] [stderr]     Checking ppv-lite86 v0.2.6
[INFO] [stderr]     Checking byte-tools v0.3.1
[INFO] [stderr]     Checking subtle v2.2.2
[INFO] [stderr]    Compiling cc v1.0.50
[INFO] [stderr]     Checking block-padding v0.1.5
[INFO] [stderr]     Checking c2-chacha v0.2.3
[INFO] [stderr]     Checking opaque-debug v0.2.3
[INFO] [stderr]     Checking fake-simd v0.1.2
[INFO] [stderr]     Checking tiny-keccak v1.5.0
[INFO] [stderr]     Checking strobe-rs v0.5.2
[INFO] [stderr]    Compiling quote v1.0.2
[INFO] [stderr]     Checking rand_core v0.5.1
[INFO] [stderr]    Compiling clear_on_drop v0.2.3
[INFO] [stderr]     Checking rand_chacha v0.2.1
[INFO] [stderr]     Checking generic-array v0.12.3
[INFO] [stderr]     Checking rand v0.7.3
[INFO] [stderr]     Checking digest v0.8.1
[INFO] [stderr]     Checking block-buffer v0.7.3
[INFO] [stderr]     Checking sha2 v0.8.1
[INFO] [stderr]    Compiling synstructure v0.12.3
[INFO] [stderr]    Compiling zeroize_derive v1.0.0
[INFO] [stderr]     Checking zeroize v1.1.0
[INFO] [stderr]     Checking curve25519-dalek v2.0.0
[INFO] [stderr]     Checking x25519-dalek v0.6.0
[INFO] [stderr]     Checking ed25519-dalek v1.0.0-pre.3
[INFO] [stdout] error[E0282]: type annotations needed
[INFO] [stdout]    --> /opt/rustwide/cargo-home/registry/src/index.crates.io-6f17d22bba15001f/ed25519-dalek-1.0.0-pre.3/src/signature.rs:105:5
[INFO] [stdout]     |
[INFO] [stdout] 105 | /     match Scalar::from_canonical_bytes(bytes) {
[INFO] [stdout] 106 | |         None => return Err(SignatureError(InternalError::ScalarFormatError)),
[INFO] [stdout] 107 | |         Some(x) => return Ok(x),
[INFO] [stdout] 108 | |     };
[INFO] [stdout]     | |_____^ cannot infer type
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: aborting due to 1 previous error
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] For more information about this error, try `rustc --explain E0282`.
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `ed25519-dalek` (lib) due to 2 previous errors
[INFO] running `Command { std: "docker" "inspect" "9cb769d37673dbfc6b4e35ec12ceb122ad6054cc46a522d12e06f3c69df8f839", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "9cb769d37673dbfc6b4e35ec12ceb122ad6054cc46a522d12e06f3c69df8f839", kill_on_drop: false }`
[INFO] [stdout] 9cb769d37673dbfc6b4e35ec12ceb122ad6054cc46a522d12e06f3c69df8f839