[INFO] fetching crate meap 0.8.1...
[INFO] checking meap-0.8.1 against master#ceab6128fa48a616bfd3e3adf4bc80133b8ee223 for no-never-type-fallback
[INFO] extracting crate meap 0.8.1 into /workspace/builds/worker-7-tc1/source
[INFO] validating manifest of crates.io crate meap 0.8.1 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 meap 0.8.1
[INFO] removed 0 missing examples
[INFO] finished tweaking crates.io crate meap 0.8.1
[INFO] tweaked toml for crates.io crate meap 0.8.1 written to /workspace/builds/worker-7-tc1/source/Cargo.toml
[INFO] crate crates.io crate meap 0.8.1 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 parse_duration v2.1.1
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-7-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-7-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] d5e22ba32745b212d1078189e0f60f81f6a3b63f4ca59bdc9281eebffd0c1968
[INFO] running `Command { std: "docker" "start" "-a" "d5e22ba32745b212d1078189e0f60f81f6a3b63f4ca59bdc9281eebffd0c1968", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "d5e22ba32745b212d1078189e0f60f81f6a3b63f4ca59bdc9281eebffd0c1968", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "d5e22ba32745b212d1078189e0f60f81f6a3b63f4ca59bdc9281eebffd0c1968", kill_on_drop: false }`
[INFO] [stdout] d5e22ba32745b212d1078189e0f60f81f6a3b63f4ca59bdc9281eebffd0c1968
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-7-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-7-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] 33239aa239867afd9c2e8ebafa67b45d6294a6edfdec771ff2dc142e883dae71
[INFO] running `Command { std: "docker" "start" "-a" "33239aa239867afd9c2e8ebafa67b45d6294a6edfdec771ff2dc142e883dae71", kill_on_drop: false }`
[INFO] [stderr]    Compiling num-traits v0.2.15
[INFO] [stderr]    Compiling num-integer v0.1.45
[INFO] [stderr]    Compiling num-bigint v0.2.6
[INFO] [stderr]    Compiling num-complex v0.2.4
[INFO] [stderr]    Compiling num-rational v0.2.4
[INFO] [stderr]    Compiling num-iter v0.1.43
[INFO] [stderr]     Checking regex-syntax v0.6.27
[INFO] [stderr]     Checking aho-corasick v0.7.19
[INFO] [stderr]     Checking meap v0.8.1 (/opt/rustwide/workdir)
[INFO] [stderr]     Checking regex v1.6.0
[INFO] [stderr]     Checking num v0.2.1
[INFO] [stderr]     Checking parse_duration v2.1.1
[INFO] [stdout] warning: field `0` is never read
[INFO] [stdout]  --> examples/map_opt.rs:3:7
[INFO] [stdout]   |
[INFO] [stdout] 3 |     A(String),
[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] 3 |     A(()),
[INFO] [stdout]   |       ~~
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field `0` is never read
[INFO] [stdout]  --> examples/map_opt.rs:4:7
[INFO] [stdout]   |
[INFO] [stdout] 4 |     B(String),
[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] 4 |     B(()),
[INFO] [stdout]   |       ~~
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 2 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: fields `int`, `string`, `durations`, `flag`, `flag_count`, and `colour` are never read
[INFO] [stdout]   --> examples/macro.rs:30:5
[INFO] [stdout]    |
[INFO] [stdout] 29 | struct Args {
[INFO] [stdout]    |        ---- fields in this struct
[INFO] [stdout] 30 |     int: i32,
[INFO] [stdout]    |     ^^^
[INFO] [stdout] 31 |     string: String,
[INFO] [stdout]    |     ^^^^^^
[INFO] [stdout] 32 |     durations: Vec<Duration>,
[INFO] [stdout]    |     ^^^^^^^^^
[INFO] [stdout] 33 |     flag: bool,
[INFO] [stdout]    |     ^^^^
[INFO] [stdout] 34 |     flag_count: usize,
[INFO] [stdout]    |     ^^^^^^^^^^
[INFO] [stdout] 35 |     colour: Colour,
[INFO] [stdout]    |     ^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `Args` has a derived impl for the trait `Debug`, but this is intentionally ignored during dead code analysis
[INFO] [stdout]    = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 1 warning emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished `dev` profile [unoptimized + debuginfo] target(s) in 1.69s
[INFO] running `Command { std: "docker" "inspect" "33239aa239867afd9c2e8ebafa67b45d6294a6edfdec771ff2dc142e883dae71", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "33239aa239867afd9c2e8ebafa67b45d6294a6edfdec771ff2dc142e883dae71", kill_on_drop: false }`
[INFO] [stdout] 33239aa239867afd9c2e8ebafa67b45d6294a6edfdec771ff2dc142e883dae71
[INFO] checking meap-0.8.1 against try#3a4bc97f6385a3aa300a4fd689b44350e54fd676 for no-never-type-fallback
[INFO] extracting crate meap 0.8.1 into /workspace/builds/worker-7-tc2/source
[INFO] validating manifest of crates.io crate meap 0.8.1 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 meap 0.8.1
[INFO] removed 0 missing examples
[INFO] finished tweaking crates.io crate meap 0.8.1
[INFO] tweaked toml for crates.io crate meap 0.8.1 written to /workspace/builds/worker-7-tc2/source/Cargo.toml
[INFO] crate crates.io crate meap 0.8.1 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-7-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-7-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] 2b549bb696565d8541c1c711497d3697ed477e003d18284110561305339bd1d6
[INFO] running `Command { std: "docker" "start" "-a" "2b549bb696565d8541c1c711497d3697ed477e003d18284110561305339bd1d6", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "2b549bb696565d8541c1c711497d3697ed477e003d18284110561305339bd1d6", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "2b549bb696565d8541c1c711497d3697ed477e003d18284110561305339bd1d6", kill_on_drop: false }`
[INFO] [stdout] 2b549bb696565d8541c1c711497d3697ed477e003d18284110561305339bd1d6
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-7-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-7-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] a8886be438ee64e04fd66f4b41c4e2c280ff1c104ca2c4ee88c69ad380cbfe34
[INFO] running `Command { std: "docker" "start" "-a" "a8886be438ee64e04fd66f4b41c4e2c280ff1c104ca2c4ee88c69ad380cbfe34", kill_on_drop: false }`
[INFO] [stderr]    Compiling num-traits v0.2.15
[INFO] [stderr]    Compiling num-integer v0.1.45
[INFO] [stderr]    Compiling num-bigint v0.2.6
[INFO] [stderr]    Compiling num-complex v0.2.4
[INFO] [stderr]    Compiling num-iter v0.1.43
[INFO] [stderr]    Compiling num-rational v0.2.4
[INFO] [stderr]     Checking regex-syntax v0.6.27
[INFO] [stderr]    Compiling memchr v2.5.0
[INFO] [stderr]     Checking lazy_static v1.4.0
[INFO] [stderr]     Checking meap v0.8.1 (/opt/rustwide/workdir)
[INFO] [stderr]     Checking aho-corasick v0.7.19
[INFO] [stderr]     Checking regex v1.6.0
[INFO] [stdout] error[E0282]: type annotations needed
[INFO] [stdout]    --> /opt/rustwide/cargo-home/registry/src/index.crates.io-6f17d22bba15001f/regex-1.6.0/src/exec.rs:848:13
[INFO] [stdout]     |
[INFO] [stdout] 848 | /             match dfa::Fsm::reverse(
[INFO] [stdout] 849 | |                 &self.ro.dfa_reverse,
[INFO] [stdout] 850 | |                 self.cache.value(),
[INFO] [stdout] 851 | |                 false,
[INFO] [stdout] ...   |
[INFO] [stdout] 862 | |                 Quit => return Some(Quit),
[INFO] [stdout] 863 | |             };
[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 `regex` (lib) due to 2 previous errors
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[INFO] running `Command { std: "docker" "inspect" "a8886be438ee64e04fd66f4b41c4e2c280ff1c104ca2c4ee88c69ad380cbfe34", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "a8886be438ee64e04fd66f4b41c4e2c280ff1c104ca2c4ee88c69ad380cbfe34", kill_on_drop: false }`
[INFO] [stdout] a8886be438ee64e04fd66f4b41c4e2c280ff1c104ca2c4ee88c69ad380cbfe34