[INFO] cloning repository https://github.com/tatref/mem
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/tatref/mem" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Ftatref%2Fmem", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Ftatref%2Fmem'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 4253fc7070d62ae0268df66904488c8330a15d72
[INFO] checking tatref/mem against master#ceab6128fa48a616bfd3e3adf4bc80133b8ee223 for no-never-type-fallback
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Ftatref%2Fmem" "/workspace/builds/worker-1-tc1/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-1-tc1/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/tatref/mem 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 git repo https://github.com/tatref/mem
[INFO] finished tweaking git repo https://github.com/tatref/mem
[INFO] tweaked toml for git repo https://github.com/tatref/mem written to /workspace/builds/worker-1-tc1/source/Cargo.toml
[INFO] crate git repo https://github.com/tatref/mem 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]  Downloading crates ...
[INFO] [stderr]   Downloaded utf8-ranges v1.0.3
[INFO] [stderr]   Downloaded aho-corasick v0.7.4
[INFO] [stderr]   Downloaded regex-syntax v0.6.8
[INFO] [stderr]   Downloaded libc v0.2.59
[INFO] [stderr]   Downloaded regex v1.1.9
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-1-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-1-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] b28f95d89f01c9adf1d4e42e2a197c25ed2ea72f2be72c8c1ac1e4625854379a
[INFO] running `Command { std: "docker" "start" "-a" "b28f95d89f01c9adf1d4e42e2a197c25ed2ea72f2be72c8c1ac1e4625854379a", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "b28f95d89f01c9adf1d4e42e2a197c25ed2ea72f2be72c8c1ac1e4625854379a", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "b28f95d89f01c9adf1d4e42e2a197c25ed2ea72f2be72c8c1ac1e4625854379a", kill_on_drop: false }`
[INFO] [stdout] b28f95d89f01c9adf1d4e42e2a197c25ed2ea72f2be72c8c1ac1e4625854379a
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-1-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-1-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] 24df2ab7c31c5e7accc7f833395695cacd26ee84deeacedf6769697ed9d62be7
[INFO] running `Command { std: "docker" "start" "-a" "24df2ab7c31c5e7accc7f833395695cacd26ee84deeacedf6769697ed9d62be7", kill_on_drop: false }`
[INFO] [stderr]    Compiling libc v0.2.59
[INFO] [stderr]    Compiling regex v1.1.9
[INFO] [stderr]     Checking ucd-util v0.1.3
[INFO] [stderr]     Checking aho-corasick v0.7.4
[INFO] [stderr]     Checking utf8-ranges v1.0.3
[INFO] [stderr]     Checking thread_local v0.3.6
[INFO] [stderr]     Checking regex-syntax v0.6.8
[INFO] [stderr]     Checking memprocreader v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: fields `r`, `w`, `x`, `s`, and `p` are never read
[INFO] [stdout]   --> src/lib.rs:34:5
[INFO] [stdout]    |
[INFO] [stdout] 33 | struct Permissions {
[INFO] [stdout]    |        ----------- fields in this struct
[INFO] [stdout] 34 |     r: bool,
[INFO] [stdout]    |     ^
[INFO] [stdout] 35 |     w: bool,
[INFO] [stdout]    |     ^
[INFO] [stdout] 36 |     x: bool,
[INFO] [stdout]    |     ^
[INFO] [stdout] 37 |     s: bool,
[INFO] [stdout]    |     ^
[INFO] [stdout] 38 |     p: bool,
[INFO] [stdout]    |     ^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `Permissions` has derived impls for the traits `Clone` and `Debug`, but these are intentionally ignored during dead code analysis
[INFO] [stdout]    = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: fields `major` and `minor` are never read
[INFO] [stdout]   --> src/lib.rs:65:5
[INFO] [stdout]    |
[INFO] [stdout] 64 | struct Device {
[INFO] [stdout]    |        ------ fields in this struct
[INFO] [stdout] 65 |     major: u32,
[INFO] [stdout]    |     ^^^^^
[INFO] [stdout] 66 |     minor: u32,
[INFO] [stdout]    |     ^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `Device` has derived impls for the traits `Clone` and `Debug`, but these are intentionally ignored during dead code analysis
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: fields `permissions`, `offset`, `device`, and `inode` are never read
[INFO] [stdout]   --> src/lib.rs:86:5
[INFO] [stdout]    |
[INFO] [stdout] 84 | struct MappedMemoryRegionMetadata {
[INFO] [stdout]    |        -------------------------- fields in this struct
[INFO] [stdout] 85 |     address: Address,
[INFO] [stdout] 86 |     permissions: Permissions,
[INFO] [stdout]    |     ^^^^^^^^^^^
[INFO] [stdout] 87 |     offset: u64,
[INFO] [stdout]    |     ^^^^^^
[INFO] [stdout] 88 |     device: Device,
[INFO] [stdout]    |     ^^^^^^
[INFO] [stdout] 89 |     inode: u64,
[INFO] [stdout]    |     ^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `MappedMemoryRegionMetadata` has derived impls for the traits `Clone` and `Debug`, but these are intentionally ignored during dead code analysis
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: fields `r`, `w`, `x`, `s`, and `p` are never read
[INFO] [stdout]   --> src/lib.rs:34:5
[INFO] [stdout]    |
[INFO] [stdout] 33 | struct Permissions {
[INFO] [stdout]    |        ----------- fields in this struct
[INFO] [stdout] 34 |     r: bool,
[INFO] [stdout]    |     ^
[INFO] [stdout] 35 |     w: bool,
[INFO] [stdout]    |     ^
[INFO] [stdout] 36 |     x: bool,
[INFO] [stdout]    |     ^
[INFO] [stdout] 37 |     s: bool,
[INFO] [stdout]    |     ^
[INFO] [stdout] 38 |     p: bool,
[INFO] [stdout]    |     ^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `Permissions` has derived impls for the traits `Clone` and `Debug`, but these are intentionally ignored during dead code analysis
[INFO] [stdout]    = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: fields `major` and `minor` are never read
[INFO] [stdout]   --> src/lib.rs:65:5
[INFO] [stdout]    |
[INFO] [stdout] 64 | struct Device {
[INFO] [stdout]    |        ------ fields in this struct
[INFO] [stdout] 65 |     major: u32,
[INFO] [stdout]    |     ^^^^^
[INFO] [stdout] 66 |     minor: u32,
[INFO] [stdout]    |     ^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `Device` has derived impls for the traits `Clone` and `Debug`, but these are intentionally ignored during dead code analysis
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: fields `permissions`, `offset`, `device`, and `inode` are never read
[INFO] [stdout]   --> src/lib.rs:86:5
[INFO] [stdout]    |
[INFO] [stdout] 84 | struct MappedMemoryRegionMetadata {
[INFO] [stdout]    |        -------------------------- fields in this struct
[INFO] [stdout] 85 |     address: Address,
[INFO] [stdout] 86 |     permissions: Permissions,
[INFO] [stdout]    |     ^^^^^^^^^^^
[INFO] [stdout] 87 |     offset: u64,
[INFO] [stdout]    |     ^^^^^^
[INFO] [stdout] 88 |     device: Device,
[INFO] [stdout]    |     ^^^^^^
[INFO] [stdout] 89 |     inode: u64,
[INFO] [stdout]    |     ^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `MappedMemoryRegionMetadata` has derived impls for the traits `Clone` and `Debug`, but these are intentionally ignored during dead code analysis
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 3 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 3 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished `dev` profile [unoptimized + debuginfo] target(s) in 1.78s
[INFO] running `Command { std: "docker" "inspect" "24df2ab7c31c5e7accc7f833395695cacd26ee84deeacedf6769697ed9d62be7", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "24df2ab7c31c5e7accc7f833395695cacd26ee84deeacedf6769697ed9d62be7", kill_on_drop: false }`
[INFO] [stdout] 24df2ab7c31c5e7accc7f833395695cacd26ee84deeacedf6769697ed9d62be7
[INFO] checking tatref/mem against try#3a4bc97f6385a3aa300a4fd689b44350e54fd676 for no-never-type-fallback
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Ftatref%2Fmem" "/workspace/builds/worker-1-tc2/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-1-tc2/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/tatref/mem 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 git repo https://github.com/tatref/mem
[INFO] finished tweaking git repo https://github.com/tatref/mem
[INFO] tweaked toml for git repo https://github.com/tatref/mem written to /workspace/builds/worker-1-tc2/source/Cargo.toml
[INFO] crate git repo https://github.com/tatref/mem 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-1-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-1-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] a84f39bdb88d3e940a2e4c4992bb6759b0f4b17fdbf83b00277c7fc07141106f
[INFO] running `Command { std: "docker" "start" "-a" "a84f39bdb88d3e940a2e4c4992bb6759b0f4b17fdbf83b00277c7fc07141106f", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "a84f39bdb88d3e940a2e4c4992bb6759b0f4b17fdbf83b00277c7fc07141106f", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "a84f39bdb88d3e940a2e4c4992bb6759b0f4b17fdbf83b00277c7fc07141106f", kill_on_drop: false }`
[INFO] [stdout] a84f39bdb88d3e940a2e4c4992bb6759b0f4b17fdbf83b00277c7fc07141106f
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-1-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-1-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] e50f88ed60103498f6327794651bb1a6632a7d537debe2649ce08910ca588fbe
[INFO] running `Command { std: "docker" "start" "-a" "e50f88ed60103498f6327794651bb1a6632a7d537debe2649ce08910ca588fbe", kill_on_drop: false }`
[INFO] [stderr]     Checking ucd-util v0.1.3
[INFO] [stderr]    Compiling regex v1.1.9
[INFO] [stderr]    Compiling libc v0.2.59
[INFO] [stderr]     Checking utf8-ranges v1.0.3
[INFO] [stderr]     Checking thread_local v0.3.6
[INFO] [stderr]     Checking aho-corasick v0.7.4
[INFO] [stderr]     Checking regex-syntax v0.6.8
[INFO] [stdout] error[E0282]: type annotations needed
[INFO] [stdout]    --> /opt/rustwide/cargo-home/registry/src/index.crates.io-6f17d22bba15001f/regex-1.1.9/src/exec.rs:795:13
[INFO] [stdout]     |
[INFO] [stdout] 795 | /             match dfa::Fsm::reverse(
[INFO] [stdout] 796 | |                 &self.ro.dfa_reverse,
[INFO] [stdout] 797 | |                 self.cache,
[INFO] [stdout] 798 | |                 false,
[INFO] [stdout] ...   |
[INFO] [stdout] 809 | |                 Quit => return Some(Quit),
[INFO] [stdout] 810 | |             };
[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] running `Command { std: "docker" "inspect" "e50f88ed60103498f6327794651bb1a6632a7d537debe2649ce08910ca588fbe", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "e50f88ed60103498f6327794651bb1a6632a7d537debe2649ce08910ca588fbe", kill_on_drop: false }`
[INFO] [stdout] e50f88ed60103498f6327794651bb1a6632a7d537debe2649ce08910ca588fbe