[INFO] cloning repository https://github.com/matklad/thrench
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/matklad/thrench" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fmatklad%2Fthrench", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fmatklad%2Fthrench'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] b2bdf941a5f1d0863ab28522e1fe0e303ba20cd5
[INFO] checking matklad/thrench against master#ceab6128fa48a616bfd3e3adf4bc80133b8ee223 for no-never-type-fallback
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fmatklad%2Fthrench" "/workspace/builds/worker-6-tc1/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-6-tc1/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/matklad/thrench 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/matklad/thrench
[INFO] finished tweaking git repo https://github.com/matklad/thrench
[INFO] tweaked toml for git repo https://github.com/matklad/thrench written to /workspace/builds/worker-6-tc1/source/Cargo.toml
[INFO] crate git repo https://github.com/matklad/thrench 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 lazycell v0.4.0
[INFO] [stderr]   Downloaded miow v0.2.0
[INFO] [stderr]   Downloaded mio v0.6.4
[INFO] [stderr]   Downloaded term_size v0.2.2
[INFO] [stderr]   Downloaded net2 v0.2.26
[INFO] [stderr]   Downloaded tokio-proto v0.1.0
[INFO] [stderr]   Downloaded clap v2.20.4
[INFO] [stderr]   Downloaded tokio-core v0.1.4
[INFO] [stderr]   Downloaded futures v0.1.10
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-6-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-6-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] 2ff10f1ebc46f1df4794090731ff4d64a1108a679e049d21e532818e3a284565
[INFO] running `Command { std: "docker" "start" "-a" "2ff10f1ebc46f1df4794090731ff4d64a1108a679e049d21e532818e3a284565", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "2ff10f1ebc46f1df4794090731ff4d64a1108a679e049d21e532818e3a284565", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "2ff10f1ebc46f1df4794090731ff4d64a1108a679e049d21e532818e3a284565", kill_on_drop: false }`
[INFO] [stdout] 2ff10f1ebc46f1df4794090731ff4d64a1108a679e049d21e532818e3a284565
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-6-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-6-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] ee721450a8554332dfa0905427833245a0fe33061e7f779337fc3d6947f2e231
[INFO] running `Command { std: "docker" "start" "-a" "ee721450a8554332dfa0905427833245a0fe33061e7f779337fc3d6947f2e231", kill_on_drop: false }`
[INFO] [stderr]     Checking libc v0.2.20
[INFO] [stderr]     Checking lazycell v0.4.0
[INFO] [stderr]     Checking slab v0.3.0
[INFO] [stderr]     Checking scoped-tls v0.1.0
[INFO] [stderr]     Checking unicode-width v0.1.4
[INFO] [stderr]     Checking unicode-segmentation v1.1.0
[INFO] [stderr]     Checking smallvec v0.2.1
[INFO] [stderr]     Checking strsim v0.6.0
[INFO] [stderr]     Checking take v0.1.0
[INFO] [stderr]     Checking vec_map v0.6.0
[INFO] [stderr]     Checking ansi_term v0.9.0
[INFO] [stderr]     Checking futures v0.1.10
[INFO] [stderr]     Checking byteorder v1.0.0
[INFO] [stderr]     Checking net2 v0.2.26
[INFO] [stderr]     Checking rand v0.3.15
[INFO] [stderr]     Checking num_cpus v1.2.1
[INFO] [stderr]     Checking term_size v0.2.2
[INFO] [stderr]     Checking clap v2.20.4
[INFO] [stderr]     Checking mio v0.6.4
[INFO] [stderr]     Checking tokio-service v0.1.0
[INFO] [stderr]     Checking deque v0.3.1
[INFO] [stderr]     Checking rayon v0.6.0
[INFO] [stderr]     Checking tokio-core v0.1.4
[INFO] [stderr]     Checking tokio-proto v0.1.0
[INFO] [stderr]     Checking thrench v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: unused import: `std::str`
[INFO] [stdout]  --> src/bin/fut.rs:9:5
[INFO] [stdout]   |
[INFO] [stdout] 9 | use std::str;
[INFO] [stdout]   |     ^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `std::str`
[INFO] [stdout]  --> src/bin/fut.rs:9:5
[INFO] [stdout]   |
[INFO] [stdout] 9 | use std::str;
[INFO] [stdout]   |     ^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 1 warning emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 1 warning emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished `dev` profile [unoptimized + debuginfo] target(s) in 1.52s
[INFO] running `Command { std: "docker" "inspect" "ee721450a8554332dfa0905427833245a0fe33061e7f779337fc3d6947f2e231", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "ee721450a8554332dfa0905427833245a0fe33061e7f779337fc3d6947f2e231", kill_on_drop: false }`
[INFO] [stdout] ee721450a8554332dfa0905427833245a0fe33061e7f779337fc3d6947f2e231
[INFO] checking matklad/thrench against try#3a4bc97f6385a3aa300a4fd689b44350e54fd676 for no-never-type-fallback
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fmatklad%2Fthrench" "/workspace/builds/worker-6-tc2/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-6-tc2/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/matklad/thrench 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/matklad/thrench
[INFO] finished tweaking git repo https://github.com/matklad/thrench
[INFO] tweaked toml for git repo https://github.com/matklad/thrench written to /workspace/builds/worker-6-tc2/source/Cargo.toml
[INFO] crate git repo https://github.com/matklad/thrench 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-6-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-6-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] 2b7e0cfc098ce1c2d254055e994705387175e16f64e27f5af5d0e9e872f8a8ee
[INFO] running `Command { std: "docker" "start" "-a" "2b7e0cfc098ce1c2d254055e994705387175e16f64e27f5af5d0e9e872f8a8ee", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "2b7e0cfc098ce1c2d254055e994705387175e16f64e27f5af5d0e9e872f8a8ee", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "2b7e0cfc098ce1c2d254055e994705387175e16f64e27f5af5d0e9e872f8a8ee", kill_on_drop: false }`
[INFO] [stdout] 2b7e0cfc098ce1c2d254055e994705387175e16f64e27f5af5d0e9e872f8a8ee
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-6-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-6-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] 016f48154d5c84da9301101eda60b11385725bf9d9162bc9b1418840dd15bee1
[INFO] running `Command { std: "docker" "start" "-a" "016f48154d5c84da9301101eda60b11385725bf9d9162bc9b1418840dd15bee1", kill_on_drop: false }`
[INFO] [stderr]     Checking libc v0.2.20
[INFO] [stderr]     Checking futures v0.1.10
[INFO] [stderr]     Checking slab v0.3.0
[INFO] [stderr]     Checking lazycell v0.4.0
[INFO] [stderr]     Checking scoped-tls v0.1.0
[INFO] [stderr]     Checking unicode-width v0.1.4
[INFO] [stderr]     Checking smallvec v0.2.1
[INFO] [stderr]     Checking ansi_term v0.9.0
[INFO] [stderr]     Checking unicode-segmentation v1.1.0
[INFO] [stderr]     Checking strsim v0.6.0
[INFO] [stderr]     Checking vec_map v0.6.0
[INFO] [stderr]     Checking take v0.1.0
[INFO] [stderr]     Checking byteorder v1.0.0
[INFO] [stderr]     Checking net2 v0.2.26
[INFO] [stderr]     Checking rand v0.3.15
[INFO] [stderr]     Checking term_size v0.2.2
[INFO] [stderr]     Checking num_cpus v1.2.1
[INFO] [stderr]     Checking clap v2.20.4
[INFO] [stderr]     Checking mio v0.6.4
[INFO] [stderr]     Checking deque v0.3.1
[INFO] [stderr]     Checking tokio-service v0.1.0
[INFO] [stderr]     Checking rayon v0.6.0
[INFO] [stderr]     Checking tokio-core v0.1.4
[INFO] [stderr]     Checking tokio-proto v0.1.0
[INFO] [stderr]     Checking thrench v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: unused import: `std::str`
[INFO] [stdout]  --> src/bin/fut.rs:9:5
[INFO] [stdout]   |
[INFO] [stdout] 9 | use std::str;
[INFO] [stdout]   |     ^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `std::str`
[INFO] [stdout]  --> src/bin/fut.rs:9:5
[INFO] [stdout]   |
[INFO] [stdout] 9 | use std::str;
[INFO] [stdout]   |     ^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0283]: type annotations needed
[INFO] [stdout]   --> src/bin/threads.rs:31:19
[INFO] [stdout]    |
[INFO] [stdout] 31 |     thread::spawn(move || {
[INFO] [stdout]    |                   ^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: cannot satisfy `_: Send`
[INFO] [stdout] note: required by a bound in `spawn`
[INFO] [stdout]   --> /rustc/3a4bc97f6385a3aa300a4fd689b44350e54fd676/library/std/src/thread/mod.rs:672:1
[INFO] [stdout] help: try giving this closure an explicit return type
[INFO] [stdout]    |
[INFO] [stdout] 31 |     thread::spawn(move || -> /* Type */ {
[INFO] [stdout]    |                           +++++++++++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0283]: type annotations needed
[INFO] [stdout]   --> src/bin/threads.rs:31:19
[INFO] [stdout]    |
[INFO] [stdout] 31 |     thread::spawn(move || {
[INFO] [stdout]    |                   ^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: cannot satisfy `_: Send`
[INFO] [stdout] note: required by a bound in `spawn`
[INFO] [stdout]   --> /rustc/3a4bc97f6385a3aa300a4fd689b44350e54fd676/library/std/src/thread/mod.rs:672:1
[INFO] [stdout] help: try giving this closure an explicit return type
[INFO] [stdout]    |
[INFO] [stdout] 31 |     thread::spawn(move || -> /* Type */ {
[INFO] [stdout]    |                           +++++++++++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0283]: type annotations needed
[INFO] [stdout]   --> src/bin/threads.rs:49:16
[INFO] [stdout]    |
[INFO] [stdout] 49 |         .spawn(move || {
[INFO] [stdout]    |          ----- ^^^^^^^
[INFO] [stdout]    |          |
[INFO] [stdout]    |          type must be known at this point
[INFO] [stdout]    |
[INFO] [stdout]    = note: cannot satisfy `_: Send`
[INFO] [stdout] note: required by a bound in `Builder::spawn`
[INFO] [stdout]   --> /rustc/3a4bc97f6385a3aa300a4fd689b44350e54fd676/library/std/src/thread/mod.rs:381:5
[INFO] [stdout] help: try giving this closure an explicit return type
[INFO] [stdout]    |
[INFO] [stdout] 49 |         .spawn(move || -> /* Type */ {
[INFO] [stdout]    |                        +++++++++++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0283]: type annotations needed
[INFO] [stdout]   --> src/bin/threads.rs:49:16
[INFO] [stdout]    |
[INFO] [stdout] 49 |         .spawn(move || {
[INFO] [stdout]    |          ----- ^^^^^^^
[INFO] [stdout]    |          |
[INFO] [stdout]    |          type must be known at this point
[INFO] [stdout]    |
[INFO] [stdout]    = note: cannot satisfy `_: Send`
[INFO] [stdout] note: required by a bound in `Builder::spawn`
[INFO] [stdout]   --> /rustc/3a4bc97f6385a3aa300a4fd689b44350e54fd676/library/std/src/thread/mod.rs:381:5
[INFO] [stdout] help: try giving this closure an explicit return type
[INFO] [stdout]    |
[INFO] [stdout] 49 |         .spawn(move || -> /* Type */ {
[INFO] [stdout]    |                        +++++++++++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: aborting due to 2 previous errors
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] For more information about this error, try `rustc --explain E0283`.
[INFO] [stdout] 
[INFO] [stdout] error: aborting due to 2 previous errors
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] For more information about this error, try `rustc --explain E0283`.
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `thrench` (bin "threads") due to 3 previous errors
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[INFO] [stderr] error: could not compile `thrench` (bin "threads" test) due to 3 previous errors
[INFO] [stdout] warning: 1 warning emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 1 warning emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] running `Command { std: "docker" "inspect" "016f48154d5c84da9301101eda60b11385725bf9d9162bc9b1418840dd15bee1", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "016f48154d5c84da9301101eda60b11385725bf9d9162bc9b1418840dd15bee1", kill_on_drop: false }`
[INFO] [stdout] 016f48154d5c84da9301101eda60b11385725bf9d9162bc9b1418840dd15bee1