[INFO] fetching crate slice 0.0.4...
[INFO] testing slice-0.0.4 against beta-2021-08-01 for beta-1.55-1
[INFO] extracting crate slice 0.0.4 into /workspace/builds/worker-67/source
[INFO] validating manifest of crates.io crate slice 0.0.4 on toolchain beta-2021-08-01
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+beta-2021-08-01" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking crates.io crate slice 0.0.4
[INFO] finished tweaking crates.io crate slice 0.0.4
[INFO] tweaked toml for crates.io crate slice 0.0.4 written to /workspace/builds/worker-67/source/Cargo.toml
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+beta-2021-08-01" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+beta-2021-08-01" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-67/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-67/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@sha256:34b6a614d2c27851fe6cbf88fbd1137609cefab8b10d0615aaeb6fd47975d74e" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2021-08-01" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 017ae4f968bebd3273c73c12c342d24c50fa64aad93358c778b2546380e6dda9
[INFO] running `Command { std: "docker" "start" "-a" "017ae4f968bebd3273c73c12c342d24c50fa64aad93358c778b2546380e6dda9", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "017ae4f968bebd3273c73c12c342d24c50fa64aad93358c778b2546380e6dda9", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "017ae4f968bebd3273c73c12c342d24c50fa64aad93358c778b2546380e6dda9", kill_on_drop: false }`
[INFO] [stdout] 017ae4f968bebd3273c73c12c342d24c50fa64aad93358c778b2546380e6dda9
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-67/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-67/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=warn" "-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@sha256:34b6a614d2c27851fe6cbf88fbd1137609cefab8b10d0615aaeb6fd47975d74e" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2021-08-01" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 462359080a45f286407884ac82abce35c6b2d6e4be9c376f30f073bc93fc303e
[INFO] running `Command { std: "docker" "start" "-a" "462359080a45f286407884ac82abce35c6b2d6e4be9c376f30f073bc93fc303e", kill_on_drop: false }`
[INFO] [stderr]    Compiling slice v0.0.4 (/opt/rustwide/workdir)
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 1.36s
[INFO] running `Command { std: "docker" "inspect" "462359080a45f286407884ac82abce35c6b2d6e4be9c376f30f073bc93fc303e", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "462359080a45f286407884ac82abce35c6b2d6e4be9c376f30f073bc93fc303e", kill_on_drop: false }`
[INFO] [stdout] 462359080a45f286407884ac82abce35c6b2d6e4be9c376f30f073bc93fc303e
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-67/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-67/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=warn" "-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@sha256:34b6a614d2c27851fe6cbf88fbd1137609cefab8b10d0615aaeb6fd47975d74e" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2021-08-01" "test" "--frozen" "--no-run" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 0bb2f91d9495abd226c9245b372aaf57f37c1d760b04849184e0d7bef6a4be3c
[INFO] running `Command { std: "docker" "start" "-a" "0bb2f91d9495abd226c9245b372aaf57f37c1d760b04849184e0d7bef6a4be3c", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]    Compiling slice v0.0.4 (/opt/rustwide/workdir)
[INFO] [stderr]     Finished test [unoptimized + debuginfo] target(s) in 1.24s
[INFO] running `Command { std: "docker" "inspect" "0bb2f91d9495abd226c9245b372aaf57f37c1d760b04849184e0d7bef6a4be3c", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "0bb2f91d9495abd226c9245b372aaf57f37c1d760b04849184e0d7bef6a4be3c", kill_on_drop: false }`
[INFO] [stdout] 0bb2f91d9495abd226c9245b372aaf57f37c1d760b04849184e0d7bef6a4be3c
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-67/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-67/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=warn" "-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@sha256:34b6a614d2c27851fe6cbf88fbd1137609cefab8b10d0615aaeb6fd47975d74e" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2021-08-01" "test" "--frozen", kill_on_drop: false }`
[INFO] [stdout] e49732b0e16fa16c76f32855848308245390ea4c5a5e0afea94be30847b1a479
[INFO] running `Command { std: "docker" "start" "-a" "e49732b0e16fa16c76f32855848308245390ea4c5a5e0afea94be30847b1a479", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]     Finished test [unoptimized + debuginfo] target(s) in 0.41s
[INFO] [stderr]      Running unittests (/opt/rustwide/target/debug/deps/slice-52f08a4b92791842)
[INFO] [stdout] 
[INFO] [stdout] running 0 tests
[INFO] [stdout] 
[INFO] [stdout] test result: ok. 0 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 0.00s
[INFO] [stdout] 
[INFO] [stderr]    Doc-tests slice
[INFO] [stdout] 
[INFO] [stdout] running 2 tests
[INFO] [stdout] test src/lib.rs - (line 10) ... FAILED
[INFO] [stdout] test src/lib.rs - IoSlice (line 56) ... FAILED
[INFO] [stdout] 
[INFO] [stdout] failures:
[INFO] [stdout] 
[INFO] [stdout] ---- src/lib.rs - (line 10) stdout ----
[INFO] [stdout] error[E0277]: the `?` operator can only be used in a function that returns `Result` or `Option` (or another type that implements `FromResidual`)
[INFO] [stdout]    --> src/lib.rs:14:48
[INFO] [stdout]     |
[INFO] [stdout] 3   |   fn main() { #[allow(non_snake_case)] fn _doctest_main_src_lib_rs_10_0() {
[INFO] [stdout]     |  ______________________________________-
[INFO] [stdout] 4   | | use { std::fs::File, slice::IoSlice };
[INFO] [stdout] 5   | |
[INFO] [stdout] 6   | |
[INFO] [stdout] 7   | | let source = File::open("/home/annie/data.png")?;
[INFO] [stdout]     | |                                                ^ cannot use the `?` operator in a function that returns `()`
[INFO] [stdout] ...   |
[INFO] [stdout] 27  | | //
[INFO] [stdout] 28  | | } _doctest_main_src_lib_rs_10_0() }
[INFO] [stdout]     | |_- this function should return `Result` or `Option` to accept `?`
[INFO] [stdout]     |
[INFO] [stdout]     = help: the trait `FromResidual<Result<Infallible, std::io::Error>>` is not implemented for `()`
[INFO] [stdout] note: required by `from_residual`
[INFO] [stdout] 
[INFO] [stdout] error: aborting due to previous error
[INFO] [stdout] 
[INFO] [stdout] For more information about this error, try `rustc --explain E0277`.
[INFO] [stdout] Couldn't compile the test.
[INFO] [stdout] ---- src/lib.rs - IoSlice (line 56) stdout ----
[INFO] [stdout] error[E0277]: the `?` operator can only be used in a function that returns `Result` or `Option` (or another type that implements `FromResidual`)
[INFO] [stdout]    --> src/lib.rs:60:48
[INFO] [stdout]     |
[INFO] [stdout] 3   |   fn main() { #[allow(non_snake_case)] fn _doctest_main_src_lib_rs_56_0() {
[INFO] [stdout]     |  ______________________________________-
[INFO] [stdout] 4   | | use { std::fs::File, slice::IoSlice };
[INFO] [stdout] 5   | |
[INFO] [stdout] 6   | |
[INFO] [stdout] 7   | | let source = File::open("/home/annie/data.png")?;
[INFO] [stdout]     | |                                                ^ cannot use the `?` operator in a function that returns `()`
[INFO] [stdout] ...   |
[INFO] [stdout] 27  | | //
[INFO] [stdout] 28  | | } _doctest_main_src_lib_rs_56_0() }
[INFO] [stdout]     | |_- this function should return `Result` or `Option` to accept `?`
[INFO] [stdout]     |
[INFO] [stdout]     = help: the trait `FromResidual<Result<Infallible, std::io::Error>>` is not implemented for `()`
[INFO] [stdout] note: required by `from_residual`
[INFO] [stdout] 
[INFO] [stdout] error: aborting due to previous error
[INFO] [stdout] 
[INFO] [stdout] For more information about this error, try `rustc --explain E0277`.
[INFO] [stdout] Couldn't compile the test.
[INFO] [stdout] 
[INFO] [stdout] failures:
[INFO] [stdout]     src/lib.rs - (line 10)
[INFO] [stdout]     src/lib.rs - IoSlice (line 56)
[INFO] [stdout] 
[INFO] [stdout] test result: FAILED. 0 passed; 2 failed; 0 ignored; 0 measured; 0 filtered out; finished in 0.19s
[INFO] [stdout] 
[INFO] [stderr] error: test failed, to rerun pass '--doc'
[INFO] running `Command { std: "docker" "inspect" "e49732b0e16fa16c76f32855848308245390ea4c5a5e0afea94be30847b1a479", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "e49732b0e16fa16c76f32855848308245390ea4c5a5e0afea94be30847b1a479", kill_on_drop: false }`
[INFO] [stdout] e49732b0e16fa16c76f32855848308245390ea4c5a5e0afea94be30847b1a479
