[INFO] fetching crate rcut-lib 0.0.48...
[INFO] testing rcut-lib-0.0.48 against 1.49.0 for beta-1.50-1
[INFO] extracting crate rcut-lib 0.0.48 into /workspace/builds/worker-1/source
[INFO] validating manifest of crates.io crate rcut-lib 0.0.48 on toolchain 1.49.0
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.49.0" "read-manifest" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] started tweaking crates.io crate rcut-lib 0.0.48
[INFO] finished tweaking crates.io crate rcut-lib 0.0.48
[INFO] tweaked toml for crates.io crate rcut-lib 0.0.48 written to /workspace/builds/worker-1/source/Cargo.toml
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.49.0" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update", kill_on_drop: false }`
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.49.0" "fetch" "--locked" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-1/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" "rustops/crates-build-env@sha256:c8ac004eab7d63a0ad09a2dde3d3353ba464f767bee4de425dc8f74c46a1905e" "/opt/rustwide/cargo-home/bin/cargo" "+1.49.0" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 4c5e37dec098805e2b70f001c8bfe29492ce2e1a07134dc0543b01b5f7811cfd
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] running `Command { std: "docker" "start" "-a" "4c5e37dec098805e2b70f001c8bfe29492ce2e1a07134dc0543b01b5f7811cfd", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "4c5e37dec098805e2b70f001c8bfe29492ce2e1a07134dc0543b01b5f7811cfd", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "4c5e37dec098805e2b70f001c8bfe29492ce2e1a07134dc0543b01b5f7811cfd", kill_on_drop: false }`
[INFO] [stdout] 4c5e37dec098805e2b70f001c8bfe29492ce2e1a07134dc0543b01b5f7811cfd
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-1/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" "rustops/crates-build-env@sha256:c8ac004eab7d63a0ad09a2dde3d3353ba464f767bee4de425dc8f74c46a1905e" "/opt/rustwide/cargo-home/bin/cargo" "+1.49.0" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] fb5b03b573bc5bdfb7eaefd96193af6124834238fb8099de2dbd3b5869970bbd
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] running `Command { std: "docker" "start" "-a" "fb5b03b573bc5bdfb7eaefd96193af6124834238fb8099de2dbd3b5869970bbd", kill_on_drop: false }`
[INFO] [stderr]    Compiling rtools-traits v0.0.48
[INFO] [stderr]    Compiling rcut-lib v0.0.48 (/opt/rustwide/workdir)
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 1.33s
[INFO] running `Command { std: "docker" "inspect" "fb5b03b573bc5bdfb7eaefd96193af6124834238fb8099de2dbd3b5869970bbd", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "fb5b03b573bc5bdfb7eaefd96193af6124834238fb8099de2dbd3b5869970bbd", kill_on_drop: false }`
[INFO] [stdout] fb5b03b573bc5bdfb7eaefd96193af6124834238fb8099de2dbd3b5869970bbd
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-1/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" "rustops/crates-build-env@sha256:c8ac004eab7d63a0ad09a2dde3d3353ba464f767bee4de425dc8f74c46a1905e" "/opt/rustwide/cargo-home/bin/cargo" "+1.49.0" "test" "--frozen" "--no-run" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] e9ffe4608241161be73283b2331bb8f35288f1dcd4cabd074c5b76065073603d
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] running `Command { std: "docker" "start" "-a" "e9ffe4608241161be73283b2331bb8f35288f1dcd4cabd074c5b76065073603d", kill_on_drop: false }`
[INFO] [stderr]    Compiling rcut-lib v0.0.48 (/opt/rustwide/workdir)
[INFO] [stdout] error[E0433]: failed to resolve: use of undeclared type `BufReader`
[INFO] [stdout]    --> src/lib.rs:446:21
[INFO] [stdout]     |
[INFO] [stdout] 446 |         let input = BufReader::new(std::io::Cursor::new(_STR_BIRDS));
[INFO] [stdout]     |                     ^^^^^^^^^ not found in this scope
[INFO] [stdout]     |
[INFO] [stdout] help: consider importing one of these items
[INFO] [stdout]     |
[INFO] [stdout] 275 |     use crate::tests::rtools_traits::BufReader;
[INFO] [stdout]     |
[INFO] [stdout] 275 |     use std::io::BufReader;
[INFO] [stdout]     |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0433]: failed to resolve: use of undeclared type `BufWriter`
[INFO] [stdout]    --> src/lib.rs:455:18
[INFO] [stdout]     |
[INFO] [stdout] 455 |             &mut BufWriter::new(&mut out_cursor),
[INFO] [stdout]     |                  ^^^^^^^^^ not found in this scope
[INFO] [stdout]     |
[INFO] [stdout] help: consider importing one of these items
[INFO] [stdout]     |
[INFO] [stdout] 275 |     use crate::tests::rtools_traits::BufWriter;
[INFO] [stdout]     |
[INFO] [stdout] 275 |     use std::io::BufWriter;
[INFO] [stdout]     |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0599]: no method named `seek` found for struct `std::io::Cursor<Vec<u8>>` in the current scope
[INFO] [stdout]     --> src/lib.rs:461:20
[INFO] [stdout]      |
[INFO] [stdout] 461  |         out_cursor.seek(std::io::SeekFrom::Start(0)).unwrap();
[INFO] [stdout]      |                    ^^^^ method not found in `std::io::Cursor<Vec<u8>>`
[INFO] [stdout]      |
[INFO] [stdout]      = help: items from traits can only be used if the trait is in scope
[INFO] [stdout]      = note: the following trait is implemented but not in scope; perhaps add a `use` for it:
[INFO] [stdout]              `use std::io::Seek;`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0599]: no method named `read_to_end` found for struct `std::io::Cursor<Vec<u8>>` in the current scope
[INFO] [stdout]    --> src/lib.rs:464:20
[INFO] [stdout]     |
[INFO] [stdout] 464 |         out_cursor.read_to_end(&mut out).unwrap();
[INFO] [stdout]     |                    ^^^^^^^^^^^ method not found in `std::io::Cursor<Vec<u8>>`
[INFO] [stdout]     |
[INFO] [stdout]     = help: items from traits can only be used if the trait is in scope
[INFO] [stdout]     = note: the following trait is implemented but not in scope; perhaps add a `use` for it:
[INFO] [stdout]             `use std::io::Read;`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: aborting due to 4 previous errors
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] Some errors have detailed explanations: E0433, E0599.
[INFO] [stdout] 
[INFO] [stdout] For more information about an error, try `rustc --explain E0433`.
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `rcut-lib`
[INFO] [stderr] 
[INFO] [stderr] To learn more, run the command again with --verbose.
[INFO] running `Command { std: "docker" "inspect" "e9ffe4608241161be73283b2331bb8f35288f1dcd4cabd074c5b76065073603d", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "e9ffe4608241161be73283b2331bb8f35288f1dcd4cabd074c5b76065073603d", kill_on_drop: false }`
[INFO] [stdout] e9ffe4608241161be73283b2331bb8f35288f1dcd4cabd074c5b76065073603d