[INFO] cloning repository https://github.com/Nandem/Rust_learning
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/Nandem/Rust_learning" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FNandem%2FRust_learning", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FNandem%2FRust_learning'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] f6ba2518afb7cacb51835855bbd260bf98a628b1
[INFO] testing Nandem/Rust_learning against beta-2023-04-20 for beta-1.70-1
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FNandem%2FRust_learning" "/workspace/builds/worker-3-tc2/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-3-tc2/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/Nandem/Rust_learning on toolchain beta-2023-04-20
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+beta-2023-04-20" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/Nandem/Rust_learning
[INFO] finished tweaking git repo https://github.com/Nandem/Rust_learning
[INFO] tweaked toml for git repo https://github.com/Nandem/Rust_learning written to /workspace/builds/worker-3-tc2/source/Cargo.toml
[INFO] crate git repo https://github.com/Nandem/Rust_learning 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" "+beta-2023-04-20" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-3-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-3-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@sha256:5ff2268d62e97bff2cde7d5815dd6ed5b47097566f13b8d0ca110b04b60e07ed" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2023-04-20" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] e7578abf588330b88f2aba5d1e2bb882cb10125e4b59c44da6ab73f9e4eb0272
[INFO] running `Command { std: "docker" "start" "-a" "e7578abf588330b88f2aba5d1e2bb882cb10125e4b59c44da6ab73f9e4eb0272", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "e7578abf588330b88f2aba5d1e2bb882cb10125e4b59c44da6ab73f9e4eb0272", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "e7578abf588330b88f2aba5d1e2bb882cb10125e4b59c44da6ab73f9e4eb0272", kill_on_drop: false }`
[INFO] [stdout] e7578abf588330b88f2aba5d1e2bb882cb10125e4b59c44da6ab73f9e4eb0272
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-3-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-3-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=warn" "-e" "RUSTDOCFLAGS=--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@sha256:5ff2268d62e97bff2cde7d5815dd6ed5b47097566f13b8d0ca110b04b60e07ed" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2023-04-20" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] b0b16833fd45a60f4b3990d142dc21fd28d2151312638470b0231942671e3334
[INFO] running `Command { std: "docker" "start" "-a" "b0b16833fd45a60f4b3990d142dc21fd28d2151312638470b0231942671e3334", kill_on_drop: false }`
[INFO] [stderr]    Compiling learning v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] error[E0433]: failed to resolve: use of undeclared crate or module `io`
[INFO] [stdout]   --> src/errors/error1.rs:39:49
[INFO] [stdout]    |
[INFO] [stdout] 39 | fn read_username_from_file1() -> Result<String, io::Error> {
[INFO] [stdout]    |                                                 ^^ use of undeclared crate or module `io`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0433]: failed to resolve: use of undeclared crate or module `io`
[INFO] [stdout]   --> src/errors/error1.rs:55:49
[INFO] [stdout]    |
[INFO] [stdout] 55 | fn read_username_from_file2() -> Result<String, io::Error> {
[INFO] [stdout]    |                                                 ^^ use of undeclared crate or module `io`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0433]: failed to resolve: use of undeclared crate or module `io`
[INFO] [stdout]   --> src/errors/error1.rs:62:49
[INFO] [stdout]    |
[INFO] [stdout] 62 | fn read_username_from_file3() -> Result<String, io::Error> {
[INFO] [stdout]    |                                                 ^^ use of undeclared crate or module `io`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0599]: no method named `read_to_string` found for struct `File` in the current scope
[INFO] [stdout]   --> src/errors/error1.rs:49:13
[INFO] [stdout]    |
[INFO] [stdout] 49 |     match f.read_to_string(&mut s) {
[INFO] [stdout]    |             ^^^^^^^^^^^^^^ method not found in `File`
[INFO] [stdout]   --> /rustc/1b7dd2252b99671ce5d1cb9664c5f8636329436d/library/std/src/io/mod.rs:754:8
[INFO] [stdout]    |
[INFO] [stdout]    = note: the method is available for `File` here
[INFO] [stdout]    |
[INFO] [stdout]    = help: items from traits can only be used if the trait is in scope
[INFO] [stdout] help: the following trait is implemented but not in scope; perhaps add a `use` for it:
[INFO] [stdout]    |
[INFO] [stdout] 1  + use std::io::Read;
[INFO] [stdout]    |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0599]: no method named `read_to_string` found for struct `File` in the current scope
[INFO] [stdout]   --> src/errors/error1.rs:58:7
[INFO] [stdout]    |
[INFO] [stdout] 58 |     f.read_to_string(&mut s)?;
[INFO] [stdout]    |       ^^^^^^^^^^^^^^ method not found in `File`
[INFO] [stdout]   --> /rustc/1b7dd2252b99671ce5d1cb9664c5f8636329436d/library/std/src/io/mod.rs:754:8
[INFO] [stdout]    |
[INFO] [stdout]    = note: the method is available for `File` here
[INFO] [stdout]    |
[INFO] [stdout]    = help: items from traits can only be used if the trait is in scope
[INFO] [stdout] help: the following trait is implemented but not in scope; perhaps add a `use` for it:
[INFO] [stdout]    |
[INFO] [stdout] 1  + use std::io::Read;
[INFO] [stdout]    |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0599]: no method named `read_to_string` found for struct `File` in the current scope
[INFO] [stdout]   --> src/errors/error1.rs:65:30
[INFO] [stdout]    |
[INFO] [stdout] 65 |     File::open("hello.txt")?.read_to_string(&mut s)?;
[INFO] [stdout]    |                              ^^^^^^^^^^^^^^ method not found in `File`
[INFO] [stdout]   --> /rustc/1b7dd2252b99671ce5d1cb9664c5f8636329436d/library/std/src/io/mod.rs:754:8
[INFO] [stdout]    |
[INFO] [stdout]    = note: the method is available for `File` here
[INFO] [stdout]    |
[INFO] [stdout]    = help: items from traits can only be used if the trait is in scope
[INFO] [stdout] help: the following trait is implemented but not in scope; perhaps add a `use` for it:
[INFO] [stdout]    |
[INFO] [stdout] 1  + use std::io::Read;
[INFO] [stdout]    |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: aborting due to 6 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 `learning` (lib) due to 7 previous errors
[INFO] running `Command { std: "docker" "inspect" "b0b16833fd45a60f4b3990d142dc21fd28d2151312638470b0231942671e3334", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "b0b16833fd45a60f4b3990d142dc21fd28d2151312638470b0231942671e3334", kill_on_drop: false }`
[INFO] [stdout] b0b16833fd45a60f4b3990d142dc21fd28d2151312638470b0231942671e3334
