[INFO] cloning repository https://github.com/masa-matt/rust-tutrial
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/masa-matt/rust-tutrial" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fmasa-matt%2Frust-tutrial", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fmasa-matt%2Frust-tutrial'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] f572f11c89d483c1e75e90de7350b967c35b7b45
[INFO] checking masa-matt/rust-tutrial against master#af4a5a13a15fa0c60e06321077ef452f769b42fd for pr-122960-4
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fmasa-matt%2Frust-tutrial" "/workspace/builds/worker-0-tc1/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-0-tc1/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/masa-matt/rust-tutrial on toolchain af4a5a13a15fa0c60e06321077ef452f769b42fd
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+af4a5a13a15fa0c60e06321077ef452f769b42fd" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/masa-matt/rust-tutrial
[INFO] finished tweaking git repo https://github.com/masa-matt/rust-tutrial
[INFO] tweaked toml for git repo https://github.com/masa-matt/rust-tutrial written to /workspace/builds/worker-0-tc1/source/Cargo.toml
[INFO] crate git repo https://github.com/masa-matt/rust-tutrial 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" "+af4a5a13a15fa0c60e06321077ef452f769b42fd" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr] warning: virtual workspace defaulting to `resolver = "1"` despite one or more workspace members being on edition 2021 which implies `resolver = "2"`
[INFO] [stderr] note: to keep the current resolver, specify `workspace.resolver = "1"` in the workspace root's manifest
[INFO] [stderr] note: to use the edition 2021 resolver, specify `workspace.resolver = "2"` in the workspace root's manifest
[INFO] [stderr] note: for more details see https://doc.rust-lang.org/cargo/reference/resolver.html#resolver-versions
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]     Updating crates.io index
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]  Downloading crates ...
[INFO] [stderr]   Downloaded rug v1.19.0
[INFO] [stderr]   Downloaded gmp-mpfr-sys v1.5.0
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-0-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-0-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" "+af4a5a13a15fa0c60e06321077ef452f769b42fd" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 7a687dde0d40a3e701800acd6a6a6663494268f5c9da5d92984aa501c61a4dca
[INFO] running `Command { std: "docker" "start" "-a" "7a687dde0d40a3e701800acd6a6a6663494268f5c9da5d92984aa501c61a4dca", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "7a687dde0d40a3e701800acd6a6a6663494268f5c9da5d92984aa501c61a4dca", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "7a687dde0d40a3e701800acd6a6a6663494268f5c9da5d92984aa501c61a4dca", kill_on_drop: false }`
[INFO] [stdout] 7a687dde0d40a3e701800acd6a6a6663494268f5c9da5d92984aa501c61a4dca
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-0-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-0-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=allow" "-e" "RUSTDOCFLAGS=--cap-lints=allow" "-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" "+af4a5a13a15fa0c60e06321077ef452f769b42fd" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] a826ca85b091e558e6eee731dd3f3b3cdb8350cbdad841ed678cb54b705e2233
[INFO] running `Command { std: "docker" "start" "-a" "a826ca85b091e558e6eee731dd3f3b3cdb8350cbdad841ed678cb54b705e2233", kill_on_drop: false }`
[INFO] [stderr] warning: virtual workspace defaulting to `resolver = "1"` despite one or more workspace members being on edition 2021 which implies `resolver = "2"`
[INFO] [stderr] note: to keep the current resolver, specify `workspace.resolver = "1"` in the workspace root's manifest
[INFO] [stderr] note: to use the edition 2021 resolver, specify `workspace.resolver = "2"` in the workspace root's manifest
[INFO] [stderr] note: for more details see https://doc.rust-lang.org/cargo/reference/resolver.html#resolver-versions
[INFO] [stderr]    Compiling libc v0.2.139
[INFO] [stderr]    Compiling gmp-mpfr-sys v1.5.0
[INFO] [stderr]    Compiling rug v1.19.0
[INFO] [stderr]     Checking ch11-03-test-organization v0.1.0 (/opt/rustwide/workdir/ch11/ch11-03-test-organization)
[INFO] [stderr]     Checking ch07-04-bringing-paths-into-scope-with-the-use-keyword v0.1.0 (/opt/rustwide/workdir/ch07/ch07-04-bringing-paths-into-scope-with-the-use-keyword)
[INFO] [stderr]     Checking ch05-01-defining-structs v0.1.0 (/opt/rustwide/workdir/ch05/ch05-01-defining-structs)
[INFO] [stderr]     Checking variables v0.1.0 (/opt/rustwide/workdir/ch03/ch03-01-variables-and-mutability)
[INFO] [stderr]     Checking ch04-02-references-and-borrowing v0.1.0 (/opt/rustwide/workdir/ch04/ch04-02-references-and-borrowing)
[INFO] [stderr]     Checking ch10-02-traits v0.1.0 (/opt/rustwide/workdir/ch10/ch10-02-traits)
[INFO] [stderr]     Checking ch09-02-recoverable-errors-with-result v0.1.0 (/opt/rustwide/workdir/ch09/ch09-02-recoverable-errors-with-result)
[INFO] [stderr]     Checking ch03-04-comments v0.1.0 (/opt/rustwide/workdir/ch03/ch03-04-comments)
[INFO] [stderr]     Checking ch09-03-to-panic-or-not-to-panic v0.1.0 (/opt/rustwide/workdir/ch09/ch09-03-to-panic-or-not-to-panic)
[INFO] [stderr]     Checking ch10-03-lifetime-syntax v0.1.0 (/opt/rustwide/workdir/ch10/ch10-03-lifetime-syntax)
[INFO] [stderr]     Checking ch10-00-generics v0.1.0 (/opt/rustwide/workdir/ch10/ch10-00-generics)
[INFO] [stderr]     Checking ch05-02-example-structs v0.1.0 (/opt/rustwide/workdir/ch05/ch05-02-example-structs)
[INFO] [stdout] error[E0252]: the name `io` is defined multiple times
[INFO] [stdout]   --> ch07/ch07-04-bringing-paths-into-scope-with-the-use-keyword/src/lib.rs:68:26
[INFO] [stdout]    |
[INFO] [stdout] 43 | use std::io;
[INFO] [stdout]    |     ------- previous import of the module `io` here
[INFO] [stdout] ...
[INFO] [stdout] 68 | use std::{cmp::Ordering, io};
[INFO] [stdout]    |                          ^^ `io` reimported here
[INFO] [stdout]    |
[INFO] [stdout]    = note: `io` must be defined only once in the type namespace of this module
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0252]: the name `io` is defined multiple times
[INFO] [stdout]   --> ch07/ch07-04-bringing-paths-into-scope-with-the-use-keyword/src/lib.rs:73:15
[INFO] [stdout]    |
[INFO] [stdout] 43 | use std::io;
[INFO] [stdout]    |     ------- previous import of the module `io` here
[INFO] [stdout] ...
[INFO] [stdout] 73 | use std::io::{self, Write};
[INFO] [stdout]    |               ^^^^--
[INFO] [stdout]    |               |
[INFO] [stdout]    |               `io` reimported here
[INFO] [stdout]    |               help: remove unnecessary import
[INFO] [stdout]    |
[INFO] [stdout]    = note: `io` must be defined only once in the type namespace of this module
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Checking ch06-02-match v0.1.0 (/opt/rustwide/workdir/ch06/ch06-02-match)
[INFO] [stdout] error: aborting due to 2 previous errors
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] For more information about this error, try `rustc --explain E0252`.
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `ch07-04-bringing-paths-into-scope-with-the-use-keyword` (lib test) due to 3 previous errors
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[INFO] [stdout] error[E0432]: unresolved import `rand`
[INFO] [stdout]  --> ch09/ch09-03-to-panic-or-not-to-panic/src/main.rs:1:5
[INFO] [stdout]   |
[INFO] [stdout] 1 | use rand::Rng;
[INFO] [stdout]   |     ^^^^ use of undeclared crate or module `rand`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0106]: missing lifetime specifier
[INFO] [stdout]   --> ch04/ch04-02-references-and-borrowing/src/main.rs:68:16
[INFO] [stdout]    |
[INFO] [stdout] 68 | fn dangle() -> &String {
[INFO] [stdout]    |                ^ expected named lifetime parameter
[INFO] [stdout]    |
[INFO] [stdout]    = help: this function's return type contains a borrowed value, but there is no value for it to be borrowed from
[INFO] [stdout] help: consider using the `'static` lifetime, but this is uncommon unless you're returning a borrowed value from a `const` or a `static`
[INFO] [stdout]    |
[INFO] [stdout] 68 | fn dangle() -> &'static String {
[INFO] [stdout]    |                 +++++++
[INFO] [stdout] help: instead, you are more likely to want to return an owned value
[INFO] [stdout]    |
[INFO] [stdout] 68 - fn dangle() -> &String {
[INFO] [stdout] 68 + fn dangle() -> String {
[INFO] [stdout]    |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0515]: cannot return reference to local variable `s`
[INFO] [stdout]   --> ch04/ch04-02-references-and-borrowing/src/main.rs:73:5
[INFO] [stdout]    |
[INFO] [stdout] 73 |     &s // we return a reference to the String, s
[INFO] [stdout]    |     ^^ returns a reference to data owned by the current function
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0433]: failed to resolve: use of undeclared crate or module `rand`
[INFO] [stdout]   --> ch09/ch09-03-to-panic-or-not-to-panic/src/main.rs:38:25
[INFO] [stdout]    |
[INFO] [stdout] 38 |     let secret_number = rand::thread_rng().gen_range(1..=100);
[INFO] [stdout]    |                         ^^^^ use of undeclared crate or module `rand`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: aborting due to 2 previous errors
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] Some errors have detailed explanations: E0106, E0515.
[INFO] [stdout] 
[INFO] [stdout] For more information about an error, try `rustc --explain E0106`.
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `ch04-02-references-and-borrowing` (bin "ch04-02-references-and-borrowing" test) due to 3 previous errors
[INFO] [stdout] error: aborting due to 2 previous errors
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] Some errors have detailed explanations: E0432, E0433.
[INFO] [stdout] 
[INFO] [stdout] For more information about an error, try `rustc --explain E0432`.
[INFO] [stdout] 
[INFO] [stdout] error[E0106]: missing lifetime specifier
[INFO] [stdout]   --> ch04/ch04-02-references-and-borrowing/src/main.rs:68:16
[INFO] [stdout]    |
[INFO] [stdout] 68 | fn dangle() -> &String {
[INFO] [stdout]    |                ^ expected named lifetime parameter
[INFO] [stdout]    |
[INFO] [stdout]    = help: this function's return type contains a borrowed value, but there is no value for it to be borrowed from
[INFO] [stdout] help: consider using the `'static` lifetime, but this is uncommon unless you're returning a borrowed value from a `const` or a `static`
[INFO] [stdout]    |
[INFO] [stdout] 68 | fn dangle() -> &'static String {
[INFO] [stdout]    |                 +++++++
[INFO] [stdout] help: instead, you are more likely to want to return an owned value
[INFO] [stdout]    |
[INFO] [stdout] 68 - fn dangle() -> &String {
[INFO] [stdout] 68 + fn dangle() -> String {
[INFO] [stdout]    |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `ch09-03-to-panic-or-not-to-panic` (bin "ch09-03-to-panic-or-not-to-panic" test) due to 3 previous errors
[INFO] [stdout] error[E0515]: cannot return reference to local variable `s`
[INFO] [stdout]   --> ch04/ch04-02-references-and-borrowing/src/main.rs:73:5
[INFO] [stdout]    |
[INFO] [stdout] 73 |     &s // we return a reference to the String, s
[INFO] [stdout]    |     ^^ returns a reference to data owned by the current function
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: aborting due to 2 previous errors
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] Some errors have detailed explanations: E0106, E0515.
[INFO] [stdout] 
[INFO] [stdout] For more information about an error, try `rustc --explain E0106`.
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `ch04-02-references-and-borrowing` (bin "ch04-02-references-and-borrowing") due to 3 previous errors
[INFO] running `Command { std: "docker" "inspect" "a826ca85b091e558e6eee731dd3f3b3cdb8350cbdad841ed678cb54b705e2233", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "a826ca85b091e558e6eee731dd3f3b3cdb8350cbdad841ed678cb54b705e2233", kill_on_drop: false }`
[INFO] [stdout] a826ca85b091e558e6eee731dd3f3b3cdb8350cbdad841ed678cb54b705e2233