[INFO] cloning repository https://github.com/guillemcordoba/rust-lisbon-meetup-07-01-2020
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/guillemcordoba/rust-lisbon-meetup-07-01-2020" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fguillemcordoba%2Frust-lisbon-meetup-07-01-2020", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fguillemcordoba%2Frust-lisbon-meetup-07-01-2020'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 4e1017fa25906788e36834466bcf050c504c96ed
[INFO] checking guillemcordoba/rust-lisbon-meetup-07-01-2020 against master#af4a5a13a15fa0c60e06321077ef452f769b42fd for pr-122960-3
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fguillemcordoba%2Frust-lisbon-meetup-07-01-2020" "/workspace/builds/worker-2-tc1/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-2-tc1/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/guillemcordoba/rust-lisbon-meetup-07-01-2020 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/guillemcordoba/rust-lisbon-meetup-07-01-2020
[INFO] finished tweaking git repo https://github.com/guillemcordoba/rust-lisbon-meetup-07-01-2020
[INFO] tweaked toml for git repo https://github.com/guillemcordoba/rust-lisbon-meetup-07-01-2020 written to /workspace/builds/worker-2-tc1/source/Cargo.toml
[INFO] crate git repo https://github.com/guillemcordoba/rust-lisbon-meetup-07-01-2020 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] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-2-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-2-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] 0b0aceb83c16c37b83c80e3389aa9c5b375d32253d2e7f78b4ddfc5dfb6b7e7c
[INFO] running `Command { std: "docker" "start" "-a" "0b0aceb83c16c37b83c80e3389aa9c5b375d32253d2e7f78b4ddfc5dfb6b7e7c", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "0b0aceb83c16c37b83c80e3389aa9c5b375d32253d2e7f78b4ddfc5dfb6b7e7c", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "0b0aceb83c16c37b83c80e3389aa9c5b375d32253d2e7f78b4ddfc5dfb6b7e7c", kill_on_drop: false }`
[INFO] [stdout] 0b0aceb83c16c37b83c80e3389aa9c5b375d32253d2e7f78b4ddfc5dfb6b7e7c
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-2-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-2-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" "+af4a5a13a15fa0c60e06321077ef452f769b42fd" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 5f3b8a80f700d99b4bfdefc436098249f4dd04abe004f49eef82318e7ae24f52
[INFO] running `Command { std: "docker" "start" "-a" "5f3b8a80f700d99b4bfdefc436098249f4dd04abe004f49eef82318e7ae24f52", kill_on_drop: false }`
[INFO] [stderr]     Checking testing v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] error[E0596]: cannot borrow `*some_string` as mutable, as it is behind a `&` reference
[INFO] [stdout]  --> examples/ownership3.rs:8:5
[INFO] [stdout]   |
[INFO] [stdout] 8 |     some_string.push_str(", world"); // BAD! We have an immutable reference to some_string
[INFO] [stdout]   |     ^^^^^^^^^^^ `some_string` is a `&` reference, so the data it refers to cannot be borrowed as mutable
[INFO] [stdout]   |
[INFO] [stdout] help: consider changing this to be a mutable reference
[INFO] [stdout]   |
[INFO] [stdout] 7 | fn change(some_string: &mut String) {
[INFO] [stdout]   |                         +++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0502]: cannot borrow `s` as immutable because it is also borrowed as mutable
[INFO] [stdout]   --> examples/references.rs:20:14
[INFO] [stdout]    |
[INFO] [stdout] 19 |     let _x = &mut s;
[INFO] [stdout]    |              ------ mutable borrow occurs here
[INFO] [stdout] 20 |     let _y = &s;
[INFO] [stdout]    |              ^^ immutable borrow occurs here
[INFO] [stdout] 21 |     example(_x);
[INFO] [stdout]    |             -- mutable borrow later used here
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: aborting due to 1 previous error
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] For more information about this error, try `rustc --explain E0596`.
[INFO] [stdout] 
[INFO] [stdout] error: aborting due to 1 previous error
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] For more information about this error, try `rustc --explain E0502`.
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `s1`
[INFO] [stdout]  --> examples/ownership2.rs:2:9
[INFO] [stdout]   |
[INFO] [stdout] 2 |     let s1 = gives_ownership(); // gives_ownership moves its return
[INFO] [stdout]   |         ^^ help: if this is intentional, prefix it with an underscore: `_s1`
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `s3`
[INFO] [stdout]  --> examples/ownership2.rs:7:9
[INFO] [stdout]   |
[INFO] [stdout] 7 |     let s3 = takes_and_gives_back(s2); // s2 is moved into
[INFO] [stdout]   |         ^^ help: if this is intentional, prefix it with an underscore: `_s3`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `testing` (example "ownership3") due to 2 previous errors
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[INFO] [stderr] error: could not compile `testing` (example "references") due to 2 previous errors
[INFO] [stdout] error[E0601]: `main` function not found in crate `optionandresult`
[INFO] [stdout]   --> examples/optionandresult.rs:21:2
[INFO] [stdout]    |
[INFO] [stdout] 21 | }
[INFO] [stdout]    |  ^ consider adding a `main` function to `examples/optionandresult.rs`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 2 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: aborting due to 1 previous error
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] For more information about this error, try `rustc --explain E0601`.
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `testing` (example "optionandresult") due to 2 previous errors
[INFO] running `Command { std: "docker" "inspect" "5f3b8a80f700d99b4bfdefc436098249f4dd04abe004f49eef82318e7ae24f52", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "5f3b8a80f700d99b4bfdefc436098249f4dd04abe004f49eef82318e7ae24f52", kill_on_drop: false }`
[INFO] [stdout] 5f3b8a80f700d99b4bfdefc436098249f4dd04abe004f49eef82318e7ae24f52