[INFO] updating cached repository https://github.com/guillemcordoba/rust-lisbon-meetup-07-01-2020
[INFO] running `"git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "-c" "remote.origin.fetch=refs/heads/*:refs/heads/*" "fetch" "origin" "--force" "--prune"`
[INFO] running `"git" "rev-parse" "HEAD"`
[INFO] [stdout] 4e1017fa25906788e36834466bcf050c504c96ed
[INFO] checking guillemcordoba/rust-lisbon-meetup-07-01-2020 against try#e4dba30b9b475d8750370c4dfb49b6541990904d for pr-71393
[INFO] running `"git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fguillemcordoba%2Frust-lisbon-meetup-07-01-2020" "/workspace/builds/worker-0/source"`
[INFO] [stderr] Cloning into '/workspace/builds/worker-0/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/guillemcordoba/rust-lisbon-meetup-07-01-2020 on toolchain e4dba30b9b475d8750370c4dfb49b6541990904d
[INFO] running `"/workspace/cargo-home/bin/cargo" "+e4dba30b9b475d8750370c4dfb49b6541990904d" "read-manifest" "--manifest-path" "Cargo.toml"`
[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-0/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 `"/workspace/cargo-home/bin/cargo" "+e4dba30b9b475d8750370c4dfb49b6541990904d" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] running `"docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-0/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-0/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" "MAP_USER_ID=0" "-e" "CARGO_TARGET_DIR=/opt/rustwide/target" "-e" "CARGO_INCREMENTAL=0" "-e" "RUST_BACKTRACE=full" "-e" "RUSTFLAGS=--cap-lints=forbid" "-e" "CARGO_HOME=/opt/rustwide/cargo-home" "-e" "RUSTUP_HOME=/opt/rustwide/rustup-home" "-w" "/opt/rustwide/workdir" "-m" "1610612736" "--network" "none" "rustops/crates-build-env" "/opt/rustwide/cargo-home/bin/cargo" "+e4dba30b9b475d8750370c4dfb49b6541990904d" "check" "--frozen" "--all" "--all-targets"`
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] [stdout] 269c73bdb61458c1c78093236ca6842ac177fec46ecd9919800685005f14cdbb
[INFO] running `"docker" "start" "-a" "269c73bdb61458c1c78093236ca6842ac177fec46ecd9919800685005f14cdbb"`
[INFO] [stderr]     Checking testing v0.1.0 (/opt/rustwide/workdir)
[INFO] [stderr] warning: unused variable: `s1`
[INFO] [stderr]  --> examples/ownership2.rs:2:9
[INFO] [stderr]   |
[INFO] [stderr] 2 |     let s1 = gives_ownership(); // gives_ownership moves its return
[INFO] [stderr]   |         ^^ help: if this is intentional, prefix it with an underscore: `_s1`
[INFO] [stderr]   |
[INFO] [stderr]   = note: `#[warn(unused_variables)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `s3`
[INFO] [stderr]  --> examples/ownership2.rs:7:9
[INFO] [stderr]   |
[INFO] [stderr] 7 |     let s3 = takes_and_gives_back(s2); // s2 is moved into
[INFO] [stderr]   |         ^^ help: if this is intentional, prefix it with an underscore: `_s3`
[INFO] [stderr] 
[INFO] [stderr] error[E0603]: module `hosting` is private
[INFO] [stderr]   --> examples/modules.rs:11:28
[INFO] [stderr]    |
[INFO] [stderr] 11 |     crate::front_of_house::hosting::add_to_waitlist();
[INFO] [stderr]    |                            ^^^^^^^ private module
[INFO] [stderr]    |
[INFO] [stderr] note: the module `hosting` is defined here
[INFO] [stderr]   --> examples/modules.rs:4:5
[INFO] [stderr]    |
[INFO] [stderr] 4  |     mod hosting {
[INFO] [stderr]    |     ^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] error[E0603]: module `hosting` is private
[INFO] [stderr]   --> examples/modules.rs:14:21
[INFO] [stderr]    |
[INFO] [stderr] 14 |     front_of_house::hosting::add_to_waitlist();
[INFO] [stderr]    |                     ^^^^^^^ private module
[INFO] [stderr]    |
[INFO] [stderr] note: the module `hosting` is defined here
[INFO] [stderr]   --> examples/modules.rs:4:5
[INFO] [stderr]    |
[INFO] [stderr] 4  |     mod hosting {
[INFO] [stderr]    |     ^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] error: aborting due to 2 previous errors
[INFO] [stderr] 
[INFO] [stderr] For more information about this error, try `rustc --explain E0603`.
[INFO] [stderr] error: could not compile `testing`.
[INFO] [stderr] 
[INFO] [stderr] To learn more, run the command again with --verbose.
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[INFO] [stderr] warning: 2 warnings emitted
[INFO] [stderr] 
[INFO] [stderr] warning: variant is never constructed: `Iceray`
[INFO] [stderr]   --> examples/basics.rs:16:5
[INFO] [stderr]    |
[INFO] [stderr] 16 |     Iceray,
[INFO] [stderr]    |     ^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(dead_code)]` on by default
[INFO] [stderr] 
[INFO] [stderr] error[E0601]: `main` function not found in crate `optionandresult`
[INFO] [stderr]   --> examples/optionandresult.rs:2:1
[INFO] [stderr]    |
[INFO] [stderr] 2  | / fn checked_division(dividend: i32, divisor: i32) -> Option<i32> {
[INFO] [stderr] 3  | |     if divisor == 0 {
[INFO] [stderr] 4  | |         // Failure is represented as the `None` variant
[INFO] [stderr] 5  | |         None
[INFO] [stderr] ...  |
[INFO] [stderr] 20 | |     }
[INFO] [stderr] 21 | | }
[INFO] [stderr]    | |_^ consider adding a `main` function to `examples/optionandresult.rs`
[INFO] [stderr] 
[INFO] [stderr] warning: field is never read: `name`
[INFO] [stderr]   --> examples/basics.rs:20:5
[INFO] [stderr]    |
[INFO] [stderr] 20 |     name: String,
[INFO] [stderr]    |     ^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] error[E0502]: cannot borrow `s` as immutable because it is also borrowed as mutable
[INFO] [stderr]   --> examples/references.rs:20:14
[INFO] [stderr]    |
[INFO] [stderr] 19 |     let _x = &mut s;
[INFO] [stderr]    |              ------ mutable borrow occurs here
[INFO] [stderr] 20 |     let _y = &s;
[INFO] [stderr]    |              ^^ immutable borrow occurs here
[INFO] [stderr] 21 |     example(_x);
[INFO] [stderr]    |             -- mutable borrow later used here
[INFO] [stderr] 
[INFO] [stderr] error: aborting due to previous error
[INFO] [stderr] 
[INFO] [stderr] For more information about this error, try `rustc --explain E0502`.
[INFO] [stderr] error: aborting due to previous error
[INFO] [stderr] 
[INFO] [stderr] For more information about this error, try `rustc --explain E0601`.
[INFO] [stderr] error: could not compile `testing`.
[INFO] [stderr] 
[INFO] [stderr] To learn more, run the command again with --verbose.
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[INFO] [stderr] error: could not compile `testing`.
[INFO] [stderr] 
[INFO] [stderr] To learn more, run the command again with --verbose.
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[INFO] [stderr] warning: unused variable: `r1`
[INFO] [stderr]  --> examples/ownership4.rs:6:9
[INFO] [stderr]   |
[INFO] [stderr] 6 |     let r1 = &mut s;
[INFO] [stderr]   |         ^^ help: if this is intentional, prefix it with an underscore: `_r1`
[INFO] [stderr]   |
[INFO] [stderr]   = note: `#[warn(unused_variables)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `r2`
[INFO] [stderr]  --> examples/ownership4.rs:7:9
[INFO] [stderr]   |
[INFO] [stderr] 7 |     let r2 = &mut s; // BAD! Only one mutable reference possible at any given time
[INFO] [stderr]   |         ^^ help: if this is intentional, prefix it with an underscore: `_r2`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `r1`
[INFO] [stderr]   --> examples/ownership4.rs:13:9
[INFO] [stderr]    |
[INFO] [stderr] 13 |     let r1 = &s; // no problem
[INFO] [stderr]    |         ^^ help: if this is intentional, prefix it with an underscore: `_r1`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `r2`
[INFO] [stderr]   --> examples/ownership4.rs:14:9
[INFO] [stderr]    |
[INFO] [stderr] 14 |     let r2 = &s; // no problem
[INFO] [stderr]    |         ^^ help: if this is intentional, prefix it with an underscore: `_r2`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `r3`
[INFO] [stderr]   --> examples/ownership4.rs:15:9
[INFO] [stderr]    |
[INFO] [stderr] 15 |     let r3 = &mut s; // BAD! Only either multiple immutable references or one mutable reference possible at any given time
[INFO] [stderr]    |         ^^ help: if this is intentional, prefix it with an underscore: `_r3`
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `example1`
[INFO] [stderr]  --> examples/ownership4.rs:3:4
[INFO] [stderr]   |
[INFO] [stderr] 3 | fn example1() {
[INFO] [stderr]   |    ^^^^^^^^
[INFO] [stderr]   |
[INFO] [stderr]   = note: `#[warn(dead_code)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `example2`
[INFO] [stderr]   --> examples/ownership4.rs:10:4
[INFO] [stderr]    |
[INFO] [stderr] 10 | fn example2() {
[INFO] [stderr]    |    ^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: 2 warnings emitted
[INFO] [stderr] 
[INFO] [stderr] error[E0596]: cannot borrow `*some_string` as mutable, as it is behind a `&` reference
[INFO] [stderr]  --> examples/ownership3.rs:8:5
[INFO] [stderr]   |
[INFO] [stderr] 7 | fn change(some_string: &String) {
[INFO] [stderr]   |                        ------- help: consider changing this to be a mutable reference: `&mut std::string::String`
[INFO] [stderr] 8 |     some_string.push_str(", world"); // BAD! We have an immutable reference to some_string
[INFO] [stderr]   |     ^^^^^^^^^^^ `some_string` is a `&` reference, so the data it refers to cannot be borrowed as mutable
[INFO] [stderr] 
[INFO] [stderr] error: aborting due to previous error
[INFO] [stderr] 
[INFO] [stderr] For more information about this error, try `rustc --explain E0596`.
[INFO] [stderr] warning: 7 warnings emitted
[INFO] [stderr] 
[INFO] [stderr] error: could not compile `testing`.
[INFO] [stderr] 
[INFO] [stderr] To learn more, run the command again with --verbose.
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[INFO] [stderr] warning: function is never used: `match_literals`
[INFO] [stderr]  --> examples/matching.rs:3:4
[INFO] [stderr]   |
[INFO] [stderr] 3 | fn match_literals() {
[INFO] [stderr]   |    ^^^^^^^^^^^^^^
[INFO] [stderr]   |
[INFO] [stderr]   = note: `#[warn(dead_code)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `match_variable`
[INFO] [stderr]   --> examples/matching.rs:13:4
[INFO] [stderr]    |
[INFO] [stderr] 13 | fn match_variable() {
[INFO] [stderr]    |    ^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: struct is never constructed: `Point`
[INFO] [stderr]   --> examples/matching.rs:26:8
[INFO] [stderr]    |
[INFO] [stderr] 26 | struct Point {
[INFO] [stderr]    |        ^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `match_struct`
[INFO] [stderr]   --> examples/matching.rs:30:4
[INFO] [stderr]    |
[INFO] [stderr] 30 | fn match_struct() {
[INFO] [stderr]    |    ^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: enum is never used: `Message`
[INFO] [stderr]   --> examples/matching.rs:40:6
[INFO] [stderr]    |
[INFO] [stderr] 40 | enum Message {
[INFO] [stderr]    |      ^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `match_enum`
[INFO] [stderr]   --> examples/matching.rs:47:4
[INFO] [stderr]    |
[INFO] [stderr] 47 | fn match_enum() {
[INFO] [stderr]    |    ^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: 6 warnings emitted
[INFO] [stderr] 
[INFO] [stderr] error: build failed
[INFO] running `"docker" "inspect" "269c73bdb61458c1c78093236ca6842ac177fec46ecd9919800685005f14cdbb"`
[INFO] running `"docker" "rm" "-f" "269c73bdb61458c1c78093236ca6842ac177fec46ecd9919800685005f14cdbb"`
[INFO] [stdout] 269c73bdb61458c1c78093236ca6842ac177fec46ecd9919800685005f14cdbb