[INFO] updating cached repository https://github.com/kdnk/rust_introduction
[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] 4a644f9533c899940a70df93d978e23509f90120
[INFO] checking kdnk/rust_introduction against master#bd0bacc694d7d8175804bb6f690cb846bfa4a9ee for pr-71665
[INFO] running `"git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fkdnk%2Frust_introduction" "/workspace/builds/worker-7/source"`
[INFO] [stderr] Cloning into '/workspace/builds/worker-7/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/kdnk/rust_introduction on toolchain bd0bacc694d7d8175804bb6f690cb846bfa4a9ee
[INFO] running `"/workspace/cargo-home/bin/cargo" "+bd0bacc694d7d8175804bb6f690cb846bfa4a9ee" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] started tweaking git repo https://github.com/kdnk/rust_introduction
[INFO] finished tweaking git repo https://github.com/kdnk/rust_introduction
[INFO] tweaked toml for git repo https://github.com/kdnk/rust_introduction written to /workspace/builds/worker-7/source/Cargo.toml
[INFO] crate git repo https://github.com/kdnk/rust_introduction already has a lockfile, it will not be regenerated
[INFO] running `"/workspace/cargo-home/bin/cargo" "+bd0bacc694d7d8175804bb6f690cb846bfa4a9ee" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] running `"docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-7/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-7/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" "+bd0bacc694d7d8175804bb6f690cb846bfa4a9ee" "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] 85d4d5cef0aa32cab922d5cb76cdfe32c5a05e84721a24606911f9a97fbf2a5d
[INFO] running `"docker" "start" "-a" "85d4d5cef0aa32cab922d5cb76cdfe32c5a05e84721a24606911f9a97fbf2a5d"`
[INFO] [stderr] sudo: setrlimit(RLIMIT_CORE): Operation not permitted
[INFO] [stderr]     Checking rust_introduction v0.1.0 (/opt/rustwide/workdir)
[INFO] [stderr] error: couldn't read src/07_ownership/04_borrow.rs: No such file or directory (os error 2)
[INFO] [stderr] 
[INFO] [stderr] error: couldn't read src/07_ownership/01_value_ownership.rs: No such file or directory (os error 2)
[INFO] [stderr] 
[INFO] [stderr] error: aborting due to previous error
[INFO] [stderr] 
[INFO] [stderr] error: aborting due to previous error
[INFO] [stderr] 
[INFO] [stderr] error: could not compile `rust_introduction`.
[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 `rust_introduction`.
[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: couldn't read src/07_ownership/toy_vec.rs: No such file or directory (os error 2)
[INFO] [stderr] 
[INFO] [stderr] error: couldn't read src/07_ownership/use_toy_vec.rs: No such file or directory (os error 2)
[INFO] [stderr] 
[INFO] [stderr] error: aborting due to previous error
[INFO] [stderr] 
[INFO] [stderr] error: aborting due to previous error
[INFO] [stderr] 
[INFO] [stderr] error: could not compile `rust_introduction`.
[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 `rust_introduction`.
[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: couldn't read src/07_ownership/03_copy.rs: No such file or directory (os error 2)
[INFO] [stderr] 
[INFO] [stderr] error: aborting due to previous error
[INFO] [stderr] 
[INFO] [stderr] error: couldn't read src/07_ownership/toy_vec.rs: No such file or directory (os error 2)
[INFO] [stderr] 
[INFO] [stderr] error: aborting due to previous error
[INFO] [stderr] 
[INFO] [stderr] error: could not compile `rust_introduction`.
[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 `rust_introduction`.
[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[E0308]: mismatched types
[INFO] [stderr]  --> src/08_trait/03_dispatch.rs:8:34
[INFO] [stderr]   |
[INFO] [stderr] 8 |     <i32 as ToString>::to_string(t)
[INFO] [stderr]   |                                  ^
[INFO] [stderr]   |                                  |
[INFO] [stderr]   |                                  expected `&i32`, found `i32`
[INFO] [stderr]   |                                  help: consider borrowing here: `&t`
[INFO] [stderr] 
[INFO] [stderr] error: aborting due to previous error
[INFO] [stderr] 
[INFO] [stderr] For more information about this error, try `rustc --explain E0308`.
[INFO] [stderr] warning: struct is never constructed: `Polygon`
[INFO] [stderr]  --> src/05_user_defined_types/06_struct.rs:1:8
[INFO] [stderr]   |
[INFO] [stderr] 1 | struct Polygon {
[INFO] [stderr]   |        ^^^^^^^
[INFO] [stderr]   |
[INFO] [stderr]   = note: `#[warn(dead_code)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: struct is never constructed: `Triangle`
[INFO] [stderr]  --> src/05_user_defined_types/06_struct.rs:7:8
[INFO] [stderr]   |
[INFO] [stderr] 7 | struct Triangle(Vertex, Vertex, Vertex);
[INFO] [stderr]   |        ^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: struct is never constructed: `Vertex`
[INFO] [stderr]  --> src/05_user_defined_types/06_struct.rs:8:8
[INFO] [stderr]   |
[INFO] [stderr] 8 | struct Vertex(i32, i32);
[INFO] [stderr]   |        ^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: struct is never constructed: `UniqueValue`
[INFO] [stderr]   --> src/05_user_defined_types/06_struct.rs:10:8
[INFO] [stderr]    |
[INFO] [stderr] 10 | struct UniqueValue;
[INFO] [stderr]    |        ^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] error: could not compile `rust_introduction`.
[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: value passed to `n` is never read
[INFO] [stderr]  --> src/04_primitive/scalar.rs:5:7
[INFO] [stderr]   |
[INFO] [stderr] 5 | fn f1(mut n: u32) {
[INFO] [stderr]   |       ^^^^^
[INFO] [stderr]   |
[INFO] [stderr]   = note: `#[warn(unused_assignments)]` on by default
[INFO] [stderr]   = help: maybe it is overwritten before being read?
[INFO] [stderr] 
[INFO] [stderr] warning: 4 warnings emitted
[INFO] [stderr] 
[INFO] [stderr] warning: 1 warning emitted
[INFO] [stderr] 
[INFO] [stderr] error: build failed
[INFO] running `"docker" "inspect" "85d4d5cef0aa32cab922d5cb76cdfe32c5a05e84721a24606911f9a97fbf2a5d"`
[INFO] running `"docker" "rm" "-f" "85d4d5cef0aa32cab922d5cb76cdfe32c5a05e84721a24606911f9a97fbf2a5d"`
[INFO] [stdout] 85d4d5cef0aa32cab922d5cb76cdfe32c5a05e84721a24606911f9a97fbf2a5d