[INFO] updating cached repository https://github.com/jakeec/tcr_kata
[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] 0226bbd8d043eb31f2922ea2135167cd45ee9e66
[INFO] checking jakeec/tcr_kata against try#e4dba30b9b475d8750370c4dfb49b6541990904d for pr-71393
[INFO] running `"git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fjakeec%2Ftcr_kata" "/workspace/builds/worker-12/source"`
[INFO] [stderr] Cloning into '/workspace/builds/worker-12/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/jakeec/tcr_kata 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/jakeec/tcr_kata
[INFO] finished tweaking git repo https://github.com/jakeec/tcr_kata
[INFO] tweaked toml for git repo https://github.com/jakeec/tcr_kata written to /workspace/builds/worker-12/source/Cargo.toml
[INFO] crate git repo https://github.com/jakeec/tcr_kata already has a lockfile, it will not be regenerated
[INFO] running `"/workspace/cargo-home/bin/cargo" "+e4dba30b9b475d8750370c4dfb49b6541990904d" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] running `"docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-12/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-12/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] 8a564df0c4d7c981a35abd773dadb931f76202eb8aed990a7c1f89e8e60b5a1f
[INFO] running `"docker" "start" "-a" "8a564df0c4d7c981a35abd773dadb931f76202eb8aed990a7c1f89e8e60b5a1f"`
[INFO] [stderr]    Compiling memchr v2.3.0
[INFO] [stderr]     Checking lazy_static v1.4.0
[INFO] [stderr]     Checking regex-syntax v0.6.14
[INFO] [stderr]     Checking thread_local v1.0.1
[INFO] [stderr]     Checking aho-corasick v0.7.7
[INFO] [stderr]     Checking regex v1.3.4
[INFO] [stderr]     Checking tcr_kata v0.1.0 (/opt/rustwide/workdir)
[INFO] [stderr] warning: variant is never constructed: `ArgumentNotValid`
[INFO] [stderr]  --> src/string_adder.rs:3:5
[INFO] [stderr]   |
[INFO] [stderr] 3 |     ArgumentNotValid(String),
[INFO] [stderr]   |     ^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]   |
[INFO] [stderr]   = note: `#[warn(dead_code)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `string_add`
[INFO] [stderr]  --> src/string_adder.rs:6:4
[INFO] [stderr]   |
[INFO] [stderr] 6 | fn string_add(a: &str, b: &str) -> Result<String, StringAddError> {
[INFO] [stderr]   |    ^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `hex_string_add`
[INFO] [stderr]   --> src/string_adder.rs:35:4
[INFO] [stderr]    |
[INFO] [stderr] 35 | fn hex_string_add(a: &str, b: &str) -> Result<String, StringAddError> {
[INFO] [stderr]    |    ^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: 3 warnings emitted
[INFO] [stderr] 
[INFO] [stderr] warning: variant is never constructed: `ArgumentNotValid`
[INFO] [stderr]  --> src/string_adder.rs:3:5
[INFO] [stderr]   |
[INFO] [stderr] 3 |     ArgumentNotValid(String),
[INFO] [stderr]   |     ^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]   |
[INFO] [stderr]   = note: `#[warn(dead_code)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: function `given_0x0F_0x0F_return_145709` should have a snake case name
[INFO] [stderr]    --> src/string_adder.rs:120:12
[INFO] [stderr]     |
[INFO] [stderr] 120 |         fn given_0x0F_0x0F_return_145709() {
[INFO] [stderr]     |            ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: convert the identifier to snake case: `given_0x0_f_0x0_f_return_145709`
[INFO] [stderr]     |
[INFO] [stderr]     = note: `#[warn(non_snake_case)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: 2 warnings emitted
[INFO] [stderr] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 8.43s
[INFO] running `"docker" "inspect" "8a564df0c4d7c981a35abd773dadb931f76202eb8aed990a7c1f89e8e60b5a1f"`
[INFO] running `"docker" "rm" "-f" "8a564df0c4d7c981a35abd773dadb931f76202eb8aed990a7c1f89e8e60b5a1f"`
[INFO] [stdout] 8a564df0c4d7c981a35abd773dadb931f76202eb8aed990a7c1f89e8e60b5a1f