[INFO] updating cached repository https://github.com/akeboshi/rust_study
[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] 3c72c117014684581b8e0e162d5f72fe86d8dbaa
[INFO] checking akeboshi/rust_study against try#e4dba30b9b475d8750370c4dfb49b6541990904d for pr-71393
[INFO] running `"git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fakeboshi%2Frust_study" "/workspace/builds/worker-4/source"`
[INFO] [stderr] Cloning into '/workspace/builds/worker-4/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/akeboshi/rust_study 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/akeboshi/rust_study
[INFO] finished tweaking git repo https://github.com/akeboshi/rust_study
[INFO] tweaked toml for git repo https://github.com/akeboshi/rust_study written to /workspace/builds/worker-4/source/Cargo.toml
[INFO] crate git repo https://github.com/akeboshi/rust_study 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-4/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-4/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] fd426913daf47d811427380914063621388622e5d0a5f0d5a95d3301e2cf8350
[INFO] running `"docker" "start" "-a" "fd426913daf47d811427380914063621388622e5d0a5f0d5a95d3301e2cf8350"`
[INFO] [stderr]     Checking rust_study v0.1.0 (/opt/rustwide/workdir)
[INFO] [stderr] warning: value assigned to `x` is never read
[INFO] [stderr]  --> src/ch03_01.rs:2:9
[INFO] [stderr]   |
[INFO] [stderr] 2 |     let mut x = 5;
[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: function is never used: `return7`
[INFO] [stderr]  --> src/r4_2.rs:3:4
[INFO] [stderr]   |
[INFO] [stderr] 3 | fn return7() -> i32 {
[INFO] [stderr]   |    ^^^^^^^
[INFO] [stderr]   |
[INFO] [stderr]   = note: `#[warn(dead_code)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `ver2_diverges`
[INFO] [stderr]  --> src/r4_2.rs:7:4
[INFO] [stderr]   |
[INFO] [stderr] 7 | fn ver2_diverges() -> ! {
[INFO] [stderr]   |    ^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `mutable_var`
[INFO] [stderr]  --> src/ch03_01.rs:1:4
[INFO] [stderr]   |
[INFO] [stderr] 1 | fn mutable_var() -> i32 {
[INFO] [stderr]   |    ^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: constant item is never used: `MAX_POINTS`
[INFO] [stderr]  --> src/ch03_01.rs:7:1
[INFO] [stderr]   |
[INFO] [stderr] 7 | const MAX_POINTS: u32 = 100_000;
[INFO] [stderr]   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `tuple`
[INFO] [stderr]  --> src/ch03_02.rs:1:4
[INFO] [stderr]   |
[INFO] [stderr] 1 | fn tuple() -> (i32, f64, u8) {
[INFO] [stderr]   |    ^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `array`
[INFO] [stderr]  --> src/ch03_02.rs:5:4
[INFO] [stderr]   |
[INFO] [stderr] 5 | fn array() -> [i32; 6] {
[INFO] [stderr]   |    ^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `control_for`
[INFO] [stderr]  --> src/ch03_05.rs:1:4
[INFO] [stderr]   |
[INFO] [stderr] 1 | fn control_for() {
[INFO] [stderr]   |    ^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `control_loop`
[INFO] [stderr]  --> src/ch03_05.rs:9:4
[INFO] [stderr]   |
[INFO] [stderr] 9 | fn control_loop() {
[INFO] [stderr]   |    ^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `control_while`
[INFO] [stderr]   --> src/ch03_05.rs:20:4
[INFO] [stderr]    |
[INFO] [stderr] 20 | fn control_while() {
[INFO] [stderr]    |    ^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `convet_fahrenheit_to_centigrade`
[INFO] [stderr]  --> src/ch03_traning.rs:1:4
[INFO] [stderr]   |
[INFO] [stderr] 1 | fn convet_fahrenheit_to_centigrade(f: f32) -> f32 {
[INFO] [stderr]   |    ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `fibonacci`
[INFO] [stderr]  --> src/ch03_traning.rs:5:4
[INFO] [stderr]   |
[INFO] [stderr] 5 | fn fibonacci(num: u32) -> u32 {
[INFO] [stderr]   |    ^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `move_string`
[INFO] [stderr]  --> src/ch04_01.rs:1:4
[INFO] [stderr]   |
[INFO] [stderr] 1 | fn move_string() -> String {
[INFO] [stderr]   |    ^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `move_clone`
[INFO] [stderr]   --> src/ch04_01.rs:10:4
[INFO] [stderr]    |
[INFO] [stderr] 10 | fn move_clone() -> (String, String) {
[INFO] [stderr]    |    ^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `copy_primitive_type`
[INFO] [stderr]   --> src/ch04_01.rs:18:4
[INFO] [stderr]    |
[INFO] [stderr] 18 | fn copy_primitive_type(x: i32) -> (i32, i32) {
[INFO] [stderr]    |    ^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `function_ownership`
[INFO] [stderr]   --> src/ch04_01.rs:23:4
[INFO] [stderr]    |
[INFO] [stderr] 23 | fn function_ownership() {
[INFO] [stderr]    |    ^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `takes_ownership`
[INFO] [stderr]   --> src/ch04_01.rs:34:4
[INFO] [stderr]    |
[INFO] [stderr] 34 | fn takes_ownership(some_string: String) {
[INFO] [stderr]    |    ^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `makes_copy`
[INFO] [stderr]   --> src/ch04_01.rs:38:4
[INFO] [stderr]    |
[INFO] [stderr] 38 | fn makes_copy(some_integer: i32) {
[INFO] [stderr]    |    ^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `first_word`
[INFO] [stderr]  --> src/ch04_03.rs:3:4
[INFO] [stderr]   |
[INFO] [stderr] 3 | fn first_word(s: &String) -> usize {
[INFO] [stderr]   |    ^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `string_slice`
[INFO] [stderr]   --> src/ch04_03.rs:15:4
[INFO] [stderr]    |
[INFO] [stderr] 15 | fn string_slice() {
[INFO] [stderr]    |    ^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: 20 warnings emitted
[INFO] [stderr] 
[INFO] [stderr] warning: value assigned to `x` is never read
[INFO] [stderr]  --> src/ch03_01.rs:2:9
[INFO] [stderr]   |
[INFO] [stderr] 2 |     let mut x = 5;
[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: 1 warning emitted
[INFO] [stderr] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 1.08s
[INFO] running `"docker" "inspect" "fd426913daf47d811427380914063621388622e5d0a5f0d5a95d3301e2cf8350"`
[INFO] running `"docker" "rm" "-f" "fd426913daf47d811427380914063621388622e5d0a5f0d5a95d3301e2cf8350"`
[INFO] [stdout] fd426913daf47d811427380914063621388622e5d0a5f0d5a95d3301e2cf8350