[INFO] updating cached repository https://github.com/bookinstock/rust_example
[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] c83d144f2d500cd60a59da5019b4bc5ca7d2d36f
[INFO] checking bookinstock/rust_example against try#4662032ab74cd44d423120d08d251dfead4914a0 for pr-72788
[INFO] running `"git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fbookinstock%2Frust_example" "/workspace/builds/worker-8/source"`
[INFO] [stderr] Cloning into '/workspace/builds/worker-8/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/bookinstock/rust_example on toolchain 4662032ab74cd44d423120d08d251dfead4914a0
[INFO] running `"/workspace/cargo-home/bin/cargo" "+4662032ab74cd44d423120d08d251dfead4914a0" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] started tweaking git repo https://github.com/bookinstock/rust_example
[INFO] finished tweaking git repo https://github.com/bookinstock/rust_example
[INFO] tweaked toml for git repo https://github.com/bookinstock/rust_example written to /workspace/builds/worker-8/source/Cargo.toml
[INFO] crate git repo https://github.com/bookinstock/rust_example already has a lockfile, it will not be regenerated
[INFO] running `"/workspace/cargo-home/bin/cargo" "+4662032ab74cd44d423120d08d251dfead4914a0" "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-8/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-8/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" "+4662032ab74cd44d423120d08d251dfead4914a0" "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] 31bb4ef5e0add3d84a923756c19f4980ca1d4a46b15f74c6fec892ef63558999
[INFO] running `"docker" "start" "-a" "31bb4ef5e0add3d84a923756c19f4980ca1d4a46b15f74c6fec892ef63558999"`
[INFO] [stderr] sudo: setrlimit(RLIMIT_CORE): Operation not permitted
[INFO] [stderr]     Checking rust_example v0.1.0 (/opt/rustwide/workdir)
[INFO] [stderr] error[E0601]: `main` function not found in crate `test`
[INFO] [stderr]   --> src/bin/test.rs:13:4
[INFO] [stderr]    |
[INFO] [stderr] 13 | */
[INFO] [stderr]    |    ^ consider adding a `main` function to `src/bin/test.rs`
[INFO] [stderr] 
[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[E0601]: `main` function not found in crate `std`
[INFO] [stderr]   --> src/bin/std.rs:64:4
[INFO] [stderr]    |
[INFO] [stderr] 64 | */
[INFO] [stderr]    |    ^ consider adding a `main` function to `src/bin/std.rs`
[INFO] [stderr] 
[INFO] [stderr] error: could not compile `rust_example`.
[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: aborting due to previous error
[INFO] [stderr] 
[INFO] [stderr] For more information about this error, try `rustc --explain E0601`.
[INFO] [stderr] warning: unused variable: `noisy_unused_variable`
[INFO] [stderr]   --> src/bin/var_binding.rs:26:9
[INFO] [stderr]    |
[INFO] [stderr] 26 |     let noisy_unused_variable = 2u32;
[INFO] [stderr]    |         ^^^^^^^^^^^^^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_noisy_unused_variable`
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(unused_variables)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `test_literal`
[INFO] [stderr]    --> src/bin/pattern_matching.rs:113:4
[INFO] [stderr]     |
[INFO] [stderr] 113 | fn test_literal() {}
[INFO] [stderr]     |    ^^^^^^^^^^^^
[INFO] [stderr]     |
[INFO] [stderr]     = note: `#[warn(dead_code)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: struct is never constructed: `Nil`
[INFO] [stderr]   --> src/bin/custom_type.rs:30:8
[INFO] [stderr]    |
[INFO] [stderr] 30 | struct Nil;
[INFO] [stderr]    |        ^^^
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(dead_code)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: variant is never constructed: `Rich`
[INFO] [stderr]    --> src/bin/custom_type.rs:117:9
[INFO] [stderr]     |
[INFO] [stderr] 117 |         Rich,
[INFO] [stderr]     |         ^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `test_array`
[INFO] [stderr]    --> src/bin/pattern_matching.rs:115:4
[INFO] [stderr]     |
[INFO] [stderr] 115 | fn test_array() {}
[INFO] [stderr]     |    ^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `test_enum`
[INFO] [stderr]    --> src/bin/pattern_matching.rs:117:4
[INFO] [stderr]     |
[INFO] [stderr] 117 | fn test_enum() {}
[INFO] [stderr]     |    ^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `test_stuct`
[INFO] [stderr]    --> src/bin/pattern_matching.rs:119:4
[INFO] [stderr]     |
[INFO] [stderr] 119 | fn test_stuct() {}
[INFO] [stderr]     |    ^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `test_variable`
[INFO] [stderr]    --> src/bin/pattern_matching.rs:137:4
[INFO] [stderr]     |
[INFO] [stderr] 137 | fn test_variable() {}
[INFO] [stderr]     |    ^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `test_wildcard`
[INFO] [stderr]    --> src/bin/pattern_matching.rs:139:4
[INFO] [stderr]     |
[INFO] [stderr] 139 | fn test_wildcard() {}
[INFO] [stderr]     |    ^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `test_placeholder`
[INFO] [stderr]    --> src/bin/pattern_matching.rs:141:4
[INFO] [stderr]     |
[INFO] [stderr] 141 | fn test_placeholder() {}
[INFO] [stderr]     |    ^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: variant is never constructed: `Soldier`
[INFO] [stderr]    --> src/bin/custom_type.rs:123:9
[INFO] [stderr]     |
[INFO] [stderr] 123 |         Soldier,
[INFO] [stderr]     |         ^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: 3 warnings emitted
[INFO] [stderr] 
[INFO] [stderr] warning: 7 warnings emitted
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `ttt`
[INFO] [stderr]    --> src/bin/hello.rs:107:4
[INFO] [stderr]     |
[INFO] [stderr] 107 | fn ttt() {
[INFO] [stderr]     |    ^^^
[INFO] [stderr]     |
[INFO] [stderr]     = note: `#[warn(dead_code)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `f`
[INFO] [stderr]    --> src/bin/hello.rs:120:4
[INFO] [stderr]     |
[INFO] [stderr] 120 | fn f() {
[INFO] [stderr]     |    ^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `test`
[INFO] [stderr]    --> src/bin/hello.rs:124:4
[INFO] [stderr]     |
[INFO] [stderr] 124 | fn test() {
[INFO] [stderr]     |    ^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `try_debug_trait`
[INFO] [stderr]    --> src/bin/hello.rs:159:4
[INFO] [stderr]     |
[INFO] [stderr] 159 | fn try_debug_trait() {
[INFO] [stderr]     |    ^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `s`
[INFO] [stderr]    --> src/bin/generic.rs:217:9
[INFO] [stderr]     |
[INFO] [stderr] 217 |     let s = S(1);
[INFO] [stderr]     |         ^ help: if this is intentional, prefix it with an underscore: `_s`
[INFO] [stderr]     |
[INFO] [stderr]     = note: `#[warn(unused_variables)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: 1 warning emitted
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `ttt`
[INFO] [stderr]    --> src/bin/hello.rs:107:4
[INFO] [stderr]     |
[INFO] [stderr] 107 | fn ttt() {
[INFO] [stderr]     |    ^^^
[INFO] [stderr]     |
[INFO] [stderr]     = note: `#[warn(dead_code)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `f`
[INFO] [stderr]    --> src/bin/hello.rs:120:4
[INFO] [stderr]     |
[INFO] [stderr] 120 | fn f() {
[INFO] [stderr]     |    ^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `test`
[INFO] [stderr]    --> src/bin/hello.rs:124:4
[INFO] [stderr]     |
[INFO] [stderr] 124 | fn test() {
[INFO] [stderr]     |    ^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `try_debug_trait`
[INFO] [stderr]    --> src/bin/hello.rs:159:4
[INFO] [stderr]     |
[INFO] [stderr] 159 | fn try_debug_trait() {
[INFO] [stderr]     |    ^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: 4 warnings emitted
[INFO] [stderr] 
[INFO] [stderr] warning: 4 warnings emitted
[INFO] [stderr] 
[INFO] [stderr] warning: struct is never constructed: `S`
[INFO] [stderr]    --> src/bin/generic.rs:135:12
[INFO] [stderr]     |
[INFO] [stderr] 135 |     struct S; // 具体类型 `S`
[INFO] [stderr]     |            ^
[INFO] [stderr]     |
[INFO] [stderr]     = note: `#[warn(dead_code)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: struct is never constructed: `GenericVal`
[INFO] [stderr]    --> src/bin/generic.rs:136:12
[INFO] [stderr]     |
[INFO] [stderr] 136 |     struct GenericVal<T>(T); // 泛型类型 `GenericVal`
[INFO] [stderr]     |            ^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `printer`
[INFO] [stderr]    --> src/bin/generic.rs:210:8
[INFO] [stderr]     |
[INFO] [stderr] 210 |     fn printer<T: Display>(t: T) {
[INFO] [stderr]     |        ^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: 4 warnings emitted
[INFO] [stderr] 
[INFO] [stderr] error: build failed
[INFO] running `"docker" "inspect" "31bb4ef5e0add3d84a923756c19f4980ca1d4a46b15f74c6fec892ef63558999"`
[INFO] running `"docker" "rm" "-f" "31bb4ef5e0add3d84a923756c19f4980ca1d4a46b15f74c6fec892ef63558999"`
[INFO] [stdout] 31bb4ef5e0add3d84a923756c19f4980ca1d4a46b15f74c6fec892ef63558999