[INFO] updating cached repository withoutboats/guessing_game
[INFO] running `"git" "fetch" "--all"`
[INFO] [stdout] Fetching origin
[INFO] [stderr] From git://github.com/withoutboats/guessing_game
[INFO] [stderr]  * branch            HEAD       -> FETCH_HEAD
[INFO] running `"git" "clone" "work/cache/sources/gh/withoutboats/guessing_game" "work/ex/pr-60039-1/sources/master#e305df1846a6d985315917ae0c81b74af8b4e641/gh/withoutboats/guessing_game"`
[INFO] [stderr] Cloning into 'work/ex/pr-60039-1/sources/master#e305df1846a6d985315917ae0c81b74af8b4e641/gh/withoutboats/guessing_game'...
[INFO] [stderr] done.
[INFO] running `"git" "clone" "work/cache/sources/gh/withoutboats/guessing_game" "work/ex/pr-60039-1/sources/try#99a7498759a22b5684caf798a98b7e90ad9d2443/gh/withoutboats/guessing_game"`
[INFO] [stderr] Cloning into 'work/ex/pr-60039-1/sources/try#99a7498759a22b5684caf798a98b7e90ad9d2443/gh/withoutboats/guessing_game'...
[INFO] [stderr] done.
[INFO] running `"git" "rev-parse" "HEAD"`
[INFO] [stdout] ba0cad9d5e9e3b2caedfa6ac6d4826c518280862
[INFO] sha for GitHub repo withoutboats/guessing_game: ba0cad9d5e9e3b2caedfa6ac6d4826c518280862
[INFO] validating manifest of withoutboats/guessing_game on toolchain master#e305df1846a6d985315917ae0c81b74af8b4e641
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+e305df1846a6d985315917ae0c81b74af8b4e641-alt" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] validating manifest of withoutboats/guessing_game on toolchain try#99a7498759a22b5684caf798a98b7e90ad9d2443
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+99a7498759a22b5684caf798a98b7e90ad9d2443-alt" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] started frobbing withoutboats/guessing_game
[INFO] finished frobbing withoutboats/guessing_game
[INFO] frobbed toml for withoutboats/guessing_game written to work/ex/pr-60039-1/sources/master#e305df1846a6d985315917ae0c81b74af8b4e641/gh/withoutboats/guessing_game/Cargo.toml
[INFO] started frobbing withoutboats/guessing_game
[INFO] finished frobbing withoutboats/guessing_game
[INFO] frobbed toml for withoutboats/guessing_game written to work/ex/pr-60039-1/sources/try#99a7498759a22b5684caf798a98b7e90ad9d2443/gh/withoutboats/guessing_game/Cargo.toml
[INFO] crate withoutboats/guessing_game already has a lockfile, it will not be regenerated
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+e305df1846a6d985315917ae0c81b74af8b4e641-alt" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+99a7498759a22b5684caf798a98b7e90ad9d2443-alt" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] checking withoutboats/guessing_game against try#99a7498759a22b5684caf798a98b7e90ad9d2443 for pr-60039-1
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/pr-60039-1/worker-5/try#99a7498759a22b5684caf798a98b7e90ad9d2443:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/pr-60039-1/sources/try#99a7498759a22b5684caf798a98b7e90ad9d2443/gh/withoutboats/guessing_game:/opt/crater/workdir:ro,Z" "-v" "/mnt/big/crater/work/local/cargo-home:/opt/crater/cargo-home:ro,Z" "-v" "/mnt/big/crater/work/local/rustup-home:/opt/crater/rustup-home:ro,Z" "-e" "USER_ID=1000" "-e" "SOURCE_DIR=/opt/crater/workdir" "-e" "MAP_USER_ID=1000" "-e" "CARGO_TARGET_DIR=/opt/crater/target" "-e" "CARGO_INCREMENTAL=0" "-e" "RUST_BACKTRACE=full" "-e" "RUSTFLAGS=--cap-lints=forbid" "-e" "CARGO_HOME=/opt/crater/cargo-home" "-e" "RUSTUP_HOME=/opt/crater/rustup-home" "-w" "/opt/crater/workdir" "-m" "1536M" "--network" "none" "rustops/crates-build-env" "/opt/crater/cargo-home/bin/cargo" "+99a7498759a22b5684caf798a98b7e90ad9d2443-alt" "check" "--frozen" "--all" "--all-targets"`
[INFO] [stdout] 18252f52a94c0ab8d0fa3c4044f4290dc4a0e804667ec11d01b0a423d58ff864
[INFO] running `"docker" "start" "-a" "18252f52a94c0ab8d0fa3c4044f4290dc4a0e804667ec11d01b0a423d58ff864"`
[INFO] [stderr]     Checking guessing_game v0.1.0 (/opt/crater/workdir)
[INFO] [stderr] warning: unused variable: `secret`
[INFO] [stderr]   --> src/secret_number/mod.rs:15:12
[INFO] [stderr]    |
[INFO] [stderr] 15 |     fn new(secret: u16) -> Secret {
[INFO] [stderr]    |            ^^^^^^ help: consider prefixing with an underscore: `_secret`
[INFO] [stderr]    |
[INFO] [stderr]    = note: #[warn(unused_variables)] on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `guess`
[INFO] [stderr]   --> src/secret_number/mod.rs:19:25
[INFO] [stderr]    |
[INFO] [stderr] 19 |     pub fn guess(&self, guess: &str) -> Result<u32, GuessError> {
[INFO] [stderr]    |                         ^^^^^ help: consider prefixing with an underscore: `_guess`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `f`
[INFO] [stderr]   --> src/secret_number/mod.rs:36:19
[INFO] [stderr]    |
[INFO] [stderr] 36 |     fn fmt(&self, f: &mut fmt::Formatter) -> Result<(), fmt::Error> {
[INFO] [stderr]    |                   ^ help: consider prefixing with an underscore: `_f`
[INFO] [stderr] 
[INFO] [stderr] warning: struct is never constructed: `Secret`
[INFO] [stderr]  --> src/secret_number/mod.rs:7:1
[INFO] [stderr]   |
[INFO] [stderr] 7 | pub struct Secret {
[INFO] [stderr]   | ^^^^^^^^^^^^^^^^^
[INFO] [stderr]   |
[INFO] [stderr]   = note: #[warn(dead_code)] on by default
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `random`
[INFO] [stderr]   --> src/secret_number/mod.rs:11:5
[INFO] [stderr]    |
[INFO] [stderr] 11 |     pub fn random() -> Secret {
[INFO] [stderr]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `new`
[INFO] [stderr]   --> src/secret_number/mod.rs:15:5
[INFO] [stderr]    |
[INFO] [stderr] 15 |     fn new(secret: u16) -> Secret {
[INFO] [stderr]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `guess`
[INFO] [stderr]   --> src/secret_number/mod.rs:19:5
[INFO] [stderr]    |
[INFO] [stderr] 19 |     pub fn guess(&self, guess: &str) -> Result<u32, GuessError> {
[INFO] [stderr]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `secret`
[INFO] [stderr]   --> src/secret_number/mod.rs:23:5
[INFO] [stderr]    |
[INFO] [stderr] 23 |     fn secret(&self) -> u16 {
[INFO] [stderr]    |     ^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: variant is never constructed: `TooHigh`
[INFO] [stderr]   --> src/secret_number/mod.rs:30:5
[INFO] [stderr]    |
[INFO] [stderr] 30 |     TooHigh(u16),
[INFO] [stderr]    |     ^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: variant is never constructed: `TooLow`
[INFO] [stderr]   --> src/secret_number/mod.rs:31:5
[INFO] [stderr]    |
[INFO] [stderr] 31 |     TooLow(u16),
[INFO] [stderr]    |     ^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: variant is never constructed: `NotANumber`
[INFO] [stderr]   --> src/secret_number/mod.rs:32:5
[INFO] [stderr]    |
[INFO] [stderr] 32 |     NotANumber,
[INFO] [stderr]    |     ^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `secret`
[INFO] [stderr]   --> src/secret_number/mod.rs:15:12
[INFO] [stderr]    |
[INFO] [stderr] 15 |     fn new(secret: u16) -> Secret {
[INFO] [stderr]    |            ^^^^^^ help: consider prefixing with an underscore: `_secret`
[INFO] [stderr]    |
[INFO] [stderr]    = note: #[warn(unused_variables)] on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `guess`
[INFO] [stderr]   --> src/secret_number/mod.rs:19:25
[INFO] [stderr]    |
[INFO] [stderr] 19 |     pub fn guess(&self, guess: &str) -> Result<u32, GuessError> {
[INFO] [stderr]    |                         ^^^^^ help: consider prefixing with an underscore: `_guess`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `f`
[INFO] [stderr]   --> src/secret_number/mod.rs:36:19
[INFO] [stderr]    |
[INFO] [stderr] 36 |     fn fmt(&self, f: &mut fmt::Formatter) -> Result<(), fmt::Error> {
[INFO] [stderr]    |                   ^ help: consider prefixing with an underscore: `_f`
[INFO] [stderr] 
[INFO] [stderr] warning: variable does not need to be mutable
[INFO] [stderr]   --> src/secret_number/tests.rs:18:9
[INFO] [stderr]    |
[INFO] [stderr] 18 |     let mut secret = Secret::new(0);
[INFO] [stderr]    |         ----^^^^^^
[INFO] [stderr]    |         |
[INFO] [stderr]    |         help: remove this `mut`
[INFO] [stderr]    |
[INFO] [stderr]    = note: #[warn(unused_mut)] on by default
[INFO] [stderr] 
[INFO] [stderr] warning: variable does not need to be mutable
[INFO] [stderr]   --> src/secret_number/tests.rs:24:9
[INFO] [stderr]    |
[INFO] [stderr] 24 |     let mut secret = Secret::new(0);
[INFO] [stderr]    |         ----^^^^^^
[INFO] [stderr]    |         |
[INFO] [stderr]    |         help: remove this `mut`
[INFO] [stderr] 
[INFO] [stderr] warning: variable does not need to be mutable
[INFO] [stderr]   --> src/secret_number/tests.rs:30:9
[INFO] [stderr]    |
[INFO] [stderr] 30 |     let mut secret = Secret::new(1);
[INFO] [stderr]    |         ----^^^^^^
[INFO] [stderr]    |         |
[INFO] [stderr]    |         help: remove this `mut`
[INFO] [stderr] 
[INFO] [stderr] warning: variable does not need to be mutable
[INFO] [stderr]   --> src/secret_number/tests.rs:36:9
[INFO] [stderr]    |
[INFO] [stderr] 36 |     let mut secret = Secret::new(0);
[INFO] [stderr]    |         ----^^^^^^
[INFO] [stderr]    |         |
[INFO] [stderr]    |         help: remove this `mut`
[INFO] [stderr] 
[INFO] [stderr] warning: variable does not need to be mutable
[INFO] [stderr]   --> src/secret_number/tests.rs:42:9
[INFO] [stderr]    |
[INFO] [stderr] 42 |     let mut secret = Secret::new(1);
[INFO] [stderr]    |         ----^^^^^^
[INFO] [stderr]    |         |
[INFO] [stderr]    |         help: remove this `mut`
[INFO] [stderr] 
[INFO] [stderr] warning: variable does not need to be mutable
[INFO] [stderr]   --> src/secret_number/tests.rs:49:9
[INFO] [stderr]    |
[INFO] [stderr] 49 |     let mut secret = Secret::new(0);
[INFO] [stderr]    |         ----^^^^^^
[INFO] [stderr]    |         |
[INFO] [stderr]    |         help: remove this `mut`
[INFO] [stderr] 
[INFO] [stderr] warning: variable does not need to be mutable
[INFO] [stderr]   --> src/secret_number/tests.rs:57:9
[INFO] [stderr]    |
[INFO] [stderr] 57 |     let mut secret = Secret::new(0);
[INFO] [stderr]    |         ----^^^^^^
[INFO] [stderr]    |         |
[INFO] [stderr]    |         help: remove this `mut`
[INFO] [stderr] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 0.58s
[INFO] running `"docker" "inspect" "18252f52a94c0ab8d0fa3c4044f4290dc4a0e804667ec11d01b0a423d58ff864"`
[INFO] running `"docker" "rm" "-f" "18252f52a94c0ab8d0fa3c4044f4290dc4a0e804667ec11d01b0a423d58ff864"`
[INFO] [stdout] 18252f52a94c0ab8d0fa3c4044f4290dc4a0e804667ec11d01b0a423d58ff864