[INFO] cloning repository dmknght/learn_rust [INFO] running `"git" "clone" "--bare" "git://github.com/dmknght/learn_rust.git" "work/cache/sources/gh/dmknght/learn_rust"` [INFO] [stderr] Cloning into bare repository 'work/cache/sources/gh/dmknght/learn_rust'... [INFO] running `"git" "clone" "work/cache/sources/gh/dmknght/learn_rust" "work/ex/beta-1.37-6/sources/1.36.0/gh/dmknght/learn_rust"` [INFO] [stderr] Cloning into 'work/ex/beta-1.37-6/sources/1.36.0/gh/dmknght/learn_rust'... [INFO] [stderr] done. [INFO] running `"git" "clone" "work/cache/sources/gh/dmknght/learn_rust" "work/ex/beta-1.37-6/sources/beta-2019-07-23/gh/dmknght/learn_rust"` [INFO] [stderr] Cloning into 'work/ex/beta-1.37-6/sources/beta-2019-07-23/gh/dmknght/learn_rust'... [INFO] [stderr] done. [INFO] running `"git" "rev-parse" "HEAD"` [INFO] [stdout] 5309399640754188e2dd406dde559f9a80fa87f7 [INFO] sha for GitHub repo dmknght/learn_rust: 5309399640754188e2dd406dde559f9a80fa87f7 [INFO] validating manifest of dmknght/learn_rust on toolchain 1.36.0 [INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+1.36.0" "read-manifest" "--manifest-path" "Cargo.toml"` [INFO] validating manifest of dmknght/learn_rust on toolchain beta-2019-07-23 [INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+beta-2019-07-23" "read-manifest" "--manifest-path" "Cargo.toml"` [INFO] started frobbing dmknght/learn_rust [INFO] finished frobbing dmknght/learn_rust [INFO] frobbed toml for dmknght/learn_rust written to work/ex/beta-1.37-6/sources/1.36.0/gh/dmknght/learn_rust/Cargo.toml [INFO] started frobbing dmknght/learn_rust [INFO] finished frobbing dmknght/learn_rust [INFO] frobbed toml for dmknght/learn_rust written to work/ex/beta-1.37-6/sources/beta-2019-07-23/gh/dmknght/learn_rust/Cargo.toml [INFO] crate dmknght/learn_rust already has a lockfile, it will not be regenerated [INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+1.36.0" "fetch" "--locked" "--manifest-path" "Cargo.toml"` [INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+beta-2019-07-23" "fetch" "--locked" "--manifest-path" "Cargo.toml"` [INFO] testing dmknght/learn_rust against beta-2019-07-23 for beta-1.37-6 [INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/beta-1.37-6/worker-2/beta-2019-07-23:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/beta-1.37-6/sources/beta-2019-07-23/gh/dmknght/learn_rust:/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=warn" "-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" "+beta-2019-07-23" "build" "--frozen"` [INFO] [stdout] a0739e837a3c4a7a526d53acdc0859619ab9bf5c763ba6998de41fb7e8896db8 [INFO] running `"docker" "start" "-a" "a0739e837a3c4a7a526d53acdc0859619ab9bf5c763ba6998de41fb7e8896db8"` [INFO] [stderr] Compiling learn_rust v0.1.0 (/opt/crater/workdir) [INFO] [stderr] warning: unnecessary parentheses around `while` condition [INFO] [stderr] --> src/main.rs:3:8 [INFO] [stderr] | [INFO] [stderr] 3 | while (x > 0) { [INFO] [stderr] | ^^^^^^^ help: remove these parentheses [INFO] [stderr] | [INFO] [stderr] = note: #[warn(unused_parens)] on by default [INFO] [stderr] [INFO] [stderr] warning: unnecessary parentheses around `if` condition [INFO] [stderr] --> src/main.rs:4:6 [INFO] [stderr] | [INFO] [stderr] 4 | if (x % 2 == 0) [INFO] [stderr] | ^^^^^^^^^^^^ help: remove these parentheses [INFO] [stderr] [INFO] [stderr] warning: unnecessary parentheses around `if` condition [INFO] [stderr] --> src/main.rs:18:6 [INFO] [stderr] | [INFO] [stderr] 18 | if (n % 2 == 0) [INFO] [stderr] | ^^^^^^^^^^^^ help: remove these parentheses [INFO] [stderr] [INFO] [stderr] warning: unnecessary parentheses around `if` condition [INFO] [stderr] --> src/main.rs:32:5 [INFO] [stderr] | [INFO] [stderr] 32 | if (x % 2 == 0) [INFO] [stderr] | ^^^^^^^^^^^^ help: remove these parentheses [INFO] [stderr] [INFO] [stderr] warning: function is never used: `l6_for_loop` [INFO] [stderr] --> src/main.rs:12:1 [INFO] [stderr] | [INFO] [stderr] 12 | fn l6_for_loop() { [INFO] [stderr] | ^^^^^^^^^^^^^^^^ [INFO] [stderr] | [INFO] [stderr] = note: #[warn(dead_code)] on by default [INFO] [stderr] [INFO] [stderr] warning: function is never used: `l5_condition` [INFO] [stderr] --> src/main.rs:26:1 [INFO] [stderr] | [INFO] [stderr] 26 | fn l5_condition() { [INFO] [stderr] | ^^^^^^^^^^^^^^^^^ [INFO] [stderr] [INFO] [stderr] warning: function is never used: `l4_easy_stdin` [INFO] [stderr] --> src/main.rs:38:1 [INFO] [stderr] | [INFO] [stderr] 38 | fn l4_easy_stdin() { [INFO] [stderr] | ^^^^^^^^^^^^^^^^^^ [INFO] [stderr] [INFO] [stderr] warning: function is never used: `l3_change_variable_value` [INFO] [stderr] --> src/main.rs:51:1 [INFO] [stderr] | [INFO] [stderr] 51 | fn l3_change_variable_value() { [INFO] [stderr] | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ [INFO] [stderr] [INFO] [stderr] warning: function is never used: `l2_var_hello_word` [INFO] [stderr] --> src/main.rs:62:1 [INFO] [stderr] | [INFO] [stderr] 62 | fn l2_var_hello_word() { [INFO] [stderr] | ^^^^^^^^^^^^^^^^^^^^^^ [INFO] [stderr] [INFO] [stderr] warning: function is never used: `l1_hello_world` [INFO] [stderr] --> src/main.rs:71:1 [INFO] [stderr] | [INFO] [stderr] 71 | fn l1_hello_world() { [INFO] [stderr] | ^^^^^^^^^^^^^^^^^^^ [INFO] [stderr] [INFO] [stderr] warning: unused `std::result::Result` that must be used [INFO] [stderr] --> src/main.rs:47:2 [INFO] [stderr] | [INFO] [stderr] 47 | reader.read_line(&mut input); [INFO] [stderr] | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ [INFO] [stderr] | [INFO] [stderr] = note: #[warn(unused_must_use)] on by default [INFO] [stderr] = note: this `Result` may be an `Err` variant, which should be handled [INFO] [stderr] [INFO] [stderr] Finished dev [unoptimized + debuginfo] target(s) in 0.68s [INFO] running `"docker" "inspect" "a0739e837a3c4a7a526d53acdc0859619ab9bf5c763ba6998de41fb7e8896db8"` [INFO] running `"docker" "rm" "-f" "a0739e837a3c4a7a526d53acdc0859619ab9bf5c763ba6998de41fb7e8896db8"` [INFO] [stdout] a0739e837a3c4a7a526d53acdc0859619ab9bf5c763ba6998de41fb7e8896db8 [INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/beta-1.37-6/worker-2/beta-2019-07-23:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/beta-1.37-6/sources/beta-2019-07-23/gh/dmknght/learn_rust:/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=warn" "-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" "+beta-2019-07-23" "test" "--frozen" "--no-run"` [INFO] [stdout] 528b1d0c7e015bebf2c440491a67980a8412f86d657cd22a9795b51bc1443afd [INFO] running `"docker" "start" "-a" "528b1d0c7e015bebf2c440491a67980a8412f86d657cd22a9795b51bc1443afd"` [INFO] [stderr] Compiling learn_rust v0.1.0 (/opt/crater/workdir) [INFO] [stderr] warning: unnecessary parentheses around `while` condition [INFO] [stderr] --> src/main.rs:3:8 [INFO] [stderr] | [INFO] [stderr] 3 | while (x > 0) { [INFO] [stderr] | ^^^^^^^ help: remove these parentheses [INFO] [stderr] | [INFO] [stderr] = note: #[warn(unused_parens)] on by default [INFO] [stderr] [INFO] [stderr] warning: unnecessary parentheses around `if` condition [INFO] [stderr] --> src/main.rs:4:6 [INFO] [stderr] | [INFO] [stderr] 4 | if (x % 2 == 0) [INFO] [stderr] | ^^^^^^^^^^^^ help: remove these parentheses [INFO] [stderr] [INFO] [stderr] warning: unnecessary parentheses around `if` condition [INFO] [stderr] --> src/main.rs:18:6 [INFO] [stderr] | [INFO] [stderr] 18 | if (n % 2 == 0) [INFO] [stderr] | ^^^^^^^^^^^^ help: remove these parentheses [INFO] [stderr] [INFO] [stderr] warning: unnecessary parentheses around `if` condition [INFO] [stderr] --> src/main.rs:32:5 [INFO] [stderr] | [INFO] [stderr] 32 | if (x % 2 == 0) [INFO] [stderr] | ^^^^^^^^^^^^ help: remove these parentheses [INFO] [stderr] [INFO] [stderr] warning: function is never used: `l6_for_loop` [INFO] [stderr] --> src/main.rs:12:1 [INFO] [stderr] | [INFO] [stderr] 12 | fn l6_for_loop() { [INFO] [stderr] | ^^^^^^^^^^^^^^^^ [INFO] [stderr] | [INFO] [stderr] = note: #[warn(dead_code)] on by default [INFO] [stderr] [INFO] [stderr] warning: function is never used: `l5_condition` [INFO] [stderr] --> src/main.rs:26:1 [INFO] [stderr] | [INFO] [stderr] 26 | fn l5_condition() { [INFO] [stderr] | ^^^^^^^^^^^^^^^^^ [INFO] [stderr] [INFO] [stderr] warning: function is never used: `l4_easy_stdin` [INFO] [stderr] --> src/main.rs:38:1 [INFO] [stderr] | [INFO] [stderr] 38 | fn l4_easy_stdin() { [INFO] [stderr] | ^^^^^^^^^^^^^^^^^^ [INFO] [stderr] [INFO] [stderr] warning: function is never used: `l3_change_variable_value` [INFO] [stderr] --> src/main.rs:51:1 [INFO] [stderr] | [INFO] [stderr] 51 | fn l3_change_variable_value() { [INFO] [stderr] | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ [INFO] [stderr] [INFO] [stderr] warning: function is never used: `l2_var_hello_word` [INFO] [stderr] --> src/main.rs:62:1 [INFO] [stderr] | [INFO] [stderr] 62 | fn l2_var_hello_word() { [INFO] [stderr] | ^^^^^^^^^^^^^^^^^^^^^^ [INFO] [stderr] [INFO] [stderr] warning: function is never used: `l1_hello_world` [INFO] [stderr] --> src/main.rs:71:1 [INFO] [stderr] | [INFO] [stderr] 71 | fn l1_hello_world() { [INFO] [stderr] | ^^^^^^^^^^^^^^^^^^^ [INFO] [stderr] [INFO] [stderr] warning: unused `std::result::Result` that must be used [INFO] [stderr] --> src/main.rs:47:2 [INFO] [stderr] | [INFO] [stderr] 47 | reader.read_line(&mut input); [INFO] [stderr] | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ [INFO] [stderr] | [INFO] [stderr] = note: #[warn(unused_must_use)] on by default [INFO] [stderr] = note: this `Result` may be an `Err` variant, which should be handled [INFO] [stderr] [INFO] [stderr] Finished dev [unoptimized + debuginfo] target(s) in 0.65s [INFO] running `"docker" "inspect" "528b1d0c7e015bebf2c440491a67980a8412f86d657cd22a9795b51bc1443afd"` [INFO] running `"docker" "rm" "-f" "528b1d0c7e015bebf2c440491a67980a8412f86d657cd22a9795b51bc1443afd"` [INFO] [stdout] 528b1d0c7e015bebf2c440491a67980a8412f86d657cd22a9795b51bc1443afd [INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/beta-1.37-6/worker-2/beta-2019-07-23:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/beta-1.37-6/sources/beta-2019-07-23/gh/dmknght/learn_rust:/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=warn" "-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" "+beta-2019-07-23" "test" "--frozen"` [INFO] [stdout] 3e28f712d6c46e91c37213a1e34a4dfa76993c141bac59e897bc2b34022e74a5 [INFO] running `"docker" "start" "-a" "3e28f712d6c46e91c37213a1e34a4dfa76993c141bac59e897bc2b34022e74a5"` [INFO] [stderr] Finished dev [unoptimized + debuginfo] target(s) in 0.04s [INFO] [stderr] Running /opt/crater/target/debug/deps/learn_rust-d408ecb039f5c6f8 [INFO] [stdout] [INFO] [stdout] running 0 tests [INFO] [stdout] [INFO] [stdout] test result: ok. 0 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out [INFO] [stdout] [INFO] running `"docker" "inspect" "3e28f712d6c46e91c37213a1e34a4dfa76993c141bac59e897bc2b34022e74a5"` [INFO] running `"docker" "rm" "-f" "3e28f712d6c46e91c37213a1e34a4dfa76993c141bac59e897bc2b34022e74a5"` [INFO] [stdout] 3e28f712d6c46e91c37213a1e34a4dfa76993c141bac59e897bc2b34022e74a5