[INFO] updating cached repository dmknght/learn_rust [INFO] running `"git" "fetch" "--all"` [INFO] [stdout] Fetching origin [INFO] [stderr] From git://github.com/dmknght/learn_rust [INFO] [stderr] * branch HEAD -> FETCH_HEAD [INFO] running `"git" "clone" "work/cache/sources/gh/dmknght/learn_rust" "work/ex/beta-1.38-1/sources/1.37.0/gh/dmknght/learn_rust"` [INFO] [stderr] Cloning into 'work/ex/beta-1.38-1/sources/1.37.0/gh/dmknght/learn_rust'... [INFO] [stderr] done. [INFO] running `"git" "clone" "work/cache/sources/gh/dmknght/learn_rust" "work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/dmknght/learn_rust"` [INFO] [stderr] Cloning into 'work/ex/beta-1.38-1/sources/beta-2019-08-13/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 1.37.0 [INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+1.37.0" "read-manifest" "--manifest-path" "Cargo.toml"` [INFO] validating manifest of dmknght/learn_rust on toolchain beta-2019-08-13 [INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+beta-2019-08-13" "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-1.38-1/sources/1.37.0/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-1.38-1/sources/beta-2019-08-13/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" "+1.37.0" "fetch" "--locked" "--manifest-path" "Cargo.toml"` [INFO] [stderr] Blocking waiting for file lock on package cache [INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+beta-2019-08-13" "fetch" "--locked" "--manifest-path" "Cargo.toml"` [INFO] testing dmknght/learn_rust against beta-2019-08-13 for beta-1.38-1 [INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/beta-1.38-1/worker-6/beta-2019-08-13:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/beta-1.38-1/sources/beta-2019-08-13/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-2019-08-13" "build" "--frozen"` [INFO] [stdout] 897dcc99d79711002f2903cf4ee9adb50e32649a3f93a9216471c3ddf7eb17e9 [INFO] running `"docker" "start" "-a" "897dcc99d79711002f2903cf4ee9adb50e32649a3f93a9216471c3ddf7eb17e9"` [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 0.57s [INFO] running `"docker" "inspect" "897dcc99d79711002f2903cf4ee9adb50e32649a3f93a9216471c3ddf7eb17e9"` [INFO] running `"docker" "rm" "-f" "897dcc99d79711002f2903cf4ee9adb50e32649a3f93a9216471c3ddf7eb17e9"` [INFO] [stdout] 897dcc99d79711002f2903cf4ee9adb50e32649a3f93a9216471c3ddf7eb17e9 [INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/beta-1.38-1/worker-6/beta-2019-08-13:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/beta-1.38-1/sources/beta-2019-08-13/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-2019-08-13" "test" "--frozen" "--no-run"` [INFO] [stdout] cb817402b289c9a7200e7c7f667cb174a1d6af7b75a2114846f0040ca14cfdfb [INFO] running `"docker" "start" "-a" "cb817402b289c9a7200e7c7f667cb174a1d6af7b75a2114846f0040ca14cfdfb"` [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 0.59s [INFO] running `"docker" "inspect" "cb817402b289c9a7200e7c7f667cb174a1d6af7b75a2114846f0040ca14cfdfb"` [INFO] running `"docker" "rm" "-f" "cb817402b289c9a7200e7c7f667cb174a1d6af7b75a2114846f0040ca14cfdfb"` [INFO] [stdout] cb817402b289c9a7200e7c7f667cb174a1d6af7b75a2114846f0040ca14cfdfb [INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/beta-1.38-1/worker-6/beta-2019-08-13:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/beta-1.38-1/sources/beta-2019-08-13/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-2019-08-13" "test" "--frozen"` [INFO] [stdout] dc5ccc94a83ea19c9d72f53e76cb935361f6c37dafc959ebc3e27b11f0d93a50 [INFO] running `"docker" "start" "-a" "dc5ccc94a83ea19c9d72f53e76cb935361f6c37dafc959ebc3e27b11f0d93a50"` [INFO] [stderr] Finished dev [unoptimized + debuginfo] target(s) in 0.02s [INFO] [stderr] Running /opt/crater/target/debug/deps/learn_rust-87f13d19079e10cc [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" "dc5ccc94a83ea19c9d72f53e76cb935361f6c37dafc959ebc3e27b11f0d93a50"` [INFO] running `"docker" "rm" "-f" "dc5ccc94a83ea19c9d72f53e76cb935361f6c37dafc959ebc3e27b11f0d93a50"` [INFO] [stdout] dc5ccc94a83ea19c9d72f53e76cb935361f6c37dafc959ebc3e27b11f0d93a50