[INFO] updating cached repository richardfontana/mimosa
[INFO] running `"git" "fetch" "--all"`
[INFO] [stdout] Fetching origin
[INFO] [stderr] From git://github.com/richardfontana/mimosa
[INFO] [stderr]  * branch            HEAD       -> FETCH_HEAD
[INFO] running `"git" "clone" "work/cache/sources/gh/richardfontana/mimosa" "work/ex/beta-1.38-1/sources/1.37.0/gh/richardfontana/mimosa"`
[INFO] [stderr] Cloning into 'work/ex/beta-1.38-1/sources/1.37.0/gh/richardfontana/mimosa'...
[INFO] [stderr] done.
[INFO] running `"git" "clone" "work/cache/sources/gh/richardfontana/mimosa" "work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/richardfontana/mimosa"`
[INFO] [stderr] Cloning into 'work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/richardfontana/mimosa'...
[INFO] [stderr] done.
[INFO] running `"git" "rev-parse" "HEAD"`
[INFO] [stdout] 32fba1b14952aeba1cdf9d7897ea6c9cea022e70
[INFO] sha for GitHub repo richardfontana/mimosa: 32fba1b14952aeba1cdf9d7897ea6c9cea022e70
[INFO] validating manifest of richardfontana/mimosa 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 richardfontana/mimosa 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 richardfontana/mimosa
[INFO] finished frobbing richardfontana/mimosa
[INFO] frobbed toml for richardfontana/mimosa written to work/ex/beta-1.38-1/sources/1.37.0/gh/richardfontana/mimosa/Cargo.toml
[INFO] started frobbing richardfontana/mimosa
[INFO] finished frobbing richardfontana/mimosa
[INFO] frobbed toml for richardfontana/mimosa written to work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/richardfontana/mimosa/Cargo.toml
[INFO] crate richardfontana/mimosa 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] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+beta-2019-08-13" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] testing richardfontana/mimosa against 1.37.0 for beta-1.38-1
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/beta-1.38-1/worker-6/1.37.0:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/beta-1.38-1/sources/1.37.0/gh/richardfontana/mimosa:/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" "+1.37.0" "build" "--frozen"`
[INFO] [stdout] 04d698baa0c7f62aaa04836c183cf654c3f3da5f650afcb39ad754681ebc51ad
[INFO] running `"docker" "start" "-a" "04d698baa0c7f62aaa04836c183cf654c3f3da5f650afcb39ad754681ebc51ad"`
[INFO] [stderr]    Compiling mimosa v0.1.0 (/opt/crater/workdir)
[INFO] [stderr] warning: unused variable: `v`
[INFO] [stderr]   --> src/main.rs:26:17
[INFO] [stderr]    |
[INFO] [stderr] 26 |             let v = reduce_to_comments(s, delims);
[INFO] [stderr]    |                 ^ help: consider prefixing with an underscore: `_v`
[INFO] [stderr]    |
[INFO] [stderr]    = note: #[warn(unused_variables)] on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `s`
[INFO] [stderr]   --> src/main.rs:55:23
[INFO] [stderr]    |
[INFO] [stderr] 55 | fn reduce_to_comments(s: String, ds: CommentDelimiters) -> Vec<String> {
[INFO] [stderr]    |                       ^ help: consider prefixing with an underscore: `_s`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `ds`
[INFO] [stderr]   --> src/main.rs:55:34
[INFO] [stderr]    |
[INFO] [stderr] 55 | fn reduce_to_comments(s: String, ds: CommentDelimiters) -> Vec<String> {
[INFO] [stderr]    |                                  ^^ help: consider prefixing with an underscore: `_ds`
[INFO] [stderr] 
[INFO] [stderr] warning: field is never used: `begin`
[INFO] [stderr]   --> src/main.rs:12:5
[INFO] [stderr]    |
[INFO] [stderr] 12 |     begin: &'static str,
[INFO] [stderr]    |     ^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = note: #[warn(dead_code)] on by default
[INFO] [stderr] 
[INFO] [stderr] warning: field is never used: `end`
[INFO] [stderr]   --> src/main.rs:13:5
[INFO] [stderr]    |
[INFO] [stderr] 13 |     end: &'static str,
[INFO] [stderr]    |     ^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unused `std::result::Result` that must be used
[INFO] [stderr]   --> src/main.rs:25:13
[INFO] [stderr]    |
[INFO] [stderr] 25 |             fr.read_to_string(&mut s);
[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 0.39s
[INFO] running `"docker" "inspect" "04d698baa0c7f62aaa04836c183cf654c3f3da5f650afcb39ad754681ebc51ad"`
[INFO] running `"docker" "rm" "-f" "04d698baa0c7f62aaa04836c183cf654c3f3da5f650afcb39ad754681ebc51ad"`
[INFO] [stdout] 04d698baa0c7f62aaa04836c183cf654c3f3da5f650afcb39ad754681ebc51ad
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/beta-1.38-1/worker-6/1.37.0:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/beta-1.38-1/sources/1.37.0/gh/richardfontana/mimosa:/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" "+1.37.0" "test" "--frozen" "--no-run"`
[INFO] [stdout] 63fac9e63e835994865276bfd237b488f07eef85d566fdcfb76f1ddbd6398e59
[INFO] running `"docker" "start" "-a" "63fac9e63e835994865276bfd237b488f07eef85d566fdcfb76f1ddbd6398e59"`
[INFO] [stderr]    Compiling mimosa v0.1.0 (/opt/crater/workdir)
[INFO] [stderr] warning: unused variable: `v`
[INFO] [stderr]   --> src/main.rs:26:17
[INFO] [stderr]    |
[INFO] [stderr] 26 |             let v = reduce_to_comments(s, delims);
[INFO] [stderr]    |                 ^ help: consider prefixing with an underscore: `_v`
[INFO] [stderr]    |
[INFO] [stderr]    = note: #[warn(unused_variables)] on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `s`
[INFO] [stderr]   --> src/main.rs:55:23
[INFO] [stderr]    |
[INFO] [stderr] 55 | fn reduce_to_comments(s: String, ds: CommentDelimiters) -> Vec<String> {
[INFO] [stderr]    |                       ^ help: consider prefixing with an underscore: `_s`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `ds`
[INFO] [stderr]   --> src/main.rs:55:34
[INFO] [stderr]    |
[INFO] [stderr] 55 | fn reduce_to_comments(s: String, ds: CommentDelimiters) -> Vec<String> {
[INFO] [stderr]    |                                  ^^ help: consider prefixing with an underscore: `_ds`
[INFO] [stderr] 
[INFO] [stderr] warning: field is never used: `begin`
[INFO] [stderr]   --> src/main.rs:12:5
[INFO] [stderr]    |
[INFO] [stderr] 12 |     begin: &'static str,
[INFO] [stderr]    |     ^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = note: #[warn(dead_code)] on by default
[INFO] [stderr] 
[INFO] [stderr] warning: field is never used: `end`
[INFO] [stderr]   --> src/main.rs:13:5
[INFO] [stderr]    |
[INFO] [stderr] 13 |     end: &'static str,
[INFO] [stderr]    |     ^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unused `std::result::Result` that must be used
[INFO] [stderr]   --> src/main.rs:25:13
[INFO] [stderr]    |
[INFO] [stderr] 25 |             fr.read_to_string(&mut s);
[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 0.33s
[INFO] running `"docker" "inspect" "63fac9e63e835994865276bfd237b488f07eef85d566fdcfb76f1ddbd6398e59"`
[INFO] running `"docker" "rm" "-f" "63fac9e63e835994865276bfd237b488f07eef85d566fdcfb76f1ddbd6398e59"`
[INFO] [stdout] 63fac9e63e835994865276bfd237b488f07eef85d566fdcfb76f1ddbd6398e59
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/beta-1.38-1/worker-6/1.37.0:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/beta-1.38-1/sources/1.37.0/gh/richardfontana/mimosa:/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" "+1.37.0" "test" "--frozen"`
[INFO] [stdout] 5ad1e26a26a15dad5d92beb599328efec2074299af31ab519b21b8fdf4ea83c9
[INFO] running `"docker" "start" "-a" "5ad1e26a26a15dad5d92beb599328efec2074299af31ab519b21b8fdf4ea83c9"`
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 0.01s
[INFO] [stderr]      Running /opt/crater/target/debug/deps/mimosa-91da93a7eaacdbf4
[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" "5ad1e26a26a15dad5d92beb599328efec2074299af31ab519b21b8fdf4ea83c9"`
[INFO] running `"docker" "rm" "-f" "5ad1e26a26a15dad5d92beb599328efec2074299af31ab519b21b8fdf4ea83c9"`
[INFO] [stdout] 5ad1e26a26a15dad5d92beb599328efec2074299af31ab519b21b8fdf4ea83c9