[INFO] updating cached repository sleibrock/rust-calculus
[INFO] running `"git" "fetch" "--all"`
[INFO] [stdout] Fetching origin
[INFO] [stderr] From git://github.com/sleibrock/rust-calculus
[INFO] [stderr]  * branch            HEAD       -> FETCH_HEAD
[INFO] running `"git" "clone" "work/cache/sources/gh/sleibrock/rust-calculus" "work/ex/beta-1.38-1/sources/1.37.0/gh/sleibrock/rust-calculus"`
[INFO] [stderr] Cloning into 'work/ex/beta-1.38-1/sources/1.37.0/gh/sleibrock/rust-calculus'...
[INFO] [stderr] done.
[INFO] running `"git" "clone" "work/cache/sources/gh/sleibrock/rust-calculus" "work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/sleibrock/rust-calculus"`
[INFO] [stderr] Cloning into 'work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/sleibrock/rust-calculus'...
[INFO] [stderr] done.
[INFO] running `"git" "rev-parse" "HEAD"`
[INFO] [stdout] f34eb42c2db0f7006f7b9bdca687c231b35e628e
[INFO] sha for GitHub repo sleibrock/rust-calculus: f34eb42c2db0f7006f7b9bdca687c231b35e628e
[INFO] validating manifest of sleibrock/rust-calculus 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 sleibrock/rust-calculus 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 sleibrock/rust-calculus
[INFO] finished frobbing sleibrock/rust-calculus
[INFO] frobbed toml for sleibrock/rust-calculus written to work/ex/beta-1.38-1/sources/1.37.0/gh/sleibrock/rust-calculus/Cargo.toml
[INFO] started frobbing sleibrock/rust-calculus
[INFO] finished frobbing sleibrock/rust-calculus
[INFO] frobbed toml for sleibrock/rust-calculus written to work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/sleibrock/rust-calculus/Cargo.toml
[INFO] crate sleibrock/rust-calculus 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] [stderr]     Blocking waiting for file lock on package cache
[INFO] testing sleibrock/rust-calculus 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/sleibrock/rust-calculus:/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] 0400a0d4f04276510a2e8008b9537b29d503c4b10ef20fe010d7807effe5a9fc
[INFO] running `"docker" "start" "-a" "0400a0d4f04276510a2e8008b9537b29d503c4b10ef20fe010d7807effe5a9fc"`
[INFO] [stderr]    Compiling rust-calculus v0.1.0 (/opt/crater/workdir)
[INFO] [stderr] warning: unused variable: `exp2`
[INFO] [stderr]    --> src/derive.rs:112:17
[INFO] [stderr]     |
[INFO] [stderr] 112 |             let exp2 = unpack(expression);
[INFO] [stderr]     |                 ^^^^ help: consider prefixing with an underscore: `_exp2`
[INFO] [stderr]     |
[INFO] [stderr]     = note: #[warn(unused_variables)] on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `exp3`
[INFO] [stderr]    --> src/derive.rs:113:17
[INFO] [stderr]     |
[INFO] [stderr] 113 |             let exp3 = unpack(expression);
[INFO] [stderr]     |                 ^^^^ help: consider prefixing with an underscore: `_exp3`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `c`
[INFO] [stderr]    --> src/derive.rs:120:27
[INFO] [stderr]     |
[INFO] [stderr] 120 |                 Expr::Var(c) => {
[INFO] [stderr]     |                           ^ help: consider prefixing with an underscore: `_c`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `expression`
[INFO] [stderr]    --> src/derive.rs:128:23
[INFO] [stderr]     |
[INFO] [stderr] 128 |         Expr::Cos(ref expression) => {
[INFO] [stderr]     |                       ^^^^^^^^^^ help: consider prefixing with an underscore: `_expression`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `power2`
[INFO] [stderr]    --> src/derive.rs:139:17
[INFO] [stderr]     |
[INFO] [stderr] 139 |             let power2 = unpack(power);
[INFO] [stderr]     |                 ^^^^^^ help: consider prefixing with an underscore: `_power2`
[INFO] [stderr] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 1.32s
[INFO] running `"docker" "inspect" "0400a0d4f04276510a2e8008b9537b29d503c4b10ef20fe010d7807effe5a9fc"`
[INFO] running `"docker" "rm" "-f" "0400a0d4f04276510a2e8008b9537b29d503c4b10ef20fe010d7807effe5a9fc"`
[INFO] [stdout] 0400a0d4f04276510a2e8008b9537b29d503c4b10ef20fe010d7807effe5a9fc
[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/sleibrock/rust-calculus:/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] 72f86139d43b0146905d767679d0d7b0e0e712e0a5f448889cd9fb36c6ca54a5
[INFO] running `"docker" "start" "-a" "72f86139d43b0146905d767679d0d7b0e0e712e0a5f448889cd9fb36c6ca54a5"`
[INFO] [stderr]    Compiling rust-calculus v0.1.0 (/opt/crater/workdir)
[INFO] [stderr] warning: unused variable: `exp2`
[INFO] [stderr]    --> src/derive.rs:112:17
[INFO] [stderr]     |
[INFO] [stderr] 112 |             let exp2 = unpack(expression);
[INFO] [stderr]     |                 ^^^^ help: consider prefixing with an underscore: `_exp2`
[INFO] [stderr]     |
[INFO] [stderr]     = note: #[warn(unused_variables)] on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `exp3`
[INFO] [stderr]    --> src/derive.rs:113:17
[INFO] [stderr]     |
[INFO] [stderr] 113 |             let exp3 = unpack(expression);
[INFO] [stderr]     |                 ^^^^ help: consider prefixing with an underscore: `_exp3`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `c`
[INFO] [stderr]    --> src/derive.rs:120:27
[INFO] [stderr]     |
[INFO] [stderr] 120 |                 Expr::Var(c) => {
[INFO] [stderr]     |                           ^ help: consider prefixing with an underscore: `_c`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `expression`
[INFO] [stderr]    --> src/derive.rs:128:23
[INFO] [stderr]     |
[INFO] [stderr] 128 |         Expr::Cos(ref expression) => {
[INFO] [stderr]     |                       ^^^^^^^^^^ help: consider prefixing with an underscore: `_expression`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `power2`
[INFO] [stderr]    --> src/derive.rs:139:17
[INFO] [stderr]     |
[INFO] [stderr] 139 |             let power2 = unpack(power);
[INFO] [stderr]     |                 ^^^^^^ help: consider prefixing with an underscore: `_power2`
[INFO] [stderr] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 1.05s
[INFO] running `"docker" "inspect" "72f86139d43b0146905d767679d0d7b0e0e712e0a5f448889cd9fb36c6ca54a5"`
[INFO] running `"docker" "rm" "-f" "72f86139d43b0146905d767679d0d7b0e0e712e0a5f448889cd9fb36c6ca54a5"`
[INFO] [stdout] 72f86139d43b0146905d767679d0d7b0e0e712e0a5f448889cd9fb36c6ca54a5
[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/sleibrock/rust-calculus:/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] bfea26d0949f0ec0b44cdb224e4bfe000ea5f814d267a2c093c5a8ee1bd08fd3
[INFO] running `"docker" "start" "-a" "bfea26d0949f0ec0b44cdb224e4bfe000ea5f814d267a2c093c5a8ee1bd08fd3"`
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 0.05s
[INFO] [stderr]      Running /opt/crater/target/debug/deps/rust_calculus-c06416de60a1dcfc
[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] [stderr]      Running /opt/crater/target/debug/deps/rust_calculus-d28c87a6c31525f1
[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] [stderr]    Doc-tests rust-calculus
[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" "bfea26d0949f0ec0b44cdb224e4bfe000ea5f814d267a2c093c5a8ee1bd08fd3"`
[INFO] running `"docker" "rm" "-f" "bfea26d0949f0ec0b44cdb224e4bfe000ea5f814d267a2c093c5a8ee1bd08fd3"`
[INFO] [stdout] bfea26d0949f0ec0b44cdb224e4bfe000ea5f814d267a2c093c5a8ee1bd08fd3