[INFO] crate r4 1.0.1 is already in cache
[INFO] extracting crate r4 1.0.1 into work/ex/beta-1.38-1/sources/1.37.0/reg/r4/1.0.1
[INFO] extracting crate r4 1.0.1 into work/ex/beta-1.38-1/sources/beta-2019-08-13/reg/r4/1.0.1
[INFO] validating manifest of r4-1.0.1 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 r4-1.0.1 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 r4-1.0.1
[INFO] finished frobbing r4-1.0.1
[INFO] frobbed toml for r4-1.0.1 written to work/ex/beta-1.38-1/sources/1.37.0/reg/r4/1.0.1/Cargo.toml
[INFO] started frobbing r4-1.0.1
[INFO] finished frobbing r4-1.0.1
[INFO] frobbed toml for r4-1.0.1 written to work/ex/beta-1.38-1/sources/beta-2019-08-13/reg/r4/1.0.1/Cargo.toml
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+1.37.0" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update"`
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+beta-2019-08-13" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update"`
[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 r4-1.0.1 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-2/1.37.0:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/beta-1.38-1/sources/1.37.0/reg/r4/1.0.1:/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] a81f965c02c5601231984f9c2d15381a27d3ea06352c3cb329faf7b042e2591d
[INFO] running `"docker" "start" "-a" "a81f965c02c5601231984f9c2d15381a27d3ea06352c3cb329faf7b042e2591d"`
[INFO] [stderr]    Compiling r4 v1.0.1 (/opt/crater/workdir)
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 0.11s
[INFO] running `"docker" "inspect" "a81f965c02c5601231984f9c2d15381a27d3ea06352c3cb329faf7b042e2591d"`
[INFO] running `"docker" "rm" "-f" "a81f965c02c5601231984f9c2d15381a27d3ea06352c3cb329faf7b042e2591d"`
[INFO] [stdout] a81f965c02c5601231984f9c2d15381a27d3ea06352c3cb329faf7b042e2591d
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/beta-1.38-1/worker-2/1.37.0:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/beta-1.38-1/sources/1.37.0/reg/r4/1.0.1:/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] ae74623f6d7317bfd09e992c1bc1a58bb6cc50b0e45900f30c859530b5c2e4e9
[INFO] running `"docker" "start" "-a" "ae74623f6d7317bfd09e992c1bc1a58bb6cc50b0e45900f30c859530b5c2e4e9"`
[INFO] [stderr]    Compiling r4 v1.0.1 (/opt/crater/workdir)
[INFO] [stderr] warning: unused variable: `i`
[INFO] [stderr]    --> src/lib.rs:407:34
[INFO] [stderr]     |
[INFO] [stderr] 407 |                     iterate![for i in 0..4;
[INFO] [stderr]     |                                  ^ help: consider prefixing with an underscore: `_i`
[INFO] [stderr]     |
[INFO] [stderr]     = note: #[warn(unused_variables)] on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `x`
[INFO] [stderr]    --> src/lib.rs:433:34
[INFO] [stderr]     |
[INFO] [stderr] 433 |                     iterate![for x in vs.iter();
[INFO] [stderr]     |                                  ^ help: consider prefixing with an underscore: `_x`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `x`
[INFO] [stderr]    --> src/lib.rs:443:34
[INFO] [stderr]     |
[INFO] [stderr] 443 |                     iterate![for x in vs.iter();
[INFO] [stderr]     |                                  ^ help: consider prefixing with an underscore: `_x`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `a`
[INFO] [stderr]    --> src/lib.rs:474:34
[INFO] [stderr]     |
[INFO] [stderr] 474 |                              let a = *x + 3;
[INFO] [stderr]     |                                  ^ help: consider prefixing with an underscore: `_a`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `a`
[INFO] [stderr]    --> src/lib.rs:489:34
[INFO] [stderr]     |
[INFO] [stderr] 489 |                              let a = *x + 3;
[INFO] [stderr]     |                                  ^ help: consider prefixing with an underscore: `_a`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `y`
[INFO] [stderr]    --> src/lib.rs:506:34
[INFO] [stderr]     |
[INFO] [stderr] 506 |                              for y in vs.iter();
[INFO] [stderr]     |                                  ^ help: consider prefixing with an underscore: `_y`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `x`
[INFO] [stderr]    --> src/lib.rs:522:34
[INFO] [stderr]     |
[INFO] [stderr] 522 |                              let x = *x + 1;
[INFO] [stderr]     |                                  ^ help: consider prefixing with an underscore: `_x`
[INFO] [stderr] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 0.82s
[INFO] running `"docker" "inspect" "ae74623f6d7317bfd09e992c1bc1a58bb6cc50b0e45900f30c859530b5c2e4e9"`
[INFO] running `"docker" "rm" "-f" "ae74623f6d7317bfd09e992c1bc1a58bb6cc50b0e45900f30c859530b5c2e4e9"`
[INFO] [stdout] ae74623f6d7317bfd09e992c1bc1a58bb6cc50b0e45900f30c859530b5c2e4e9
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/beta-1.38-1/worker-2/1.37.0:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/beta-1.38-1/sources/1.37.0/reg/r4/1.0.1:/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] 93f62db546f3aab7cc81838d5fe59c789286e5f1a0aa88dc0a6e1ccbd0e953a4
[INFO] running `"docker" "start" "-a" "93f62db546f3aab7cc81838d5fe59c789286e5f1a0aa88dc0a6e1ccbd0e953a4"`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 0.01s
[INFO] [stderr]      Running /opt/crater/target/debug/deps/r4-fff559390e22e730
[INFO] [stdout] 
[INFO] [stdout] running 22 tests
[INFO] [stdout] test tests::if_if_let ... ok
[INFO] [stdout] test tests::bind_pattern_in_for ... ok
[INFO] [stdout] test tests::test_basic ... ok
[INFO] [stdout] test tests::test_just_multiple_yields ... ok
[INFO] [stdout] test tests::test_if_let_let ... ok
[INFO] [stdout] test tests::test_if_let_if ... ok
[INFO] [stdout] test tests::test_multiple_yield_with_filter_1 ... ok
[INFO] [stdout] test tests::test_multiple_yield_with_filter_2 ... ok
[INFO] [stdout] test tests::test_move_succeed ... ok
[INFO] [stdout] test tests::test_basic_if ... ok
[INFO] [stdout] test tests::test_basic_if_let ... ok
[INFO] [stdout] test tests::test_if_let_filter ... ok
[INFO] [stdout] test tests::test_multiple_yields_liked_nested_loops ... ok
[INFO] [stdout] test tests::test_nested_refs ... ok
[INFO] [stdout] test tests::test_nested_refs_for_let_for_shadowing ... ok
[INFO] [stdout] test tests::test_nested_refs_outer_let ... ok
[INFO] [stdout] test tests::test_nested_refs_let_let_shadowing_2 ... ok
[INFO] [stdout] test tests::test_nested_refs_let_let_shadowing_1 ... ok
[INFO] [stdout] test tests::test_nested_refs_inner_if ... ok
[INFO] [stdout] test tests::test_nested_refs_for_let_shadowing ... ok
[INFO] [stdout] test tests::test_simple_if_let ... ok
[INFO] [stderr]    Doc-tests r4
[INFO] [stdout] test tests::test_if_let_for ... ok
[INFO] [stdout] 
[INFO] [stdout] test result: ok. 22 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] running 13 tests
[INFO] [stdout] test src/lib.rs -  (line 190) ... ignored
[INFO] [stdout] test src/lib.rs -  (line 52) ... ok
[INFO] [stdout] test src/lib.rs -  (line 175) ... ok
[INFO] [stdout] test src/lib.rs -  (line 62) ... ok
[INFO] [stdout] test src/lib.rs - FlatIter (line 227) ... ignored
[INFO] [stdout] test src/lib.rs -  (line 18) ... ok
[INFO] [stdout] test src/lib.rs -  (line 144) ... ok
[INFO] [stdout] test src/lib.rs -  (line 29) ... ok
[INFO] [stdout] test src/lib.rs -  (line 204) ... ok
[INFO] [stdout] test src/lib.rs -  (line 128) ... ok
[INFO] [stdout] test src/lib.rs - FlatIter (line 246) ... ok
[INFO] [stdout] test src/lib.rs -  (line 92) ... ok
[INFO] [stdout] test src/lib.rs -  (line 82) ... ok
[INFO] [stdout] 
[INFO] [stdout] test result: ok. 11 passed; 0 failed; 2 ignored; 0 measured; 0 filtered out
[INFO] [stdout] 
[INFO] running `"docker" "inspect" "93f62db546f3aab7cc81838d5fe59c789286e5f1a0aa88dc0a6e1ccbd0e953a4"`
[INFO] running `"docker" "rm" "-f" "93f62db546f3aab7cc81838d5fe59c789286e5f1a0aa88dc0a6e1ccbd0e953a4"`
[INFO] [stdout] 93f62db546f3aab7cc81838d5fe59c789286e5f1a0aa88dc0a6e1ccbd0e953a4