[INFO] fetching crate r4 1.0.1...
[INFO] testing r4-1.0.1 against master#a77da2d454e6caa227a85b16410b95f93495e7e0 for pr-91031
[INFO] extracting crate r4 1.0.1 into /workspace/builds/worker-51/source
[INFO] validating manifest of crates.io crate r4 1.0.1 on toolchain a77da2d454e6caa227a85b16410b95f93495e7e0
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+a77da2d454e6caa227a85b16410b95f93495e7e0" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking crates.io crate r4 1.0.1
[INFO] finished tweaking crates.io crate r4 1.0.1
[INFO] tweaked toml for crates.io crate r4 1.0.1 written to /workspace/builds/worker-51/source/Cargo.toml
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+a77da2d454e6caa227a85b16410b95f93495e7e0" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+a77da2d454e6caa227a85b16410b95f93495e7e0" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-51/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-51/source:/opt/rustwide/workdir:ro,Z" "-v" "/var/lib/crater-agent-workspace/cargo-home:/opt/rustwide/cargo-home:ro,Z" "-v" "/var/lib/crater-agent-workspace/rustup-home:/opt/rustwide/rustup-home:ro,Z" "-e" "SOURCE_DIR=/opt/rustwide/workdir" "-e" "CARGO_TARGET_DIR=/opt/rustwide/target" "-e" "CARGO_HOME=/opt/rustwide/cargo-home" "-e" "RUSTUP_HOME=/opt/rustwide/rustup-home" "-w" "/opt/rustwide/workdir" "-m" "1610612736" "--user" "0:0" "--network" "none" "ghcr.io/rust-lang/crates-build-env/linux@sha256:5736fa189c1c60b01babf4b8b698fe57b6ecc41933a7ff2e0b8d7a221459412b" "/opt/rustwide/cargo-home/bin/cargo" "+a77da2d454e6caa227a85b16410b95f93495e7e0" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 535486ccc9b61100b377b4b1fd5e23c68317773b2d607377299c85860ac704d0
[INFO] running `Command { std: "docker" "start" "-a" "535486ccc9b61100b377b4b1fd5e23c68317773b2d607377299c85860ac704d0", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "535486ccc9b61100b377b4b1fd5e23c68317773b2d607377299c85860ac704d0", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "535486ccc9b61100b377b4b1fd5e23c68317773b2d607377299c85860ac704d0", kill_on_drop: false }`
[INFO] [stdout] 535486ccc9b61100b377b4b1fd5e23c68317773b2d607377299c85860ac704d0
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-51/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-51/source:/opt/rustwide/workdir:ro,Z" "-v" "/var/lib/crater-agent-workspace/cargo-home:/opt/rustwide/cargo-home:ro,Z" "-v" "/var/lib/crater-agent-workspace/rustup-home:/opt/rustwide/rustup-home:ro,Z" "-e" "SOURCE_DIR=/opt/rustwide/workdir" "-e" "CARGO_TARGET_DIR=/opt/rustwide/target" "-e" "CARGO_INCREMENTAL=0" "-e" "RUST_BACKTRACE=full" "-e" "RUSTFLAGS=--cap-lints=forbid" "-e" "CARGO_HOME=/opt/rustwide/cargo-home" "-e" "RUSTUP_HOME=/opt/rustwide/rustup-home" "-w" "/opt/rustwide/workdir" "-m" "1610612736" "--user" "0:0" "--network" "none" "ghcr.io/rust-lang/crates-build-env/linux@sha256:5736fa189c1c60b01babf4b8b698fe57b6ecc41933a7ff2e0b8d7a221459412b" "/opt/rustwide/cargo-home/bin/cargo" "+a77da2d454e6caa227a85b16410b95f93495e7e0" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 8731cb9e35110a496de34983859f9c95f44a40ec9b1aaca4523ada0dd17a0684
[INFO] running `Command { std: "docker" "start" "-a" "8731cb9e35110a496de34983859f9c95f44a40ec9b1aaca4523ada0dd17a0684", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]    Compiling r4 v1.0.1 (/opt/rustwide/workdir)
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 1.73s
[INFO] running `Command { std: "docker" "inspect" "8731cb9e35110a496de34983859f9c95f44a40ec9b1aaca4523ada0dd17a0684", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "8731cb9e35110a496de34983859f9c95f44a40ec9b1aaca4523ada0dd17a0684", kill_on_drop: false }`
[INFO] [stdout] 8731cb9e35110a496de34983859f9c95f44a40ec9b1aaca4523ada0dd17a0684
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-51/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-51/source:/opt/rustwide/workdir:ro,Z" "-v" "/var/lib/crater-agent-workspace/cargo-home:/opt/rustwide/cargo-home:ro,Z" "-v" "/var/lib/crater-agent-workspace/rustup-home:/opt/rustwide/rustup-home:ro,Z" "-e" "SOURCE_DIR=/opt/rustwide/workdir" "-e" "CARGO_TARGET_DIR=/opt/rustwide/target" "-e" "CARGO_INCREMENTAL=0" "-e" "RUST_BACKTRACE=full" "-e" "RUSTFLAGS=--cap-lints=forbid" "-e" "CARGO_HOME=/opt/rustwide/cargo-home" "-e" "RUSTUP_HOME=/opt/rustwide/rustup-home" "-w" "/opt/rustwide/workdir" "-m" "1610612736" "--user" "0:0" "--network" "none" "ghcr.io/rust-lang/crates-build-env/linux@sha256:5736fa189c1c60b01babf4b8b698fe57b6ecc41933a7ff2e0b8d7a221459412b" "/opt/rustwide/cargo-home/bin/cargo" "+a77da2d454e6caa227a85b16410b95f93495e7e0" "test" "--frozen" "--no-run" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 18fa6cdf3a270db045c7a9ccc9565d2fcf004cd56f528d9b886644f69bd6fbb9
[INFO] running `Command { std: "docker" "start" "-a" "18fa6cdf3a270db045c7a9ccc9565d2fcf004cd56f528d9b886644f69bd6fbb9", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]    Compiling r4 v1.0.1 (/opt/rustwide/workdir)
[INFO] [stdout] warning: unnecessary trailing semicolon
[INFO] [stdout]    --> src/lib.rs:632:10
[INFO] [stdout]     |
[INFO] [stdout] 632 |         };
[INFO] [stdout]     |          ^ help: remove this semicolon
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(redundant_semicolons)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `i`
[INFO] [stdout]    --> src/lib.rs:407:34
[INFO] [stdout]     |
[INFO] [stdout] 407 |                     iterate![for i in 0..4;
[INFO] [stdout]     |                                  ^ help: if this is intentional, prefix it with an underscore: `_i`
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `x`
[INFO] [stdout]    --> src/lib.rs:433:34
[INFO] [stdout]     |
[INFO] [stdout] 433 |                     iterate![for x in vs.iter();
[INFO] [stdout]     |                                  ^ help: if this is intentional, prefix it with an underscore: `_x`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `x`
[INFO] [stdout]    --> src/lib.rs:443:34
[INFO] [stdout]     |
[INFO] [stdout] 443 |                     iterate![for x in vs.iter();
[INFO] [stdout]     |                                  ^ help: if this is intentional, prefix it with an underscore: `_x`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `a`
[INFO] [stdout]    --> src/lib.rs:474:34
[INFO] [stdout]     |
[INFO] [stdout] 474 | ...                   let a = *x + 3;
[INFO] [stdout]     |                           ^ help: if this is intentional, prefix it with an underscore: `_a`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `a`
[INFO] [stdout]    --> src/lib.rs:489:34
[INFO] [stdout]     |
[INFO] [stdout] 489 | ...                   let a = *x + 3;
[INFO] [stdout]     |                           ^ help: if this is intentional, prefix it with an underscore: `_a`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `y`
[INFO] [stdout]    --> src/lib.rs:506:34
[INFO] [stdout]     |
[INFO] [stdout] 506 | ...                   for y in vs.iter();
[INFO] [stdout]     |                           ^ help: if this is intentional, prefix it with an underscore: `_y`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `x`
[INFO] [stdout]    --> src/lib.rs:522:34
[INFO] [stdout]     |
[INFO] [stdout] 522 | ...                   let x = *x + 1;
[INFO] [stdout]     |                           ^ help: if this is intentional, prefix it with an underscore: `_x`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 8 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished test [unoptimized + debuginfo] target(s) in 1.76s
[INFO] running `Command { std: "docker" "inspect" "18fa6cdf3a270db045c7a9ccc9565d2fcf004cd56f528d9b886644f69bd6fbb9", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "18fa6cdf3a270db045c7a9ccc9565d2fcf004cd56f528d9b886644f69bd6fbb9", kill_on_drop: false }`
[INFO] [stdout] 18fa6cdf3a270db045c7a9ccc9565d2fcf004cd56f528d9b886644f69bd6fbb9
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-51/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-51/source:/opt/rustwide/workdir:ro,Z" "-v" "/var/lib/crater-agent-workspace/cargo-home:/opt/rustwide/cargo-home:ro,Z" "-v" "/var/lib/crater-agent-workspace/rustup-home:/opt/rustwide/rustup-home:ro,Z" "-e" "SOURCE_DIR=/opt/rustwide/workdir" "-e" "CARGO_TARGET_DIR=/opt/rustwide/target" "-e" "CARGO_INCREMENTAL=0" "-e" "RUST_BACKTRACE=full" "-e" "RUSTFLAGS=--cap-lints=forbid" "-e" "CARGO_HOME=/opt/rustwide/cargo-home" "-e" "RUSTUP_HOME=/opt/rustwide/rustup-home" "-w" "/opt/rustwide/workdir" "-m" "1610612736" "--user" "0:0" "--network" "none" "ghcr.io/rust-lang/crates-build-env/linux@sha256:5736fa189c1c60b01babf4b8b698fe57b6ecc41933a7ff2e0b8d7a221459412b" "/opt/rustwide/cargo-home/bin/cargo" "+a77da2d454e6caa227a85b16410b95f93495e7e0" "test" "--frozen", kill_on_drop: false }`
[INFO] [stdout] fb86e58cb475fae24423079a89421274a876522e11a3e95bcd22c87df7bfce94
[INFO] running `Command { std: "docker" "start" "-a" "fb86e58cb475fae24423079a89421274a876522e11a3e95bcd22c87df7bfce94", kill_on_drop: false }`
[INFO] [stderr] warning: unnecessary trailing semicolon
[INFO] [stderr]    --> src/lib.rs:632:10
[INFO] [stderr]     |
[INFO] [stderr] 632 |         };
[INFO] [stderr]     |          ^ help: remove this semicolon
[INFO] [stderr]     |
[INFO] [stderr]     = note: `#[warn(redundant_semicolons)]` on by default
[INFO] [stderr] 
[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: if this is intentional, prefix it 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: if this is intentional, prefix it 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: if this is intentional, prefix it 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: if this is intentional, prefix it 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: if this is intentional, prefix it 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: if this is intentional, prefix it 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: if this is intentional, prefix it with an underscore: `_x`
[INFO] [stderr] 
[INFO] [stderr] warning: `r4` (lib test) generated 8 warnings
[INFO] [stderr]     Finished test [unoptimized + debuginfo] target(s) in 0.02s
[INFO] [stderr]      Running unittests (/opt/rustwide/target/debug/deps/r4-44a4b962b4d915f0)
[INFO] [stdout] 
[INFO] [stdout] running 22 tests
[INFO] [stdout] test tests::bind_pattern_in_for ... ok
[INFO] [stdout] test tests::test_basic ... ok
[INFO] [stdout] test tests::if_if_let ... ok
[INFO] [stdout] test tests::test_basic_if ... ok
[INFO] [stdout] test tests::test_if_let_for ... ok
[INFO] [stdout] test tests::test_nested_refs_for_let_shadowing ... ok
[INFO] [stdout] test tests::test_nested_refs_let_let_shadowing_2 ... ok
[INFO] [stdout] test tests::test_nested_refs_for_let_for_shadowing ... ok
[INFO] [stdout] test tests::test_basic_if_let ... ok
[INFO] [stdout] test tests::test_nested_refs_inner_if ... ok
[INFO] [stdout] test tests::test_multiple_yields_liked_nested_loops ... ok
[INFO] [stdout] test tests::test_if_let_let ... 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_multiple_yield_with_filter_1 ... ok
[INFO] [stdout] test tests::test_if_let_if ... ok
[INFO] [stdout] test tests::test_just_multiple_yields ... ok
[INFO] [stdout] test tests::test_nested_refs ... ok
[INFO] [stdout] test tests::test_nested_refs_outer_let ... ok
[INFO] [stdout] test tests::test_if_let_filter ... ok
[INFO] [stdout] test tests::test_nested_refs_let_let_shadowing_1 ... ok
[INFO] [stdout] test tests::test_simple_if_let ... ok
[INFO] [stdout] 
[INFO] [stdout] test result: ok. 22 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 0.05s
[INFO] [stdout] 
[INFO] [stderr]    Doc-tests r4
[INFO] [stdout] 
[INFO] [stdout] running 13 tests
[INFO] [stdout] test src/lib.rs - (line 190) ... ignored
[INFO] [stdout] test src/lib.rs - FlatIter (line 227) ... ignored
[INFO] [stdout] test src/lib.rs - FlatIter (line 246) ... ok
[INFO] [stdout] test src/lib.rs - (line 175) ... ok
[INFO] [stdout] test src/lib.rs - (line 29) ... ok
[INFO] [stdout] test src/lib.rs - (line 18) ... ok
[INFO] [stdout] test src/lib.rs - (line 128) ... ok
[INFO] [stdout] test src/lib.rs - (line 204) ... ok
[INFO] [stdout] test src/lib.rs - (line 82) ... ok
[INFO] [stdout] test src/lib.rs - (line 144) ... ok
[INFO] [stdout] test src/lib.rs - (line 92) ... ok
[INFO] [stdout] test src/lib.rs - (line 52) ... ok
[INFO] [stdout] test src/lib.rs - (line 62) ... ok
[INFO] [stdout] 
[INFO] [stdout] test result: ok. 11 passed; 0 failed; 2 ignored; 0 measured; 0 filtered out; finished in 1.25s
[INFO] [stdout] 
[INFO] running `Command { std: "docker" "inspect" "fb86e58cb475fae24423079a89421274a876522e11a3e95bcd22c87df7bfce94", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "fb86e58cb475fae24423079a89421274a876522e11a3e95bcd22c87df7bfce94", kill_on_drop: false }`
[INFO] [stdout] fb86e58cb475fae24423079a89421274a876522e11a3e95bcd22c87df7bfce94