[INFO] fetching crate middleman 0.3.1...
[INFO] extracting crate middleman 0.3.1 into work/ex/pr-61629/sources/master#c8865d8e195813ade6b84434ac9f8850e7112d1a/reg/middleman/0.3.1
[INFO] extracting crate middleman 0.3.1 into work/ex/pr-61629/sources/try#e212b7d492c96d3837691ba29d32d5f468933fb8/reg/middleman/0.3.1
[INFO] validating manifest of middleman-0.3.1 on toolchain master#c8865d8e195813ade6b84434ac9f8850e7112d1a
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+c8865d8e195813ade6b84434ac9f8850e7112d1a-alt" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] validating manifest of middleman-0.3.1 on toolchain try#e212b7d492c96d3837691ba29d32d5f468933fb8
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+e212b7d492c96d3837691ba29d32d5f468933fb8-alt" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] started frobbing middleman-0.3.1
[INFO] finished frobbing middleman-0.3.1
[INFO] frobbed toml for middleman-0.3.1 written to work/ex/pr-61629/sources/master#c8865d8e195813ade6b84434ac9f8850e7112d1a/reg/middleman/0.3.1/Cargo.toml
[INFO] started frobbing middleman-0.3.1
[INFO] finished frobbing middleman-0.3.1
[INFO] frobbed toml for middleman-0.3.1 written to work/ex/pr-61629/sources/try#e212b7d492c96d3837691ba29d32d5f468933fb8/reg/middleman/0.3.1/Cargo.toml
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+c8865d8e195813ade6b84434ac9f8850e7112d1a-alt" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update"`
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+e212b7d492c96d3837691ba29d32d5f468933fb8-alt" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update"`
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+c8865d8e195813ade6b84434ac9f8850e7112d1a-alt" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+e212b7d492c96d3837691ba29d32d5f468933fb8-alt" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] building middleman-0.3.1 against master#c8865d8e195813ade6b84434ac9f8850e7112d1a for pr-61629
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/pr-61629/worker-4/master#c8865d8e195813ade6b84434ac9f8850e7112d1a:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/pr-61629/sources/master#c8865d8e195813ade6b84434ac9f8850e7112d1a/reg/middleman/0.3.1:/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=forbid" "-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" "+c8865d8e195813ade6b84434ac9f8850e7112d1a-alt" "build" "--frozen"`
[INFO] [stdout] 91add09eeb8ae0c45a9cbffa698145f680d754486e122d0cc495fae82da9d7c6
[INFO] running `"docker" "start" "-a" "91add09eeb8ae0c45a9cbffa698145f680d754486e122d0cc495fae82da9d7c6"`
[INFO] [stderr]    Compiling middleman v0.3.1 (/opt/crater/workdir)
[INFO] [stderr] warning: variable does not need to be mutable
[INFO] [stderr]    --> src/structs.rs:313:18
[INFO] [stderr]     |
[INFO] [stderr] 313 |                 let mut vec = self.buf.drain(0..buf_end)
[INFO] [stderr]     |                     ----^^^
[INFO] [stderr]     |                     |
[INFO] [stderr]     |                     help: remove this `mut`
[INFO] [stderr]     |
[INFO] [stderr]     = note: #[warn(unused_mut)] on by default
[INFO] [stderr] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 0.95s
[INFO] running `"docker" "inspect" "91add09eeb8ae0c45a9cbffa698145f680d754486e122d0cc495fae82da9d7c6"`
[INFO] running `"docker" "rm" "-f" "91add09eeb8ae0c45a9cbffa698145f680d754486e122d0cc495fae82da9d7c6"`
[INFO] [stdout] 91add09eeb8ae0c45a9cbffa698145f680d754486e122d0cc495fae82da9d7c6
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/pr-61629/worker-4/master#c8865d8e195813ade6b84434ac9f8850e7112d1a:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/pr-61629/sources/master#c8865d8e195813ade6b84434ac9f8850e7112d1a/reg/middleman/0.3.1:/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=forbid" "-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" "+c8865d8e195813ade6b84434ac9f8850e7112d1a-alt" "test" "--frozen" "--no-run"`
[INFO] [stdout] 232b0a80dc893e8a9f8ad44bdecb6a7412168a399845c3c421a0cf4f2d2c8278
[INFO] running `"docker" "start" "-a" "232b0a80dc893e8a9f8ad44bdecb6a7412168a399845c3c421a0cf4f2d2c8278"`
[INFO] [stderr]    Compiling middleman v0.3.1 (/opt/crater/workdir)
[INFO] [stderr] warning: variable does not need to be mutable
[INFO] [stderr]    --> src/structs.rs:313:18
[INFO] [stderr]     |
[INFO] [stderr] 313 |                 let mut vec = self.buf.drain(0..buf_end)
[INFO] [stderr]     |                     ----^^^
[INFO] [stderr]     |                     |
[INFO] [stderr]     |                     help: remove this `mut`
[INFO] [stderr]     |
[INFO] [stderr]     = note: #[warn(unused_mut)] on by default
[INFO] [stderr] 
[INFO] [stderr] warning: variable does not need to be mutable
[INFO] [stderr]    --> src/tests.rs:532:41
[INFO] [stderr]     |
[INFO] [stderr] 532 |                                     let mut stream = streams.get_mut(&token).unwrap();
[INFO] [stderr]     |                                         ----^^^^^^
[INFO] [stderr]     |                                         |
[INFO] [stderr]     |                                         help: remove this `mut`
[INFO] [stderr] 
[INFO] [stderr] warning: unused `std::result::Result` in tuple element 1 that must be used
[INFO] [stderr]    --> src/tests.rs:226:28
[INFO] [stderr]     |
[INFO] [stderr] 226 |                 TOK_A => { a.recv_all_map(&mut work); },
[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] warning: unused `std::result::Result` in tuple element 1 that must be used
[INFO] [stderr]    --> src/tests.rs:227:28
[INFO] [stderr]     |
[INFO] [stderr] 227 |                 TOK_B => { b.recv_all_map(&mut work); },
[INFO] [stderr]     |                            ^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]     |
[INFO] [stderr]     = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stderr] 
[INFO] [stderr] warning: unused `std::result::Result` in tuple element 1 that must be used
[INFO] [stderr]    --> src/tests.rs:344:13
[INFO] [stderr]     |
[INFO] [stderr] 344 | /             a.recv_all_map::<_, Complex>(|_mm, msg| {
[INFO] [stderr] 345 | |                 assert_eq!(&msg, &struct_form);
[INFO] [stderr] 346 | |                 to_go -= 1;
[INFO] [stderr] 347 | |             });
[INFO] [stderr]     | |_______________^
[INFO] [stderr]     |
[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 2.94s
[INFO] running `"docker" "inspect" "232b0a80dc893e8a9f8ad44bdecb6a7412168a399845c3c421a0cf4f2d2c8278"`
[INFO] running `"docker" "rm" "-f" "232b0a80dc893e8a9f8ad44bdecb6a7412168a399845c3c421a0cf4f2d2c8278"`
[INFO] [stdout] 232b0a80dc893e8a9f8ad44bdecb6a7412168a399845c3c421a0cf4f2d2c8278