[INFO] fetching crate mastring 0.2.0...
[INFO] checking mastring-0.2.0 against try#54cf65b8d066c082e536455049b95943cf30378f for pr-151920
[INFO] extracting crate mastring 0.2.0 into /workspace/builds/worker-7-tc2/source
[INFO] started tweaking crates.io crate mastring 0.2.0
[INFO] removed 0 missing examples
[INFO] removed 0 missing tests
[INFO] finished tweaking crates.io crate mastring 0.2.0
[INFO] tweaked toml for crates.io crate mastring 0.2.0 written to /workspace/builds/worker-7-tc2/source/Cargo.toml
[INFO] validating manifest of crates.io crate mastring 0.2.0 on toolchain 54cf65b8d066c082e536455049b95943cf30378f
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+54cf65b8d066c082e536455049b95943cf30378f" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] crate crates.io crate mastring 0.2.0 already has a lockfile, it will not be regenerated
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+54cf65b8d066c082e536455049b95943cf30378f" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-7-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-7-tc2/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@sha256:61361fe0aef631f17e9d025a70c5a647956f8c671dd02950a60ad3f5cc5526d7" "/opt/rustwide/cargo-home/bin/cargo" "+54cf65b8d066c082e536455049b95943cf30378f" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] a8daf4264f49278778332a8cf15056d4763c23d27b8f3c45b52fae02c49d3808
[INFO] running `Command { std: "docker" "start" "-a" "a8daf4264f49278778332a8cf15056d4763c23d27b8f3c45b52fae02c49d3808", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "a8daf4264f49278778332a8cf15056d4763c23d27b8f3c45b52fae02c49d3808", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "a8daf4264f49278778332a8cf15056d4763c23d27b8f3c45b52fae02c49d3808", kill_on_drop: false }`
[INFO] [stdout] a8daf4264f49278778332a8cf15056d4763c23d27b8f3c45b52fae02c49d3808
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-7-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-7-tc2/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" "RUSTDOCFLAGS=--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@sha256:61361fe0aef631f17e9d025a70c5a647956f8c671dd02950a60ad3f5cc5526d7" "/opt/rustwide/cargo-home/bin/cargo" "+54cf65b8d066c082e536455049b95943cf30378f" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] f117ab8c496bfe1a6c4c390ef3420315cbc4326a269ad659012fcc4451969988
[INFO] running `Command { std: "docker" "start" "-a" "f117ab8c496bfe1a6c4c390ef3420315cbc4326a269ad659012fcc4451969988", kill_on_drop: false }`
[INFO] [stderr]     Checking mastring v0.2.0 (/opt/rustwide/workdir)
[INFO] [stdout] error: not automatically applying `DerefMut` through union field to target that might have `Drop` glue
[INFO] [stdout]    --> src/lib.rs:467:21
[INFO] [stdout]     |
[INFO] [stdout] 467 |                     self.long.len = 0;
[INFO] [stdout]     |                     ^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = help: writing to this reference calls the destructor for the old value
[INFO] [stdout]     = help: add an explicit `*` if that is desired, or call `ptr::write` to not run the destructor
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: not automatically applying `DerefMut` through union field to target that might have `Drop` glue
[INFO] [stdout]    --> src/lib.rs:472:25
[INFO] [stdout]     |
[INFO] [stdout] 472 |                         self.long.len = 0;
[INFO] [stdout]     |                         ^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = help: writing to this reference calls the destructor for the old value
[INFO] [stdout]     = help: add an explicit `*` if that is desired, or call `ptr::write` to not run the destructor
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: not automatically applying `DerefMut` through union field to target that might have `Drop` glue
[INFO] [stdout]    --> src/lib.rs:593:17
[INFO] [stdout]     |
[INFO] [stdout] 593 |                 self.long.len = len;
[INFO] [stdout]     |                 ^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = help: writing to this reference calls the destructor for the old value
[INFO] [stdout]     = help: add an explicit `*` if that is desired, or call `ptr::write` to not run the destructor
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: not automatically applying `DerefMut` through union field to target that might have `Drop` glue
[INFO] [stdout]    --> src/lib.rs:840:17
[INFO] [stdout]     |
[INFO] [stdout] 840 |                 self.long.len = 0;
[INFO] [stdout]     |                 ^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = help: writing to this reference calls the destructor for the old value
[INFO] [stdout]     = help: add an explicit `*` if that is desired, or call `ptr::write` to not run the destructor
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: not automatically applying `DerefMut` through union field to target that might have `Drop` glue
[INFO] [stdout]    --> src/lib.rs:932:17
[INFO] [stdout]     |
[INFO] [stdout] 932 |                 self.long.len = len;
[INFO] [stdout]     |                 ^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = help: writing to this reference calls the destructor for the old value
[INFO] [stdout]     = help: add an explicit `*` if that is desired, or call `ptr::write` to not run the destructor
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: not automatically applying `DerefMut` through union field to target that might have `Drop` glue
[INFO] [stdout]    --> src/lib.rs:467:21
[INFO] [stdout]     |
[INFO] [stdout] 467 |                     self.long.len = 0;
[INFO] [stdout]     |                     ^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = help: writing to this reference calls the destructor for the old value
[INFO] [stdout]     = help: add an explicit `*` if that is desired, or call `ptr::write` to not run the destructor
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: not automatically applying `DerefMut` through union field to target that might have `Drop` glue
[INFO] [stdout]    --> src/lib.rs:472:25
[INFO] [stdout]     |
[INFO] [stdout] 472 |                         self.long.len = 0;
[INFO] [stdout]     |                         ^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = help: writing to this reference calls the destructor for the old value
[INFO] [stdout]     = help: add an explicit `*` if that is desired, or call `ptr::write` to not run the destructor
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: not automatically applying `DerefMut` through union field to target that might have `Drop` glue
[INFO] [stdout]    --> src/lib.rs:593:17
[INFO] [stdout]     |
[INFO] [stdout] 593 |                 self.long.len = len;
[INFO] [stdout]     |                 ^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = help: writing to this reference calls the destructor for the old value
[INFO] [stdout]     = help: add an explicit `*` if that is desired, or call `ptr::write` to not run the destructor
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: not automatically applying `DerefMut` through union field to target that might have `Drop` glue
[INFO] [stdout]    --> src/lib.rs:840:17
[INFO] [stdout]     |
[INFO] [stdout] 840 |                 self.long.len = 0;
[INFO] [stdout]     |                 ^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = help: writing to this reference calls the destructor for the old value
[INFO] [stdout]     = help: add an explicit `*` if that is desired, or call `ptr::write` to not run the destructor
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: not automatically applying `DerefMut` through union field to target that might have `Drop` glue
[INFO] [stdout]    --> src/lib.rs:932:17
[INFO] [stdout]     |
[INFO] [stdout] 932 |                 self.long.len = len;
[INFO] [stdout]     |                 ^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = help: writing to this reference calls the destructor for the old value
[INFO] [stdout]     = help: add an explicit `*` if that is desired, or call `ptr::write` to not run the destructor
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `mastring` (lib) due to 5 previous errors
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[INFO] [stderr] error: could not compile `mastring` (lib test) due to 5 previous errors
[INFO] running `Command { std: "docker" "inspect" "f117ab8c496bfe1a6c4c390ef3420315cbc4326a269ad659012fcc4451969988", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "f117ab8c496bfe1a6c4c390ef3420315cbc4326a269ad659012fcc4451969988", kill_on_drop: false }`
[INFO] [stdout] f117ab8c496bfe1a6c4c390ef3420315cbc4326a269ad659012fcc4451969988
