[INFO] fetching crate instance-copy-on-write 0.9.1...
[INFO] checking instance-copy-on-write-0.9.1 against try#7b3da9103634dffd4f4365cfd8642427c781d99f+rustflags=-Dinherent-method-on-receiver for 152214-denied
[INFO] extracting crate instance-copy-on-write 0.9.1 into /workspace/builds/worker-2-tc2/source
[INFO] started tweaking crates.io crate instance-copy-on-write 0.9.1
[INFO] finished tweaking crates.io crate instance-copy-on-write 0.9.1
[INFO] tweaked toml for crates.io crate instance-copy-on-write 0.9.1 written to /workspace/builds/worker-2-tc2/source/Cargo.toml
[INFO] validating manifest of crates.io crate instance-copy-on-write 0.9.1 on toolchain 7b3da9103634dffd4f4365cfd8642427c781d99f
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+7b3da9103634dffd4f4365cfd8642427c781d99f" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] crate crates.io crate instance-copy-on-write 0.9.1 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" "+7b3da9103634dffd4f4365cfd8642427c781d99f" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-2-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-2-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" "+7b3da9103634dffd4f4365cfd8642427c781d99f" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 1a060603355fb333988c196337fabdb6a7ae823d07b069c143a83e3a43fdc9d9
[INFO] running `Command { std: "docker" "start" "-a" "1a060603355fb333988c196337fabdb6a7ae823d07b069c143a83e3a43fdc9d9", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "1a060603355fb333988c196337fabdb6a7ae823d07b069c143a83e3a43fdc9d9", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "1a060603355fb333988c196337fabdb6a7ae823d07b069c143a83e3a43fdc9d9", kill_on_drop: false }`
[INFO] [stdout] 1a060603355fb333988c196337fabdb6a7ae823d07b069c143a83e3a43fdc9d9
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-2-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-2-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 -Dinherent-method-on-receiver" "-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" "+7b3da9103634dffd4f4365cfd8642427c781d99f" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 99a3b09289a0430780f7d873351b5ff08a6b6cb2347942ba30c719195e8bca9c
[INFO] running `Command { std: "docker" "start" "-a" "99a3b09289a0430780f7d873351b5ff08a6b6cb2347942ba30c719195e8bca9c", kill_on_drop: false }`
[INFO] [stderr]     Checking crossbeam-epoch v0.9.18
[INFO] [stderr]     Checking crossbeam-deque v0.8.6
[INFO] [stderr]     Checking instance-copy-on-write v0.9.1 (/opt/rustwide/workdir)
[INFO] [stdout] warning: unnecessary trailing semicolon
[INFO] [stdout]    --> src/lib.rs:189:34
[INFO] [stdout]     |
[INFO] [stdout] 189 |         struct Test { s: String };
[INFO] [stdout]     |                                  ^ help: remove this semicolon
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(redundant_semicolons)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `instance-copy-on-write` (lib) due to 21 previous errors
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[INFO] [stdout] error: inherent methods on types that implement `Deref` or `Receiver` shadow methods of their target
[INFO] [stdout]   --> src/cow_mutex.rs:53:21
[INFO] [stdout]    |
[INFO] [stdout] 38 | impl<'weak, ITEM: Sized> Deref for ICoWWeakRead<'weak, ITEM>
[INFO] [stdout]    | ------------------------------------------------------------ trait implemented here
[INFO] [stdout] 39 | {
[INFO] [stdout] 40 |     type Target = ITEM;
[INFO] [stdout]    |     ----------- with `Target` set here
[INFO] [stdout] ...
[INFO] [stdout] 53 |     fn item_updated(&self) -> bool
[INFO] [stdout]    |                     ^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: requested on the command line with `-D inherent-method-on-receiver`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: inherent methods on types that implement `Deref` or `Receiver` shadow methods of their target
[INFO] [stdout]    --> src/cow_mutex.rs:133:30
[INFO] [stdout]     |
[INFO] [stdout] 119 | impl<'read, ITEM: Sized> Deref for ICoWRead<'read, ITEM>
[INFO] [stdout]     | -------------------------------------------------------- trait implemented here
[INFO] [stdout] 120 | {
[INFO] [stdout] 121 |     type Target = ITEM;
[INFO] [stdout]     |     ----------- with `Target` set here
[INFO] [stdout] ...
[INFO] [stdout] 133 |     fn clone_copy_into_inner(self) -> ITEM
[INFO] [stdout]     |                              ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: inherent methods on types that implement `Deref` or `Receiver` shadow methods of their target
[INFO] [stdout]    --> src/cow_mutex.rs:143:24
[INFO] [stdout]     |
[INFO] [stdout] 119 | impl<'read, ITEM: Sized> Deref for ICoWRead<'read, ITEM>
[INFO] [stdout]     | -------------------------------------------------------- trait implemented here
[INFO] [stdout] 120 | {
[INFO] [stdout] 121 |     type Target = ITEM;
[INFO] [stdout]     |     ----------- with `Target` set here
[INFO] [stdout] ...
[INFO] [stdout] 143 |     fn copy_into_inner(self) -> ITEM
[INFO] [stdout]     |                        ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: inherent methods on types that implement `Deref` or `Receiver` shadow methods of their target
[INFO] [stdout]    --> src/cow_mutex.rs:153:13
[INFO] [stdout]     |
[INFO] [stdout] 119 | impl<'read, ITEM: Sized> Deref for ICoWRead<'read, ITEM>
[INFO] [stdout]     | -------------------------------------------------------- trait implemented here
[INFO] [stdout] 120 | {
[INFO] [stdout] 121 |     type Target = ITEM;
[INFO] [stdout]     |     ----------- with `Target` set here
[INFO] [stdout] ...
[INFO] [stdout] 153 |     fn weak(&self) -> Weak<ITEM>
[INFO] [stdout]     |             ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: inherent methods on types that implement `Deref` or `Receiver` shadow methods of their target
[INFO] [stdout]    --> src/cow_mutex.rs:164:21
[INFO] [stdout]     |
[INFO] [stdout] 119 | impl<'read, ITEM: Sized> Deref for ICoWRead<'read, ITEM>
[INFO] [stdout]     | -------------------------------------------------------- trait implemented here
[INFO] [stdout] 120 | {
[INFO] [stdout] 121 |     type Target = ITEM;
[INFO] [stdout]     |     ----------- with `Target` set here
[INFO] [stdout] ...
[INFO] [stdout] 164 |     fn upgrade_copy(self) -> ICoWCopy<'read, ITEM> 
[INFO] [stdout]     |                     ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: inherent methods on types that implement `Deref` or `Receiver` shadow methods of their target
[INFO] [stdout]    --> src/cow_mutex.rs:184:27
[INFO] [stdout]     |
[INFO] [stdout] 119 | impl<'read, ITEM: Sized> Deref for ICoWRead<'read, ITEM>
[INFO] [stdout]     | -------------------------------------------------------- trait implemented here
[INFO] [stdout] 120 | {
[INFO] [stdout] 121 |     type Target = ITEM;
[INFO] [stdout]     |     ----------- with `Target` set here
[INFO] [stdout] ...
[INFO] [stdout] 184 |     fn upgrade_clone_copy(self) -> ICoWCopy<'read, ITEM> 
[INFO] [stdout]     |                           ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: inherent methods on types that implement `Deref` or `Receiver` shadow methods of their target
[INFO] [stdout]    --> src/cow_mutex.rs:204:24
[INFO] [stdout]     |
[INFO] [stdout] 119 | impl<'read, ITEM: Sized> Deref for ICoWRead<'read, ITEM>
[INFO] [stdout]     | -------------------------------------------------------- trait implemented here
[INFO] [stdout] 120 | {
[INFO] [stdout] 121 |     type Target = ITEM;
[INFO] [stdout]     |     ----------- with `Target` set here
[INFO] [stdout] ...
[INFO] [stdout] 204 |     fn upgrade_default(self) -> ICoWCopy<'read, ITEM> 
[INFO] [stdout]     |                        ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: inherent methods on types that implement `Deref` or `Receiver` shadow methods of their target
[INFO] [stdout]    --> src/cow_mutex.rs:261:17
[INFO] [stdout]     |
[INFO] [stdout] 238 | impl<'copy, ITEM: Sized> Deref for ICoWCopy<'copy, ITEM>
[INFO] [stdout]     | -------------------------------------------------------- trait implemented here
[INFO] [stdout] 239 | {
[INFO] [stdout] 240 |     type Target = ITEM;
[INFO] [stdout]     |     ----------- with `Target` set here
[INFO] [stdout] ...
[INFO] [stdout] 261 |     fn prev_val(&self) -> &ITEM
[INFO] [stdout]     |                 ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: inherent methods on types that implement `Deref` or `Receiver` shadow methods of their target
[INFO] [stdout]    --> src/cow_mutex.rs:288:15
[INFO] [stdout]     |
[INFO] [stdout] 238 | impl<'copy, ITEM: Sized> Deref for ICoWCopy<'copy, ITEM>
[INFO] [stdout]     | -------------------------------------------------------- trait implemented here
[INFO] [stdout] 239 | {
[INFO] [stdout] 240 |     type Target = ITEM;
[INFO] [stdout]     |     ----------- with `Target` set here
[INFO] [stdout] ...
[INFO] [stdout] 288 |     fn commit(self) -> Result<(), (ICoWError, Self)>
[INFO] [stdout]     |               ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: inherent methods on types that implement `Deref` or `Receiver` shadow methods of their target
[INFO] [stdout]    --> src/cow_mutex.rs:340:24
[INFO] [stdout]     |
[INFO] [stdout] 238 | impl<'copy, ITEM: Sized> Deref for ICoWCopy<'copy, ITEM>
[INFO] [stdout]     | -------------------------------------------------------- trait implemented here
[INFO] [stdout] 239 | {
[INFO] [stdout] 240 |     type Target = ITEM;
[INFO] [stdout]     |     ----------- with `Target` set here
[INFO] [stdout] ...
[INFO] [stdout] 340 |     fn commit_blocking(self, ignore_excl: bool) -> Result<(), Self>
[INFO] [stdout]     |                        ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: inherent methods on types that implement `Deref` or `Receiver` shadow methods of their target
[INFO] [stdout]    --> src/cow_mutex.rs:364:19
[INFO] [stdout]     |
[INFO] [stdout] 238 | impl<'copy, ITEM: Sized> Deref for ICoWCopy<'copy, ITEM>
[INFO] [stdout]     | -------------------------------------------------------- trait implemented here
[INFO] [stdout] 239 | {
[INFO] [stdout] 240 |     type Target = ITEM;
[INFO] [stdout]     |     ----------- with `Target` set here
[INFO] [stdout] ...
[INFO] [stdout] 364 |     fn into_inner(self) -> ITEM
[INFO] [stdout]     |                   ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: inherent methods on types that implement `Deref` or `Receiver` shadow methods of their target
[INFO] [stdout]    --> src/cow_mutex.rs:410:17
[INFO] [stdout]     |
[INFO] [stdout] 410 |     fn prev_val(&self) -> &ITEM
[INFO] [stdout]     |                 ^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 434 | impl<'lock, ITEM: Sized> Deref for ICoWLock<'lock, ITEM>
[INFO] [stdout]     | -------------------------------------------------------- trait implemented here
[INFO] [stdout] 435 | {
[INFO] [stdout] 436 |     type Target = ITEM;
[INFO] [stdout]     |     ----------- with `Target` set here
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: inherent methods on types that implement `Deref` or `Receiver` shadow methods of their target
[INFO] [stdout]    --> src/cow_mutex.rs:424:15
[INFO] [stdout]     |
[INFO] [stdout] 424 |     fn commit(mut self)
[INFO] [stdout]     |               ^^^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 434 | impl<'lock, ITEM: Sized> Deref for ICoWLock<'lock, ITEM>
[INFO] [stdout]     | -------------------------------------------------------- trait implemented here
[INFO] [stdout] 435 | {
[INFO] [stdout] 436 |     type Target = ITEM;
[INFO] [stdout]     |     ----------- with `Target` set here
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: inherent methods on types that implement `Deref` or `Receiver` shadow methods of their target
[INFO] [stdout]   --> src/cow_refcell.rs:50:19
[INFO] [stdout]    |
[INFO] [stdout] 36 | impl<'read, ITEM: Sized> Deref for ICoWRead<'read, ITEM>
[INFO] [stdout]    | -------------------------------------------------------- trait implemented here
[INFO] [stdout] 37 | {
[INFO] [stdout] 38 |     type Target = ITEM;
[INFO] [stdout]    |     ----------- with `Target` set here
[INFO] [stdout] ...
[INFO] [stdout] 50 |     fn into_inner(self) -> Rc<ITEM>
[INFO] [stdout]    |                   ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: inherent methods on types that implement `Deref` or `Receiver` shadow methods of their target
[INFO] [stdout]   --> src/cow_refcell.rs:57:13
[INFO] [stdout]    |
[INFO] [stdout] 36 | impl<'read, ITEM: Sized> Deref for ICoWRead<'read, ITEM>
[INFO] [stdout]    | -------------------------------------------------------- trait implemented here
[INFO] [stdout] 37 | {
[INFO] [stdout] 38 |     type Target = ITEM;
[INFO] [stdout]    |     ----------- with `Target` set here
[INFO] [stdout] ...
[INFO] [stdout] 57 |     fn weak(&self) -> Weak<ITEM>
[INFO] [stdout]    |             ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: inherent methods on types that implement `Deref` or `Receiver` shadow methods of their target
[INFO] [stdout]   --> src/cow_refcell.rs:68:21
[INFO] [stdout]    |
[INFO] [stdout] 36 | impl<'read, ITEM: Sized> Deref for ICoWRead<'read, ITEM>
[INFO] [stdout]    | -------------------------------------------------------- trait implemented here
[INFO] [stdout] 37 | {
[INFO] [stdout] 38 |     type Target = ITEM;
[INFO] [stdout]    |     ----------- with `Target` set here
[INFO] [stdout] ...
[INFO] [stdout] 68 |     fn upgrade_copy(self) -> ICoWCopy<'read, ITEM> 
[INFO] [stdout]    |                     ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: inherent methods on types that implement `Deref` or `Receiver` shadow methods of their target
[INFO] [stdout]   --> src/cow_refcell.rs:88:27
[INFO] [stdout]    |
[INFO] [stdout] 36 | impl<'read, ITEM: Sized> Deref for ICoWRead<'read, ITEM>
[INFO] [stdout]    | -------------------------------------------------------- trait implemented here
[INFO] [stdout] 37 | {
[INFO] [stdout] 38 |     type Target = ITEM;
[INFO] [stdout]    |     ----------- with `Target` set here
[INFO] [stdout] ...
[INFO] [stdout] 88 |     fn upgrade_clone_copy(self) -> ICoWCopy<'read, ITEM> 
[INFO] [stdout]    |                           ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: inherent methods on types that implement `Deref` or `Receiver` shadow methods of their target
[INFO] [stdout]    --> src/cow_refcell.rs:108:24
[INFO] [stdout]     |
[INFO] [stdout]  36 | impl<'read, ITEM: Sized> Deref for ICoWRead<'read, ITEM>
[INFO] [stdout]     | -------------------------------------------------------- trait implemented here
[INFO] [stdout]  37 | {
[INFO] [stdout]  38 |     type Target = ITEM;
[INFO] [stdout]     |     ----------- with `Target` set here
[INFO] [stdout] ...
[INFO] [stdout] 108 |     fn upgrade_default(self) -> ICoWCopy<'read, ITEM> 
[INFO] [stdout]     |                        ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: inherent methods on types that implement `Deref` or `Receiver` shadow methods of their target
[INFO] [stdout]    --> src/cow_refcell.rs:165:17
[INFO] [stdout]     |
[INFO] [stdout] 142 | impl<'copy, ITEM: Sized> Deref for ICoWCopy<'copy, ITEM>
[INFO] [stdout]     | -------------------------------------------------------- trait implemented here
[INFO] [stdout] 143 | {
[INFO] [stdout] 144 |     type Target = ITEM;
[INFO] [stdout]     |     ----------- with `Target` set here
[INFO] [stdout] ...
[INFO] [stdout] 165 |     fn prev_val(&self) -> &ITEM
[INFO] [stdout]     |                 ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: inherent methods on types that implement `Deref` or `Receiver` shadow methods of their target
[INFO] [stdout]    --> src/cow_refcell.rs:176:15
[INFO] [stdout]     |
[INFO] [stdout] 142 | impl<'copy, ITEM: Sized> Deref for ICoWCopy<'copy, ITEM>
[INFO] [stdout]     | -------------------------------------------------------- trait implemented here
[INFO] [stdout] 143 | {
[INFO] [stdout] 144 |     type Target = ITEM;
[INFO] [stdout]     |     ----------- with `Target` set here
[INFO] [stdout] ...
[INFO] [stdout] 176 |     fn commit(self)
[INFO] [stdout]     |               ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: inherent methods on types that implement `Deref` or `Receiver` shadow methods of their target
[INFO] [stdout]    --> src/cow_refcell.rs:187:19
[INFO] [stdout]     |
[INFO] [stdout] 142 | impl<'copy, ITEM: Sized> Deref for ICoWCopy<'copy, ITEM>
[INFO] [stdout]     | -------------------------------------------------------- trait implemented here
[INFO] [stdout] 143 | {
[INFO] [stdout] 144 |     type Target = ITEM;
[INFO] [stdout]     |     ----------- with `Target` set here
[INFO] [stdout] ...
[INFO] [stdout] 187 |     fn into_inner(self) -> ITEM
[INFO] [stdout]     |                   ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `read0`
[INFO] [stdout]    --> src/lib.rs:176:17
[INFO] [stdout]     |
[INFO] [stdout] 176 |             let read0 = icow.read();
[INFO] [stdout]     |                 ^^^^^ help: if this is intentional, prefix it with an underscore: `_read0`
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unused_variables)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `read1`
[INFO] [stdout]    --> src/lib.rs:221:13
[INFO] [stdout]     |
[INFO] [stdout] 221 |         let read1 = icow.read();
[INFO] [stdout]     |             ^^^^^ help: if this is intentional, prefix it with an underscore: `_read1`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `rc`
[INFO] [stdout]    --> src/lib.rs:425:18
[INFO] [stdout]     |
[INFO] [stdout] 425 |         let (se, rc) = mpsc::channel::<()>();
[INFO] [stdout]     |                  ^^ help: if this is intentional, prefix it with an underscore: `_rc`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `read0`
[INFO] [stdout]    --> src/lib.rs:493:13
[INFO] [stdout]     |
[INFO] [stdout] 493 |         let read0 = icow.read();
[INFO] [stdout]     |             ^^^^^ help: if this is intentional, prefix it with an underscore: `_read0`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `read2`
[INFO] [stdout]    --> src/lib.rs:494:13
[INFO] [stdout]     |
[INFO] [stdout] 494 |         let read2 = icow.read();
[INFO] [stdout]     |             ^^^^^ help: if this is intentional, prefix it with an underscore: `_read2`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `read0`
[INFO] [stdout]    --> src/lib.rs:686:17
[INFO] [stdout]     |
[INFO] [stdout] 686 |             let read0 = icow.read();
[INFO] [stdout]     |                 ^^^^^ help: if this is intentional, prefix it with an underscore: `_read0`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `read2`
[INFO] [stdout]    --> src/lib.rs:687:17
[INFO] [stdout]     |
[INFO] [stdout] 687 |             let read2 = icow.read();
[INFO] [stdout]     |                 ^^^^^ help: if this is intentional, prefix it with an underscore: `_read2`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field `s` is never read
[INFO] [stdout]    --> src/lib.rs:168:23
[INFO] [stdout]     |
[INFO] [stdout] 168 |         struct Test { s: String }
[INFO] [stdout]     |                ----   ^
[INFO] [stdout]     |                |
[INFO] [stdout]     |                field in this struct
[INFO] [stdout]     |
[INFO] [stdout]     = note: `Test` has derived impls for the traits `Clone` and `Debug`, but these are intentionally ignored during dead code analysis
[INFO] [stdout]     = note: `#[warn(dead_code)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field `s` is never read
[INFO] [stdout]    --> src/lib.rs:189:23
[INFO] [stdout]     |
[INFO] [stdout] 189 |         struct Test { s: String };
[INFO] [stdout]     |                ----   ^
[INFO] [stdout]     |                |
[INFO] [stdout]     |                field in this struct
[INFO] [stdout]     |
[INFO] [stdout]     = note: `Test` has derived impls for the traits `Clone` and `Debug`, but these are intentionally ignored during dead code analysis
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: inherent methods on types that implement `Deref` or `Receiver` shadow methods of their target
[INFO] [stdout]   --> src/cow_mutex.rs:53:21
[INFO] [stdout]    |
[INFO] [stdout] 38 | impl<'weak, ITEM: Sized> Deref for ICoWWeakRead<'weak, ITEM>
[INFO] [stdout]    | ------------------------------------------------------------ trait implemented here
[INFO] [stdout] 39 | {
[INFO] [stdout] 40 |     type Target = ITEM;
[INFO] [stdout]    |     ----------- with `Target` set here
[INFO] [stdout] ...
[INFO] [stdout] 53 |     fn item_updated(&self) -> bool
[INFO] [stdout]    |                     ^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: requested on the command line with `-D inherent-method-on-receiver`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: inherent methods on types that implement `Deref` or `Receiver` shadow methods of their target
[INFO] [stdout]    --> src/cow_mutex.rs:133:30
[INFO] [stdout]     |
[INFO] [stdout] 119 | impl<'read, ITEM: Sized> Deref for ICoWRead<'read, ITEM>
[INFO] [stdout]     | -------------------------------------------------------- trait implemented here
[INFO] [stdout] 120 | {
[INFO] [stdout] 121 |     type Target = ITEM;
[INFO] [stdout]     |     ----------- with `Target` set here
[INFO] [stdout] ...
[INFO] [stdout] 133 |     fn clone_copy_into_inner(self) -> ITEM
[INFO] [stdout]     |                              ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: inherent methods on types that implement `Deref` or `Receiver` shadow methods of their target
[INFO] [stdout]    --> src/cow_mutex.rs:143:24
[INFO] [stdout]     |
[INFO] [stdout] 119 | impl<'read, ITEM: Sized> Deref for ICoWRead<'read, ITEM>
[INFO] [stdout]     | -------------------------------------------------------- trait implemented here
[INFO] [stdout] 120 | {
[INFO] [stdout] 121 |     type Target = ITEM;
[INFO] [stdout]     |     ----------- with `Target` set here
[INFO] [stdout] ...
[INFO] [stdout] 143 |     fn copy_into_inner(self) -> ITEM
[INFO] [stdout]     |                        ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: inherent methods on types that implement `Deref` or `Receiver` shadow methods of their target
[INFO] [stdout]    --> src/cow_mutex.rs:153:13
[INFO] [stdout]     |
[INFO] [stdout] 119 | impl<'read, ITEM: Sized> Deref for ICoWRead<'read, ITEM>
[INFO] [stdout]     | -------------------------------------------------------- trait implemented here
[INFO] [stdout] 120 | {
[INFO] [stdout] 121 |     type Target = ITEM;
[INFO] [stdout]     |     ----------- with `Target` set here
[INFO] [stdout] ...
[INFO] [stdout] 153 |     fn weak(&self) -> Weak<ITEM>
[INFO] [stdout]     |             ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: inherent methods on types that implement `Deref` or `Receiver` shadow methods of their target
[INFO] [stdout]    --> src/cow_mutex.rs:164:21
[INFO] [stdout]     |
[INFO] [stdout] 119 | impl<'read, ITEM: Sized> Deref for ICoWRead<'read, ITEM>
[INFO] [stdout]     | -------------------------------------------------------- trait implemented here
[INFO] [stdout] 120 | {
[INFO] [stdout] 121 |     type Target = ITEM;
[INFO] [stdout]     |     ----------- with `Target` set here
[INFO] [stdout] ...
[INFO] [stdout] 164 |     fn upgrade_copy(self) -> ICoWCopy<'read, ITEM> 
[INFO] [stdout]     |                     ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: inherent methods on types that implement `Deref` or `Receiver` shadow methods of their target
[INFO] [stdout]    --> src/cow_mutex.rs:184:27
[INFO] [stdout]     |
[INFO] [stdout] 119 | impl<'read, ITEM: Sized> Deref for ICoWRead<'read, ITEM>
[INFO] [stdout]     | -------------------------------------------------------- trait implemented here
[INFO] [stdout] 120 | {
[INFO] [stdout] 121 |     type Target = ITEM;
[INFO] [stdout]     |     ----------- with `Target` set here
[INFO] [stdout] ...
[INFO] [stdout] 184 |     fn upgrade_clone_copy(self) -> ICoWCopy<'read, ITEM> 
[INFO] [stdout]     |                           ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: inherent methods on types that implement `Deref` or `Receiver` shadow methods of their target
[INFO] [stdout]    --> src/cow_mutex.rs:204:24
[INFO] [stdout]     |
[INFO] [stdout] 119 | impl<'read, ITEM: Sized> Deref for ICoWRead<'read, ITEM>
[INFO] [stdout]     | -------------------------------------------------------- trait implemented here
[INFO] [stdout] 120 | {
[INFO] [stdout] 121 |     type Target = ITEM;
[INFO] [stdout]     |     ----------- with `Target` set here
[INFO] [stdout] ...
[INFO] [stdout] 204 |     fn upgrade_default(self) -> ICoWCopy<'read, ITEM> 
[INFO] [stdout]     |                        ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: inherent methods on types that implement `Deref` or `Receiver` shadow methods of their target
[INFO] [stdout]    --> src/cow_mutex.rs:261:17
[INFO] [stdout]     |
[INFO] [stdout] 238 | impl<'copy, ITEM: Sized> Deref for ICoWCopy<'copy, ITEM>
[INFO] [stdout]     | -------------------------------------------------------- trait implemented here
[INFO] [stdout] 239 | {
[INFO] [stdout] 240 |     type Target = ITEM;
[INFO] [stdout]     |     ----------- with `Target` set here
[INFO] [stdout] ...
[INFO] [stdout] 261 |     fn prev_val(&self) -> &ITEM
[INFO] [stdout]     |                 ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: inherent methods on types that implement `Deref` or `Receiver` shadow methods of their target
[INFO] [stdout]    --> src/cow_mutex.rs:288:15
[INFO] [stdout]     |
[INFO] [stdout] 238 | impl<'copy, ITEM: Sized> Deref for ICoWCopy<'copy, ITEM>
[INFO] [stdout]     | -------------------------------------------------------- trait implemented here
[INFO] [stdout] 239 | {
[INFO] [stdout] 240 |     type Target = ITEM;
[INFO] [stdout]     |     ----------- with `Target` set here
[INFO] [stdout] ...
[INFO] [stdout] 288 |     fn commit(self) -> Result<(), (ICoWError, Self)>
[INFO] [stdout]     |               ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: inherent methods on types that implement `Deref` or `Receiver` shadow methods of their target
[INFO] [stdout]    --> src/cow_mutex.rs:340:24
[INFO] [stdout]     |
[INFO] [stdout] 238 | impl<'copy, ITEM: Sized> Deref for ICoWCopy<'copy, ITEM>
[INFO] [stdout]     | -------------------------------------------------------- trait implemented here
[INFO] [stdout] 239 | {
[INFO] [stdout] 240 |     type Target = ITEM;
[INFO] [stdout]     |     ----------- with `Target` set here
[INFO] [stdout] ...
[INFO] [stdout] 340 |     fn commit_blocking(self, ignore_excl: bool) -> Result<(), Self>
[INFO] [stdout]     |                        ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: inherent methods on types that implement `Deref` or `Receiver` shadow methods of their target
[INFO] [stdout]    --> src/cow_mutex.rs:364:19
[INFO] [stdout]     |
[INFO] [stdout] 238 | impl<'copy, ITEM: Sized> Deref for ICoWCopy<'copy, ITEM>
[INFO] [stdout]     | -------------------------------------------------------- trait implemented here
[INFO] [stdout] 239 | {
[INFO] [stdout] 240 |     type Target = ITEM;
[INFO] [stdout]     |     ----------- with `Target` set here
[INFO] [stdout] ...
[INFO] [stdout] 364 |     fn into_inner(self) -> ITEM
[INFO] [stdout]     |                   ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: inherent methods on types that implement `Deref` or `Receiver` shadow methods of their target
[INFO] [stdout]    --> src/cow_mutex.rs:410:17
[INFO] [stdout]     |
[INFO] [stdout] 410 |     fn prev_val(&self) -> &ITEM
[INFO] [stdout]     |                 ^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 434 | impl<'lock, ITEM: Sized> Deref for ICoWLock<'lock, ITEM>
[INFO] [stdout]     | -------------------------------------------------------- trait implemented here
[INFO] [stdout] 435 | {
[INFO] [stdout] 436 |     type Target = ITEM;
[INFO] [stdout]     |     ----------- with `Target` set here
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: inherent methods on types that implement `Deref` or `Receiver` shadow methods of their target
[INFO] [stdout]    --> src/cow_mutex.rs:424:15
[INFO] [stdout]     |
[INFO] [stdout] 424 |     fn commit(mut self)
[INFO] [stdout]     |               ^^^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 434 | impl<'lock, ITEM: Sized> Deref for ICoWLock<'lock, ITEM>
[INFO] [stdout]     | -------------------------------------------------------- trait implemented here
[INFO] [stdout] 435 | {
[INFO] [stdout] 436 |     type Target = ITEM;
[INFO] [stdout]     |     ----------- with `Target` set here
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: inherent methods on types that implement `Deref` or `Receiver` shadow methods of their target
[INFO] [stdout]   --> src/cow_refcell.rs:50:19
[INFO] [stdout]    |
[INFO] [stdout] 36 | impl<'read, ITEM: Sized> Deref for ICoWRead<'read, ITEM>
[INFO] [stdout]    | -------------------------------------------------------- trait implemented here
[INFO] [stdout] 37 | {
[INFO] [stdout] 38 |     type Target = ITEM;
[INFO] [stdout]    |     ----------- with `Target` set here
[INFO] [stdout] ...
[INFO] [stdout] 50 |     fn into_inner(self) -> Rc<ITEM>
[INFO] [stdout]    |                   ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: inherent methods on types that implement `Deref` or `Receiver` shadow methods of their target
[INFO] [stdout]   --> src/cow_refcell.rs:57:13
[INFO] [stdout]    |
[INFO] [stdout] 36 | impl<'read, ITEM: Sized> Deref for ICoWRead<'read, ITEM>
[INFO] [stdout]    | -------------------------------------------------------- trait implemented here
[INFO] [stdout] 37 | {
[INFO] [stdout] 38 |     type Target = ITEM;
[INFO] [stdout]    |     ----------- with `Target` set here
[INFO] [stdout] ...
[INFO] [stdout] 57 |     fn weak(&self) -> Weak<ITEM>
[INFO] [stdout]    |             ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: inherent methods on types that implement `Deref` or `Receiver` shadow methods of their target
[INFO] [stdout]   --> src/cow_refcell.rs:68:21
[INFO] [stdout]    |
[INFO] [stdout] 36 | impl<'read, ITEM: Sized> Deref for ICoWRead<'read, ITEM>
[INFO] [stdout]    | -------------------------------------------------------- trait implemented here
[INFO] [stdout] 37 | {
[INFO] [stdout] 38 |     type Target = ITEM;
[INFO] [stdout]    |     ----------- with `Target` set here
[INFO] [stdout] ...
[INFO] [stdout] 68 |     fn upgrade_copy(self) -> ICoWCopy<'read, ITEM> 
[INFO] [stdout]    |                     ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: inherent methods on types that implement `Deref` or `Receiver` shadow methods of their target
[INFO] [stdout]   --> src/cow_refcell.rs:88:27
[INFO] [stdout]    |
[INFO] [stdout] 36 | impl<'read, ITEM: Sized> Deref for ICoWRead<'read, ITEM>
[INFO] [stdout]    | -------------------------------------------------------- trait implemented here
[INFO] [stdout] 37 | {
[INFO] [stdout] 38 |     type Target = ITEM;
[INFO] [stdout]    |     ----------- with `Target` set here
[INFO] [stdout] ...
[INFO] [stdout] 88 |     fn upgrade_clone_copy(self) -> ICoWCopy<'read, ITEM> 
[INFO] [stdout]    |                           ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: inherent methods on types that implement `Deref` or `Receiver` shadow methods of their target
[INFO] [stdout]    --> src/cow_refcell.rs:108:24
[INFO] [stdout]     |
[INFO] [stdout]  36 | impl<'read, ITEM: Sized> Deref for ICoWRead<'read, ITEM>
[INFO] [stdout]     | -------------------------------------------------------- trait implemented here
[INFO] [stdout]  37 | {
[INFO] [stdout]  38 |     type Target = ITEM;
[INFO] [stdout]     |     ----------- with `Target` set here
[INFO] [stdout] ...
[INFO] [stdout] 108 |     fn upgrade_default(self) -> ICoWCopy<'read, ITEM> 
[INFO] [stdout]     |                        ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: inherent methods on types that implement `Deref` or `Receiver` shadow methods of their target
[INFO] [stdout]    --> src/cow_refcell.rs:165:17
[INFO] [stdout]     |
[INFO] [stdout] 142 | impl<'copy, ITEM: Sized> Deref for ICoWCopy<'copy, ITEM>
[INFO] [stdout]     | -------------------------------------------------------- trait implemented here
[INFO] [stdout] 143 | {
[INFO] [stdout] 144 |     type Target = ITEM;
[INFO] [stdout]     |     ----------- with `Target` set here
[INFO] [stdout] ...
[INFO] [stdout] 165 |     fn prev_val(&self) -> &ITEM
[INFO] [stdout]     |                 ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: inherent methods on types that implement `Deref` or `Receiver` shadow methods of their target
[INFO] [stdout]    --> src/cow_refcell.rs:176:15
[INFO] [stdout]     |
[INFO] [stdout] 142 | impl<'copy, ITEM: Sized> Deref for ICoWCopy<'copy, ITEM>
[INFO] [stdout]     | -------------------------------------------------------- trait implemented here
[INFO] [stdout] 143 | {
[INFO] [stdout] 144 |     type Target = ITEM;
[INFO] [stdout]     |     ----------- with `Target` set here
[INFO] [stdout] ...
[INFO] [stdout] 176 |     fn commit(self)
[INFO] [stdout]     |               ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: inherent methods on types that implement `Deref` or `Receiver` shadow methods of their target
[INFO] [stdout]    --> src/cow_refcell.rs:187:19
[INFO] [stdout]     |
[INFO] [stdout] 142 | impl<'copy, ITEM: Sized> Deref for ICoWCopy<'copy, ITEM>
[INFO] [stdout]     | -------------------------------------------------------- trait implemented here
[INFO] [stdout] 143 | {
[INFO] [stdout] 144 |     type Target = ITEM;
[INFO] [stdout]     |     ----------- with `Target` set here
[INFO] [stdout] ...
[INFO] [stdout] 187 |     fn into_inner(self) -> ITEM
[INFO] [stdout]     |                   ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `Result` that must be used
[INFO] [stdout]    --> src/lib.rs:471:17
[INFO] [stdout]     |
[INFO] [stdout] 471 |                 se2.send(());
[INFO] [stdout]     |                 ^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stdout]     = note: `#[warn(unused_must_use)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] help: use `let _ = ...` to ignore the resulting value
[INFO] [stdout]     |
[INFO] [stdout] 471 |                 let _ = se2.send(());
[INFO] [stdout]     |                 +++++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `instance-copy-on-write` (lib test) due to 21 previous errors; 11 warnings emitted
[INFO] running `Command { std: "docker" "inspect" "99a3b09289a0430780f7d873351b5ff08a6b6cb2347942ba30c719195e8bca9c", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "99a3b09289a0430780f7d873351b5ff08a6b6cb2347942ba30c719195e8bca9c", kill_on_drop: false }`
[INFO] [stdout] 99a3b09289a0430780f7d873351b5ff08a6b6cb2347942ba30c719195e8bca9c