[INFO] fetching crate syntactic_heap 0.3.1...
[INFO] checking syntactic_heap-0.3.1 against try#7b3da9103634dffd4f4365cfd8642427c781d99f+rustflags=-Dinherent-method-on-receiver for 152214-denied-retry-0
[INFO] extracting crate syntactic_heap 0.3.1 into /workspace/builds/worker-5-tc2/source
[INFO] started tweaking crates.io crate syntactic_heap 0.3.1
[INFO] finished tweaking crates.io crate syntactic_heap 0.3.1
[INFO] tweaked toml for crates.io crate syntactic_heap 0.3.1 written to /workspace/builds/worker-5-tc2/source/Cargo.toml
[INFO] validating manifest of crates.io crate syntactic_heap 0.3.1 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] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+7b3da9103634dffd4f4365cfd8642427c781d99f" "generate-lockfile" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[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-5-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-5-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] 98d2ef4301aeba12b3d1341bf55618eaf44549727afb3a2033a37d0472385d3e
[INFO] running `Command { std: "docker" "start" "-a" "98d2ef4301aeba12b3d1341bf55618eaf44549727afb3a2033a37d0472385d3e", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "98d2ef4301aeba12b3d1341bf55618eaf44549727afb3a2033a37d0472385d3e", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "98d2ef4301aeba12b3d1341bf55618eaf44549727afb3a2033a37d0472385d3e", kill_on_drop: false }`
[INFO] [stdout] 98d2ef4301aeba12b3d1341bf55618eaf44549727afb3a2033a37d0472385d3e
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-5-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-5-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] 42237a4e29cb947c66f661136a2720eba87db4ddbd59d585eb1b2f1a84e92144
[INFO] running `Command { std: "docker" "start" "-a" "42237a4e29cb947c66f661136a2720eba87db4ddbd59d585eb1b2f1a84e92144", kill_on_drop: false }`
[INFO] [stderr]     Checking syntactic_heap v0.3.1 (/opt/rustwide/workdir)
[INFO] [stdout] warning: unused `Result` that must be used
[INFO] [stdout]   --> src/lib.rs:72:2
[INFO] [stdout]    |
[INFO] [stdout] 72 |     write!(f,"[");
[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] 72 |     let _ = write!(f,"[");
[INFO] [stdout]    |     +++++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `Result` that must be used
[INFO] [stdout]   --> src/lib.rs:74:18
[INFO] [stdout]    |
[INFO] [stdout] 74 |         if !first { write!(f,","); }
[INFO] [stdout]    |                     ^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stdout] help: use `let _ = ...` to ignore the resulting value
[INFO] [stdout]    |
[INFO] [stdout] 74 |         if !first { let _ = write!(f,","); }
[INFO] [stdout]    |                     +++++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `Result` that must be used
[INFO] [stdout]   --> src/lib.rs:76:6
[INFO] [stdout]    |
[INFO] [stdout] 76 |         write!(f,"{}",item);
[INFO] [stdout]    |         ^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stdout] help: use `let _ = ...` to ignore the resulting value
[INFO] [stdout]    |
[INFO] [stdout] 76 |         let _ = write!(f,"{}",item);
[INFO] [stdout]    |         +++++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `Result` that must be used
[INFO] [stdout]   --> src/lib.rs:86:2
[INFO] [stdout]    |
[INFO] [stdout] 86 |     write!(f,"[");
[INFO] [stdout]    |     ^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stdout] help: use `let _ = ...` to ignore the resulting value
[INFO] [stdout]    |
[INFO] [stdout] 86 |     let _ = write!(f,"[");
[INFO] [stdout]    |     +++++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `Result` that must be used
[INFO] [stdout]   --> src/lib.rs:88:18
[INFO] [stdout]    |
[INFO] [stdout] 88 |         if !first { write!(f,","); }
[INFO] [stdout]    |                     ^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stdout] help: use `let _ = ...` to ignore the resulting value
[INFO] [stdout]    |
[INFO] [stdout] 88 |         if !first { let _ = write!(f,","); }
[INFO] [stdout]    |                     +++++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `Result` that must be used
[INFO] [stdout]   --> src/lib.rs:90:6
[INFO] [stdout]    |
[INFO] [stdout] 90 |         write!(f,"{:?}",item);
[INFO] [stdout]    |         ^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stdout] help: use `let _ = ...` to ignore the resulting value
[INFO] [stdout]    |
[INFO] [stdout] 90 |         let _ = write!(f,"{:?}",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/lib.rs:115:16
[INFO] [stdout]     |
[INFO] [stdout] 115 |     pub fn get(&self) -> &T {
[INFO] [stdout]     |                ^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 136 | impl<'a,T> Deref for Ref<'a,T> {
[INFO] [stdout]     | ------------------------------ trait implemented here
[INFO] [stdout] 137 |     type Target = T;
[INFO] [stdout]     |     ----------- with `Target` set here
[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/lib.rs:121:22
[INFO] [stdout]     |
[INFO] [stdout] 121 |     pub fn raw_index(&self) -> usize {
[INFO] [stdout]     |                      ^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 136 | impl<'a,T> Deref for Ref<'a,T> {
[INFO] [stdout]     | ------------------------------ trait implemented here
[INFO] [stdout] 137 |     type Target = T;
[INFO] [stdout]     |     ----------- with `Target` set here
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `syntactic_heap` (lib test) due to 2 previous errors; 6 warnings emitted
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[INFO] [stdout] warning: unused `Result` that must be used
[INFO] [stdout]   --> src/lib.rs:72:2
[INFO] [stdout]    |
[INFO] [stdout] 72 |     write!(f,"[");
[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] 72 |     let _ = write!(f,"[");
[INFO] [stdout]    |     +++++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `Result` that must be used
[INFO] [stdout]   --> src/lib.rs:74:18
[INFO] [stdout]    |
[INFO] [stdout] 74 |         if !first { write!(f,","); }
[INFO] [stdout]    |                     ^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stdout] help: use `let _ = ...` to ignore the resulting value
[INFO] [stdout]    |
[INFO] [stdout] 74 |         if !first { let _ = write!(f,","); }
[INFO] [stdout]    |                     +++++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `Result` that must be used
[INFO] [stdout]   --> src/lib.rs:76:6
[INFO] [stdout]    |
[INFO] [stdout] 76 |         write!(f,"{}",item);
[INFO] [stdout]    |         ^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stdout] help: use `let _ = ...` to ignore the resulting value
[INFO] [stdout]    |
[INFO] [stdout] 76 |         let _ = write!(f,"{}",item);
[INFO] [stdout]    |         +++++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `Result` that must be used
[INFO] [stdout]   --> src/lib.rs:86:2
[INFO] [stdout]    |
[INFO] [stdout] 86 |     write!(f,"[");
[INFO] [stdout]    |     ^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stdout] help: use `let _ = ...` to ignore the resulting value
[INFO] [stdout]    |
[INFO] [stdout] 86 |     let _ = write!(f,"[");
[INFO] [stdout]    |     +++++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `Result` that must be used
[INFO] [stdout]   --> src/lib.rs:88:18
[INFO] [stdout]    |
[INFO] [stdout] 88 |         if !first { write!(f,","); }
[INFO] [stdout]    |                     ^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stdout] help: use `let _ = ...` to ignore the resulting value
[INFO] [stdout]    |
[INFO] [stdout] 88 |         if !first { let _ = write!(f,","); }
[INFO] [stdout]    |                     +++++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `Result` that must be used
[INFO] [stdout]   --> src/lib.rs:90:6
[INFO] [stdout]    |
[INFO] [stdout] 90 |         write!(f,"{:?}",item);
[INFO] [stdout]    |         ^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stdout] help: use `let _ = ...` to ignore the resulting value
[INFO] [stdout]    |
[INFO] [stdout] 90 |         let _ = write!(f,"{:?}",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/lib.rs:115:16
[INFO] [stdout]     |
[INFO] [stdout] 115 |     pub fn get(&self) -> &T {
[INFO] [stdout]     |                ^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 136 | impl<'a,T> Deref for Ref<'a,T> {
[INFO] [stdout]     | ------------------------------ trait implemented here
[INFO] [stdout] 137 |     type Target = T;
[INFO] [stdout]     |     ----------- with `Target` set here
[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/lib.rs:121:22
[INFO] [stdout]     |
[INFO] [stdout] 121 |     pub fn raw_index(&self) -> usize {
[INFO] [stdout]     |                      ^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 136 | impl<'a,T> Deref for Ref<'a,T> {
[INFO] [stdout]     | ------------------------------ trait implemented here
[INFO] [stdout] 137 |     type Target = T;
[INFO] [stdout]     |     ----------- with `Target` set here
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `syntactic_heap` (lib) due to 2 previous errors; 6 warnings emitted
[INFO] running `Command { std: "docker" "inspect" "42237a4e29cb947c66f661136a2720eba87db4ddbd59d585eb1b2f1a84e92144", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "42237a4e29cb947c66f661136a2720eba87db4ddbd59d585eb1b2f1a84e92144", kill_on_drop: false }`
[INFO] [stdout] 42237a4e29cb947c66f661136a2720eba87db4ddbd59d585eb1b2f1a84e92144