[INFO] fetching crate index_alloc 0.1.1...
[INFO] checking index_alloc-0.1.1 against try#998b6603a58e47f42ccce7a67943234e96b6839e for pr-143170
[INFO] extracting crate index_alloc 0.1.1 into /workspace/builds/worker-4-tc2/source
[INFO] started tweaking crates.io crate index_alloc 0.1.1
[INFO] removed 0 missing examples
[INFO] finished tweaking crates.io crate index_alloc 0.1.1
[INFO] tweaked toml for crates.io crate index_alloc 0.1.1 written to /workspace/builds/worker-4-tc2/source/Cargo.toml
[INFO] validating manifest of crates.io crate index_alloc 0.1.1 on toolchain 998b6603a58e47f42ccce7a67943234e96b6839e
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+998b6603a58e47f42ccce7a67943234e96b6839e" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] crate crates.io crate index_alloc 0.1.1 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" "+998b6603a58e47f42ccce7a67943234e96b6839e" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-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@sha256:90999bfc7ae267e83380e433d8e61a7c072ca6729e92edbae886d3423b3a6f4c" "/opt/rustwide/cargo-home/bin/cargo" "+998b6603a58e47f42ccce7a67943234e96b6839e" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] aacf7292f8443d4bce52bd044cff08ad23a40920b836ac5c7d2eb95e8aae2b41
[INFO] running `Command { std: "docker" "start" "-a" "aacf7292f8443d4bce52bd044cff08ad23a40920b836ac5c7d2eb95e8aae2b41", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "aacf7292f8443d4bce52bd044cff08ad23a40920b836ac5c7d2eb95e8aae2b41", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "aacf7292f8443d4bce52bd044cff08ad23a40920b836ac5c7d2eb95e8aae2b41", kill_on_drop: false }`
[INFO] [stdout] aacf7292f8443d4bce52bd044cff08ad23a40920b836ac5c7d2eb95e8aae2b41
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-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@sha256:90999bfc7ae267e83380e433d8e61a7c072ca6729e92edbae886d3423b3a6f4c" "/opt/rustwide/cargo-home/bin/cargo" "+998b6603a58e47f42ccce7a67943234e96b6839e" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 16f790ea61935b30765b6a6cad539bdd53b31a3b279b0f5056795330b9f77634
[INFO] running `Command { std: "docker" "start" "-a" "16f790ea61935b30765b6a6cad539bdd53b31a3b279b0f5056795330b9f77634", kill_on_drop: false }`
[INFO] [stderr]     Checking index_alloc v0.1.1 (/opt/rustwide/workdir)
[INFO] [stdout] warning: `#[must_use]` has no effect when applied to a provided trait method
[INFO] [stdout]    --> src/lib.rs:167:5
[INFO] [stdout]     |
[INFO] [stdout] 167 |     #[must_use]
[INFO] [stdout]     |     ^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unused_attributes)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: `#[must_use]` has no effect when applied to a provided trait method
[INFO] [stdout]    --> src/rc.rs:193:5
[INFO] [stdout]     |
[INFO] [stdout] 193 |     #[must_use]
[INFO] [stdout]     |     ^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: `#[must_use]` has no effect when applied to a provided trait method
[INFO] [stdout]    --> src/lib.rs:167:5
[INFO] [stdout]     |
[INFO] [stdout] 167 |     #[must_use]
[INFO] [stdout]     |     ^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unused_attributes)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: `#[must_use]` has no effect when applied to a provided trait method
[INFO] [stdout]    --> src/rc.rs:193:5
[INFO] [stdout]     |
[INFO] [stdout] 193 |     #[must_use]
[INFO] [stdout]     |     ^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: lifetime flowing from input to output with different syntax can be confusing
[INFO] [stdout]    --> src/lib.rs:152:10
[INFO] [stdout]     |
[INFO] [stdout] 152 |         &'a self,
[INFO] [stdout]     |          ^^ this lifetime flows to the output
[INFO] [stdout] 153 |         val: U,
[INFO] [stdout] 154 |     ) -> Result<Box<T, MEMORY_SIZE, INDEX_SIZE>, IndexError>
[INFO] [stdout]     |                 ------------------------------- the lifetime gets resolved as `'a`
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(mismatched_lifetime_syntaxes)]` on by default
[INFO] [stdout] help: one option is to consistently use `'a`
[INFO] [stdout]     |
[INFO] [stdout] 154 |     ) -> Result<Box<'a, T, MEMORY_SIZE, INDEX_SIZE>, IndexError>
[INFO] [stdout]     |                     +++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: lifetime flowing from input to output with different syntax can be confusing
[INFO] [stdout]    --> src/lib.rs:152:10
[INFO] [stdout]     |
[INFO] [stdout] 152 |         &'a self,
[INFO] [stdout]     |          ^^ this lifetime flows to the output
[INFO] [stdout] 153 |         val: U,
[INFO] [stdout] 154 |     ) -> Result<Box<T, MEMORY_SIZE, INDEX_SIZE>, IndexError>
[INFO] [stdout]     |                 ------------------------------- the lifetime gets resolved as `'a`
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(mismatched_lifetime_syntaxes)]` on by default
[INFO] [stdout] help: one option is to consistently use `'a`
[INFO] [stdout]     |
[INFO] [stdout] 154 |     ) -> Result<Box<'a, T, MEMORY_SIZE, INDEX_SIZE>, IndexError>
[INFO] [stdout]     |                     +++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function `new_weak` is never used
[INFO] [stdout]   --> examples/rc_graph.rs:18:8
[INFO] [stdout]    |
[INFO] [stdout] 13 | impl<'a, T> Link<'a, T> {
[INFO] [stdout]    | ----------------------- associated function in this implementation
[INFO] [stdout] ...
[INFO] [stdout] 18 |     fn new_weak(node: Weak<'a, Node<'a, T>, MEMORY_SIZE, INDEX_SIZE>) -> Self {
[INFO] [stdout]    |        ^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished `dev` profile [unoptimized + debuginfo] target(s) in 0.47s
[INFO] running `Command { std: "docker" "inspect" "16f790ea61935b30765b6a6cad539bdd53b31a3b279b0f5056795330b9f77634", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "16f790ea61935b30765b6a6cad539bdd53b31a3b279b0f5056795330b9f77634", kill_on_drop: false }`
[INFO] [stdout] 16f790ea61935b30765b6a6cad539bdd53b31a3b279b0f5056795330b9f77634