[INFO] cloning repository https://github.com/soniceroy/RustBlockchain
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/soniceroy/RustBlockchain" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fsoniceroy%2FRustBlockchain", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fsoniceroy%2FRustBlockchain'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] c33433ce9ef133f14b9a808520b6b0bc275bbc9b
[INFO] checking soniceroy/RustBlockchain against master#8424f8e8cdf07010967a57584fd647b30e930d4d for pr-120095
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fsoniceroy%2FRustBlockchain" "/workspace/builds/worker-5-tc1/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-5-tc1/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/soniceroy/RustBlockchain on toolchain 8424f8e8cdf07010967a57584fd647b30e930d4d
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+8424f8e8cdf07010967a57584fd647b30e930d4d" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/soniceroy/RustBlockchain
[INFO] finished tweaking git repo https://github.com/soniceroy/RustBlockchain
[INFO] tweaked toml for git repo https://github.com/soniceroy/RustBlockchain written to /workspace/builds/worker-5-tc1/source/Cargo.toml
[INFO] crate git repo https://github.com/soniceroy/RustBlockchain 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" "+8424f8e8cdf07010967a57584fd647b30e930d4d" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[ERROR] error running command: no output for 300 seconds
[ERROR] this task or one of its parent failed!
[ERROR] no output for 300 seconds
[ERROR] note: run with `RUST_BACKTRACE=1` to display a backtrace.
[INFO] checking soniceroy/RustBlockchain against try#047472f299946caf090d1b5608ae4bd9f0416256+rustflags=-Ddereferencing_mut_binding for pr-120095
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fsoniceroy%2FRustBlockchain" "/workspace/builds/worker-5-tc2/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-5-tc2/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/soniceroy/RustBlockchain on toolchain 047472f299946caf090d1b5608ae4bd9f0416256
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+047472f299946caf090d1b5608ae4bd9f0416256" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/soniceroy/RustBlockchain
[INFO] finished tweaking git repo https://github.com/soniceroy/RustBlockchain
[INFO] tweaked toml for git repo https://github.com/soniceroy/RustBlockchain written to /workspace/builds/worker-5-tc2/source/Cargo.toml
[INFO] crate git repo https://github.com/soniceroy/RustBlockchain 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" "+047472f299946caf090d1b5608ae4bd9f0416256" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]     Blocking waiting for file lock on package cache
[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@sha256:2788e3201cd34a07e3172128adcd8b3090168a8e3bcc40d7c032b9dda1df7d1c" "/opt/rustwide/cargo-home/bin/cargo" "+047472f299946caf090d1b5608ae4bd9f0416256" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 5aaa070bba5bbd192d883d4090091683a8c84170456c189f84dda13f8396e2e1
[INFO] running `Command { std: "docker" "start" "-a" "5aaa070bba5bbd192d883d4090091683a8c84170456c189f84dda13f8396e2e1", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "5aaa070bba5bbd192d883d4090091683a8c84170456c189f84dda13f8396e2e1", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "5aaa070bba5bbd192d883d4090091683a8c84170456c189f84dda13f8396e2e1", kill_on_drop: false }`
[INFO] [stdout] 5aaa070bba5bbd192d883d4090091683a8c84170456c189f84dda13f8396e2e1
[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 -Ddereferencing_mut_binding" "-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@sha256:2788e3201cd34a07e3172128adcd8b3090168a8e3bcc40d7c032b9dda1df7d1c" "/opt/rustwide/cargo-home/bin/cargo" "+047472f299946caf090d1b5608ae4bd9f0416256" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 7c9e0df0b0fdbdfaddeef054cede07cdbfee85301a6dadd0c7e3f0c622040f70
[INFO] running `Command { std: "docker" "start" "-a" "7c9e0df0b0fdbdfaddeef054cede07cdbfee85301a6dadd0c7e3f0c622040f70", kill_on_drop: false }`
[INFO] [stderr]     Checking blockchain v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] error: lifetime may not live long enough
[INFO] [stdout]   --> src/main.rs:59:19
[INFO] [stdout]    |
[INFO] [stdout] 50 | impl <'a>Blockchain<'a> {
[INFO] [stdout]    |       -- lifetime `'a` defined here
[INFO] [stdout] ...
[INFO] [stdout] 57 |     fn new_block(&mut self) {
[INFO] [stdout]    |                  - let's call the lifetime of this reference `'1`
[INFO] [stdout] 58 |
[INFO] [stdout] 59 |         let new_block = Block::new(0, self.current_transactions, 100, 0);
[INFO] [stdout]    |                         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ argument requires that `'1` must outlive `'a`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: lifetime may not live long enough
[INFO] [stdout]   --> src/main.rs:59:19
[INFO] [stdout]    |
[INFO] [stdout] 50 | impl <'a>Blockchain<'a> {
[INFO] [stdout]    |       -- lifetime `'a` defined here
[INFO] [stdout] ...
[INFO] [stdout] 57 |     fn new_block(&mut self) {
[INFO] [stdout]    |                  - let's call the lifetime of this reference `'1`
[INFO] [stdout] 58 |
[INFO] [stdout] 59 |         let new_block = Block::new(0, self.current_transactions, 100, 0);
[INFO] [stdout]    |                         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ argument requires that `'1` must outlive `'a`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0502]: cannot borrow `*self` as mutable because it is also borrowed as immutable
[INFO] [stdout]   --> src/main.rs:80:4
[INFO] [stdout]    |
[INFO] [stdout] 75 |     fn last_block(&mut self) -> &Block {
[INFO] [stdout]    |                   - let's call the lifetime of this reference `'1`
[INFO] [stdout] 76 |         if let Some(last) = self.chain.first() {
[INFO] [stdout]    |                             ---------- immutable borrow occurs here
[INFO] [stdout] 77 |             &last
[INFO] [stdout]    |             ----- returning this value requires that `self.chain` is borrowed for `'1`
[INFO] [stdout] ...
[INFO] [stdout] 80 |             self.new_block();
[INFO] [stdout]    |             ^^^^^^^^^^^^^^^^ mutable borrow occurs here
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0502]: cannot borrow `*self` as mutable because it is also borrowed as immutable
[INFO] [stdout]   --> src/main.rs:80:4
[INFO] [stdout]    |
[INFO] [stdout] 75 |     fn last_block(&mut self) -> &Block {
[INFO] [stdout]    |                   - let's call the lifetime of this reference `'1`
[INFO] [stdout] 76 |         if let Some(last) = self.chain.first() {
[INFO] [stdout]    |                             ---------- immutable borrow occurs here
[INFO] [stdout] 77 |             &last
[INFO] [stdout]    |             ----- returning this value requires that `self.chain` is borrowed for `'1`
[INFO] [stdout] ...
[INFO] [stdout] 80 |             self.new_block();
[INFO] [stdout]    |             ^^^^^^^^^^^^^^^^ mutable borrow occurs here
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0502]: cannot borrow `*self` as mutable because it is also borrowed as immutable
[INFO] [stdout]   --> src/main.rs:81:4
[INFO] [stdout]    |
[INFO] [stdout] 75 |     fn last_block(&mut self) -> &Block {
[INFO] [stdout]    |                   - let's call the lifetime of this reference `'1`
[INFO] [stdout] 76 |         if let Some(last) = self.chain.first() {
[INFO] [stdout]    |                             ---------- immutable borrow occurs here
[INFO] [stdout] 77 |             &last
[INFO] [stdout]    |             ----- returning this value requires that `self.chain` is borrowed for `'1`
[INFO] [stdout] ...
[INFO] [stdout] 81 |             self.last_block()
[INFO] [stdout]    |             ^^^^^^^^^^^^^^^^^ mutable borrow occurs here
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0502]: cannot borrow `*self` as mutable because it is also borrowed as immutable
[INFO] [stdout]   --> src/main.rs:81:4
[INFO] [stdout]    |
[INFO] [stdout] 75 |     fn last_block(&mut self) -> &Block {
[INFO] [stdout]    |                   - let's call the lifetime of this reference `'1`
[INFO] [stdout] 76 |         if let Some(last) = self.chain.first() {
[INFO] [stdout]    |                             ---------- immutable borrow occurs here
[INFO] [stdout] 77 |             &last
[INFO] [stdout]    |             ----- returning this value requires that `self.chain` is borrowed for `'1`
[INFO] [stdout] ...
[INFO] [stdout] 81 |             self.last_block()
[INFO] [stdout]    |             ^^^^^^^^^^^^^^^^^ mutable borrow occurs here
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `block`
[INFO] [stdout]   --> src/main.rs:86:9
[INFO] [stdout]    |
[INFO] [stdout] 86 | fn hash(block: Blockchain) {
[INFO] [stdout]    |         ^^^^^ help: if this is intentional, prefix it with an underscore: `_block`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `block`
[INFO] [stdout]   --> src/main.rs:86:9
[INFO] [stdout]    |
[INFO] [stdout] 86 | fn hash(block: Blockchain) {
[INFO] [stdout]    |         ^^^^^ help: if this is intentional, prefix it with an underscore: `_block`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: aborting due to 3 previous errors; 1 warning emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: aborting due to 3 previous errors; 1 warning emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] For more information about this error, try `rustc --explain E0502`.
[INFO] [stdout] 
[INFO] [stdout] For more information about this error, try `rustc --explain E0502`.
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `blockchain` (bin "blockchain" test) due to 4 previous errors; 1 warning emitted
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[INFO] [stderr] error: could not compile `blockchain` (bin "blockchain") due to 4 previous errors; 1 warning emitted
[INFO] running `Command { std: "docker" "inspect" "7c9e0df0b0fdbdfaddeef054cede07cdbfee85301a6dadd0c7e3f0c622040f70", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "7c9e0df0b0fdbdfaddeef054cede07cdbfee85301a6dadd0c7e3f0c622040f70", kill_on_drop: false }`
[INFO] [stdout] 7c9e0df0b0fdbdfaddeef054cede07cdbfee85301a6dadd0c7e3f0c622040f70