[INFO] cloning repository https://github.com/K-dash/bookshelf_library
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/K-dash/bookshelf_library" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FK-dash%2Fbookshelf_library", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FK-dash%2Fbookshelf_library'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 54ed960bf8d2ee962e4a81b1bd0629cf1619498f
[INFO] building K-dash/bookshelf_library against master#11663cd3bfefef7d34e8f0892c250bf698049392+rustflags=-Dtail-expr-drop-order for pr-134523
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FK-dash%2Fbookshelf_library" "/workspace/builds/worker-7-tc1/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-7-tc1/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/K-dash/bookshelf_library on toolchain 11663cd3bfefef7d34e8f0892c250bf698049392
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+11663cd3bfefef7d34e8f0892c250bf698049392" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/K-dash/bookshelf_library
[INFO] finished tweaking git repo https://github.com/K-dash/bookshelf_library
[INFO] tweaked toml for git repo https://github.com/K-dash/bookshelf_library written to /workspace/builds/worker-7-tc1/source/Cargo.toml
[INFO] crate git repo https://github.com/K-dash/bookshelf_library 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" "+11663cd3bfefef7d34e8f0892c250bf698049392" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-7-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-7-tc1/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:f3a9d4ad9d972b27faf3965f35b62e55ba32bbce8f20bc8fe909558a86702fde" "/opt/rustwide/cargo-home/bin/cargo" "+11663cd3bfefef7d34e8f0892c250bf698049392" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 7b75daa14dbb6ff435e15fa42f980b1c1435a4fbebf4df308836b7fc69631273
[INFO] running `Command { std: "docker" "start" "-a" "7b75daa14dbb6ff435e15fa42f980b1c1435a4fbebf4df308836b7fc69631273", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "7b75daa14dbb6ff435e15fa42f980b1c1435a4fbebf4df308836b7fc69631273", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "7b75daa14dbb6ff435e15fa42f980b1c1435a4fbebf4df308836b7fc69631273", kill_on_drop: false }`
[INFO] [stdout] 7b75daa14dbb6ff435e15fa42f980b1c1435a4fbebf4df308836b7fc69631273
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-7-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-7-tc1/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 -Dtail-expr-drop-order" "-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:f3a9d4ad9d972b27faf3965f35b62e55ba32bbce8f20bc8fe909558a86702fde" "/opt/rustwide/cargo-home/bin/cargo" "+11663cd3bfefef7d34e8f0892c250bf698049392" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] acfb1b05bec7cbf22812a9f534a365c5be8ccbc34df80a1a3003a693a95ec3f1
[INFO] running `Command { std: "docker" "start" "-a" "acfb1b05bec7cbf22812a9f534a365c5be8ccbc34df80a1a3003a693a95ec3f1", kill_on_drop: false }`
[INFO] [stderr]    Compiling thread_local v1.1.8
[INFO] [stderr]    Compiling fuzzy-matcher v0.3.7
[INFO] [stderr]    Compiling my_library v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: unused variable: `book`
[INFO] [stdout]   --> src/library/bookshelf.rs:36:35
[INFO] [stdout]    |
[INFO] [stdout] 36 |     pub fn remove_book(&mut self, book: &Book) -> Option<Book> {
[INFO] [stdout]    |                                   ^^^^ help: if this is intentional, prefix it with an underscore: `_book`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `shelf`
[INFO] [stdout]  --> src/lib.rs:4:9
[INFO] [stdout]   |
[INFO] [stdout] 4 |     let shelf = crate::library::bookshelf::Bookshelf::default();
[INFO] [stdout]   |         ^^^^^ help: if this is intentional, prefix it with an underscore: `_shelf`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `shelf`
[INFO] [stdout]  --> src/lib.rs:9:9
[INFO] [stdout]   |
[INFO] [stdout] 9 |     let shelf = bookshelf::Bookshelf::default();
[INFO] [stdout]   |         ^^^^^ help: if this is intentional, prefix it with an underscore: `_shelf`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `function_1` is never used
[INFO] [stdout]  --> src/lib.rs:3:4
[INFO] [stdout]   |
[INFO] [stdout] 3 | fn function_1() {
[INFO] [stdout]   |    ^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `function_2` is never used
[INFO] [stdout]  --> src/lib.rs:7:4
[INFO] [stdout]   |
[INFO] [stdout] 7 | fn function_2() {
[INFO] [stdout]   |    ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished `dev` profile [unoptimized + debuginfo] target(s) in 0.45s
[INFO] running `Command { std: "docker" "inspect" "acfb1b05bec7cbf22812a9f534a365c5be8ccbc34df80a1a3003a693a95ec3f1", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "acfb1b05bec7cbf22812a9f534a365c5be8ccbc34df80a1a3003a693a95ec3f1", kill_on_drop: false }`
[INFO] [stdout] acfb1b05bec7cbf22812a9f534a365c5be8ccbc34df80a1a3003a693a95ec3f1
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-7-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-7-tc1/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 -Dtail-expr-drop-order" "-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:f3a9d4ad9d972b27faf3965f35b62e55ba32bbce8f20bc8fe909558a86702fde" "/opt/rustwide/cargo-home/bin/cargo" "+11663cd3bfefef7d34e8f0892c250bf698049392" "test" "--frozen" "--no-run" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 57f630c80588a0df7b15e09201415965a19b33e922b32eb59e829d1f8714cfaf
[INFO] running `Command { std: "docker" "start" "-a" "57f630c80588a0df7b15e09201415965a19b33e922b32eb59e829d1f8714cfaf", kill_on_drop: false }`
[INFO] [stdout] warning: unused variable: `book`
[INFO] [stdout]   --> src/library/bookshelf.rs:36:35
[INFO] [stdout]    |
[INFO] [stdout] 36 |     pub fn remove_book(&mut self, book: &Book) -> Option<Book> {
[INFO] [stdout]    |                                   ^^^^ help: if this is intentional, prefix it with an underscore: `_book`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `shelf`
[INFO] [stdout]  --> src/lib.rs:4:9
[INFO] [stdout]   |
[INFO] [stdout] 4 |     let shelf = crate::library::bookshelf::Bookshelf::default();
[INFO] [stdout]   |         ^^^^^ help: if this is intentional, prefix it with an underscore: `_shelf`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `shelf`
[INFO] [stdout]  --> src/lib.rs:9:9
[INFO] [stdout]   |
[INFO] [stdout] 9 |     let shelf = bookshelf::Bookshelf::default();
[INFO] [stdout]   |         ^^^^^ help: if this is intentional, prefix it with an underscore: `_shelf`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `function_1` is never used
[INFO] [stdout]  --> src/lib.rs:3:4
[INFO] [stdout]   |
[INFO] [stdout] 3 | fn function_1() {
[INFO] [stdout]   |    ^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `function_2` is never used
[INFO] [stdout]  --> src/lib.rs:7:4
[INFO] [stdout]   |
[INFO] [stdout] 7 | fn function_2() {
[INFO] [stdout]   |    ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]    Compiling my_library v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: unused variable: `book`
[INFO] [stdout]   --> src/library/bookshelf.rs:36:35
[INFO] [stdout]    |
[INFO] [stdout] 36 |     pub fn remove_book(&mut self, book: &Book) -> Option<Book> {
[INFO] [stdout]    |                                   ^^^^ help: if this is intentional, prefix it with an underscore: `_book`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `shelf`
[INFO] [stdout]  --> src/lib.rs:4:9
[INFO] [stdout]   |
[INFO] [stdout] 4 |     let shelf = crate::library::bookshelf::Bookshelf::default();
[INFO] [stdout]   |         ^^^^^ help: if this is intentional, prefix it with an underscore: `_shelf`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `shelf`
[INFO] [stdout]  --> src/lib.rs:9:9
[INFO] [stdout]   |
[INFO] [stdout] 9 |     let shelf = bookshelf::Bookshelf::default();
[INFO] [stdout]   |         ^^^^^ help: if this is intentional, prefix it with an underscore: `_shelf`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `function_1` is never used
[INFO] [stdout]  --> src/lib.rs:3:4
[INFO] [stdout]   |
[INFO] [stdout] 3 | fn function_1() {
[INFO] [stdout]   |    ^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `function_2` is never used
[INFO] [stdout]  --> src/lib.rs:7:4
[INFO] [stdout]   |
[INFO] [stdout] 7 | fn function_2() {
[INFO] [stdout]   |    ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished `test` profile [unoptimized + debuginfo] target(s) in 0.14s
[INFO] running `Command { std: "docker" "inspect" "57f630c80588a0df7b15e09201415965a19b33e922b32eb59e829d1f8714cfaf", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "57f630c80588a0df7b15e09201415965a19b33e922b32eb59e829d1f8714cfaf", kill_on_drop: false }`
[INFO] [stdout] 57f630c80588a0df7b15e09201415965a19b33e922b32eb59e829d1f8714cfaf