[INFO] cloning repository https://github.com/gabrielfonte/rust-course
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/gabrielfonte/rust-course" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fgabrielfonte%2Frust-course", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fgabrielfonte%2Frust-course'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] ab4fe98366b05101aad66acabb103b42c5e75648
[INFO] building gabrielfonte/rust-course 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%2Fgabrielfonte%2Frust-course" "/workspace/builds/worker-6-tc1/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-6-tc1/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/gabrielfonte/rust-course 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/gabrielfonte/rust-course
[INFO] finished tweaking git repo https://github.com/gabrielfonte/rust-course
[INFO] tweaked toml for git repo https://github.com/gabrielfonte/rust-course written to /workspace/builds/worker-6-tc1/source/Cargo.toml
[INFO] crate git repo https://github.com/gabrielfonte/rust-course 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] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]  Downloading crates ...
[INFO] [stderr]   Downloaded rand_core v0.9.0-alpha.0
[INFO] [stderr]   Downloaded zerocopy-derive v0.8.0-alpha.5
[INFO] [stderr]   Downloaded rand_chacha v0.9.0-alpha.0
[INFO] [stderr]   Downloaded rand v0.9.0-alpha.0
[INFO] [stderr]   Downloaded zerocopy v0.8.0-alpha.5
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-6-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-6-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] f9cb0538032a32257c4b91f9c74930c03dcbcb21202f92079465f250f19604d7
[INFO] running `Command { std: "docker" "start" "-a" "f9cb0538032a32257c4b91f9c74930c03dcbcb21202f92079465f250f19604d7", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "f9cb0538032a32257c4b91f9c74930c03dcbcb21202f92079465f250f19604d7", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "f9cb0538032a32257c4b91f9c74930c03dcbcb21202f92079465f250f19604d7", kill_on_drop: false }`
[INFO] [stdout] f9cb0538032a32257c4b91f9c74930c03dcbcb21202f92079465f250f19604d7
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-6-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-6-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] 1f7293572bd1a1576a93dbc28f31db50df4f45a2f91b6b7db101b53cdc52a571
[INFO] running `Command { std: "docker" "start" "-a" "1f7293572bd1a1576a93dbc28f31db50df4f45a2f91b6b7db101b53cdc52a571", kill_on_drop: false }`
[INFO] [stderr]    Compiling libc v0.2.153
[INFO] [stderr]    Compiling zerocopy v0.8.0-alpha.5
[INFO] [stderr]    Compiling ppv-lite86 v0.2.17
[INFO] [stderr]    Compiling getrandom v0.2.12
[INFO] [stderr]    Compiling rand_core v0.9.0-alpha.0
[INFO] [stderr]    Compiling rand_chacha v0.9.0-alpha.0
[INFO] [stderr]    Compiling rand v0.9.0-alpha.0
[INFO] [stderr]    Compiling rust_course v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: unused import: `std::mem::size_of`
[INFO] [stdout]  --> src/module3_types.rs:1:5
[INFO] [stdout]   |
[INFO] [stdout] 1 | use std::mem::size_of;
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unnecessary trailing semicolon
[INFO] [stdout]   --> src/module3_types.rs:63:6
[INFO] [stdout]    |
[INFO] [stdout] 63 |     };
[INFO] [stdout]    |      ^ help: remove this semicolon
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(redundant_semicolons)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `chip_proportion`
[INFO] [stdout]    --> src/module4_logic.rs:195:30
[INFO] [stdout]     |
[INFO] [stdout] 195 |         Meal::FishAndChips { chip_proportion } => {
[INFO] [stdout]     |                              ^^^^^^^^^^^^^^^ help: try ignoring the field: `chip_proportion: _`
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable `x` is assigned to, but never used
[INFO] [stdout]    --> src/module4_logic.rs:316:9
[INFO] [stdout]     |
[INFO] [stdout] 316 |     let x;
[INFO] [stdout]     |         ^
[INFO] [stdout]     |
[INFO] [stdout]     = note: consider using `_x` instead
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: value assigned to `x` is never read
[INFO] [stdout]    --> src/module4_logic.rs:319:9
[INFO] [stdout]     |
[INFO] [stdout] 319 |         x = 3;
[INFO] [stdout]     |         ^
[INFO] [stdout]     |
[INFO] [stdout]     = help: maybe it is overwritten before being read?
[INFO] [stdout]     = note: `#[warn(unused_assignments)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `y`
[INFO] [stdout]    --> src/module4_logic.rs:323:9
[INFO] [stdout]     |
[INFO] [stdout] 323 |     let y = {
[INFO] [stdout]     |         ^ help: if this is intentional, prefix it with an underscore: `_y`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variants `North`, `South`, and `West` are never constructed
[INFO] [stdout]   --> src/module3_types.rs:78:9
[INFO] [stdout]    |
[INFO] [stdout] 77 |     enum CardinalDirection {
[INFO] [stdout]    |          ----------------- variants in this enum
[INFO] [stdout] 78 |         North,
[INFO] [stdout]    |         ^^^^^
[INFO] [stdout] 79 |         East,
[INFO] [stdout] 80 |         South,
[INFO] [stdout]    |         ^^^^^
[INFO] [stdout] 81 |         West,
[INFO] [stdout]    |         ^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `CardinalDirection` has a derived impl for the trait `Debug`, but this is intentionally ignored during dead code analysis
[INFO] [stdout]    = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variants `Square` and `Circle` are never constructed
[INFO] [stdout]   --> src/module3_types.rs:88:9
[INFO] [stdout]    |
[INFO] [stdout] 87 |     enum Shape {
[INFO] [stdout]    |          ----- variants in this enum
[INFO] [stdout] 88 |         Square {
[INFO] [stdout]    |         ^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 95 |         Circle {
[INFO] [stdout]    |         ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field `likes_brownies` is never read
[INFO] [stdout]   --> src/module4_logic.rs:17:9
[INFO] [stdout]    |
[INFO] [stdout] 14 |     struct Person {
[INFO] [stdout]    |            ------ field in this struct
[INFO] [stdout] ...
[INFO] [stdout] 17 |         likes_brownies: bool,
[INFO] [stdout]    |         ^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `u32_add_alternative` is never used
[INFO] [stdout]    --> src/module4_logic.rs:353:8
[INFO] [stdout]     |
[INFO] [stdout] 353 |     fn u32_add_alternative(a: u32, b: u32) -> u32 {
[INFO] [stdout]     |        ^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished `dev` profile [unoptimized + debuginfo] target(s) in 3.65s
[INFO] running `Command { std: "docker" "inspect" "1f7293572bd1a1576a93dbc28f31db50df4f45a2f91b6b7db101b53cdc52a571", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "1f7293572bd1a1576a93dbc28f31db50df4f45a2f91b6b7db101b53cdc52a571", kill_on_drop: false }`
[INFO] [stdout] 1f7293572bd1a1576a93dbc28f31db50df4f45a2f91b6b7db101b53cdc52a571
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-6-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-6-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] 3cf00fa5c513bbd8f46056482a289e1af8430ab345ee4da34897195f523bc7d2
[INFO] running `Command { std: "docker" "start" "-a" "3cf00fa5c513bbd8f46056482a289e1af8430ab345ee4da34897195f523bc7d2", kill_on_drop: false }`
[INFO] [stderr]    Compiling rust_course v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: unused import: `std::mem::size_of`
[INFO] [stdout]  --> src/module3_types.rs:1:5
[INFO] [stdout]   |
[INFO] [stdout] 1 | use std::mem::size_of;
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unnecessary trailing semicolon
[INFO] [stdout]   --> src/module3_types.rs:63:6
[INFO] [stdout]    |
[INFO] [stdout] 63 |     };
[INFO] [stdout]    |      ^ help: remove this semicolon
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(redundant_semicolons)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `chip_proportion`
[INFO] [stdout]    --> src/module4_logic.rs:195:30
[INFO] [stdout]     |
[INFO] [stdout] 195 |         Meal::FishAndChips { chip_proportion } => {
[INFO] [stdout]     |                              ^^^^^^^^^^^^^^^ help: try ignoring the field: `chip_proportion: _`
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable `x` is assigned to, but never used
[INFO] [stdout]    --> src/module4_logic.rs:316:9
[INFO] [stdout]     |
[INFO] [stdout] 316 |     let x;
[INFO] [stdout]     |         ^
[INFO] [stdout]     |
[INFO] [stdout]     = note: consider using `_x` instead
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: value assigned to `x` is never read
[INFO] [stdout]    --> src/module4_logic.rs:319:9
[INFO] [stdout]     |
[INFO] [stdout] 319 |         x = 3;
[INFO] [stdout]     |         ^
[INFO] [stdout]     |
[INFO] [stdout]     = help: maybe it is overwritten before being read?
[INFO] [stdout]     = note: `#[warn(unused_assignments)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `y`
[INFO] [stdout]    --> src/module4_logic.rs:323:9
[INFO] [stdout]     |
[INFO] [stdout] 323 |     let y = {
[INFO] [stdout]     |         ^ help: if this is intentional, prefix it with an underscore: `_y`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variants `North`, `South`, and `West` are never constructed
[INFO] [stdout]   --> src/module3_types.rs:78:9
[INFO] [stdout]    |
[INFO] [stdout] 77 |     enum CardinalDirection {
[INFO] [stdout]    |          ----------------- variants in this enum
[INFO] [stdout] 78 |         North,
[INFO] [stdout]    |         ^^^^^
[INFO] [stdout] 79 |         East,
[INFO] [stdout] 80 |         South,
[INFO] [stdout]    |         ^^^^^
[INFO] [stdout] 81 |         West,
[INFO] [stdout]    |         ^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `CardinalDirection` has a derived impl for the trait `Debug`, but this is intentionally ignored during dead code analysis
[INFO] [stdout]    = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variants `Square` and `Circle` are never constructed
[INFO] [stdout]   --> src/module3_types.rs:88:9
[INFO] [stdout]    |
[INFO] [stdout] 87 |     enum Shape {
[INFO] [stdout]    |          ----- variants in this enum
[INFO] [stdout] 88 |         Square {
[INFO] [stdout]    |         ^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 95 |         Circle {
[INFO] [stdout]    |         ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field `likes_brownies` is never read
[INFO] [stdout]   --> src/module4_logic.rs:17:9
[INFO] [stdout]    |
[INFO] [stdout] 14 |     struct Person {
[INFO] [stdout]    |            ------ field in this struct
[INFO] [stdout] ...
[INFO] [stdout] 17 |         likes_brownies: bool,
[INFO] [stdout]    |         ^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `u32_add_alternative` is never used
[INFO] [stdout]    --> src/module4_logic.rs:353:8
[INFO] [stdout]     |
[INFO] [stdout] 353 |     fn u32_add_alternative(a: u32, b: u32) -> u32 {
[INFO] [stdout]     |        ^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished `test` profile [unoptimized + debuginfo] target(s) in 0.51s
[INFO] running `Command { std: "docker" "inspect" "3cf00fa5c513bbd8f46056482a289e1af8430ab345ee4da34897195f523bc7d2", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "3cf00fa5c513bbd8f46056482a289e1af8430ab345ee4da34897195f523bc7d2", kill_on_drop: false }`
[INFO] [stdout] 3cf00fa5c513bbd8f46056482a289e1af8430ab345ee4da34897195f523bc7d2