[INFO] fetching crate math_test 1.0.0...
[INFO] checking math_test-1.0.0 against try#c659ee110de67e82444e4b6c8407c1a9af9c2cf6 for pr-145608-1
[INFO] extracting crate math_test 1.0.0 into /workspace/builds/worker-4-tc2/source
[INFO] started tweaking crates.io crate math_test 1.0.0
[INFO] finished tweaking crates.io crate math_test 1.0.0
[INFO] tweaked toml for crates.io crate math_test 1.0.0 written to /workspace/builds/worker-4-tc2/source/Cargo.toml
[INFO] validating manifest of crates.io crate math_test 1.0.0 on toolchain c659ee110de67e82444e4b6c8407c1a9af9c2cf6
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+c659ee110de67e82444e4b6c8407c1a9af9c2cf6" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] crate crates.io crate math_test 1.0.0 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" "+c659ee110de67e82444e4b6c8407c1a9af9c2cf6" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[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@sha256:7ad1b28ee6f5f7f699f6cf7015098d6ccdd96d6f2d78dd06228f5b4c9faf309c" "/opt/rustwide/cargo-home/bin/cargo" "+c659ee110de67e82444e4b6c8407c1a9af9c2cf6" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 3d1283eaefbedaad9e681ff6132e9714725cc184136fc607bb4f6e0ce2043ee6
[INFO] running `Command { std: "docker" "start" "-a" "3d1283eaefbedaad9e681ff6132e9714725cc184136fc607bb4f6e0ce2043ee6", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "3d1283eaefbedaad9e681ff6132e9714725cc184136fc607bb4f6e0ce2043ee6", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "3d1283eaefbedaad9e681ff6132e9714725cc184136fc607bb4f6e0ce2043ee6", kill_on_drop: false }`
[INFO] [stdout] 3d1283eaefbedaad9e681ff6132e9714725cc184136fc607bb4f6e0ce2043ee6
[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@sha256:7ad1b28ee6f5f7f699f6cf7015098d6ccdd96d6f2d78dd06228f5b4c9faf309c" "/opt/rustwide/cargo-home/bin/cargo" "+c659ee110de67e82444e4b6c8407c1a9af9c2cf6" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] ca5618c2279bb860a6ff57935dfa3d5c6b6053f9bfb312953f34f2d51d030a50
[INFO] running `Command { std: "docker" "start" "-a" "ca5618c2279bb860a6ff57935dfa3d5c6b6053f9bfb312953f34f2d51d030a50", kill_on_drop: false }`
[INFO] [stderr]    Compiling libc v0.2.129
[INFO] [stderr]    Compiling num-traits v0.2.15
[INFO] [stderr]     Checking encoding_index_tests v0.1.4
[INFO] [stderr]    Compiling syn v1.0.99
[INFO] [stderr]    Compiling standback v0.2.17
[INFO] [stderr]    Compiling num-integer v0.1.45
[INFO] [stderr]    Compiling const_fn v0.4.9
[INFO] [stderr]    Compiling time v0.2.27
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[INFO] [stderr]    Compiling time-macros-impl v0.1.2
[INFO] [stderr]    Compiling derive_more v0.99.17
[INFO] [stderr]     Checking time-macros v0.1.1
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[INFO] [stderr]     Checking printpdf v0.3.4
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[INFO] [stderr]     Checking math_test v1.0.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: trait `Equation` is never used
[INFO] [stdout]  --> src/equation/mod.rs:6:11
[INFO] [stdout]   |
[INFO] [stdout] 6 | pub trait Equation: Question {
[INFO] [stdout]   |           ^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `OneVariable` is never constructed
[INFO] [stdout]   --> src/equation/onevariable/mod.rs:12:12
[INFO] [stdout]    |
[INFO] [stdout] 12 | pub struct OneVariable {
[INFO] [stdout]    |            ^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `TwoVariables` is never constructed
[INFO] [stdout]   --> src/equation/twovariables/mod.rs:10:12
[INFO] [stdout]    |
[INFO] [stdout] 10 | pub struct TwoVariables {
[INFO] [stdout]    |            ^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `Operation` is never constructed
[INFO] [stdout]   --> src/operation/mod.rs:11:12
[INFO] [stdout]    |
[INFO] [stdout] 11 | pub struct Operation {
[INFO] [stdout]    |            ^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function `choose_variable` is never used
[INFO] [stdout]   --> src/operation/mod.rs:18:8
[INFO] [stdout]    |
[INFO] [stdout] 17 | impl Operation {
[INFO] [stdout]    | -------------- associated function in this implementation
[INFO] [stdout] 18 |     fn choose_variable(min: i32, max: i32) -> i32 {
[INFO] [stdout]    |        ^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: method `panic` is never used
[INFO] [stdout]    --> src/operation/mod.rs:137:12
[INFO] [stdout]     |
[INFO] [stdout] 136 | impl Operation {
[INFO] [stdout]     | -------------- method in this implementation
[INFO] [stdout] 137 |     pub fn panic(&self, e: &str) {
[INFO] [stdout]     |            ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated items `get_correct_answer`, `calculate`, `read_answer_from_cmd`, and `verify_answer` are never used
[INFO] [stdout]   --> src/question.rs:10:8
[INFO] [stdout]    |
[INFO] [stdout]  6 | pub trait Question: Display {
[INFO] [stdout]    |           -------- associated items in this trait
[INFO] [stdout] ...
[INFO] [stdout] 10 |     fn get_correct_answer(&self) -> Self::Output;
[INFO] [stdout]    |        ^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 11 |     fn calculate(&self) -> Self::Output;
[INFO] [stdout]    |        ^^^^^^^^^
[INFO] [stdout] 12 |     fn post_to_cmd(&self) -> bool;
[INFO] [stdout] 13 |     fn read_answer_from_cmd() -> Self::Output;
[INFO] [stdout]    |        ^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 14 |     fn correct_answer_to_string(&self) -> String;
[INFO] [stdout] 15 |     fn verify_answer(correct_answer: Self::Output, answer: Self::Output) -> bool {
[INFO] [stdout]    |        ^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished `dev` profile [unoptimized + debuginfo] target(s) in 7.60s
[INFO] running `Command { std: "docker" "inspect" "ca5618c2279bb860a6ff57935dfa3d5c6b6053f9bfb312953f34f2d51d030a50", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "ca5618c2279bb860a6ff57935dfa3d5c6b6053f9bfb312953f34f2d51d030a50", kill_on_drop: false }`
[INFO] [stdout] ca5618c2279bb860a6ff57935dfa3d5c6b6053f9bfb312953f34f2d51d030a50