[INFO] cloning repository https://github.com/Milo-Shen/The-Rustonomicon
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/Milo-Shen/The-Rustonomicon" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FMilo-Shen%2FThe-Rustonomicon", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FMilo-Shen%2FThe-Rustonomicon'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 8b1f322dba058183236fa8e9ce445245abca0a9b
[INFO] checking Milo-Shen/The-Rustonomicon against try#4f260f0f20b3133d20cfb50353c0221943af5796+rustflags=-Dunmustuse_in_always_ok for pr-148577
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FMilo-Shen%2FThe-Rustonomicon" "/workspace/builds/worker-3-tc2/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-3-tc2/source'...
[INFO] [stderr] done.
[INFO] started tweaking git repo https://github.com/Milo-Shen/The-Rustonomicon
[INFO] finished tweaking git repo https://github.com/Milo-Shen/The-Rustonomicon
[INFO] tweaked toml for git repo https://github.com/Milo-Shen/The-Rustonomicon written to /workspace/builds/worker-3-tc2/source/Cargo.toml
[INFO] validating manifest of git repo https://github.com/Milo-Shen/The-Rustonomicon on toolchain 4f260f0f20b3133d20cfb50353c0221943af5796
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+4f260f0f20b3133d20cfb50353c0221943af5796" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] crate git repo https://github.com/Milo-Shen/The-Rustonomicon 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" "+4f260f0f20b3133d20cfb50353c0221943af5796" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-3-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-3-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@sha256:4848fb76d95f26979359cc7e45710b1dbc8f3acb7aeedee7c460d7702230f228" "/opt/rustwide/cargo-home/bin/cargo" "+4f260f0f20b3133d20cfb50353c0221943af5796" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] a296543991c9811d9747f7f194bb4e6ec067146068ef29214b5ca2d80d346c95
[INFO] running `Command { std: "docker" "start" "-a" "a296543991c9811d9747f7f194bb4e6ec067146068ef29214b5ca2d80d346c95", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "a296543991c9811d9747f7f194bb4e6ec067146068ef29214b5ca2d80d346c95", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "a296543991c9811d9747f7f194bb4e6ec067146068ef29214b5ca2d80d346c95", kill_on_drop: false }`
[INFO] [stdout] a296543991c9811d9747f7f194bb4e6ec067146068ef29214b5ca2d80d346c95
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-3-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-3-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 -Dunmustuse_in_always_ok" "-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@sha256:4848fb76d95f26979359cc7e45710b1dbc8f3acb7aeedee7c460d7702230f228" "/opt/rustwide/cargo-home/bin/cargo" "+4f260f0f20b3133d20cfb50353c0221943af5796" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] f393a738552cd2f9a0532a2972d42f8739e1f6b4c59278d0ce868e84e1094117
[INFO] running `Command { std: "docker" "start" "-a" "f393a738552cd2f9a0532a2972d42f8739e1f6b4c59278d0ce868e84e1094117", kill_on_drop: false }`
[INFO] [stderr]     Checking rustonomicon v1.0.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: unused variable: `res`
[INFO] [stdout]    --> src/chapter_2.rs:153:9
[INFO] [stdout]     |
[INFO] [stdout] 153 |     let res: Result<u32, Void> = Ok(0);
[INFO] [stdout]     |         ^^^ help: if this is intentional, prefix it with an underscore: `_res`
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unused_variables)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variants `A`, `B`, and `C` are never constructed
[INFO] [stdout]   --> src/chapter_1.rs:31:5
[INFO] [stdout]    |
[INFO] [stdout] 30 | enum Foo {
[INFO] [stdout]    |      --- variants in this enum
[INFO] [stdout] 31 |     A(u32),
[INFO] [stdout]    |     ^
[INFO] [stdout] 32 |     B(u64),
[INFO] [stdout]    |     ^
[INFO] [stdout] 33 |     C(u8),
[INFO] [stdout]    |     ^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(dead_code)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: fields `a`, `b`, and `c` are never read
[INFO] [stdout]   --> src/chapter_1.rs:49:5
[INFO] [stdout]    |
[INFO] [stdout] 48 | struct A {
[INFO] [stdout]    |        - fields in this struct
[INFO] [stdout] 49 |     a: u8,
[INFO] [stdout]    |     ^
[INFO] [stdout] 50 |     b: u32,
[INFO] [stdout]    |     ^
[INFO] [stdout] 51 |     c: u16,
[INFO] [stdout]    |     ^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: fields `a`, `b`, and `c` are never read
[INFO] [stdout]   --> src/chapter_1.rs:55:5
[INFO] [stdout]    |
[INFO] [stdout] 54 | struct B {
[INFO] [stdout]    |        - fields in this struct
[INFO] [stdout] 55 |     a: u8,
[INFO] [stdout]    |     ^
[INFO] [stdout] 56 |     b: u32,
[INFO] [stdout]    |     ^
[INFO] [stdout] 57 |     c: u16,
[INFO] [stdout]    |     ^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait `MyTrait` is never used
[INFO] [stdout]   --> src/chapter_2.rs:36:7
[INFO] [stdout]    |
[INFO] [stdout] 36 | trait MyTrait {
[INFO] [stdout]    |       ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `MySuperSlice` is never constructed
[INFO] [stdout]   --> src/chapter_2.rs:65:12
[INFO] [stdout]    |
[INFO] [stdout] 65 |     struct MySuperSlice {
[INFO] [stdout]    |            ^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `LotsOfNothing` is never constructed
[INFO] [stdout]    --> src/chapter_2.rs:100:8
[INFO] [stdout]     |
[INFO] [stdout] 100 | struct LotsOfNothing {
[INFO] [stdout]     |        ^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: enum `Void` is never used
[INFO] [stdout]    --> src/chapter_2.rs:143:6
[INFO] [stdout]     |
[INFO] [stdout] 143 | enum Void {} // 没有变体的类型 = 空类型
[INFO] [stdout]     |      ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `et` is never used
[INFO] [stdout]    --> src/chapter_2.rs:150:8
[INFO] [stdout]     |
[INFO] [stdout] 150 | pub fn et() {
[INFO] [stdout]     |        ^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: enum `MyOption` is never used
[INFO] [stdout]   --> src/chapter_3.rs:37:6
[INFO] [stdout]    |
[INFO] [stdout] 37 | enum MyOption<T> {
[INFO] [stdout]    |      ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: enum `MyReprOption` is never used
[INFO] [stdout]   --> src/chapter_3.rs:43:6
[INFO] [stdout]    |
[INFO] [stdout] 43 | enum MyReprOption<T> {
[INFO] [stdout]    |      ^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: enum `MyType` is never used
[INFO] [stdout]   --> src/chapter_3.rs:83:10
[INFO] [stdout]    |
[INFO] [stdout] 83 |     enum MyType {
[INFO] [stdout]    |          ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: this type will no longer be must used: Result<u32, et::Void>
[INFO] [stdout]    --> src/chapter_2.rs:153:34
[INFO] [stdout]     |
[INFO] [stdout] 153 |     let res: Result<u32, Void> = Ok(0);
[INFO] [stdout]     |                                  ^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: requested on the command line with `-D unmustuse-in-always-ok`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `rustonomicon` (bin "rustonomicon") due to 1 previous error; 12 warnings emitted
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[INFO] [stdout] warning: unused variable: `res`
[INFO] [stdout]    --> src/chapter_2.rs:153:9
[INFO] [stdout]     |
[INFO] [stdout] 153 |     let res: Result<u32, Void> = Ok(0);
[INFO] [stdout]     |         ^^^ help: if this is intentional, prefix it with an underscore: `_res`
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unused_variables)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variants `A`, `B`, and `C` are never constructed
[INFO] [stdout]   --> src/chapter_1.rs:31:5
[INFO] [stdout]    |
[INFO] [stdout] 30 | enum Foo {
[INFO] [stdout]    |      --- variants in this enum
[INFO] [stdout] 31 |     A(u32),
[INFO] [stdout]    |     ^
[INFO] [stdout] 32 |     B(u64),
[INFO] [stdout]    |     ^
[INFO] [stdout] 33 |     C(u8),
[INFO] [stdout]    |     ^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(dead_code)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: fields `a`, `b`, and `c` are never read
[INFO] [stdout]   --> src/chapter_1.rs:49:5
[INFO] [stdout]    |
[INFO] [stdout] 48 | struct A {
[INFO] [stdout]    |        - fields in this struct
[INFO] [stdout] 49 |     a: u8,
[INFO] [stdout]    |     ^
[INFO] [stdout] 50 |     b: u32,
[INFO] [stdout]    |     ^
[INFO] [stdout] 51 |     c: u16,
[INFO] [stdout]    |     ^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: fields `a`, `b`, and `c` are never read
[INFO] [stdout]   --> src/chapter_1.rs:55:5
[INFO] [stdout]    |
[INFO] [stdout] 54 | struct B {
[INFO] [stdout]    |        - fields in this struct
[INFO] [stdout] 55 |     a: u8,
[INFO] [stdout]    |     ^
[INFO] [stdout] 56 |     b: u32,
[INFO] [stdout]    |     ^
[INFO] [stdout] 57 |     c: u16,
[INFO] [stdout]    |     ^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait `MyTrait` is never used
[INFO] [stdout]   --> src/chapter_2.rs:36:7
[INFO] [stdout]    |
[INFO] [stdout] 36 | trait MyTrait {
[INFO] [stdout]    |       ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `MySuperSlice` is never constructed
[INFO] [stdout]   --> src/chapter_2.rs:65:12
[INFO] [stdout]    |
[INFO] [stdout] 65 |     struct MySuperSlice {
[INFO] [stdout]    |            ^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `LotsOfNothing` is never constructed
[INFO] [stdout]    --> src/chapter_2.rs:100:8
[INFO] [stdout]     |
[INFO] [stdout] 100 | struct LotsOfNothing {
[INFO] [stdout]     |        ^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: enum `Void` is never used
[INFO] [stdout]    --> src/chapter_2.rs:143:6
[INFO] [stdout]     |
[INFO] [stdout] 143 | enum Void {} // 没有变体的类型 = 空类型
[INFO] [stdout]     |      ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `et` is never used
[INFO] [stdout]    --> src/chapter_2.rs:150:8
[INFO] [stdout]     |
[INFO] [stdout] 150 | pub fn et() {
[INFO] [stdout]     |        ^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: enum `MyOption` is never used
[INFO] [stdout]   --> src/chapter_3.rs:37:6
[INFO] [stdout]    |
[INFO] [stdout] 37 | enum MyOption<T> {
[INFO] [stdout]    |      ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: enum `MyReprOption` is never used
[INFO] [stdout]   --> src/chapter_3.rs:43:6
[INFO] [stdout]    |
[INFO] [stdout] 43 | enum MyReprOption<T> {
[INFO] [stdout]    |      ^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: enum `MyType` is never used
[INFO] [stdout]   --> src/chapter_3.rs:83:10
[INFO] [stdout]    |
[INFO] [stdout] 83 |     enum MyType {
[INFO] [stdout]    |          ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: this type will no longer be must used: Result<u32, et::Void>
[INFO] [stdout]    --> src/chapter_2.rs:153:34
[INFO] [stdout]     |
[INFO] [stdout] 153 |     let res: Result<u32, Void> = Ok(0);
[INFO] [stdout]     |                                  ^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: requested on the command line with `-D unmustuse-in-always-ok`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `rustonomicon` (bin "rustonomicon" test) due to 1 previous error; 12 warnings emitted
[INFO] running `Command { std: "docker" "inspect" "f393a738552cd2f9a0532a2972d42f8739e1f6b4c59278d0ce868e84e1094117", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "f393a738552cd2f9a0532a2972d42f8739e1f6b4c59278d0ce868e84e1094117", kill_on_drop: false }`
[INFO] [stdout] f393a738552cd2f9a0532a2972d42f8739e1f6b4c59278d0ce868e84e1094117