[INFO] cloning repository https://github.com/initinll-rust/learning-generics-traits-lifetimes
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[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Finitinll-rust%2Flearning-generics-traits-lifetimes" "/workspace/builds/worker-3-tc1/source", kill_on_drop: false }`
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[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/initinll-rust/learning-generics-traits-lifetimes on toolchain ecb170afc878648c3ae355dbd596c8e4b6f7ebdc
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[INFO] finished tweaking git repo https://github.com/initinll-rust/learning-generics-traits-lifetimes
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[INFO] crate git repo https://github.com/initinll-rust/learning-generics-traits-lifetimes already has a lockfile, it will not be regenerated
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[INFO] [stdout] 10753a5e3b87ddf02edd5d882567166c1707018108a8c479ed45cd45a9b701a7
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[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-3-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-3-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" "-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@sha256:4b26683ee3c49f365255c425c23003cbf4366de097804722c29c5bbbee3624d2" "/opt/rustwide/cargo-home/bin/cargo" "+ecb170afc878648c3ae355dbd596c8e4b6f7ebdc" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 39bd2f55ede52a48f8ef477b5a62d42c9d795b806e53618362fae3b017e884ab
[INFO] running `Command { std: "docker" "start" "-a" "39bd2f55ede52a48f8ef477b5a62d42c9d795b806e53618362fae3b017e884ab", kill_on_drop: false }`
[INFO] [stderr]     Checking learning-generics-traits-lifetimes v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: unused variable: `t`
[INFO] [stdout]   --> src/concepts/traits.rs:72:57
[INFO] [stdout]    |
[INFO] [stdout] 72 | fn some_function1<T: Display + Clone, U: Clone + Debug>(t: &T, u: &U) -> () {    
[INFO] [stdout]    |                                                         ^ help: if this is intentional, prefix it with an underscore: `_t`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `u`
[INFO] [stdout]   --> src/concepts/traits.rs:72:64
[INFO] [stdout]    |
[INFO] [stdout] 72 | fn some_function1<T: Display + Clone, U: Clone + Debug>(t: &T, u: &U) -> () {    
[INFO] [stdout]    |                                                                ^ help: if this is intentional, prefix it with an underscore: `_u`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `t`
[INFO] [stdout]   --> src/concepts/traits.rs:75:25
[INFO] [stdout]    |
[INFO] [stdout] 75 | fn some_function2<T, U>(t: &T, u: &U) -> ()
[INFO] [stdout]    |                         ^ help: if this is intentional, prefix it with an underscore: `_t`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `u`
[INFO] [stdout]   --> src/concepts/traits.rs:75:32
[INFO] [stdout]    |
[INFO] [stdout] 75 | fn some_function2<T, U>(t: &T, u: &U) -> ()
[INFO] [stdout]    |                                ^ help: if this is intentional, prefix it with an underscore: `_u`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `t`
[INFO] [stdout]   --> src/concepts/traits.rs:72:57
[INFO] [stdout]    |
[INFO] [stdout] 72 | fn some_function1<T: Display + Clone, U: Clone + Debug>(t: &T, u: &U) -> () {    
[INFO] [stdout]    |                                                         ^ help: if this is intentional, prefix it with an underscore: `_t`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `u`
[INFO] [stdout]   --> src/concepts/traits.rs:72:64
[INFO] [stdout]    |
[INFO] [stdout] 72 | fn some_function1<T: Display + Clone, U: Clone + Debug>(t: &T, u: &U) -> () {    
[INFO] [stdout]    |                                                                ^ help: if this is intentional, prefix it with an underscore: `_u`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `t`
[INFO] [stdout]   --> src/concepts/traits.rs:75:25
[INFO] [stdout]    |
[INFO] [stdout] 75 | fn some_function2<T, U>(t: &T, u: &U) -> ()
[INFO] [stdout]    |                         ^ help: if this is intentional, prefix it with an underscore: `_t`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `u`
[INFO] [stdout]   --> src/concepts/traits.rs:75:32
[INFO] [stdout]    |
[INFO] [stdout] 75 | fn some_function2<T, U>(t: &T, u: &U) -> ()
[INFO] [stdout]    |                                ^ help: if this is intentional, prefix it with an underscore: `_u`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `t`
[INFO] [stdout]   --> src/main.rs:74:9
[INFO] [stdout]    |
[INFO] [stdout] 74 |     let t = returns_summarizable();
[INFO] [stdout]    |         ^ help: if this is intentional, prefix it with an underscore: `_t`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `t`
[INFO] [stdout]   --> src/main.rs:74:9
[INFO] [stdout]    |
[INFO] [stdout] 74 |     let t = returns_summarizable();
[INFO] [stdout]    |         ^ help: if this is intentional, prefix it with an underscore: `_t`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: fields `x` and `y` are never read
[INFO] [stdout]   --> src/concepts/generics.rs:44:9
[INFO] [stdout]    |
[INFO] [stdout] 43 | pub struct PointA<T, U> {
[INFO] [stdout]    |            ------ fields in this struct
[INFO] [stdout] 44 |     pub x: T,
[INFO] [stdout]    |         ^
[INFO] [stdout] 45 |     pub y: U,
[INFO] [stdout]    |         ^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `PointA` 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: fields `headline`, `author`, and `content` are never read
[INFO] [stdout]   --> src/concepts/traits.rs:14:9
[INFO] [stdout]    |
[INFO] [stdout] 13 | pub struct NewsArticle {
[INFO] [stdout]    |            ----------- fields in this struct
[INFO] [stdout] 14 |     pub headline: String,
[INFO] [stdout]    |         ^^^^^^^^
[INFO] [stdout] 15 |     pub location: String,
[INFO] [stdout] 16 |     pub author: String,
[INFO] [stdout]    |         ^^^^^^
[INFO] [stdout] 17 |     pub content: String
[INFO] [stdout]    |         ^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `NewsArticle` has a derived impl for the trait `Debug`, but this is intentionally ignored during dead code analysis
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: fields `content`, `reply`, and `retweet` are never read
[INFO] [stdout]   --> src/concepts/traits.rs:29:9
[INFO] [stdout]    |
[INFO] [stdout] 27 | pub struct Tweet {
[INFO] [stdout]    |            ----- fields in this struct
[INFO] [stdout] 28 |     pub username: String,
[INFO] [stdout] 29 |     pub content: String,
[INFO] [stdout]    |         ^^^^^^^
[INFO] [stdout] 30 |     pub reply: bool,
[INFO] [stdout]    |         ^^^^^
[INFO] [stdout] 31 |     pub retweet: bool
[INFO] [stdout]    |         ^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `Tweet` has a derived impl for the trait `Debug`, but this is intentionally ignored during dead code analysis
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `notify3` is never used
[INFO] [stdout]   --> src/concepts/traits.rs:52:8
[INFO] [stdout]    |
[INFO] [stdout] 52 | pub fn notify3(item1: &impl Summary, item2: &impl Summary) {
[INFO] [stdout]    |        ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `notify4` is never used
[INFO] [stdout]   --> src/concepts/traits.rs:57:8
[INFO] [stdout]    |
[INFO] [stdout] 57 | pub fn notify4<T: Summary>(item1: &T, item2: &T) {
[INFO] [stdout]    |        ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: fields `x` and `y` are never read
[INFO] [stdout]   --> src/concepts/generics.rs:44:9
[INFO] [stdout]    |
[INFO] [stdout] 43 | pub struct PointA<T, U> {
[INFO] [stdout]    |            ------ fields in this struct
[INFO] [stdout] 44 |     pub x: T,
[INFO] [stdout]    |         ^
[INFO] [stdout] 45 |     pub y: U,
[INFO] [stdout]    |         ^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `PointA` 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: function `notify5` is never used
[INFO] [stdout]   --> src/concepts/traits.rs:62:8
[INFO] [stdout]    |
[INFO] [stdout] 62 | pub fn notify5(item: &(impl Summary + Display)) {
[INFO] [stdout]    |        ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `notify6` is never used
[INFO] [stdout]   --> src/concepts/traits.rs:67:8
[INFO] [stdout]    |
[INFO] [stdout] 67 | pub fn notify6<T: Summary + Display>(item: &T) {
[INFO] [stdout]    |        ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: fields `headline`, `author`, and `content` are never read
[INFO] [stdout]   --> src/concepts/traits.rs:14:9
[INFO] [stdout]    |
[INFO] [stdout] 13 | pub struct NewsArticle {
[INFO] [stdout]    |            ----------- fields in this struct
[INFO] [stdout] 14 |     pub headline: String,
[INFO] [stdout]    |         ^^^^^^^^
[INFO] [stdout] 15 |     pub location: String,
[INFO] [stdout] 16 |     pub author: String,
[INFO] [stdout]    |         ^^^^^^
[INFO] [stdout] 17 |     pub content: String
[INFO] [stdout]    |         ^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `NewsArticle` has a derived impl for the trait `Debug`, but this is intentionally ignored during dead code analysis
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `some_function1` is never used
[INFO] [stdout]   --> src/concepts/traits.rs:72:4
[INFO] [stdout]    |
[INFO] [stdout] 72 | fn some_function1<T: Display + Clone, U: Clone + Debug>(t: &T, u: &U) -> () {    
[INFO] [stdout]    |    ^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `some_function2` is never used
[INFO] [stdout]   --> src/concepts/traits.rs:75:4
[INFO] [stdout]    |
[INFO] [stdout] 75 | fn some_function2<T, U>(t: &T, u: &U) -> ()
[INFO] [stdout]    |    ^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: fields `content`, `reply`, and `retweet` are never read
[INFO] [stdout]   --> src/concepts/traits.rs:29:9
[INFO] [stdout]    |
[INFO] [stdout] 27 | pub struct Tweet {
[INFO] [stdout]    |            ----- fields in this struct
[INFO] [stdout] 28 |     pub username: String,
[INFO] [stdout] 29 |     pub content: String,
[INFO] [stdout]    |         ^^^^^^^
[INFO] [stdout] 30 |     pub reply: bool,
[INFO] [stdout]    |         ^^^^^
[INFO] [stdout] 31 |     pub retweet: bool
[INFO] [stdout]    |         ^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `Tweet` has a derived impl for the trait `Debug`, but this is intentionally ignored during dead code analysis
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field `part` is never read
[INFO] [stdout]   --> src/concepts/lifetimes.rs:15:9
[INFO] [stdout]    |
[INFO] [stdout] 14 | pub struct ImportantExcerpt<'a> {
[INFO] [stdout]    |            ---------------- field in this struct
[INFO] [stdout] 15 |     pub part: &'a str,
[INFO] [stdout]    |         ^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `ImportantExcerpt` has a derived impl for the trait `Debug`, but this is intentionally ignored during dead code analysis
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `notify3` is never used
[INFO] [stdout]   --> src/concepts/traits.rs:52:8
[INFO] [stdout]    |
[INFO] [stdout] 52 | pub fn notify3(item1: &impl Summary, item2: &impl Summary) {
[INFO] [stdout]    |        ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: method `level` is never used
[INFO] [stdout]   --> src/concepts/lifetimes.rs:34:12
[INFO] [stdout]    |
[INFO] [stdout] 33 | impl<'a> ImportantExcerpt<'a> {
[INFO] [stdout]    | ----------------------------- method in this implementation
[INFO] [stdout] 34 |     pub fn level(&self) -> i32 {
[INFO] [stdout]    |            ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `notify4` is never used
[INFO] [stdout]   --> src/concepts/traits.rs:57:8
[INFO] [stdout]    |
[INFO] [stdout] 57 | pub fn notify4<T: Summary>(item1: &T, item2: &T) {
[INFO] [stdout]    |        ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: method `announce_and_return_part` is never used
[INFO] [stdout]   --> src/concepts/lifetimes.rs:41:12
[INFO] [stdout]    |
[INFO] [stdout] 40 | impl<'a> ImportantExcerpt<'a> {
[INFO] [stdout]    | ----------------------------- method in this implementation
[INFO] [stdout] 41 |     pub fn announce_and_return_part(&self, announcement: &str) -> &str {
[INFO] [stdout]    |            ^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `longest_with_an_announcement` is never used
[INFO] [stdout]   --> src/concepts/lifetimes.rs:51:4
[INFO] [stdout]    |
[INFO] [stdout] 51 | fn longest_with_an_announcement<'a, T>(x: &'a str, y: &'a str, ann: T) -> &'a str 
[INFO] [stdout]    |    ^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `notify5` is never used
[INFO] [stdout]   --> src/concepts/traits.rs:62:8
[INFO] [stdout]    |
[INFO] [stdout] 62 | pub fn notify5(item: &(impl Summary + Display)) {
[INFO] [stdout]    |        ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `notify6` is never used
[INFO] [stdout]   --> src/concepts/traits.rs:67:8
[INFO] [stdout]    |
[INFO] [stdout] 67 | pub fn notify6<T: Summary + Display>(item: &T) {
[INFO] [stdout]    |        ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `some_function1` is never used
[INFO] [stdout]   --> src/concepts/traits.rs:72:4
[INFO] [stdout]    |
[INFO] [stdout] 72 | fn some_function1<T: Display + Clone, U: Clone + Debug>(t: &T, u: &U) -> () {    
[INFO] [stdout]    |    ^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `some_function2` is never used
[INFO] [stdout]   --> src/concepts/traits.rs:75:4
[INFO] [stdout]    |
[INFO] [stdout] 75 | fn some_function2<T, U>(t: &T, u: &U) -> ()
[INFO] [stdout]    |    ^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field `part` is never read
[INFO] [stdout]   --> src/concepts/lifetimes.rs:15:9
[INFO] [stdout]    |
[INFO] [stdout] 14 | pub struct ImportantExcerpt<'a> {
[INFO] [stdout]    |            ---------------- field in this struct
[INFO] [stdout] 15 |     pub part: &'a str,
[INFO] [stdout]    |         ^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `ImportantExcerpt` has a derived impl for the trait `Debug`, but this is intentionally ignored during dead code analysis
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: method `level` is never used
[INFO] [stdout]   --> src/concepts/lifetimes.rs:34:12
[INFO] [stdout]    |
[INFO] [stdout] 33 | impl<'a> ImportantExcerpt<'a> {
[INFO] [stdout]    | ----------------------------- method in this implementation
[INFO] [stdout] 34 |     pub fn level(&self) -> i32 {
[INFO] [stdout]    |            ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: method `announce_and_return_part` is never used
[INFO] [stdout]   --> src/concepts/lifetimes.rs:41:12
[INFO] [stdout]    |
[INFO] [stdout] 40 | impl<'a> ImportantExcerpt<'a> {
[INFO] [stdout]    | ----------------------------- method in this implementation
[INFO] [stdout] 41 |     pub fn announce_and_return_part(&self, announcement: &str) -> &str {
[INFO] [stdout]    |            ^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `longest_with_an_announcement` is never used
[INFO] [stdout]   --> src/concepts/lifetimes.rs:51:4
[INFO] [stdout]    |
[INFO] [stdout] 51 | fn longest_with_an_announcement<'a, T>(x: &'a str, y: &'a str, ann: T) -> &'a str 
[INFO] [stdout]    |    ^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished `dev` profile [unoptimized + debuginfo] target(s) in 0.20s
[INFO] running `Command { std: "docker" "inspect" "39bd2f55ede52a48f8ef477b5a62d42c9d795b806e53618362fae3b017e884ab", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "39bd2f55ede52a48f8ef477b5a62d42c9d795b806e53618362fae3b017e884ab", kill_on_drop: false }`
[INFO] [stdout] 39bd2f55ede52a48f8ef477b5a62d42c9d795b806e53618362fae3b017e884ab