[INFO] cloning repository https://github.com/kanishkd4/Rust-by-example
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/kanishkd4/Rust-by-example" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fkanishkd4%2FRust-by-example", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fkanishkd4%2FRust-by-example'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] a2b88db631e7cfa65de6b348419da65cb5c3b8c7
[INFO] testing kanishkd4/Rust-by-example against 1.55.0 for beta-1.56-1
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fkanishkd4%2FRust-by-example" "/workspace/builds/worker-1/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-1/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/kanishkd4/Rust-by-example on toolchain 1.55.0
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.55.0" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/kanishkd4/Rust-by-example
[INFO] finished tweaking git repo https://github.com/kanishkd4/Rust-by-example
[INFO] tweaked toml for git repo https://github.com/kanishkd4/Rust-by-example written to /workspace/builds/worker-1/source/Cargo.toml
[INFO] crate git repo https://github.com/kanishkd4/Rust-by-example already has a lockfile, it will not be regenerated
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.55.0" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-1/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:a89201d6b5b9fd45c15d5952ece0a0129e7e80cb26ec023fd59cf09bc26f1604" "/opt/rustwide/cargo-home/bin/cargo" "+1.55.0" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] a8fbe00401ffe93bbd11f4f45ffd695725505471015c1d61416396d8e0a1a072
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] running `Command { std: "docker" "start" "-a" "a8fbe00401ffe93bbd11f4f45ffd695725505471015c1d61416396d8e0a1a072", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "a8fbe00401ffe93bbd11f4f45ffd695725505471015c1d61416396d8e0a1a072", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "a8fbe00401ffe93bbd11f4f45ffd695725505471015c1d61416396d8e0a1a072", kill_on_drop: false }`
[INFO] [stdout] a8fbe00401ffe93bbd11f4f45ffd695725505471015c1d61416396d8e0a1a072
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-1/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=warn" "-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:a89201d6b5b9fd45c15d5952ece0a0129e7e80cb26ec023fd59cf09bc26f1604" "/opt/rustwide/cargo-home/bin/cargo" "+1.55.0" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] [stdout] 85956b2b49f12a894f91a02377df866ce66c39666a9fbf7ca9c1989c2328fd83
[INFO] running `Command { std: "docker" "start" "-a" "85956b2b49f12a894f91a02377df866ce66c39666a9fbf7ca9c1989c2328fd83", kill_on_drop: false }`
[INFO] [stderr]    Compiling rust-by-example v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: type `u64_t` should have an upper camel case name
[INFO] [stdout]   --> src/bin/c5_types.rs:14:6
[INFO] [stdout]    |
[INFO] [stdout] 14 | type u64_t = u64;
[INFO] [stdout]    |      ^^^^^ help: convert the identifier to upper camel case: `U64T`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(non_camel_case_types)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: type `s` should have an upper camel case name
[INFO] [stdout]   --> src/bin/c14_generics_bounds_where.rs:12:8
[INFO] [stdout]    |
[INFO] [stdout] 12 | struct s<T: Display>(T); // S can only be a type that implements the Display trait - so no vectors
[INFO] [stdout]    |        ^ help: convert the identifier to upper camel case (notice the capitalization): `S`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(non_camel_case_types)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: type alias is never used: `u64_t`
[INFO] [stdout]   --> src/bin/c5_types.rs:14:1
[INFO] [stdout]    |
[INFO] [stdout] 14 | type u64_t = u64;
[INFO] [stdout]    | ^^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: anonymous parameters are deprecated and will be removed in the next edition.
[INFO] [stdout]   --> src/bin/c14_generics_new_associated.rs:60:24
[INFO] [stdout]    |
[INFO] [stdout] 60 |     fn contains(&self, &A, &B) -> bool; // explicitly requires A and B
[INFO] [stdout]    |                        ^^ help: try naming the parameter or explicitly ignoring it: `_: &A`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(anonymous_parameters)]` on by default
[INFO] [stdout]    = warning: this is accepted in the current edition (Rust 2015) but is a hard error in Rust 2018!
[INFO] [stdout]    = note: for more information, see issue #41686 <https://github.com/rust-lang/rust/issues/41686>
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: anonymous parameters are deprecated and will be removed in the next edition.
[INFO] [stdout]   --> src/bin/c14_generics_new_associated.rs:60:28
[INFO] [stdout]    |
[INFO] [stdout] 60 |     fn contains(&self, &A, &B) -> bool; // explicitly requires A and B
[INFO] [stdout]    |                            ^^ help: try naming the parameter or explicitly ignoring it: `_: &B`
[INFO] [stdout]    |
[INFO] [stdout]    = warning: this is accepted in the current edition (Rust 2015) but is a hard error in Rust 2018!
[INFO] [stdout]    = note: for more information, see issue #41686 <https://github.com/rust-lang/rust/issues/41686>
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `printer`
[INFO] [stdout]  --> src/bin/c14_generics_bounds_where.rs:7:4
[INFO] [stdout]   |
[INFO] [stdout] 7 | fn printer<T: Display>(t: T) {
[INFO] [stdout]   |    ^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct is never constructed: `s`
[INFO] [stdout]   --> src/bin/c14_generics_bounds_where.rs:12:8
[INFO] [stdout]    |
[INFO] [stdout] 12 | struct s<T: Display>(T); // S can only be a type that implements the Display trait - so no vectors
[INFO] [stdout]    |        ^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `foo`
[INFO] [stdout]  --> src/bin/c14_generics_functions_impl_traits.rs:8:4
[INFO] [stdout]   |
[INFO] [stdout] 8 | fn foo<T>(_arg: T) {} // becuase T has been specified as a generic type parameter using <T>, 
[INFO] [stdout]   |    ^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct is never constructed: `S`
[INFO] [stdout]   --> src/bin/c14_generics_functions_impl_traits.rs:48:8
[INFO] [stdout]    |
[INFO] [stdout] 48 | struct S(A); // concrete type S that takes concrete type A defined above // commented for struct S below
[INFO] [stdout]    |        ^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct is never constructed: `SGen`
[INFO] [stdout]   --> src/bin/c14_generics_functions_impl_traits.rs:49:8
[INFO] [stdout]    |
[INFO] [stdout] 49 | struct SGen<T>(T); // Generic type SGen
[INFO] [stdout]    |        ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `reg_fn`
[INFO] [stdout]   --> src/bin/c14_generics_functions_impl_traits.rs:51:4
[INFO] [stdout]    |
[INFO] [stdout] 51 | fn reg_fn(_s: S) {} // a regular function that takes an argument of type S - not a generic function
[INFO] [stdout]    |    ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `gen_spec_t`
[INFO] [stdout]   --> src/bin/c14_generics_functions_impl_traits.rs:53:4
[INFO] [stdout]    |
[INFO] [stdout] 53 | fn gen_spec_t(_s: SGen<A>) {} // this is also not a generic as SGen has been given the type A
[INFO] [stdout]    |    ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `gen_spec_i32`
[INFO] [stdout]   --> src/bin/c14_generics_functions_impl_traits.rs:54:4
[INFO] [stdout]    |
[INFO] [stdout] 54 | fn gen_spec_i32(_s: SGen<i32>) {} // this is also not a generic
[INFO] [stdout]    |    ^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `generic`
[INFO] [stdout]   --> src/bin/c14_generics_functions_impl_traits.rs:55:4
[INFO] [stdout]    |
[INFO] [stdout] 55 | fn generic<T>(_s: SGen<T>) {} // a generic function
[INFO] [stdout]    |    ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct is never constructed: `S1`
[INFO] [stdout]   --> src/bin/c14_generics_functions_impl_traits.rs:59:8
[INFO] [stdout]    |
[INFO] [stdout] 59 | struct S1; // concrete type S
[INFO] [stdout]    |        ^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct is never constructed: `GenericVal`
[INFO] [stdout]   --> src/bin/c14_generics_functions_impl_traits.rs:60:8
[INFO] [stdout]    |
[INFO] [stdout] 60 | struct GenericVal<T>(T, ); // Generic type GenericVal
[INFO] [stdout]    |        ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field is never read: `p1`
[INFO] [stdout]   --> src/bin/c3_custom_types_structs.rs:25:5
[INFO] [stdout]    |
[INFO] [stdout] 25 |     p1: Point,
[INFO] [stdout]    |     ^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field is never read: `p2`
[INFO] [stdout]   --> src/bin/c3_custom_types_structs.rs:26:5
[INFO] [stdout]    |
[INFO] [stdout] 26 |     p2: Point,
[INFO] [stdout]    |     ^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `foo`
[INFO] [stdout]   --> src/bin/c9_higher_order_diverging_functions.rs:44:4
[INFO] [stdout]    |
[INFO] [stdout] 44 | fn foo() -> ! {
[INFO] [stdout]    |    ^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable `Food` should have a snake case name
[INFO] [stdout]   --> src/bin/c18_error_option_unwrap.rs:81:21
[INFO] [stdout]    |
[INFO] [stdout] 81 |         Some(Peeled(Food)) => Some(Chopped(Food)),
[INFO] [stdout]    |                     ^^^^ help: convert the identifier to snake case (notice the capitalization): `food`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(non_snake_case)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable `Food` should have a snake case name
[INFO] [stdout]   --> src/bin/c18_error_option_unwrap.rs:87:26
[INFO] [stdout]    |
[INFO] [stdout] 87 |     chopped.map(|Chopped(Food)| Cooked(Food))
[INFO] [stdout]    |                          ^^^^ help: convert the identifier to snake case (notice the capitalization): `food`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 2 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 2 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 9 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: anonymous parameters are deprecated and will be removed in the next edition.
[INFO] [stdout]   --> src/bin/c14_generics_associated_phantom.rs:10:24
[INFO] [stdout]    |
[INFO] [stdout] 10 |     fn contains(&self, &Self::A, &Self::B) -> bool;
[INFO] [stdout]    |                        ^^^^^^^^ help: try naming the parameter or explicitly ignoring it: `_: &Self::A`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(anonymous_parameters)]` on by default
[INFO] [stdout]    = warning: this is accepted in the current edition (Rust 2015) but is a hard error in Rust 2018!
[INFO] [stdout]    = note: for more information, see issue #41686 <https://github.com/rust-lang/rust/issues/41686>
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: anonymous parameters are deprecated and will be removed in the next edition.
[INFO] [stdout]   --> src/bin/c14_generics_associated_phantom.rs:10:34
[INFO] [stdout]    |
[INFO] [stdout] 10 |     fn contains(&self, &Self::A, &Self::B) -> bool;
[INFO] [stdout]    |                                  ^^^^^^^^ help: try naming the parameter or explicitly ignoring it: `_: &Self::B`
[INFO] [stdout]    |
[INFO] [stdout]    = warning: this is accepted in the current edition (Rust 2015) but is a hard error in Rust 2018!
[INFO] [stdout]    = note: for more information, see issue #41686 <https://github.com/rust-lang/rust/issues/41686>
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 3 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 1 warning emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 2 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 2 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `std::iter`
[INFO] [stdout]   --> src/bin/c17_macro_dry_dsl_variadics.rs:37:9
[INFO] [stdout]    |
[INFO] [stdout] 37 |     use std::iter;
[INFO] [stdout]    |         ^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: type `web_event` should have an upper camel case name
[INFO] [stdout]  --> src/bin/c3_custom_types_enums1.rs:6:6
[INFO] [stdout]   |
[INFO] [stdout] 6 | enum web_event {
[INFO] [stdout]   |      ^^^^^^^^^ help: convert the identifier to upper camel case: `WebEvent`
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(non_camel_case_types)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variant `page_load` should have an upper camel case name
[INFO] [stdout]  --> src/bin/c3_custom_types_enums1.rs:8:5
[INFO] [stdout]   |
[INFO] [stdout] 8 |     page_load,
[INFO] [stdout]   |     ^^^^^^^^^ help: convert the identifier to upper camel case: `PageLoad`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variant `page_unload` should have an upper camel case name
[INFO] [stdout]  --> src/bin/c3_custom_types_enums1.rs:9:5
[INFO] [stdout]   |
[INFO] [stdout] 9 |     page_unload,
[INFO] [stdout]   |     ^^^^^^^^^^^ help: convert the identifier to upper camel case: `PageUnload`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variant `key_press` should have an upper camel case name
[INFO] [stdout]   --> src/bin/c3_custom_types_enums1.rs:11:5
[INFO] [stdout]    |
[INFO] [stdout] 11 |     key_press(char),
[INFO] [stdout]    |     ^^^^^^^^^ help: convert the identifier to upper camel case: `KeyPress`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variant `paste` should have an upper camel case name
[INFO] [stdout]   --> src/bin/c3_custom_types_enums1.rs:12:5
[INFO] [stdout]    |
[INFO] [stdout] 12 |     paste(String),
[INFO] [stdout]    |     ^^^^^ help: convert the identifier to upper camel case: `Paste`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variant `click` should have an upper camel case name
[INFO] [stdout]   --> src/bin/c3_custom_types_enums1.rs:14:5
[INFO] [stdout]    |
[INFO] [stdout] 14 |     click { x: i64, y: i64 },
[INFO] [stdout]    |     ^^^^^ help: convert the identifier to upper camel case (notice the capitalization): `Click`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused label
[INFO] [stdout]   --> src/bin/c8_flow_control_ifelse_loops.rs:57:9
[INFO] [stdout]    |
[INFO] [stdout] 57 |         'inner: loop {
[INFO] [stdout]    |         ^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_labels)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `add_assign`
[INFO] [stdout]   --> src/bin/c17_macro_dry_dsl_variadics.rs:21:9
[INFO] [stdout]    |
[INFO] [stdout] 21 |         fn $func<T: $bound<T, Output=T> + Copy>(xs: &mut Vec<T>, ys: &Vec<T>) {
[INFO] [stdout]    |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 32 | op!(add_assign, Add, +=, add);
[INFO] [stdout]    | ------------------------------ in this macro invocation
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(dead_code)]` on by default
[INFO] [stdout]    = note: this warning originates in the macro `op` (in Nightly builds, run with -Z macro-backtrace for more info)
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `mul_assign`
[INFO] [stdout]   --> src/bin/c17_macro_dry_dsl_variadics.rs:21:9
[INFO] [stdout]    |
[INFO] [stdout] 21 |         fn $func<T: $bound<T, Output=T> + Copy>(xs: &mut Vec<T>, ys: &Vec<T>) {
[INFO] [stdout]    |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 33 | op!(mul_assign, Mul, *=, mul);
[INFO] [stdout]    | ------------------------------ in this macro invocation
[INFO] [stdout]    |
[INFO] [stdout]    = note: this warning originates in the macro `op` (in Nightly builds, run with -Z macro-backtrace for more info)
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `sub_assign`
[INFO] [stdout]   --> src/bin/c17_macro_dry_dsl_variadics.rs:21:9
[INFO] [stdout]    |
[INFO] [stdout] 21 |         fn $func<T: $bound<T, Output=T> + Copy>(xs: &mut Vec<T>, ys: &Vec<T>) {
[INFO] [stdout]    |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 34 | op!(sub_assign, Sub, -=, sub);  
[INFO] [stdout]    | ------------------------------ in this macro invocation
[INFO] [stdout]    |
[INFO] [stdout]    = note: this warning originates in the macro `op` (in Nightly builds, run with -Z macro-backtrace for more info)
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct is never constructed: `Deep`
[INFO] [stdout]   --> src/bin/c1_formatted_print.rs:34:8
[INFO] [stdout]    |
[INFO] [stdout] 34 | struct Deep(Structure);
[INFO] [stdout]    |        ^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 2 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: `...` range patterns are deprecated
[INFO] [stdout]   --> src/bin/c8_flow_control_match.rs:10:11
[INFO] [stdout]    |
[INFO] [stdout] 10 |         13...19 => println!("A teen"), // match an inclusive range. I've only seen the pattern ... in a match. ..= also works
[INFO] [stdout]    |           ^^^ help: use `..=` for an inclusive range
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(ellipsis_inclusive_range_patterns)]` on by default
[INFO] [stdout]    = warning: this is accepted in the current edition (Rust 2015) but is a hard error in Rust 2021!
[INFO] [stdout]    = note: for more information, see issue #80165 <https://github.com/rust-lang/rust/issues/80165>
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: `...` range patterns are deprecated
[INFO] [stdout]    --> src/bin/c8_flow_control_match.rs:108:14
[INFO] [stdout]     |
[INFO] [stdout] 108 |         n @ 1...12 => println!("A child of {:?}", n), // again `...` instead of `..=` in match. Just stick to ..= in your own code
[INFO] [stdout]     |              ^^^ help: use `..=` for an inclusive range
[INFO] [stdout]     |
[INFO] [stdout]     = warning: this is accepted in the current edition (Rust 2015) but is a hard error in Rust 2021!
[INFO] [stdout]     = note: for more information, see issue #80165 <https://github.com/rust-lang/rust/issues/80165>
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: `...` range patterns are deprecated
[INFO] [stdout]    --> src/bin/c8_flow_control_match.rs:109:15
[INFO] [stdout]     |
[INFO] [stdout] 109 |         n @ 13...19 => println!("A child of age {:?}", n),
[INFO] [stdout]     |               ^^^ help: use `..=` for an inclusive range
[INFO] [stdout]     |
[INFO] [stdout]     = warning: this is accepted in the current edition (Rust 2015) but is a hard error in Rust 2021!
[INFO] [stdout]     = note: for more information, see issue #80165 <https://github.com/rust-lang/rust/issues/80165>
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 4 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 1 warning emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 6 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 1 warning emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 3 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 16.62s
[INFO] running `Command { std: "docker" "inspect" "85956b2b49f12a894f91a02377df866ce66c39666a9fbf7ca9c1989c2328fd83", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "85956b2b49f12a894f91a02377df866ce66c39666a9fbf7ca9c1989c2328fd83", kill_on_drop: false }`
[INFO] [stdout] 85956b2b49f12a894f91a02377df866ce66c39666a9fbf7ca9c1989c2328fd83
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-1/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=warn" "-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:a89201d6b5b9fd45c15d5952ece0a0129e7e80cb26ec023fd59cf09bc26f1604" "/opt/rustwide/cargo-home/bin/cargo" "+1.55.0" "test" "--frozen" "--no-run" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 2ed6849de50a8b78efd90786c033a05b37925dce613dbec41b67e9e10e16b5f8
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] running `Command { std: "docker" "start" "-a" "2ed6849de50a8b78efd90786c033a05b37925dce613dbec41b67e9e10e16b5f8", kill_on_drop: false }`
[INFO] [stderr]    Compiling rust-by-example v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: type `s` should have an upper camel case name
[INFO] [stdout]   --> src/bin/c14_generics_bounds_where.rs:12:8
[INFO] [stdout]    |
[INFO] [stdout] 12 | struct s<T: Display>(T); // S can only be a type that implements the Display trait - so no vectors
[INFO] [stdout]    |        ^ help: convert the identifier to upper camel case (notice the capitalization): `S`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(non_camel_case_types)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: type `web_event` should have an upper camel case name
[INFO] [stdout]  --> src/bin/c3_custom_types_enums1.rs:6:6
[INFO] [stdout]   |
[INFO] [stdout] 6 | enum web_event {
[INFO] [stdout]   |      ^^^^^^^^^ help: convert the identifier to upper camel case: `WebEvent`
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(non_camel_case_types)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variant `page_load` should have an upper camel case name
[INFO] [stdout]  --> src/bin/c3_custom_types_enums1.rs:8:5
[INFO] [stdout]   |
[INFO] [stdout] 8 |     page_load,
[INFO] [stdout]   |     ^^^^^^^^^ help: convert the identifier to upper camel case: `PageLoad`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variant `page_unload` should have an upper camel case name
[INFO] [stdout]  --> src/bin/c3_custom_types_enums1.rs:9:5
[INFO] [stdout]   |
[INFO] [stdout] 9 |     page_unload,
[INFO] [stdout]   |     ^^^^^^^^^^^ help: convert the identifier to upper camel case: `PageUnload`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variant `key_press` should have an upper camel case name
[INFO] [stdout]   --> src/bin/c3_custom_types_enums1.rs:11:5
[INFO] [stdout]    |
[INFO] [stdout] 11 |     key_press(char),
[INFO] [stdout]    |     ^^^^^^^^^ help: convert the identifier to upper camel case: `KeyPress`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variant `paste` should have an upper camel case name
[INFO] [stdout]   --> src/bin/c3_custom_types_enums1.rs:12:5
[INFO] [stdout]    |
[INFO] [stdout] 12 |     paste(String),
[INFO] [stdout]    |     ^^^^^ help: convert the identifier to upper camel case: `Paste`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variant `click` should have an upper camel case name
[INFO] [stdout]   --> src/bin/c3_custom_types_enums1.rs:14:5
[INFO] [stdout]    |
[INFO] [stdout] 14 |     click { x: i64, y: i64 },
[INFO] [stdout]    |     ^^^^^ help: convert the identifier to upper camel case (notice the capitalization): `Click`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: anonymous parameters are deprecated and will be removed in the next edition.
[INFO] [stdout]   --> src/bin/c14_generics_associated_phantom.rs:10:24
[INFO] [stdout]    |
[INFO] [stdout] 10 |     fn contains(&self, &Self::A, &Self::B) -> bool;
[INFO] [stdout]    |                        ^^^^^^^^ help: try naming the parameter or explicitly ignoring it: `_: &Self::A`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(anonymous_parameters)]` on by default
[INFO] [stdout]    = warning: this is accepted in the current edition (Rust 2015) but is a hard error in Rust 2018!
[INFO] [stdout]    = note: for more information, see issue #41686 <https://github.com/rust-lang/rust/issues/41686>
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: anonymous parameters are deprecated and will be removed in the next edition.
[INFO] [stdout]   --> src/bin/c14_generics_associated_phantom.rs:10:34
[INFO] [stdout]    |
[INFO] [stdout] 10 |     fn contains(&self, &Self::A, &Self::B) -> bool;
[INFO] [stdout]    |                                  ^^^^^^^^ help: try naming the parameter or explicitly ignoring it: `_: &Self::B`
[INFO] [stdout]    |
[INFO] [stdout]    = warning: this is accepted in the current edition (Rust 2015) but is a hard error in Rust 2018!
[INFO] [stdout]    = note: for more information, see issue #41686 <https://github.com/rust-lang/rust/issues/41686>
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: type `u64_t` should have an upper camel case name
[INFO] [stdout]   --> src/bin/c5_types.rs:14:6
[INFO] [stdout]    |
[INFO] [stdout] 14 | type u64_t = u64;
[INFO] [stdout]    |      ^^^^^ help: convert the identifier to upper camel case: `U64T`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(non_camel_case_types)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: type alias is never used: `u64_t`
[INFO] [stdout]   --> src/bin/c5_types.rs:14:1
[INFO] [stdout]    |
[INFO] [stdout] 14 | type u64_t = u64;
[INFO] [stdout]    | ^^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `printer`
[INFO] [stdout]  --> src/bin/c14_generics_bounds_where.rs:7:4
[INFO] [stdout]   |
[INFO] [stdout] 7 | fn printer<T: Display>(t: T) {
[INFO] [stdout]   |    ^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct is never constructed: `s`
[INFO] [stdout]   --> src/bin/c14_generics_bounds_where.rs:12:8
[INFO] [stdout]    |
[INFO] [stdout] 12 | struct s<T: Display>(T); // S can only be a type that implements the Display trait - so no vectors
[INFO] [stdout]    |        ^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct is never constructed: `Deep`
[INFO] [stdout]   --> src/bin/c1_formatted_print.rs:34:8
[INFO] [stdout]    |
[INFO] [stdout] 34 | struct Deep(Structure);
[INFO] [stdout]    |        ^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `foo`
[INFO] [stdout]   --> src/bin/c9_higher_order_diverging_functions.rs:44:4
[INFO] [stdout]    |
[INFO] [stdout] 44 | fn foo() -> ! {
[INFO] [stdout]    |    ^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 1 warning emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 1 warning emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 2 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 3 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 6 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 2 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable `Food` should have a snake case name
[INFO] [stdout]   --> src/bin/c18_error_option_unwrap.rs:81:21
[INFO] [stdout]    |
[INFO] [stdout] 81 |         Some(Peeled(Food)) => Some(Chopped(Food)),
[INFO] [stdout]    |                     ^^^^ help: convert the identifier to snake case (notice the capitalization): `food`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(non_snake_case)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `foo`
[INFO] [stdout]  --> src/bin/c14_generics_functions_impl_traits.rs:8:4
[INFO] [stdout]   |
[INFO] [stdout] 8 | fn foo<T>(_arg: T) {} // becuase T has been specified as a generic type parameter using <T>, 
[INFO] [stdout]   |    ^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct is never constructed: `S`
[INFO] [stdout]   --> src/bin/c14_generics_functions_impl_traits.rs:48:8
[INFO] [stdout]    |
[INFO] [stdout] 48 | struct S(A); // concrete type S that takes concrete type A defined above // commented for struct S below
[INFO] [stdout]    |        ^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct is never constructed: `SGen`
[INFO] [stdout]   --> src/bin/c14_generics_functions_impl_traits.rs:49:8
[INFO] [stdout]    |
[INFO] [stdout] 49 | struct SGen<T>(T); // Generic type SGen
[INFO] [stdout]    |        ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `reg_fn`
[INFO] [stdout]   --> src/bin/c14_generics_functions_impl_traits.rs:51:4
[INFO] [stdout]    |
[INFO] [stdout] 51 | fn reg_fn(_s: S) {} // a regular function that takes an argument of type S - not a generic function
[INFO] [stdout]    |    ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `gen_spec_t`
[INFO] [stdout]   --> src/bin/c14_generics_functions_impl_traits.rs:53:4
[INFO] [stdout]    |
[INFO] [stdout] 53 | fn gen_spec_t(_s: SGen<A>) {} // this is also not a generic as SGen has been given the type A
[INFO] [stdout]    |    ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `gen_spec_i32`
[INFO] [stdout]   --> src/bin/c14_generics_functions_impl_traits.rs:54:4
[INFO] [stdout]    |
[INFO] [stdout] 54 | fn gen_spec_i32(_s: SGen<i32>) {} // this is also not a generic
[INFO] [stdout]    |    ^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `generic`
[INFO] [stdout]   --> src/bin/c14_generics_functions_impl_traits.rs:55:4
[INFO] [stdout]    |
[INFO] [stdout] 55 | fn generic<T>(_s: SGen<T>) {} // a generic function
[INFO] [stdout]    |    ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct is never constructed: `S1`
[INFO] [stdout]   --> src/bin/c14_generics_functions_impl_traits.rs:59:8
[INFO] [stdout]    |
[INFO] [stdout] 59 | struct S1; // concrete type S
[INFO] [stdout]    |        ^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct is never constructed: `GenericVal`
[INFO] [stdout]   --> src/bin/c14_generics_functions_impl_traits.rs:60:8
[INFO] [stdout]    |
[INFO] [stdout] 60 | struct GenericVal<T>(T, ); // Generic type GenericVal
[INFO] [stdout]    |        ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable `Food` should have a snake case name
[INFO] [stdout]   --> src/bin/c18_error_option_unwrap.rs:87:26
[INFO] [stdout]    |
[INFO] [stdout] 87 |     chopped.map(|Chopped(Food)| Cooked(Food))
[INFO] [stdout]    |                          ^^^^ help: convert the identifier to snake case (notice the capitalization): `food`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field is never read: `p1`
[INFO] [stdout]   --> src/bin/c3_custom_types_structs.rs:25:5
[INFO] [stdout]    |
[INFO] [stdout] 25 |     p1: Point,
[INFO] [stdout]    |     ^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field is never read: `p2`
[INFO] [stdout]   --> src/bin/c3_custom_types_structs.rs:26:5
[INFO] [stdout]    |
[INFO] [stdout] 26 |     p2: Point,
[INFO] [stdout]    |     ^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: `...` range patterns are deprecated
[INFO] [stdout]   --> src/bin/c8_flow_control_match.rs:10:11
[INFO] [stdout]    |
[INFO] [stdout] 10 |         13...19 => println!("A teen"), // match an inclusive range. I've only seen the pattern ... in a match. ..= also works
[INFO] [stdout]    |           ^^^ help: use `..=` for an inclusive range
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(ellipsis_inclusive_range_patterns)]` on by default
[INFO] [stdout]    = warning: this is accepted in the current edition (Rust 2015) but is a hard error in Rust 2021!
[INFO] [stdout]    = note: for more information, see issue #80165 <https://github.com/rust-lang/rust/issues/80165>
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: `...` range patterns are deprecated
[INFO] [stdout]    --> src/bin/c8_flow_control_match.rs:108:14
[INFO] [stdout]     |
[INFO] [stdout] 108 |         n @ 1...12 => println!("A child of {:?}", n), // again `...` instead of `..=` in match. Just stick to ..= in your own code
[INFO] [stdout]     |              ^^^ help: use `..=` for an inclusive range
[INFO] [stdout]     |
[INFO] [stdout]     = warning: this is accepted in the current edition (Rust 2015) but is a hard error in Rust 2021!
[INFO] [stdout]     = note: for more information, see issue #80165 <https://github.com/rust-lang/rust/issues/80165>
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: `...` range patterns are deprecated
[INFO] [stdout]    --> src/bin/c8_flow_control_match.rs:109:15
[INFO] [stdout]     |
[INFO] [stdout] 109 |         n @ 13...19 => println!("A child of age {:?}", n),
[INFO] [stdout]     |               ^^^ help: use `..=` for an inclusive range
[INFO] [stdout]     |
[INFO] [stdout]     = warning: this is accepted in the current edition (Rust 2015) but is a hard error in Rust 2021!
[INFO] [stdout]     = note: for more information, see issue #80165 <https://github.com/rust-lang/rust/issues/80165>
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused label
[INFO] [stdout]   --> src/bin/c8_flow_control_ifelse_loops.rs:57:9
[INFO] [stdout]    |
[INFO] [stdout] 57 |         'inner: loop {
[INFO] [stdout]    |         ^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_labels)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: anonymous parameters are deprecated and will be removed in the next edition.
[INFO] [stdout]   --> src/bin/c14_generics_new_associated.rs:60:24
[INFO] [stdout]    |
[INFO] [stdout] 60 |     fn contains(&self, &A, &B) -> bool; // explicitly requires A and B
[INFO] [stdout]    |                        ^^ help: try naming the parameter or explicitly ignoring it: `_: &A`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(anonymous_parameters)]` on by default
[INFO] [stdout]    = warning: this is accepted in the current edition (Rust 2015) but is a hard error in Rust 2018!
[INFO] [stdout]    = note: for more information, see issue #41686 <https://github.com/rust-lang/rust/issues/41686>
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: anonymous parameters are deprecated and will be removed in the next edition.
[INFO] [stdout]   --> src/bin/c14_generics_new_associated.rs:60:28
[INFO] [stdout]    |
[INFO] [stdout] 60 |     fn contains(&self, &A, &B) -> bool; // explicitly requires A and B
[INFO] [stdout]    |                            ^^ help: try naming the parameter or explicitly ignoring it: `_: &B`
[INFO] [stdout]    |
[INFO] [stdout]    = warning: this is accepted in the current edition (Rust 2015) but is a hard error in Rust 2018!
[INFO] [stdout]    = note: for more information, see issue #41686 <https://github.com/rust-lang/rust/issues/41686>
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 2 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 2 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 9 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 2 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 3 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 1 warning emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished test [unoptimized + debuginfo] target(s) in 17.00s
[INFO] running `Command { std: "docker" "inspect" "2ed6849de50a8b78efd90786c033a05b37925dce613dbec41b67e9e10e16b5f8", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "2ed6849de50a8b78efd90786c033a05b37925dce613dbec41b67e9e10e16b5f8", kill_on_drop: false }`
[INFO] [stdout] 2ed6849de50a8b78efd90786c033a05b37925dce613dbec41b67e9e10e16b5f8
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-1/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=warn" "-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:a89201d6b5b9fd45c15d5952ece0a0129e7e80cb26ec023fd59cf09bc26f1604" "/opt/rustwide/cargo-home/bin/cargo" "+1.55.0" "test" "--frozen", kill_on_drop: false }`
[INFO] [stdout] 75939ac1b9e2195744d39b67a7d1053c7b5f8d425d5837fd294be1a63a444084
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] running `Command { std: "docker" "start" "-a" "75939ac1b9e2195744d39b67a7d1053c7b5f8d425d5837fd294be1a63a444084", kill_on_drop: false }`
[INFO] [stderr] warning: function is never used: `foo`
[INFO] [stderr]  --> src/bin/c14_generics_functions_impl_traits.rs:8:4
[INFO] [stderr]   |
[INFO] [stderr] 8 | fn foo<T>(_arg: T) {} // becuase T has been specified as a generic type parameter using <T>, 
[INFO] [stderr]   |    ^^^
[INFO] [stderr]   |
[INFO] [stderr]   = note: `#[warn(dead_code)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: struct is never constructed: `S`
[INFO] [stderr]   --> src/bin/c14_generics_functions_impl_traits.rs:48:8
[INFO] [stderr]    |
[INFO] [stderr] 48 | struct S(A); // concrete type S that takes concrete type A defined above // commented for struct S below
[INFO] [stderr]    |        ^
[INFO] [stderr] 
[INFO] [stderr] warning: struct is never constructed: `SGen`
[INFO] [stderr]   --> src/bin/c14_generics_functions_impl_traits.rs:49:8
[INFO] [stderr]    |
[INFO] [stderr] 49 | struct SGen<T>(T); // Generic type SGen
[INFO] [stderr]    |        ^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `reg_fn`
[INFO] [stderr]   --> src/bin/c14_generics_functions_impl_traits.rs:51:4
[INFO] [stderr]    |
[INFO] [stderr] 51 | fn reg_fn(_s: S) {} // a regular function that takes an argument of type S - not a generic function
[INFO] [stderr]    |    ^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `gen_spec_t`
[INFO] [stderr]   --> src/bin/c14_generics_functions_impl_traits.rs:53:4
[INFO] [stderr]    |
[INFO] [stderr] 53 | fn gen_spec_t(_s: SGen<A>) {} // this is also not a generic as SGen has been given the type A
[INFO] [stderr]    |    ^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `gen_spec_i32`
[INFO] [stderr]   --> src/bin/c14_generics_functions_impl_traits.rs:54:4
[INFO] [stderr]    |
[INFO] [stderr] 54 | fn gen_spec_i32(_s: SGen<i32>) {} // this is also not a generic
[INFO] [stderr]    |    ^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `generic`
[INFO] [stderr]   --> src/bin/c14_generics_functions_impl_traits.rs:55:4
[INFO] [stderr]    |
[INFO] [stderr] 55 | fn generic<T>(_s: SGen<T>) {} // a generic function
[INFO] [stderr]    |    ^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: struct is never constructed: `S1`
[INFO] [stderr]   --> src/bin/c14_generics_functions_impl_traits.rs:59:8
[INFO] [stderr]    |
[INFO] [stderr] 59 | struct S1; // concrete type S
[INFO] [stderr]    |        ^^
[INFO] [stderr] 
[INFO] [stderr] warning: struct is never constructed: `GenericVal`
[INFO] [stderr]   --> src/bin/c14_generics_functions_impl_traits.rs:60:8
[INFO] [stderr]    |
[INFO] [stderr] 60 | struct GenericVal<T>(T, ); // Generic type GenericVal
[INFO] [stderr]    |        ^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: `rust-by-example` (bin "c14_generics_functions_impl_traits" test) generated 9 warnings
[INFO] [stderr] warning: struct is never constructed: `Deep`
[INFO] [stderr]   --> src/bin/c1_formatted_print.rs:34:8
[INFO] [stderr]    |
[INFO] [stderr] 34 | struct Deep(Structure);
[INFO] [stderr]    |        ^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(dead_code)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: `...` range patterns are deprecated
[INFO] [stderr]   --> src/bin/c8_flow_control_match.rs:10:11
[INFO] [stderr]    |
[INFO] [stderr] 10 |         13...19 => println!("A teen"), // match an inclusive range. I've only seen the pattern ... in a match. ..= also works
[INFO] [stderr]    |           ^^^ help: use `..=` for an inclusive range
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(ellipsis_inclusive_range_patterns)]` on by default
[INFO] [stderr]    = warning: this is accepted in the current edition (Rust 2015) but is a hard error in Rust 2021!
[INFO] [stderr]    = note: for more information, see issue #80165 <https://github.com/rust-lang/rust/issues/80165>
[INFO] [stderr] 
[INFO] [stderr] warning: `...` range patterns are deprecated
[INFO] [stderr]    --> src/bin/c8_flow_control_match.rs:108:14
[INFO] [stderr]     |
[INFO] [stderr] 108 |         n @ 1...12 => println!("A child of {:?}", n), // again `...` instead of `..=` in match. Just stick to ..= in your own code
[INFO] [stderr]     |              ^^^ help: use `..=` for an inclusive range
[INFO] [stderr]     |
[INFO] [stderr]     = warning: this is accepted in the current edition (Rust 2015) but is a hard error in Rust 2021!
[INFO] [stderr]     = note: for more information, see issue #80165 <https://github.com/rust-lang/rust/issues/80165>
[INFO] [stderr] 
[INFO] [stderr] warning: `...` range patterns are deprecated
[INFO] [stderr]    --> src/bin/c8_flow_control_match.rs:109:15
[INFO] [stderr]     |
[INFO] [stderr] 109 |         n @ 13...19 => println!("A child of age {:?}", n),
[INFO] [stderr]     |               ^^^ help: use `..=` for an inclusive range
[INFO] [stderr]     |
[INFO] [stderr]     = warning: this is accepted in the current edition (Rust 2015) but is a hard error in Rust 2021!
[INFO] [stderr]     = note: for more information, see issue #80165 <https://github.com/rust-lang/rust/issues/80165>
[INFO] [stderr] 
[INFO] [stderr] warning: anonymous parameters are deprecated and will be removed in the next edition.
[INFO] [stderr]   --> src/bin/c14_generics_new_associated.rs:60:24
[INFO] [stderr]    |
[INFO] [stderr] 60 |     fn contains(&self, &A, &B) -> bool; // explicitly requires A and B
[INFO] [stderr]    |                        ^^ help: try naming the parameter or explicitly ignoring it: `_: &A`
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(anonymous_parameters)]` on by default
[INFO] [stderr]    = warning: this is accepted in the current edition (Rust 2015) but is a hard error in Rust 2018!
[INFO] [stderr]    = note: for more information, see issue #41686 <https://github.com/rust-lang/rust/issues/41686>
[INFO] [stderr] 
[INFO] [stderr] warning: anonymous parameters are deprecated and will be removed in the next edition.
[INFO] [stderr]   --> src/bin/c14_generics_new_associated.rs:60:28
[INFO] [stderr]    |
[INFO] [stderr] 60 |     fn contains(&self, &A, &B) -> bool; // explicitly requires A and B
[INFO] [stderr]    |                            ^^ help: try naming the parameter or explicitly ignoring it: `_: &B`
[INFO] [stderr]    |
[INFO] [stderr]    = warning: this is accepted in the current edition (Rust 2015) but is a hard error in Rust 2018!
[INFO] [stderr]    = note: for more information, see issue #41686 <https://github.com/rust-lang/rust/issues/41686>
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `foo`
[INFO] [stderr]   --> src/bin/c9_higher_order_diverging_functions.rs:44:4
[INFO] [stderr]    |
[INFO] [stderr] 44 | fn foo() -> ! {
[INFO] [stderr]    |    ^^^
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(dead_code)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: variable `Food` should have a snake case name
[INFO] [stderr]   --> src/bin/c18_error_option_unwrap.rs:81:21
[INFO] [stderr]    |
[INFO] [stderr] 81 |         Some(Peeled(Food)) => Some(Chopped(Food)),
[INFO] [stderr]    |                     ^^^^ help: convert the identifier to snake case (notice the capitalization): `food`
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(non_snake_case)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: variable `Food` should have a snake case name
[INFO] [stderr]   --> src/bin/c18_error_option_unwrap.rs:87:26
[INFO] [stderr]    |
[INFO] [stderr] 87 |     chopped.map(|Chopped(Food)| Cooked(Food))
[INFO] [stderr]    |                          ^^^^ help: convert the identifier to snake case (notice the capitalization): `food`
[INFO] [stderr] 
[INFO] [stderr] warning: `rust-by-example` (bin "c1_formatted_print" test) generated 1 warning
[INFO] [stderr] warning: `rust-by-example` (bin "c8_flow_control_match" test) generated 3 warnings
[INFO] [stderr] warning: `rust-by-example` (bin "c14_generics_new_associated" test) generated 2 warnings
[INFO] [stderr] warning: `rust-by-example` (bin "c9_higher_order_diverging_functions" test) generated 1 warning
[INFO] [stderr] warning: `rust-by-example` (bin "c18_error_option_unwrap" test) generated 2 warnings
[INFO] [stderr] warning: unused label
[INFO] [stderr]   --> src/bin/c8_flow_control_ifelse_loops.rs:57:9
[INFO] [stderr]    |
[INFO] [stderr] 57 |         'inner: loop {
[INFO] [stderr]    |         ^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(unused_labels)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: anonymous parameters are deprecated and will be removed in the next edition.
[INFO] [stderr]   --> src/bin/c14_generics_associated_phantom.rs:10:24
[INFO] [stderr]    |
[INFO] [stderr] 10 |     fn contains(&self, &Self::A, &Self::B) -> bool;
[INFO] [stderr]    |                        ^^^^^^^^ help: try naming the parameter or explicitly ignoring it: `_: &Self::A`
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(anonymous_parameters)]` on by default
[INFO] [stderr]    = warning: this is accepted in the current edition (Rust 2015) but is a hard error in Rust 2018!
[INFO] [stderr]    = note: for more information, see issue #41686 <https://github.com/rust-lang/rust/issues/41686>
[INFO] [stderr] 
[INFO] [stderr] warning: anonymous parameters are deprecated and will be removed in the next edition.
[INFO] [stderr]   --> src/bin/c14_generics_associated_phantom.rs:10:34
[INFO] [stderr]    |
[INFO] [stderr] 10 |     fn contains(&self, &Self::A, &Self::B) -> bool;
[INFO] [stderr]    |                                  ^^^^^^^^ help: try naming the parameter or explicitly ignoring it: `_: &Self::B`
[INFO] [stderr]    |
[INFO] [stderr]    = warning: this is accepted in the current edition (Rust 2015) but is a hard error in Rust 2018!
[INFO] [stderr]    = note: for more information, see issue #41686 <https://github.com/rust-lang/rust/issues/41686>
[INFO] [stderr] 
[INFO] [stderr] warning: field is never read: `p1`
[INFO] [stderr]   --> src/bin/c3_custom_types_structs.rs:25:5
[INFO] [stderr]    |
[INFO] [stderr] 25 |     p1: Point,
[INFO] [stderr]    |     ^^^^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(dead_code)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: field is never read: `p2`
[INFO] [stderr]   --> src/bin/c3_custom_types_structs.rs:26:5
[INFO] [stderr]    |
[INFO] [stderr] 26 |     p2: Point,
[INFO] [stderr]    |     ^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: type `s` should have an upper camel case name
[INFO] [stderr]   --> src/bin/c14_generics_bounds_where.rs:12:8
[INFO] [stderr]    |
[INFO] [stderr] 12 | struct s<T: Display>(T); // S can only be a type that implements the Display trait - so no vectors
[INFO] [stderr]    |        ^ help: convert the identifier to upper camel case (notice the capitalization): `S`
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(non_camel_case_types)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `printer`
[INFO] [stderr]  --> src/bin/c14_generics_bounds_where.rs:7:4
[INFO] [stderr]   |
[INFO] [stderr] 7 | fn printer<T: Display>(t: T) {
[INFO] [stderr]   |    ^^^^^^^
[INFO] [stderr]   |
[INFO] [stderr]   = note: `#[warn(dead_code)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: struct is never constructed: `s`
[INFO] [stderr]   --> src/bin/c14_generics_bounds_where.rs:12:8
[INFO] [stderr]    |
[INFO] [stderr] 12 | struct s<T: Display>(T); // S can only be a type that implements the Display trait - so no vectors
[INFO] [stderr]    |        ^
[INFO] [stderr] 
[INFO] [stderr] warning: type `u64_t` should have an upper camel case name
[INFO] [stderr]   --> src/bin/c5_types.rs:14:6
[INFO] [stderr]    |
[INFO] [stderr] 14 | type u64_t = u64;
[INFO] [stderr]    |      ^^^^^ help: convert the identifier to upper camel case: `U64T`
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(non_camel_case_types)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: type alias is never used: `u64_t`
[INFO] [stderr]   --> src/bin/c5_types.rs:14:1
[INFO] [stderr]    |
[INFO] [stderr] 14 | type u64_t = u64;
[INFO] [stderr]    | ^^^^^^^^^^^^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(dead_code)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: type `web_event` should have an upper camel case name
[INFO] [stderr]  --> src/bin/c3_custom_types_enums1.rs:6:6
[INFO] [stderr]   |
[INFO] [stderr] 6 | enum web_event {
[INFO] [stderr]   |      ^^^^^^^^^ help: convert the identifier to upper camel case: `WebEvent`
[INFO] [stderr]   |
[INFO] [stderr]   = note: `#[warn(non_camel_case_types)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: variant `page_load` should have an upper camel case name
[INFO] [stderr]  --> src/bin/c3_custom_types_enums1.rs:8:5
[INFO] [stderr]   |
[INFO] [stderr] 8 |     page_load,
[INFO] [stderr]   |     ^^^^^^^^^ help: convert the identifier to upper camel case: `PageLoad`
[INFO] [stderr] 
[INFO] [stderr] warning: variant `page_unload` should have an upper camel case name
[INFO] [stderr]  --> src/bin/c3_custom_types_enums1.rs:9:5
[INFO] [stderr]   |
[INFO] [stderr] 9 |     page_unload,
[INFO] [stderr]   |     ^^^^^^^^^^^ help: convert the identifier to upper camel case: `PageUnload`
[INFO] [stderr] 
[INFO] [stderr] warning: variant `key_press` should have an upper camel case name
[INFO] [stderr]   --> src/bin/c3_custom_types_enums1.rs:11:5
[INFO] [stderr]    |
[INFO] [stderr] 11 |     key_press(char),
[INFO] [stderr]    |     ^^^^^^^^^ help: convert the identifier to upper camel case: `KeyPress`
[INFO] [stderr] 
[INFO] [stderr] warning: variant `paste` should have an upper camel case name
[INFO] [stderr]   --> src/bin/c3_custom_types_enums1.rs:12:5
[INFO] [stderr]    |
[INFO] [stderr] 12 |     paste(String),
[INFO] [stderr]    |     ^^^^^ help: convert the identifier to upper camel case: `Paste`
[INFO] [stderr] 
[INFO] [stderr] warning: variant `click` should have an upper camel case name
[INFO] [stderr]   --> src/bin/c3_custom_types_enums1.rs:14:5
[INFO] [stderr]    |
[INFO] [stderr] 14 |     click { x: i64, y: i64 },
[INFO] [stderr]    |     ^^^^^ help: convert the identifier to upper camel case (notice the capitalization): `Click`
[INFO] [stderr] 
[INFO] [stderr] warning: `rust-by-example` (bin "c8_flow_control_ifelse_loops" test) generated 1 warning
[INFO] [stderr] warning: `rust-by-example` (bin "c14_generics_associated_phantom" test) generated 2 warnings
[INFO] [stderr] warning: `rust-by-example` (bin "c3_custom_types_structs" test) generated 2 warnings
[INFO] [stderr] warning: `rust-by-example` (bin "c14_generics_bounds_where" test) generated 3 warnings
[INFO] [stderr] warning: `rust-by-example` (bin "c5_types" test) generated 2 warnings
[INFO] [stderr] warning: `rust-by-example` (bin "c3_custom_types_enums1" test) generated 6 warnings
[INFO] [stderr]     Finished test [unoptimized + debuginfo] target(s) in 0.02s
[INFO] [stderr]      Running unittests (/opt/rustwide/target/debug/deps/c10_modules_use_self_hierarchy-3e72de706f87dc8a)
[INFO] [stdout] 
[INFO] [stderr]      Running unittests (/opt/rustwide/target/debug/deps/c10_modules_visibility-0f266c450e2c864e)
[INFO] [stdout] running 0 tests
[INFO] [stdout] 
[INFO] [stdout] test result: ok. 0 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 0.00s
[INFO] [stdout] 
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[INFO] [stdout] 
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[INFO] [stdout] 
[INFO] [stderr]      Running unittests (/opt/rustwide/target/debug/deps/c17_macro_dry_dsl_variadics-0520507911160c2a)
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[INFO] [stderr]      Running unittests (/opt/rustwide/target/debug/deps/c17_macro_rules_syntax-c244e527a643755f)
[INFO] [stdout] test test::add_assign ... ok
[INFO] [stdout] test test::sub_assign ... ok
[INFO] [stdout] test test::mul_assign ... ok
[INFO] [stdout] 
[INFO] [stdout] test result: ok. 3 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 0.00s
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[INFO] [stdout] test result: ok. 0 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 0.00s
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[INFO] [stdout] 
[INFO] [stderr]      Running unittests (/opt/rustwide/target/debug/deps/c6_conversions-756f8c396d258f0f)
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[INFO] [stdout] test result: ok. 0 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 0.00s
[INFO] [stdout] 
[INFO] [stderr]      Running unittests (/opt/rustwide/target/debug/deps/c8_flow_control_match-79131f4ae8a8cbe9)
[INFO] [stdout] 
[INFO] [stderr]      Running unittests (/opt/rustwide/target/debug/deps/c9_functions_closures-2ce9ae8e82f445ad)
[INFO] [stdout] running 0 tests
[INFO] [stderr]      Running unittests (/opt/rustwide/target/debug/deps/c9_functions_methods-0ece229cd621b33a)
[INFO] [stdout] 
[INFO] [stdout] test result: ok. 0 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 0.00s
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] running 0 tests
[INFO] [stdout] 
[INFO] [stdout] test result: ok. 0 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 0.00s
[INFO] [stdout] 
[INFO] [stderr]      Running unittests (/opt/rustwide/target/debug/deps/c9_higher_order_diverging_functions-1a7f741899202921)
[INFO] [stdout] 
[INFO] [stdout] running 0 tests
[INFO] [stdout] 
[INFO] [stdout] test result: ok. 0 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 0.00s
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] running 0 tests
[INFO] [stdout] 
[INFO] [stdout] test result: ok. 0 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 0.00s
[INFO] [stdout] 
[INFO] running `Command { std: "docker" "inspect" "75939ac1b9e2195744d39b67a7d1053c7b5f8d425d5837fd294be1a63a444084", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "75939ac1b9e2195744d39b67a7d1053c7b5f8d425d5837fd294be1a63a444084", kill_on_drop: false }`
[INFO] [stdout] 75939ac1b9e2195744d39b67a7d1053c7b5f8d425d5837fd294be1a63a444084