[INFO] cloning repository https://github.com/Delorus/rust_learning
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/Delorus/rust_learning" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FDelorus%2Frust_learning", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FDelorus%2Frust_learning'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 85e9ac89dac5dca12156acf98619a6a7add91951
[INFO] checking Delorus/rust_learning against beta-2020-07-24 for pr-75494-beta
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FDelorus%2Frust_learning" "/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/Delorus/rust_learning on toolchain beta-2020-07-24
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+beta-2020-07-24" "read-manifest" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/Delorus/rust_learning
[INFO] finished tweaking git repo https://github.com/Delorus/rust_learning
[INFO] tweaked toml for git repo https://github.com/Delorus/rust_learning written to /workspace/builds/worker-1/source/Cargo.toml
[INFO] crate git repo https://github.com/Delorus/rust_learning already has a lockfile, it will not be regenerated
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+beta-2020-07-24" "fetch" "--locked" "--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" "rustops/crates-build-env@sha256:a636fd89d022f18117e1dc8fb37a0a009933cdbbe082814857f0e2024962d47c" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2020-07-24" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 8fd6dea66adb43bd0d1829a139048340619d4573d7be5ac48d3d0e51ce8e2158
[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" "8fd6dea66adb43bd0d1829a139048340619d4573d7be5ac48d3d0e51ce8e2158", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "8fd6dea66adb43bd0d1829a139048340619d4573d7be5ac48d3d0e51ce8e2158", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "8fd6dea66adb43bd0d1829a139048340619d4573d7be5ac48d3d0e51ce8e2158", kill_on_drop: false }`
[INFO] [stdout] 8fd6dea66adb43bd0d1829a139048340619d4573d7be5ac48d3d0e51ce8e2158
[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=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" "rustops/crates-build-env@sha256:a636fd89d022f18117e1dc8fb37a0a009933cdbbe082814857f0e2024962d47c" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2020-07-24" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] eeaa4af59faf96cdfc7e2b3de40a40547ed100cf96880ae2b012923f66f6a7b3
[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" "eeaa4af59faf96cdfc7e2b3de40a40547ed100cf96880ae2b012923f66f6a7b3", kill_on_drop: false }`
[INFO] [stderr]     Checking learning v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] error[E0412]: cannot find type `T` in this scope
[INFO] [stdout]   --> src/bin/adv_types.rs:18:30
[INFO] [stdout]    |
[INFO] [stdout] 18 | type Result = result::Result<T, io::Error>;
[INFO] [stdout]    |                              ^ not found in this scope
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0308]: mismatched types
[INFO] [stdout]   --> src/bin/adv_types.rs:20:22
[INFO] [stdout]    |
[INFO] [stdout] 20 | fn never_return() -> ! {
[INFO] [stdout]    |    ------------      ^ expected `!`, found `()`
[INFO] [stdout]    |    |
[INFO] [stdout]    |    implicitly returns `()` as its body has no tail or `return` expression
[INFO] [stdout]    |
[INFO] [stdout]    = note:   expected type `!`
[INFO] [stdout]            found unit type `()`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: aborting due to 2 previous errors
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] Some errors have detailed explanations: E0308, E0412.
[INFO] [stdout] 
[INFO] [stdout] For more information about an error, try `rustc --explain E0308`.
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `connect`
[INFO] [stdout]  --> src/bin/modules/network/mod.rs:1:4
[INFO] [stdout]   |
[INFO] [stdout] 1 | fn connect() {
[INFO] [stdout]   |    ^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `use_module`
[INFO] [stdout]  --> src/bin/modules/network/mod.rs:5:4
[INFO] [stdout]   |
[INFO] [stdout] 5 | fn use_module() {
[INFO] [stdout]   |    ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `connect`
[INFO] [stdout]   --> src/bin/modules/network/mod.rs:10:12
[INFO] [stdout]    |
[INFO] [stdout] 10 |     pub fn connect() {
[INFO] [stdout]    |            ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `use_pub_modules`
[INFO] [stdout]   --> src/bin/modules_main.rs:13:4
[INFO] [stdout]    |
[INFO] [stdout] 13 | fn use_pub_modules() {
[INFO] [stdout]    |    ^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `learning`.
[INFO] [stderr] 
[INFO] [stderr] To learn more, run the command again with --verbose.
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[INFO] [stdout] warning: 4 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct is never constructed: `Guess`
[INFO] [stdout]   --> src/bin/tests.rs:60:8
[INFO] [stdout]    |
[INFO] [stdout] 60 | struct Guess {
[INFO] [stdout]    |        ^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `new`
[INFO] [stdout]   --> src/bin/tests.rs:65:12
[INFO] [stdout]    |
[INFO] [stdout] 65 |     pub fn new(value: u32) -> Guess {
[INFO] [stdout]    |            ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `return_closures`
[INFO] [stdout]  --> src/bin/adv_functions.rs:5:4
[INFO] [stdout]   |
[INFO] [stdout] 5 | fn return_closures() -> Box<dyn Fn(i32) -> i32> {
[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] error[E0412]: cannot find type `T` in this scope
[INFO] [stdout]   --> src/bin/adv_types.rs:18:30
[INFO] [stdout]    |
[INFO] [stdout] 18 | type Result = result::Result<T, io::Error>;
[INFO] [stdout]    |                              ^ not found in this scope
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 1 warning emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `connect`
[INFO] [stdout]  --> src/bin/modules/network/mod.rs:1:4
[INFO] [stdout]   |
[INFO] [stdout] 1 | fn connect() {
[INFO] [stdout]   |    ^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field is never read: `value`
[INFO] [stdout]   --> src/bin/tests.rs:61:5
[INFO] [stdout]    |
[INFO] [stdout] 61 |     value: u32,
[INFO] [stdout]    |     ^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `use_module`
[INFO] [stdout]  --> src/bin/modules/network/mod.rs:5:4
[INFO] [stdout]   |
[INFO] [stdout] 5 | fn use_module() {
[INFO] [stdout]   |    ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0308]: mismatched types
[INFO] [stdout]   --> src/bin/adv_types.rs:20:22
[INFO] [stdout]    |
[INFO] [stdout] 20 | fn never_return() -> ! {
[INFO] [stdout]    |    ------------      ^ expected `!`, found `()`
[INFO] [stdout]    |    |
[INFO] [stdout]    |    implicitly returns `()` as its body has no tail or `return` expression
[INFO] [stdout]    |
[INFO] [stdout]    = note:   expected type `!`
[INFO] [stdout]            found unit type `()`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: aborting due to 2 previous errors
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] Some errors have detailed explanations: E0308, E0412.
[INFO] [stdout] 
[INFO] [stdout] For more information about an error, try `rustc --explain E0308`.
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `connect`
[INFO] [stdout]   --> src/bin/modules/network/mod.rs:10:12
[INFO] [stdout]    |
[INFO] [stdout] 10 |     pub fn connect() {
[INFO] [stdout]    |            ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `use_pub_modules`
[INFO] [stdout]   --> src/bin/modules_main.rs:13:4
[INFO] [stdout]    |
[INFO] [stdout] 13 | fn use_pub_modules() {
[INFO] [stdout]    |    ^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 4 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `create_user`
[INFO] [stdout]   --> src/bin/structures.rs:13:4
[INFO] [stdout]    |
[INFO] [stdout] 13 | fn create_user() {
[INFO] [stdout]    |    ^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `create_user_from_another`
[INFO] [stdout]   --> src/bin/structures.rs:28:4
[INFO] [stdout]    |
[INFO] [stdout] 28 | fn create_user_from_another() {
[INFO] [stdout]    |    ^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct is never constructed: `Point`
[INFO] [stdout]   --> src/bin/structures.rs:44:8
[INFO] [stdout]    |
[INFO] [stdout] 44 | struct Point(i32, i32);
[INFO] [stdout]    |        ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `named_tuple`
[INFO] [stdout]   --> src/bin/structures.rs:46:4
[INFO] [stdout]    |
[INFO] [stdout] 46 | fn named_tuple() {
[INFO] [stdout]    |    ^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 1 warning emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 4 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `y`
[INFO] [stdout]   --> src/bin/borrow_checker_ref_and_copy.rs:76:9
[INFO] [stdout]    |
[INFO] [stdout] 76 |     let y = &x;
[INFO] [stdout]    |         ^ help: if this is intentional, prefix it with an underscore: `_y`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `weak_ref_cycle`
[INFO] [stdout]   --> src/bin/smart_ptr_cycle.rs:51:4
[INFO] [stdout]    |
[INFO] [stdout] 51 | fn weak_ref_cycle() {
[INFO] [stdout]    |    ^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]   --> src/bin/borrow_checker_ref_and_copy.rs:77:9
[INFO] [stdout]    |
[INFO] [stdout] 77 |     let mut z = &mut x;
[INFO] [stdout]    |         ----^
[INFO] [stdout]    |         |
[INFO] [stdout]    |         help: remove this `mut`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_mut)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `change_string`
[INFO] [stdout]  --> src/bin/borrow_checker_ref_and_copy.rs:5:4
[INFO] [stdout]   |
[INFO] [stdout] 5 | fn change_string() {
[INFO] [stdout]   |    ^^^^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `move_string_borrowed`
[INFO] [stdout]   --> src/bin/borrow_checker_ref_and_copy.rs:13:4
[INFO] [stdout]    |
[INFO] [stdout] 13 | fn move_string_borrowed() {
[INFO] [stdout]    |    ^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `move_ownership`
[INFO] [stdout]   --> src/bin/borrow_checker_ref_and_copy.rs:21:4
[INFO] [stdout]    |
[INFO] [stdout] 21 | fn move_ownership() {
[INFO] [stdout]    |    ^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `takes_ownership`
[INFO] [stdout]   --> src/bin/borrow_checker_ref_and_copy.rs:29:4
[INFO] [stdout]    |
[INFO] [stdout] 29 | fn takes_ownership(s: String) {
[INFO] [stdout]    |    ^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `return_ownership`
[INFO] [stdout]   --> src/bin/borrow_checker_ref_and_copy.rs:33:4
[INFO] [stdout]    |
[INFO] [stdout] 33 | fn return_ownership() {
[INFO] [stdout]    |    ^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `return_ownership_via_ref`
[INFO] [stdout]   --> src/bin/borrow_checker_ref_and_copy.rs:51:4
[INFO] [stdout]    |
[INFO] [stdout] 51 | fn return_ownership_via_ref() {
[INFO] [stdout]    |    ^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `ref_and_ownership`
[INFO] [stdout]   --> src/bin/borrow_checker_ref_and_copy.rs:62:4
[INFO] [stdout]    |
[INFO] [stdout] 62 | fn ref_and_ownership() {
[INFO] [stdout]    |    ^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 1 warning emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `z`
[INFO] [stdout]   --> src/bin/data_types.rs:31:9
[INFO] [stdout]    |
[INFO] [stdout] 31 |     let z = x as u32 + y;
[INFO] [stdout]    |         ^ help: if this is intentional, prefix it with an underscore: `_z`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 9 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `cast_to_unsigned`
[INFO] [stdout]  --> src/bin/data_types.rs:5:4
[INFO] [stdout]   |
[INFO] [stdout] 5 | fn cast_to_unsigned() {
[INFO] [stdout]   |    ^^^^^^^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `representation_of_number`
[INFO] [stdout]   --> src/bin/data_types.rs:10:4
[INFO] [stdout]    |
[INFO] [stdout] 10 | fn representation_of_number() {
[INFO] [stdout]    |    ^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `implicit_cast`
[INFO] [stdout]   --> src/bin/data_types.rs:27:4
[INFO] [stdout]    |
[INFO] [stdout] 27 | fn implicit_cast() {
[INFO] [stdout]    |    ^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `std_f32`
[INFO] [stdout]   --> src/bin/data_types.rs:34:4
[INFO] [stdout]    |
[INFO] [stdout] 34 | fn std_f32() {
[INFO] [stdout]    |    ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `logic_op`
[INFO] [stdout]   --> src/bin/data_types.rs:71:4
[INFO] [stdout]    |
[INFO] [stdout] 71 | fn logic_op() {
[INFO] [stdout]    |    ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `chars`
[INFO] [stdout]   --> src/bin/data_types.rs:87:4
[INFO] [stdout]    |
[INFO] [stdout] 87 | fn chars() {
[INFO] [stdout]    |    ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `tuples`
[INFO] [stdout]   --> src/bin/data_types.rs:97:4
[INFO] [stdout]    |
[INFO] [stdout] 97 | fn tuples() {
[INFO] [stdout]    |    ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 8 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr] error: build failed
[INFO] running `Command { std: "docker" "inspect" "eeaa4af59faf96cdfc7e2b3de40a40547ed100cf96880ae2b012923f66f6a7b3", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "eeaa4af59faf96cdfc7e2b3de40a40547ed100cf96880ae2b012923f66f6a7b3", kill_on_drop: false }`
[INFO] [stdout] eeaa4af59faf96cdfc7e2b3de40a40547ed100cf96880ae2b012923f66f6a7b3
