[INFO] cloning repository https://github.com/osobiehl/rust-for-cpp-devs
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/osobiehl/rust-for-cpp-devs" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fosobiehl%2Frust-for-cpp-devs", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fosobiehl%2Frust-for-cpp-devs'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] e9907d34e928e4e76d215da9c2af268639f35b8e
[INFO] checking osobiehl/rust-for-cpp-devs against try#a75eafceea413a1b40c0e0769db85e08ec17160b for pr-133925
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fosobiehl%2Frust-for-cpp-devs" "/workspace/builds/worker-7-tc2/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-7-tc2/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/osobiehl/rust-for-cpp-devs on toolchain a75eafceea413a1b40c0e0769db85e08ec17160b
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+a75eafceea413a1b40c0e0769db85e08ec17160b" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/osobiehl/rust-for-cpp-devs
[INFO] finished tweaking git repo https://github.com/osobiehl/rust-for-cpp-devs
[INFO] tweaked toml for git repo https://github.com/osobiehl/rust-for-cpp-devs written to /workspace/builds/worker-7-tc2/source/Cargo.toml
[INFO] crate git repo https://github.com/osobiehl/rust-for-cpp-devs already has a lockfile, it will not be regenerated
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+a75eafceea413a1b40c0e0769db85e08ec17160b" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr] warning: file `/workspace/builds/worker-7-tc2/source/03_borrow_checking/01_references.rs` found to be present in multiple build targets:
[INFO] [stderr]   * `bin` target `01_borrow_checking`
[INFO] [stderr]   * `bin` target `01_references`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-7-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-7-tc2/source:/opt/rustwide/workdir:ro,Z" "-v" "/var/lib/crater-agent-workspace/cargo-home:/opt/rustwide/cargo-home:ro,Z" "-v" "/var/lib/crater-agent-workspace/rustup-home:/opt/rustwide/rustup-home:ro,Z" "-e" "SOURCE_DIR=/opt/rustwide/workdir" "-e" "CARGO_TARGET_DIR=/opt/rustwide/target" "-e" "CARGO_HOME=/opt/rustwide/cargo-home" "-e" "RUSTUP_HOME=/opt/rustwide/rustup-home" "-w" "/opt/rustwide/workdir" "-m" "1610612736" "--user" "0:0" "--network" "none" "ghcr.io/rust-lang/crates-build-env/linux@sha256:c80049f3b88b82089a44e0f06d0d6029d44b96b7257e55a1cd63dbc9f4c33334" "/opt/rustwide/cargo-home/bin/cargo" "+a75eafceea413a1b40c0e0769db85e08ec17160b" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] c1b4f8562203714df43e068607c2e7cb0fa4c690e90976a864a7188591710299
[INFO] running `Command { std: "docker" "start" "-a" "c1b4f8562203714df43e068607c2e7cb0fa4c690e90976a864a7188591710299", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "c1b4f8562203714df43e068607c2e7cb0fa4c690e90976a864a7188591710299", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "c1b4f8562203714df43e068607c2e7cb0fa4c690e90976a864a7188591710299", kill_on_drop: false }`
[INFO] [stdout] c1b4f8562203714df43e068607c2e7cb0fa4c690e90976a864a7188591710299
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-7-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-7-tc2/source:/opt/rustwide/workdir:ro,Z" "-v" "/var/lib/crater-agent-workspace/cargo-home:/opt/rustwide/cargo-home:ro,Z" "-v" "/var/lib/crater-agent-workspace/rustup-home:/opt/rustwide/rustup-home:ro,Z" "-e" "SOURCE_DIR=/opt/rustwide/workdir" "-e" "CARGO_TARGET_DIR=/opt/rustwide/target" "-e" "CARGO_INCREMENTAL=0" "-e" "RUST_BACKTRACE=full" "-e" "RUSTFLAGS=--cap-lints=forbid" "-e" "RUSTDOCFLAGS=--cap-lints=forbid" "-e" "CARGO_HOME=/opt/rustwide/cargo-home" "-e" "RUSTUP_HOME=/opt/rustwide/rustup-home" "-w" "/opt/rustwide/workdir" "-m" "1610612736" "--user" "0:0" "--network" "none" "ghcr.io/rust-lang/crates-build-env/linux@sha256:c80049f3b88b82089a44e0f06d0d6029d44b96b7257e55a1cd63dbc9f4c33334" "/opt/rustwide/cargo-home/bin/cargo" "+a75eafceea413a1b40c0e0769db85e08ec17160b" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] a89e30e5c0665d34e6707436cf4881f3889edc8c877969dc107936864978aaa1
[INFO] running `Command { std: "docker" "start" "-a" "a89e30e5c0665d34e6707436cf4881f3889edc8c877969dc107936864978aaa1", kill_on_drop: false }`
[INFO] [stderr] warning: file `/opt/rustwide/workdir/03_borrow_checking/01_references.rs` found to be present in multiple build targets:
[INFO] [stderr]   * `bin` target `01_borrow_checking`
[INFO] [stderr]   * `bin` target `01_references`
[INFO] [stderr]     Checking rust_for_cpp_devs v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: function `main` is never used
[INFO] [stdout]  --> src/lib.rs:1:4
[INFO] [stdout]   |
[INFO] [stdout] 1 | fn main() {
[INFO] [stdout]   |    ^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0106]: missing lifetime specifier
[INFO] [stdout]   --> 03_borrow_checking/01_references.rs:22:47
[INFO] [stdout]    |
[INFO] [stdout] 22 | fn oldest_person(p1: &Person, p2: &Person) -> &Person{
[INFO] [stdout]    |                      -------      -------     ^ expected named lifetime parameter
[INFO] [stdout]    |
[INFO] [stdout]    = help: this function's return type contains a borrowed value, but the signature does not say whether it is borrowed from `p1` or `p2`
[INFO] [stdout] help: consider introducing a named lifetime parameter
[INFO] [stdout]    |
[INFO] [stdout] 22 | fn oldest_person<'a>(p1: &'a Person, p2: &'a Person) -> &'a Person{
[INFO] [stdout]    |                 ++++      ++              ++             ++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] For more information about this error, try `rustc --explain E0106`.
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `rust_for_cpp_devs` (bin "01_references") due to 1 previous error
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[INFO] [stdout] error[E0425]: cannot find value `new_value` in this scope
[INFO] [stdout]   --> 02_common_uses/03_user_types.rs:30:26
[INFO] [stdout]    |
[INFO] [stdout] 30 |     my_struct.set_my_int(new_value);
[INFO] [stdout]    |                          ^^^^^^^^^ not found in this scope
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: expected `;`, found `println`
[INFO] [stdout]   --> 01_basic_syntax/02_control_flow.rs:23:6
[INFO] [stdout]    |
[INFO] [stdout] 23 |     }
[INFO] [stdout]    |      ^ help: add `;` here
[INFO] [stdout] 24 |
[INFO] [stdout] 25 |     println!("{}", x_text);
[INFO] [stdout]    |     ------- unexpected token
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: expected `;`, found `std`
[INFO] [stdout]   --> 01_basic_syntax/02_control_flow.rs:32:30
[INFO] [stdout]    |
[INFO] [stdout] 32 |         let s = String::new()
[INFO] [stdout]    |                              ^ help: add `;` here
[INFO] [stdout] 33 |         std::io::stdin().read_line(&mut s).expect("io failed");
[INFO] [stdout]    |         --- unexpected token
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: expected `;`, found `do_check_if`
[INFO] [stdout]   --> 01_basic_syntax/02_control_flow.rs:37:6
[INFO] [stdout]    |
[INFO] [stdout] 37 |     }
[INFO] [stdout]    |      ^ help: add `;` here
[INFO] [stdout] 38 |     do_check_if(should_be_42);
[INFO] [stdout]    |     ----------- unexpected token
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0382]: borrow of moved value: `v`
[INFO] [stdout]  --> 02_common_uses/06_iterators.rs:4:9
[INFO] [stdout]   |
[INFO] [stdout] 2 | fn duplicate_vector(v: &mut Vec<u32>){
[INFO] [stdout]   |                     - move occurs because `v` has type `&mut Vec<u32>`, which does not implement the `Copy` trait
[INFO] [stdout] 3 |     for n in v{
[INFO] [stdout]   |              - `v` moved due to this implicit call to `.into_iter()`
[INFO] [stdout] 4 |         v.push(*n);
[INFO] [stdout]   |         ^ value borrowed here after move
[INFO] [stdout]   |
[INFO] [stdout] note: `into_iter` takes ownership of the receiver `self`, which moves `v`
[INFO] [stdout]  --> /rustc/a75eafceea413a1b40c0e0769db85e08ec17160b/library/core/src/iter/traits/collect.rs:313:18
[INFO] [stdout] help: consider creating a fresh reborrow of `v` here
[INFO] [stdout]   |
[INFO] [stdout] 3 |     for n in &mut *v{
[INFO] [stdout]   |              ++++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0277]: `MyStruct` doesn't implement `std::fmt::Display`
[INFO] [stdout]   --> 02_common_uses/03_user_types.rs:31:20
[INFO] [stdout]    |
[INFO] [stdout] 31 |     println!("{}", my_struct);
[INFO] [stdout]    |                    ^^^^^^^^^ `MyStruct` cannot be formatted with the default formatter
[INFO] [stdout]    |
[INFO] [stdout]    = help: the trait `std::fmt::Display` is not implemented for `MyStruct`
[INFO] [stdout]    = note: in format strings you may be able to use `{:?}` (or {:#?} for pretty-print) instead
[INFO] [stdout]    = note: this error originates in the macro `$crate::format_args_nl` which comes from the expansion of the macro `println` (in Nightly builds, run with -Z macro-backtrace for more info)
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unnecessary parentheses around `if` condition
[INFO] [stdout]  --> 01_basic_syntax/02_control_flow.rs:7:8
[INFO] [stdout]   |
[INFO] [stdout] 7 |     if (x == 0) {
[INFO] [stdout]   |        ^      ^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_parens)]` on by default
[INFO] [stdout] help: remove these parentheses
[INFO] [stdout]   |
[INFO] [stdout] 7 -     if (x == 0) {
[INFO] [stdout] 7 +     if x == 0 {
[INFO] [stdout]   |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unnecessary parentheses around `if` condition
[INFO] [stdout]  --> 01_basic_syntax/02_control_flow.rs:9:15
[INFO] [stdout]   |
[INFO] [stdout] 9 |     } else if (x < 100) {
[INFO] [stdout]   |               ^       ^
[INFO] [stdout]   |
[INFO] [stdout] help: remove these parentheses
[INFO] [stdout]   |
[INFO] [stdout] 9 -     } else if (x < 100) {
[INFO] [stdout] 9 +     } else if x < 100 {
[INFO] [stdout]   |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] For more information about this error, try `rustc --explain E0382`.
[INFO] [stdout] 
[INFO] [stdout] error: expected `;`, found `println`
[INFO] [stdout]   --> 01_basic_syntax/02_control_flow.rs:23:6
[INFO] [stdout]    |
[INFO] [stdout] 23 |     }
[INFO] [stdout]    |      ^ help: add `;` here
[INFO] [stdout] 24 |
[INFO] [stdout] 25 |     println!("{}", x_text);
[INFO] [stdout]    |     ------- unexpected token
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: expected `;`, found `std`
[INFO] [stdout]   --> 01_basic_syntax/02_control_flow.rs:32:30
[INFO] [stdout]    |
[INFO] [stdout] 32 |         let s = String::new()
[INFO] [stdout]    |                              ^ help: add `;` here
[INFO] [stdout] 33 |         std::io::stdin().read_line(&mut s).expect("io failed");
[INFO] [stdout]    |         --- unexpected token
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: expected `;`, found `do_check_if`
[INFO] [stdout]   --> 01_basic_syntax/02_control_flow.rs:37:6
[INFO] [stdout]    |
[INFO] [stdout] 37 |     }
[INFO] [stdout]    |      ^ help: add `;` here
[INFO] [stdout] 38 |     do_check_if(should_be_42);
[INFO] [stdout]    |     ----------- unexpected token
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0594]: cannot assign to `self.my_int`, which is behind a `&` reference
[INFO] [stdout]   --> 02_common_uses/03_user_types.rs:20:9
[INFO] [stdout]    |
[INFO] [stdout] 20 |         self.my_int = new_value;
[INFO] [stdout]    |         ^^^^^^^^^^^^^^^^^^^^^^^ `self` is a `&` reference, so the data it refers to cannot be written
[INFO] [stdout]    |
[INFO] [stdout] help: consider changing this to be a mutable reference
[INFO] [stdout]    |
[INFO] [stdout] 19 |     pub fn set_my_int(&mut self, new_value: i32){
[INFO] [stdout]    |                       ~~~~~~~~~
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] Some errors have detailed explanations: E0277, E0425, E0594.
[INFO] [stdout] 
[INFO] [stdout] For more information about an error, try `rustc --explain E0277`.
[INFO] [stdout] 
[INFO] [stdout] error[E0782]: expected a type, found a trait
[INFO] [stdout]   --> 02_common_uses/04_interfaces.rs:25:36
[INFO] [stdout]    |
[INFO] [stdout] 25 | fn runtime_polymorphism(drawable: &Drawable){
[INFO] [stdout]    |                                    ^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout] help: use a new generic type parameter, constrained by `Drawable`
[INFO] [stdout]    |
[INFO] [stdout] 25 | fn runtime_polymorphism<T: Drawable>(drawable: &T){
[INFO] [stdout]    |                        +++++++++++++            ~
[INFO] [stdout] help: you can also use an opaque type, but users won't be able to specify the type parameter when calling the `fn`, having to rely exclusively on type inference
[INFO] [stdout]    |
[INFO] [stdout] 25 | fn runtime_polymorphism(drawable: &impl Drawable){
[INFO] [stdout]    |                                    ++++
[INFO] [stdout] help: alternatively, use a trait object to accept any type that implements `Drawable`, accessing its methods at runtime using dynamic dispatch
[INFO] [stdout]    |
[INFO] [stdout] 25 | fn runtime_polymorphism(drawable: &dyn Drawable){
[INFO] [stdout]    |                                    +++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0596]: cannot borrow `s` as mutable, as it is not declared as mutable
[INFO] [stdout]   --> 01_basic_syntax/02_control_flow.rs:33:36
[INFO] [stdout]    |
[INFO] [stdout] 33 |         std::io::stdin().read_line(&mut s).expect("io failed");
[INFO] [stdout]    |                                    ^^^^^^ cannot borrow as mutable
[INFO] [stdout]    |
[INFO] [stdout] help: consider changing this to be mutable
[INFO] [stdout]    |
[INFO] [stdout] 32 |         let mut s = String::new()
[INFO] [stdout]    |             +++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] For more information about this error, try `rustc --explain E0596`.
[INFO] [stdout] 
[INFO] [stdout] warning: unnecessary parentheses around `if` condition
[INFO] [stdout]  --> 01_basic_syntax/02_control_flow.rs:7:8
[INFO] [stdout]   |
[INFO] [stdout] 7 |     if (x == 0) {
[INFO] [stdout]   |        ^      ^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_parens)]` on by default
[INFO] [stdout] help: remove these parentheses
[INFO] [stdout]   |
[INFO] [stdout] 7 -     if (x == 0) {
[INFO] [stdout] 7 +     if x == 0 {
[INFO] [stdout]   |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `rust_for_cpp_devs` (bin "06_iterators") due to 1 previous error
[INFO] [stdout] warning: unnecessary parentheses around `if` condition
[INFO] [stdout]  --> 01_basic_syntax/02_control_flow.rs:9:15
[INFO] [stdout]   |
[INFO] [stdout] 9 |     } else if (x < 100) {
[INFO] [stdout]   |               ^       ^
[INFO] [stdout]   |
[INFO] [stdout] help: remove these parentheses
[INFO] [stdout]   |
[INFO] [stdout] 9 -     } else if (x < 100) {
[INFO] [stdout] 9 +     } else if x < 100 {
[INFO] [stdout]   |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `rust_for_cpp_devs` (bin "02_control_flow" test) due to 4 previous errors; 2 warnings emitted
[INFO] [stdout] error[E0596]: cannot borrow `s` as mutable, as it is not declared as mutable
[INFO] [stdout]   --> 01_basic_syntax/02_control_flow.rs:33:36
[INFO] [stdout]    |
[INFO] [stdout] 33 |         std::io::stdin().read_line(&mut s).expect("io failed");
[INFO] [stdout]    |                                    ^^^^^^ cannot borrow as mutable
[INFO] [stdout]    |
[INFO] [stdout] help: consider changing this to be mutable
[INFO] [stdout]    |
[INFO] [stdout] 32 |         let mut s = String::new()
[INFO] [stdout]    |             +++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] For more information about this error, try `rustc --explain E0596`.
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `rust_for_cpp_devs` (bin "03_user_types" test) due to 3 previous errors
[INFO] [stderr] error: could not compile `rust_for_cpp_devs` (bin "02_control_flow") due to 4 previous errors; 2 warnings emitted
[INFO] [stdout] error[E0308]: mismatched types
[INFO] [stdout]   --> 02_common_uses/04_interfaces.rs:38:31
[INFO] [stdout]    |
[INFO] [stdout] 38 |     compile_time_polymorphism(c);
[INFO] [stdout]    |     ------------------------- ^ expected `&_`, found `Circle`
[INFO] [stdout]    |     |
[INFO] [stdout]    |     arguments to this function are incorrect
[INFO] [stdout]    |
[INFO] [stdout]    = note: expected reference `&_`
[INFO] [stdout]                  found struct `Circle`
[INFO] [stdout] note: function defined here
[INFO] [stdout]   --> 02_common_uses/04_interfaces.rs:29:4
[INFO] [stdout]    |
[INFO] [stdout] 29 | fn compile_time_polymorphism<T: Drawable>( drawable: &T){
[INFO] [stdout]    |    ^^^^^^^^^^^^^^^^^^^^^^^^^               ------------
[INFO] [stdout] help: consider borrowing here
[INFO] [stdout]    |
[INFO] [stdout] 38 |     compile_time_polymorphism(&c);
[INFO] [stdout]    |                               +
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] Some errors have detailed explanations: E0308, E0782.
[INFO] [stdout] 
[INFO] [stdout] For more information about an error, try `rustc --explain E0308`.
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `rust_for_cpp_devs` (bin "04_interfaces") due to 2 previous errors
[INFO] running `Command { std: "docker" "inspect" "a89e30e5c0665d34e6707436cf4881f3889edc8c877969dc107936864978aaa1", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "a89e30e5c0665d34e6707436cf4881f3889edc8c877969dc107936864978aaa1", kill_on_drop: false }`
[INFO] [stdout] a89e30e5c0665d34e6707436cf4881f3889edc8c877969dc107936864978aaa1