[INFO] fetching crate rclist 0.0.1...
[INFO] checking rclist-0.0.1 against try#cac44d9528e3bbbdaa1537d187bd489ccc5de18c for pr-91141
[INFO] extracting crate rclist 0.0.1 into /workspace/builds/worker-85/source
[INFO] validating manifest of crates.io crate rclist 0.0.1 on toolchain cac44d9528e3bbbdaa1537d187bd489ccc5de18c
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+cac44d9528e3bbbdaa1537d187bd489ccc5de18c" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking crates.io crate rclist 0.0.1
[INFO] finished tweaking crates.io crate rclist 0.0.1
[INFO] tweaked toml for crates.io crate rclist 0.0.1 written to /workspace/builds/worker-85/source/Cargo.toml
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+cac44d9528e3bbbdaa1537d187bd489ccc5de18c" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+cac44d9528e3bbbdaa1537d187bd489ccc5de18c" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[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-85/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-85/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@sha256:5736fa189c1c60b01babf4b8b698fe57b6ecc41933a7ff2e0b8d7a221459412b" "/opt/rustwide/cargo-home/bin/cargo" "+cac44d9528e3bbbdaa1537d187bd489ccc5de18c" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] a13f697ec490b0f6391789ec9a58afac57db33f92711bba8ac2eb3ea7cfee1a9
[INFO] running `Command { std: "docker" "start" "-a" "a13f697ec490b0f6391789ec9a58afac57db33f92711bba8ac2eb3ea7cfee1a9", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "a13f697ec490b0f6391789ec9a58afac57db33f92711bba8ac2eb3ea7cfee1a9", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "a13f697ec490b0f6391789ec9a58afac57db33f92711bba8ac2eb3ea7cfee1a9", kill_on_drop: false }`
[INFO] [stdout] a13f697ec490b0f6391789ec9a58afac57db33f92711bba8ac2eb3ea7cfee1a9
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-85/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-85/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" "ghcr.io/rust-lang/crates-build-env/linux@sha256:5736fa189c1c60b01babf4b8b698fe57b6ecc41933a7ff2e0b8d7a221459412b" "/opt/rustwide/cargo-home/bin/cargo" "+cac44d9528e3bbbdaa1537d187bd489ccc5de18c" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 5b3074fa577be65262ce109b20937b004adb782680e7430eecd24c5251ec4507
[INFO] running `Command { std: "docker" "start" "-a" "5b3074fa577be65262ce109b20937b004adb782680e7430eecd24c5251ec4507", kill_on_drop: false }`
[INFO] [stderr]     Checking rclist v0.0.1 (/opt/rustwide/workdir)
[INFO] [stdout] error[E0599]: no method named `downgrade` found for reference `&Rc<T>` in the current scope
[INFO] [stdout]   --> src/lib.rs:31:50
[INFO] [stdout]    |
[INFO] [stdout] 31 |             &Link::Strong(ref x) => Link::Weak(x.downgrade()),
[INFO] [stdout]    |                                                --^^^^^^^^^
[INFO] [stdout]    |                                                | |
[INFO] [stdout]    |                                                | this is an associated function, not a method
[INFO] [stdout]    |                                                help: use associated function syntax instead: `Rc::<T>::downgrade`
[INFO] [stdout]    |
[INFO] [stdout]    = note: found the following associated functions; to be used as methods, functions must have a `self` parameter
[INFO] [stdout]    = note: the candidate is defined in an impl for the type `Rc<T>`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0271]: type mismatch resolving `<RcListIter<u8> as std::iter::Iterator>::Item == &_`
[INFO] [stdout]     --> src/test.rs:12:41
[INFO] [stdout]      |
[INFO] [stdout] 12   |     let vempty : Vec<u8> = empty.iter().cloned().cloned().collect();
[INFO] [stdout]      |                                         ^^^^^^ expected reference, found struct `Rc`
[INFO] [stdout]      |
[INFO] [stdout]      = note: expected reference `&_`
[INFO] [stdout]                    found struct `Rc<Node<u8>>`
[INFO] [stdout] note: required by a bound in `cloned`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0599]: the method `cloned` exists for struct `Cloned<RcListIter<u8>>`, but its trait bounds were not satisfied
[INFO] [stdout]    --> src/test.rs:12:50
[INFO] [stdout]     |
[INFO] [stdout] 12  |       let vempty : Vec<u8> = empty.iter().cloned().cloned().collect();
[INFO] [stdout]     |                                                    ^^^^^^ method cannot be called on `Cloned<RcListIter<u8>>` due to unsatisfied trait bounds
[INFO] [stdout]     |
[INFO] [stdout]    ::: src/lib.rs:103:1
[INFO] [stdout]     |
[INFO] [stdout] 103 |   pub struct RcListIter<T: 'static> {
[INFO] [stdout]     |   --------------------------------- doesn't satisfy `<RcListIter<u8> as std::iter::Iterator>::Item = &_`
[INFO] [stdout]     |
[INFO] [stdout] note: the following trait bounds were not satisfied because of the requirements of the implementation of `std::iter::Iterator` for `_`:
[INFO] [stdout]       `<RcListIter<u8> as std::iter::Iterator>::Item = &_`
[INFO] [stdout]       `Cloned<RcListIter<u8>>: std::iter::Iterator`
[INFO] [stdout]    --> src/lib.rs:107:17
[INFO] [stdout]     |
[INFO] [stdout] 107 | impl<T : Clone> Iterator for RcListIter< T> {
[INFO] [stdout]     |                 ^^^^^^^^     ^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0271]: type mismatch resolving `<RcListIter<u8> as std::iter::Iterator>::Item == &_`
[INFO] [stdout]     --> src/test.rs:13:34
[INFO] [stdout]      |
[INFO] [stdout] 13   |     let v1 : Vec<u8> = s1.iter().cloned().cloned().collect();
[INFO] [stdout]      |                                  ^^^^^^ expected reference, found struct `Rc`
[INFO] [stdout]      |
[INFO] [stdout]      = note: expected reference `&_`
[INFO] [stdout]                    found struct `Rc<Node<u8>>`
[INFO] [stdout] note: required by a bound in `cloned`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0599]: the method `cloned` exists for struct `Cloned<RcListIter<u8>>`, but its trait bounds were not satisfied
[INFO] [stdout]    --> src/test.rs:13:43
[INFO] [stdout]     |
[INFO] [stdout] 13  |       let v1 : Vec<u8> = s1.iter().cloned().cloned().collect();
[INFO] [stdout]     |                                             ^^^^^^ method cannot be called on `Cloned<RcListIter<u8>>` due to unsatisfied trait bounds
[INFO] [stdout]     |
[INFO] [stdout]    ::: src/lib.rs:103:1
[INFO] [stdout]     |
[INFO] [stdout] 103 |   pub struct RcListIter<T: 'static> {
[INFO] [stdout]     |   --------------------------------- doesn't satisfy `<RcListIter<u8> as std::iter::Iterator>::Item = &_`
[INFO] [stdout]     |
[INFO] [stdout] note: the following trait bounds were not satisfied because of the requirements of the implementation of `std::iter::Iterator` for `_`:
[INFO] [stdout]       `<RcListIter<u8> as std::iter::Iterator>::Item = &_`
[INFO] [stdout]       `Cloned<RcListIter<u8>>: std::iter::Iterator`
[INFO] [stdout]    --> src/lib.rs:107:17
[INFO] [stdout]     |
[INFO] [stdout] 107 | impl<T : Clone> Iterator for RcListIter< T> {
[INFO] [stdout]     |                 ^^^^^^^^     ^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0271]: type mismatch resolving `<RcListIter<u8> as std::iter::Iterator>::Item == &_`
[INFO] [stdout]     --> src/test.rs:14:34
[INFO] [stdout]      |
[INFO] [stdout] 14   |     let v2 : Vec<u8> = s2.iter().cloned().cloned().collect();
[INFO] [stdout]      |                                  ^^^^^^ expected reference, found struct `Rc`
[INFO] [stdout]      |
[INFO] [stdout]      = note: expected reference `&_`
[INFO] [stdout]                    found struct `Rc<Node<u8>>`
[INFO] [stdout] note: required by a bound in `cloned`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0599]: the method `cloned` exists for struct `Cloned<RcListIter<u8>>`, but its trait bounds were not satisfied
[INFO] [stdout]    --> src/test.rs:14:43
[INFO] [stdout]     |
[INFO] [stdout] 14  |       let v2 : Vec<u8> = s2.iter().cloned().cloned().collect();
[INFO] [stdout]     |                                             ^^^^^^ method cannot be called on `Cloned<RcListIter<u8>>` due to unsatisfied trait bounds
[INFO] [stdout]     |
[INFO] [stdout]    ::: src/lib.rs:103:1
[INFO] [stdout]     |
[INFO] [stdout] 103 |   pub struct RcListIter<T: 'static> {
[INFO] [stdout]     |   --------------------------------- doesn't satisfy `<RcListIter<u8> as std::iter::Iterator>::Item = &_`
[INFO] [stdout]     |
[INFO] [stdout] note: the following trait bounds were not satisfied because of the requirements of the implementation of `std::iter::Iterator` for `_`:
[INFO] [stdout]       `<RcListIter<u8> as std::iter::Iterator>::Item = &_`
[INFO] [stdout]       `Cloned<RcListIter<u8>>: std::iter::Iterator`
[INFO] [stdout]    --> src/lib.rs:107:17
[INFO] [stdout]     |
[INFO] [stdout] 107 | impl<T : Clone> Iterator for RcListIter< T> {
[INFO] [stdout]     |                 ^^^^^^^^     ^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0271]: type mismatch resolving `<RcListIter<&str> as std::iter::Iterator>::Item == &_`
[INFO] [stdout]     --> src/test.rs:30:43
[INFO] [stdout]      |
[INFO] [stdout] 30   |     let vempty : Vec<&str> = empty.iter().cloned().cloned().collect();
[INFO] [stdout]      |                                           ^^^^^^ expected reference, found struct `Rc`
[INFO] [stdout]      |
[INFO] [stdout]      = note: expected reference `&_`
[INFO] [stdout]                    found struct `Rc<Node<&str>>`
[INFO] [stdout] note: required by a bound in `cloned`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0599]: the method `cloned` exists for struct `Cloned<RcListIter<&str>>`, but its trait bounds were not satisfied
[INFO] [stdout]    --> src/test.rs:30:52
[INFO] [stdout]     |
[INFO] [stdout] 30  |       let vempty : Vec<&str> = empty.iter().cloned().cloned().collect();
[INFO] [stdout]     |                                                      ^^^^^^ method cannot be called on `Cloned<RcListIter<&str>>` due to unsatisfied trait bounds
[INFO] [stdout]     |
[INFO] [stdout]    ::: src/lib.rs:103:1
[INFO] [stdout]     |
[INFO] [stdout] 103 |   pub struct RcListIter<T: 'static> {
[INFO] [stdout]     |   --------------------------------- doesn't satisfy `<_ as std::iter::Iterator>::Item = &_`
[INFO] [stdout]     |
[INFO] [stdout] note: the following trait bounds were not satisfied because of the requirements of the implementation of `std::iter::Iterator` for `_`:
[INFO] [stdout]       `<RcListIter<&str> as std::iter::Iterator>::Item = &_`
[INFO] [stdout]       `Cloned<RcListIter<&str>>: std::iter::Iterator`
[INFO] [stdout]    --> src/lib.rs:107:17
[INFO] [stdout]     |
[INFO] [stdout] 107 | impl<T : Clone> Iterator for RcListIter< T> {
[INFO] [stdout]     |                 ^^^^^^^^     ^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0271]: type mismatch resolving `<RcListIter<&str> as std::iter::Iterator>::Item == &_`
[INFO] [stdout]     --> src/test.rs:31:36
[INFO] [stdout]      |
[INFO] [stdout] 31   |     let v1 : Vec<&str> = s1.iter().cloned().cloned().collect();
[INFO] [stdout]      |                                    ^^^^^^ expected reference, found struct `Rc`
[INFO] [stdout]      |
[INFO] [stdout]      = note: expected reference `&_`
[INFO] [stdout]                    found struct `Rc<Node<&str>>`
[INFO] [stdout] note: required by a bound in `cloned`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0599]: the method `cloned` exists for struct `Cloned<RcListIter<&str>>`, but its trait bounds were not satisfied
[INFO] [stdout]    --> src/test.rs:31:45
[INFO] [stdout]     |
[INFO] [stdout] 31  |       let v1 : Vec<&str> = s1.iter().cloned().cloned().collect();
[INFO] [stdout]     |                                               ^^^^^^ method cannot be called on `Cloned<RcListIter<&str>>` due to unsatisfied trait bounds
[INFO] [stdout]     |
[INFO] [stdout]    ::: src/lib.rs:103:1
[INFO] [stdout]     |
[INFO] [stdout] 103 |   pub struct RcListIter<T: 'static> {
[INFO] [stdout]     |   --------------------------------- doesn't satisfy `<_ as std::iter::Iterator>::Item = &_`
[INFO] [stdout]     |
[INFO] [stdout] note: the following trait bounds were not satisfied because of the requirements of the implementation of `std::iter::Iterator` for `_`:
[INFO] [stdout]       `<RcListIter<&str> as std::iter::Iterator>::Item = &_`
[INFO] [stdout]       `Cloned<RcListIter<&str>>: std::iter::Iterator`
[INFO] [stdout]    --> src/lib.rs:107:17
[INFO] [stdout]     |
[INFO] [stdout] 107 | impl<T : Clone> Iterator for RcListIter< T> {
[INFO] [stdout]     |                 ^^^^^^^^     ^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0271]: type mismatch resolving `<RcListIter<&str> as std::iter::Iterator>::Item == &_`
[INFO] [stdout]     --> src/test.rs:32:36
[INFO] [stdout]      |
[INFO] [stdout] 32   |     let v2 : Vec<&str> = s2.iter().cloned().cloned().collect();
[INFO] [stdout]      |                                    ^^^^^^ expected reference, found struct `Rc`
[INFO] [stdout]      |
[INFO] [stdout]      = note: expected reference `&_`
[INFO] [stdout]                    found struct `Rc<Node<&str>>`
[INFO] [stdout] note: required by a bound in `cloned`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0599]: the method `cloned` exists for struct `Cloned<RcListIter<&str>>`, but its trait bounds were not satisfied
[INFO] [stdout]    --> src/test.rs:32:45
[INFO] [stdout]     |
[INFO] [stdout] 32  |       let v2 : Vec<&str> = s2.iter().cloned().cloned().collect();
[INFO] [stdout]     |                                               ^^^^^^ method cannot be called on `Cloned<RcListIter<&str>>` due to unsatisfied trait bounds
[INFO] [stdout]     |
[INFO] [stdout]    ::: src/lib.rs:103:1
[INFO] [stdout]     |
[INFO] [stdout] 103 |   pub struct RcListIter<T: 'static> {
[INFO] [stdout]     |   --------------------------------- doesn't satisfy `<_ as std::iter::Iterator>::Item = &_`
[INFO] [stdout]     |
[INFO] [stdout] note: the following trait bounds were not satisfied because of the requirements of the implementation of `std::iter::Iterator` for `_`:
[INFO] [stdout]       `<RcListIter<&str> as std::iter::Iterator>::Item = &_`
[INFO] [stdout]       `Cloned<RcListIter<&str>>: std::iter::Iterator`
[INFO] [stdout]    --> src/lib.rs:107:17
[INFO] [stdout]     |
[INFO] [stdout] 107 | impl<T : Clone> Iterator for RcListIter< T> {
[INFO] [stdout]     |                 ^^^^^^^^     ^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0271]: type mismatch resolving `<RcListIter<String> as std::iter::Iterator>::Item == &_`
[INFO] [stdout]     --> src/test.rs:49:45
[INFO] [stdout]      |
[INFO] [stdout] 49   |     let vempty : Vec<String> = empty.iter().cloned().cloned().collect();
[INFO] [stdout]      |                                             ^^^^^^ expected reference, found struct `Rc`
[INFO] [stdout]      |
[INFO] [stdout]      = note: expected reference `&_`
[INFO] [stdout]                    found struct `Rc<Node<String>>`
[INFO] [stdout] note: required by a bound in `cloned`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0599]: the method `cloned` exists for struct `Cloned<RcListIter<String>>`, but its trait bounds were not satisfied
[INFO] [stdout]    --> src/test.rs:49:54
[INFO] [stdout]     |
[INFO] [stdout] 49  |       let vempty : Vec<String> = empty.iter().cloned().cloned().collect();
[INFO] [stdout]     |                                                        ^^^^^^ method cannot be called on `Cloned<RcListIter<String>>` due to unsatisfied trait bounds
[INFO] [stdout]     |
[INFO] [stdout]    ::: src/lib.rs:103:1
[INFO] [stdout]     |
[INFO] [stdout] 103 |   pub struct RcListIter<T: 'static> {
[INFO] [stdout]     |   --------------------------------- doesn't satisfy `<_ as std::iter::Iterator>::Item = &_`
[INFO] [stdout]     |
[INFO] [stdout] note: the following trait bounds were not satisfied because of the requirements of the implementation of `std::iter::Iterator` for `_`:
[INFO] [stdout]       `<RcListIter<String> as std::iter::Iterator>::Item = &_`
[INFO] [stdout]       `Cloned<RcListIter<String>>: std::iter::Iterator`
[INFO] [stdout]    --> src/lib.rs:107:17
[INFO] [stdout]     |
[INFO] [stdout] 107 | impl<T : Clone> Iterator for RcListIter< T> {
[INFO] [stdout]     |                 ^^^^^^^^     ^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0271]: type mismatch resolving `<RcListIter<String> as std::iter::Iterator>::Item == &_`
[INFO] [stdout]     --> src/test.rs:50:38
[INFO] [stdout]      |
[INFO] [stdout] 50   |     let v1 : Vec<String> = s1.iter().cloned().cloned().collect();
[INFO] [stdout]      |                                      ^^^^^^ expected reference, found struct `Rc`
[INFO] [stdout]      |
[INFO] [stdout]      = note: expected reference `&_`
[INFO] [stdout]                    found struct `Rc<Node<String>>`
[INFO] [stdout] note: required by a bound in `cloned`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0599]: the method `cloned` exists for struct `Cloned<RcListIter<String>>`, but its trait bounds were not satisfied
[INFO] [stdout]    --> src/test.rs:50:47
[INFO] [stdout]     |
[INFO] [stdout] 50  |       let v1 : Vec<String> = s1.iter().cloned().cloned().collect();
[INFO] [stdout]     |                                                 ^^^^^^ method cannot be called on `Cloned<RcListIter<String>>` due to unsatisfied trait bounds
[INFO] [stdout]     |
[INFO] [stdout]    ::: src/lib.rs:103:1
[INFO] [stdout]     |
[INFO] [stdout] 103 |   pub struct RcListIter<T: 'static> {
[INFO] [stdout]     |   --------------------------------- doesn't satisfy `<_ as std::iter::Iterator>::Item = &_`
[INFO] [stdout]     |
[INFO] [stdout] note: the following trait bounds were not satisfied because of the requirements of the implementation of `std::iter::Iterator` for `_`:
[INFO] [stdout]       `<RcListIter<String> as std::iter::Iterator>::Item = &_`
[INFO] [stdout]       `Cloned<RcListIter<String>>: std::iter::Iterator`
[INFO] [stdout]    --> src/lib.rs:107:17
[INFO] [stdout]     |
[INFO] [stdout] 107 | impl<T : Clone> Iterator for RcListIter< T> {
[INFO] [stdout]     |                 ^^^^^^^^     ^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0271]: type mismatch resolving `<RcListIter<String> as std::iter::Iterator>::Item == &_`
[INFO] [stdout]     --> src/test.rs:51:38
[INFO] [stdout]      |
[INFO] [stdout] 51   |     let v2 : Vec<String> = s2.iter().cloned().cloned().collect();
[INFO] [stdout]      |                                      ^^^^^^ expected reference, found struct `Rc`
[INFO] [stdout]      |
[INFO] [stdout]      = note: expected reference `&_`
[INFO] [stdout]                    found struct `Rc<Node<String>>`
[INFO] [stdout] note: required by a bound in `cloned`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0599]: the method `cloned` exists for struct `Cloned<RcListIter<String>>`, but its trait bounds were not satisfied
[INFO] [stdout]    --> src/test.rs:51:47
[INFO] [stdout]     |
[INFO] [stdout] 51  |       let v2 : Vec<String> = s2.iter().cloned().cloned().collect();
[INFO] [stdout]     |                                                 ^^^^^^ method cannot be called on `Cloned<RcListIter<String>>` due to unsatisfied trait bounds
[INFO] [stdout]     |
[INFO] [stdout]    ::: src/lib.rs:103:1
[INFO] [stdout]     |
[INFO] [stdout] 103 |   pub struct RcListIter<T: 'static> {
[INFO] [stdout]     |   --------------------------------- doesn't satisfy `<_ as std::iter::Iterator>::Item = &_`
[INFO] [stdout]     |
[INFO] [stdout] note: the following trait bounds were not satisfied because of the requirements of the implementation of `std::iter::Iterator` for `_`:
[INFO] [stdout]       `<RcListIter<String> as std::iter::Iterator>::Item = &_`
[INFO] [stdout]       `Cloned<RcListIter<String>>: std::iter::Iterator`
[INFO] [stdout]    --> src/lib.rs:107:17
[INFO] [stdout]     |
[INFO] [stdout] 107 | impl<T : Clone> Iterator for RcListIter< T> {
[INFO] [stdout]     |                 ^^^^^^^^     ^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0271]: type mismatch resolving `<RcListIter<u8> as std::iter::Iterator>::Item == &_`
[INFO] [stdout]     --> src/test.rs:74:34
[INFO] [stdout]      |
[INFO] [stdout] 74   |     let v1 : Vec<u8> = s1.iter().cloned().cloned().collect();
[INFO] [stdout]      |                                  ^^^^^^ expected reference, found struct `Rc`
[INFO] [stdout]      |
[INFO] [stdout]      = note: expected reference `&_`
[INFO] [stdout]                    found struct `Rc<Node<u8>>`
[INFO] [stdout] note: required by a bound in `cloned`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0599]: the method `cloned` exists for struct `Cloned<RcListIter<u8>>`, but its trait bounds were not satisfied
[INFO] [stdout]    --> src/test.rs:74:43
[INFO] [stdout]     |
[INFO] [stdout] 74  |       let v1 : Vec<u8> = s1.iter().cloned().cloned().collect();
[INFO] [stdout]     |                                             ^^^^^^ method cannot be called on `Cloned<RcListIter<u8>>` due to unsatisfied trait bounds
[INFO] [stdout]     |
[INFO] [stdout]    ::: src/lib.rs:103:1
[INFO] [stdout]     |
[INFO] [stdout] 103 |   pub struct RcListIter<T: 'static> {
[INFO] [stdout]     |   --------------------------------- doesn't satisfy `<RcListIter<u8> as std::iter::Iterator>::Item = &_`
[INFO] [stdout]     |
[INFO] [stdout] note: the following trait bounds were not satisfied because of the requirements of the implementation of `std::iter::Iterator` for `_`:
[INFO] [stdout]       `<RcListIter<u8> as std::iter::Iterator>::Item = &_`
[INFO] [stdout]       `Cloned<RcListIter<u8>>: std::iter::Iterator`
[INFO] [stdout]    --> src/lib.rs:107:17
[INFO] [stdout]     |
[INFO] [stdout] 107 | impl<T : Clone> Iterator for RcListIter< T> {
[INFO] [stdout]     |                 ^^^^^^^^     ^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0271]: type mismatch resolving `<RcListIter<u8> as std::iter::Iterator>::Item == &_`
[INFO] [stdout]     --> src/test.rs:75:34
[INFO] [stdout]      |
[INFO] [stdout] 75   |     let v2 : Vec<u8> = s2.iter().cloned().cloned().collect();
[INFO] [stdout]      |                                  ^^^^^^ expected reference, found struct `Rc`
[INFO] [stdout]      |
[INFO] [stdout]      = note: expected reference `&_`
[INFO] [stdout]                    found struct `Rc<Node<u8>>`
[INFO] [stdout] note: required by a bound in `cloned`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0599]: the method `cloned` exists for struct `Cloned<RcListIter<u8>>`, but its trait bounds were not satisfied
[INFO] [stdout]    --> src/test.rs:75:43
[INFO] [stdout]     |
[INFO] [stdout] 75  |       let v2 : Vec<u8> = s2.iter().cloned().cloned().collect();
[INFO] [stdout]     |                                             ^^^^^^ method cannot be called on `Cloned<RcListIter<u8>>` due to unsatisfied trait bounds
[INFO] [stdout]     |
[INFO] [stdout]    ::: src/lib.rs:103:1
[INFO] [stdout]     |
[INFO] [stdout] 103 |   pub struct RcListIter<T: 'static> {
[INFO] [stdout]     |   --------------------------------- doesn't satisfy `<RcListIter<u8> as std::iter::Iterator>::Item = &_`
[INFO] [stdout]     |
[INFO] [stdout] note: the following trait bounds were not satisfied because of the requirements of the implementation of `std::iter::Iterator` for `_`:
[INFO] [stdout]       `<RcListIter<u8> as std::iter::Iterator>::Item = &_`
[INFO] [stdout]       `Cloned<RcListIter<u8>>: std::iter::Iterator`
[INFO] [stdout]    --> src/lib.rs:107:17
[INFO] [stdout]     |
[INFO] [stdout] 107 | impl<T : Clone> Iterator for RcListIter< T> {
[INFO] [stdout]     |                 ^^^^^^^^     ^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: aborting due to 23 previous errors
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] Some errors have detailed explanations: E0271, E0599.
[INFO] [stdout] 
[INFO] [stdout] For more information about an error, try `rustc --explain E0271`.
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `rclist` due to 24 previous errors
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[INFO] [stdout] error[E0599]: no method named `downgrade` found for reference `&Rc<T>` in the current scope
[INFO] [stdout]   --> src/lib.rs:31:50
[INFO] [stdout]    |
[INFO] [stdout] 31 |             &Link::Strong(ref x) => Link::Weak(x.downgrade()),
[INFO] [stdout]    |                                                --^^^^^^^^^
[INFO] [stdout]    |                                                | |
[INFO] [stdout]    |                                                | this is an associated function, not a method
[INFO] [stdout]    |                                                help: use associated function syntax instead: `Rc::<T>::downgrade`
[INFO] [stdout]    |
[INFO] [stdout]    = note: found the following associated functions; to be used as methods, functions must have a `self` parameter
[INFO] [stdout]    = note: the candidate is defined in an impl for the type `Rc<T>`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: aborting due to previous error
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] For more information about this error, try `rustc --explain E0599`.
[INFO] [stdout] 
[INFO] [stderr] error: build failed
[INFO] running `Command { std: "docker" "inspect" "5b3074fa577be65262ce109b20937b004adb782680e7430eecd24c5251ec4507", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "5b3074fa577be65262ce109b20937b004adb782680e7430eecd24c5251ec4507", kill_on_drop: false }`
[INFO] [stdout] 5b3074fa577be65262ce109b20937b004adb782680e7430eecd24c5251ec4507