[INFO] fetching crate hi-tension 0.1.0...
[INFO] testing hi-tension-0.1.0 against 1.54.0 for beta-1.55-1
[INFO] extracting crate hi-tension 0.1.0 into /workspace/builds/worker-50/source
[INFO] validating manifest of crates.io crate hi-tension 0.1.0 on toolchain 1.54.0
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.54.0" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking crates.io crate hi-tension 0.1.0
[INFO] finished tweaking crates.io crate hi-tension 0.1.0
[INFO] tweaked toml for crates.io crate hi-tension 0.1.0 written to /workspace/builds/worker-50/source/Cargo.toml
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.54.0" "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" "+1.54.0" "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-50/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-50/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@sha256:34b6a614d2c27851fe6cbf88fbd1137609cefab8b10d0615aaeb6fd47975d74e" "/opt/rustwide/cargo-home/bin/cargo" "+1.54.0" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
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[INFO] [stdout] d0c25b08055afed755eb5c59a257f555af13c909f4c0143e98d35779929f3735
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[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]    Compiling hi-tension v0.1.0 (/opt/rustwide/workdir)
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 7.46s
[INFO] running `Command { std: "docker" "inspect" "d0c25b08055afed755eb5c59a257f555af13c909f4c0143e98d35779929f3735", kill_on_drop: false }`
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[INFO] [stdout] d0c25b08055afed755eb5c59a257f555af13c909f4c0143e98d35779929f3735
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-50/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-50/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@sha256:34b6a614d2c27851fe6cbf88fbd1137609cefab8b10d0615aaeb6fd47975d74e" "/opt/rustwide/cargo-home/bin/cargo" "+1.54.0" "test" "--frozen" "--no-run" "--message-format=json", kill_on_drop: false }`
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[INFO] [stderr]    Compiling hi-tension v0.1.0 (/opt/rustwide/workdir)
[INFO] [stderr]     Finished test [unoptimized + debuginfo] target(s) in 0.59s
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[INFO] running `Command { std: "docker" "rm" "-f" "0937091a2070821925df4f12c3396eed23fc287a0824ba7cf2ed70e90303f608", kill_on_drop: false }`
[INFO] [stdout] 0937091a2070821925df4f12c3396eed23fc287a0824ba7cf2ed70e90303f608
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-50/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-50/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@sha256:34b6a614d2c27851fe6cbf88fbd1137609cefab8b10d0615aaeb6fd47975d74e" "/opt/rustwide/cargo-home/bin/cargo" "+1.54.0" "test" "--frozen", kill_on_drop: false }`
[INFO] [stdout] 666d5ebe14b8518e738cb502aeddeb64274d7c51f2414486889dd926c90ca402
[INFO] running `Command { std: "docker" "start" "-a" "666d5ebe14b8518e738cb502aeddeb64274d7c51f2414486889dd926c90ca402", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]     Finished test [unoptimized + debuginfo] target(s) in 0.12s
[INFO] [stderr]      Running unittests (/opt/rustwide/target/debug/deps/hi_tension-f6e814475f6c80cc)
[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]    Doc-tests hi-tension
[INFO] [stdout] 
[INFO] [stdout] running 4 tests
[INFO] [stdout] test src/lib.rs - hiread (line 97) - compile ... FAILED
[INFO] [stdout] test src/lib.rs - hidelimiter (line 186) - compile ... FAILED
[INFO] [stdout] test src/lib.rs - (line 8) ... FAILED
[INFO] [stdout] test src/lib.rs - hiwrite (line 143) - compile ... FAILED
[INFO] [stdout] 
[INFO] [stdout] failures:
[INFO] [stdout] 
[INFO] [stdout] ---- src/lib.rs - hiread (line 97) stdout ----
[INFO] [stdout] error: expected `;`, found keyword `let`
[INFO] [stdout]  --> src/lib.rs:99:51
[INFO] [stdout]   |
[INFO] [stdout] 4 | let stream = TcpStream::connect("127.0.0.1:34567")
[INFO] [stdout]   |                                                   ^ help: add `;` here
[INFO] [stdout] 5 | 
[INFO] [stdout] 6 | let data = hiread(&mut stream);
[INFO] [stdout]   | --- unexpected token
[INFO] [stdout] 
[INFO] [stdout] error[E0425]: cannot find function `hiread` in this scope
[INFO] [stdout]  --> src/lib.rs:101:12
[INFO] [stdout]   |
[INFO] [stdout] 6 | let data = hiread(&mut stream);
[INFO] [stdout]   |            ^^^^^^ not found in this scope
[INFO] [stdout]   |
[INFO] [stdout] help: consider importing this function
[INFO] [stdout]   |
[INFO] [stdout] 2 | use hi_tension::hiread;
[INFO] [stdout]   |
[INFO] [stdout] 
[INFO] [stdout] error: aborting due to 2 previous errors
[INFO] [stdout] 
[INFO] [stdout] For more information about this error, try `rustc --explain E0425`.
[INFO] [stdout] Couldn't compile the test.
[INFO] [stdout] ---- src/lib.rs - hidelimiter (line 186) stdout ----
[INFO] [stdout] error: expected `;`, found keyword `let`
[INFO] [stdout]  --> src/lib.rs:188:51
[INFO] [stdout]   |
[INFO] [stdout] 4 | let stream = TcpStream::connect("127.0.0.1:34567")
[INFO] [stdout]   |                                                   ^ help: add `;` here
[INFO] [stdout] 5 | 
[INFO] [stdout] 6 | let data = vec![0.0; 1_000_000]; // 8 MB
[INFO] [stdout]   | --- unexpected token
[INFO] [stdout] 
[INFO] [stdout] error[E0425]: cannot find function `hiwrite` in this scope
[INFO] [stdout]  --> src/lib.rs:192:1
[INFO] [stdout]   |
[INFO] [stdout] 8 | hiwrite(&mut stream, &data)?;
[INFO] [stdout]   | ^^^^^^^ not found in this scope
[INFO] [stdout]   |
[INFO] [stdout] help: consider importing this function
[INFO] [stdout]   |
[INFO] [stdout] 2 | use hi_tension::hiwrite;
[INFO] [stdout]   |
[INFO] [stdout] 
[INFO] [stdout] error[E0425]: cannot find function `hidelimiter` in this scope
[INFO] [stdout]  --> src/lib.rs:193:1
[INFO] [stdout]   |
[INFO] [stdout] 9 | hidelimiter(&mut stream);
[INFO] [stdout]   | ^^^^^^^^^^^ not found in this scope
[INFO] [stdout]   |
[INFO] [stdout] help: consider importing this function
[INFO] [stdout]   |
[INFO] [stdout] 2 | use hi_tension::hidelimiter;
[INFO] [stdout]   |
[INFO] [stdout] 
[INFO] [stdout] error[E0277]: the `?` operator can only be used in a function that returns `Result` or `Option` (or another type that implements `FromResidual`)
[INFO] [stdout]   --> src/lib.rs:192:28
[INFO] [stdout]    |
[INFO] [stdout] 2  |   fn main() { #[allow(non_snake_case)] fn _doctest_main_src_lib_rs_186_0() {
[INFO] [stdout]    |  ______________________________________-
[INFO] [stdout] 3  | | use std::net::TcpStream;
[INFO] [stdout] 4  | | let stream = TcpStream::connect("127.0.0.1:34567")
[INFO] [stdout] 5  | |
[INFO] [stdout] ...  |
[INFO] [stdout] 8  | | hiwrite(&mut stream, &data)?;
[INFO] [stdout]    | |                            ^ cannot use the `?` operator in a function that returns `()`
[INFO] [stdout] 9  | | hidelimiter(&mut stream);
[INFO] [stdout] 10 | | } _doctest_main_src_lib_rs_186_0() }
[INFO] [stdout]    | |_- this function should return `Result` or `Option` to accept `?`
[INFO] [stdout]    |
[INFO] [stdout]    = help: the trait `FromResidual<_>` is not implemented for `()`
[INFO] [stdout]    = note: required by `from_residual`
[INFO] [stdout] 
[INFO] [stdout] error: aborting due to 4 previous errors
[INFO] [stdout] 
[INFO] [stdout] Some errors have detailed explanations: E0277, E0425.
[INFO] [stdout] For more information about an error, try `rustc --explain E0277`.
[INFO] [stdout] Couldn't compile the test.
[INFO] [stdout] ---- src/lib.rs - (line 8) stdout ----
[INFO] [stdout] error[E0277]: the trait bound `Result<TcpStream, std::io::Error>: std::io::Write` is not satisfied
[INFO] [stdout]    --> src/lib.rs:25:1
[INFO] [stdout]     |
[INFO] [stdout] 20  | hiwrite(&mut stream, &data)?;
[INFO] [stdout]     | ^^^^^^^ the trait `std::io::Write` is not implemented for `Result<TcpStream, std::io::Error>`
[INFO] [stdout]     | 
[INFO] [stdout]    ::: /opt/rustwide/workdir/src/lib.rs:159:19
[INFO] [stdout]     |
[INFO] [stdout] 159 | pub fn hiwrite<W: Write>(stream: &mut W, data: &[f64]) -> Result<()> {
[INFO] [stdout]     |                   ----- required by this bound in `hiwrite`
[INFO] [stdout] 
[INFO] [stdout] error[E0277]: the `?` operator can only be used in a function that returns `Result` or `Option` (or another type that implements `FromResidual`)
[INFO] [stdout]   --> src/lib.rs:25:28
[INFO] [stdout]    |
[INFO] [stdout] 3  |   fn main() { #[allow(non_snake_case)] fn _doctest_main_src_lib_rs_8_0() {
[INFO] [stdout]    |  ______________________________________-
[INFO] [stdout] 4  | | use hi_tension::{hiread, hiwrite, hidelimiter};
[INFO] [stdout] 5  | |
[INFO] [stdout] 6  | | // Here we use a TcpStream but anything implementing Read and Write will do
[INFO] [stdout] ...  |
[INFO] [stdout] 20 | | hiwrite(&mut stream, &data)?;
[INFO] [stdout]    | |                            ^ cannot use the `?` operator in a function that returns `()`
[INFO] [stdout] ...  |
[INFO] [stdout] 31 | | let vec = hiread(&mut stream)?;
[INFO] [stdout] 32 | | } _doctest_main_src_lib_rs_8_0() }
[INFO] [stdout]    | |_- this function should return `Result` or `Option` to accept `?`
[INFO] [stdout]    |
[INFO] [stdout]    = help: the trait `FromResidual<Result<Infallible, std::io::Error>>` is not implemented for `()`
[INFO] [stdout]    = note: required by `from_residual`
[INFO] [stdout] 
[INFO] [stdout] error[E0277]: the trait bound `Result<TcpStream, std::io::Error>: std::io::Read` is not satisfied
[INFO] [stdout]    --> src/lib.rs:26:13
[INFO] [stdout]     |
[INFO] [stdout] 21  | hidelimiter(&mut stream);
[INFO] [stdout]     |             ^^^^^^^^^^^ the trait `std::io::Read` is not implemented for `Result<TcpStream, std::io::Error>`
[INFO] [stdout]     | 
[INFO] [stdout]    ::: /opt/rustwide/workdir/src/lib.rs:195:23
[INFO] [stdout]     |
[INFO] [stdout] 195 | pub fn hidelimiter<S: Read + Write>(stream: &mut S) -> Result<()> {
[INFO] [stdout]     |                       ---- required by this bound in `hidelimiter`
[INFO] [stdout] 
[INFO] [stdout] error[E0277]: the trait bound `Result<TcpStream, std::io::Error>: std::io::Write` is not satisfied
[INFO] [stdout]    --> src/lib.rs:26:13
[INFO] [stdout]     |
[INFO] [stdout] 21  | hidelimiter(&mut stream);
[INFO] [stdout]     |             ^^^^^^^^^^^ the trait `std::io::Write` is not implemented for `Result<TcpStream, std::io::Error>`
[INFO] [stdout]     | 
[INFO] [stdout]    ::: /opt/rustwide/workdir/src/lib.rs:195:30
[INFO] [stdout]     |
[INFO] [stdout] 195 | pub fn hidelimiter<S: Read + Write>(stream: &mut S) -> Result<()> {
[INFO] [stdout]     |                              ----- required by this bound in `hidelimiter`
[INFO] [stdout] 
[INFO] [stdout] error[E0277]: the trait bound `Result<TcpStream, std::io::Error>: std::io::Write` is not satisfied
[INFO] [stdout]    --> src/lib.rs:29:1
[INFO] [stdout]     |
[INFO] [stdout] 24  | hiwrite(&mut stream, &data[..500_000])?;
[INFO] [stdout]     | ^^^^^^^ the trait `std::io::Write` is not implemented for `Result<TcpStream, std::io::Error>`
[INFO] [stdout]     | 
[INFO] [stdout]    ::: /opt/rustwide/workdir/src/lib.rs:159:19
[INFO] [stdout]     |
[INFO] [stdout] 159 | pub fn hiwrite<W: Write>(stream: &mut W, data: &[f64]) -> Result<()> {
[INFO] [stdout]     |                   ----- required by this bound in `hiwrite`
[INFO] [stdout] 
[INFO] [stdout] error[E0277]: the `?` operator can only be used in a function that returns `Result` or `Option` (or another type that implements `FromResidual`)
[INFO] [stdout]   --> src/lib.rs:29:39
[INFO] [stdout]    |
[INFO] [stdout] 3  |   fn main() { #[allow(non_snake_case)] fn _doctest_main_src_lib_rs_8_0() {
[INFO] [stdout]    |  ______________________________________-
[INFO] [stdout] 4  | | use hi_tension::{hiread, hiwrite, hidelimiter};
[INFO] [stdout] 5  | |
[INFO] [stdout] 6  | | // Here we use a TcpStream but anything implementing Read and Write will do
[INFO] [stdout] ...  |
[INFO] [stdout] 24 | | hiwrite(&mut stream, &data[..500_000])?;
[INFO] [stdout]    | |                                       ^ cannot use the `?` operator in a function that returns `()`
[INFO] [stdout] ...  |
[INFO] [stdout] 31 | | let vec = hiread(&mut stream)?;
[INFO] [stdout] 32 | | } _doctest_main_src_lib_rs_8_0() }
[INFO] [stdout]    | |_- this function should return `Result` or `Option` to accept `?`
[INFO] [stdout]    |
[INFO] [stdout]    = help: the trait `FromResidual<Result<Infallible, std::io::Error>>` is not implemented for `()`
[INFO] [stdout]    = note: required by `from_residual`
[INFO] [stdout] 
[INFO] [stdout] error[E0277]: the trait bound `Result<TcpStream, std::io::Error>: std::io::Write` is not satisfied
[INFO] [stdout]    --> src/lib.rs:30:1
[INFO] [stdout]     |
[INFO] [stdout] 25  | hiwrite(&mut stream, &data[500_000..])?;
[INFO] [stdout]     | ^^^^^^^ the trait `std::io::Write` is not implemented for `Result<TcpStream, std::io::Error>`
[INFO] [stdout]     | 
[INFO] [stdout]    ::: /opt/rustwide/workdir/src/lib.rs:159:19
[INFO] [stdout]     |
[INFO] [stdout] 159 | pub fn hiwrite<W: Write>(stream: &mut W, data: &[f64]) -> Result<()> {
[INFO] [stdout]     |                   ----- required by this bound in `hiwrite`
[INFO] [stdout] 
[INFO] [stdout] error[E0277]: the `?` operator can only be used in a function that returns `Result` or `Option` (or another type that implements `FromResidual`)
[INFO] [stdout]   --> src/lib.rs:30:39
[INFO] [stdout]    |
[INFO] [stdout] 3  |   fn main() { #[allow(non_snake_case)] fn _doctest_main_src_lib_rs_8_0() {
[INFO] [stdout]    |  ______________________________________-
[INFO] [stdout] 4  | | use hi_tension::{hiread, hiwrite, hidelimiter};
[INFO] [stdout] 5  | |
[INFO] [stdout] 6  | | // Here we use a TcpStream but anything implementing Read and Write will do
[INFO] [stdout] ...  |
[INFO] [stdout] 25 | | hiwrite(&mut stream, &data[500_000..])?;
[INFO] [stdout]    | |                                       ^ cannot use the `?` operator in a function that returns `()`
[INFO] [stdout] ...  |
[INFO] [stdout] 31 | | let vec = hiread(&mut stream)?;
[INFO] [stdout] 32 | | } _doctest_main_src_lib_rs_8_0() }
[INFO] [stdout]    | |_- this function should return `Result` or `Option` to accept `?`
[INFO] [stdout]    |
[INFO] [stdout]    = help: the trait `FromResidual<Result<Infallible, std::io::Error>>` is not implemented for `()`
[INFO] [stdout]    = note: required by `from_residual`
[INFO] [stdout] 
[INFO] [stdout] error[E0277]: the trait bound `Result<TcpStream, std::io::Error>: std::io::Read` is not satisfied
[INFO] [stdout]    --> src/lib.rs:31:13
[INFO] [stdout]     |
[INFO] [stdout] 26  | hidelimiter(&mut stream);
[INFO] [stdout]     |             ^^^^^^^^^^^ the trait `std::io::Read` is not implemented for `Result<TcpStream, std::io::Error>`
[INFO] [stdout]     | 
[INFO] [stdout]    ::: /opt/rustwide/workdir/src/lib.rs:195:23
[INFO] [stdout]     |
[INFO] [stdout] 195 | pub fn hidelimiter<S: Read + Write>(stream: &mut S) -> Result<()> {
[INFO] [stdout]     |                       ---- required by this bound in `hidelimiter`
[INFO] [stdout] 
[INFO] [stdout] error[E0277]: the trait bound `Result<TcpStream, std::io::Error>: std::io::Write` is not satisfied
[INFO] [stdout]    --> src/lib.rs:31:13
[INFO] [stdout]     |
[INFO] [stdout] 26  | hidelimiter(&mut stream);
[INFO] [stdout]     |             ^^^^^^^^^^^ the trait `std::io::Write` is not implemented for `Result<TcpStream, std::io::Error>`
[INFO] [stdout]     | 
[INFO] [stdout]    ::: /opt/rustwide/workdir/src/lib.rs:195:30
[INFO] [stdout]     |
[INFO] [stdout] 195 | pub fn hidelimiter<S: Read + Write>(stream: &mut S) -> Result<()> {
[INFO] [stdout]     |                              ----- required by this bound in `hidelimiter`
[INFO] [stdout] 
[INFO] [stdout] error[E0277]: the trait bound `Result<TcpStream, std::io::Error>: std::io::Read` is not satisfied
[INFO] [stdout]    --> src/lib.rs:36:18
[INFO] [stdout]     |
[INFO] [stdout] 31  | let vec = hiread(&mut stream)?;
[INFO] [stdout]     |                  ^^^^^^^^^^^ the trait `std::io::Read` is not implemented for `Result<TcpStream, std::io::Error>`
[INFO] [stdout]     | 
[INFO] [stdout]    ::: /opt/rustwide/workdir/src/lib.rs:103:18
[INFO] [stdout]     |
[INFO] [stdout] 103 | pub fn hiread<S: Read + Write>(stream: &mut S) -> Result<Vec<f64>> {
[INFO] [stdout]     |                  ---- required by this bound in `hiread`
[INFO] [stdout] 
[INFO] [stdout] error[E0277]: the trait bound `Result<TcpStream, std::io::Error>: std::io::Write` is not satisfied
[INFO] [stdout]    --> src/lib.rs:36:18
[INFO] [stdout]     |
[INFO] [stdout] 31  | let vec = hiread(&mut stream)?;
[INFO] [stdout]     |                  ^^^^^^^^^^^ the trait `std::io::Write` is not implemented for `Result<TcpStream, std::io::Error>`
[INFO] [stdout]     | 
[INFO] [stdout]    ::: /opt/rustwide/workdir/src/lib.rs:103:25
[INFO] [stdout]     |
[INFO] [stdout] 103 | pub fn hiread<S: Read + Write>(stream: &mut S) -> Result<Vec<f64>> {
[INFO] [stdout]     |                         ----- required by this bound in `hiread`
[INFO] [stdout] 
[INFO] [stdout] error[E0277]: the `?` operator can only be used in a function that returns `Result` or `Option` (or another type that implements `FromResidual`)
[INFO] [stdout]   --> src/lib.rs:36:30
[INFO] [stdout]    |
[INFO] [stdout] 3  |   fn main() { #[allow(non_snake_case)] fn _doctest_main_src_lib_rs_8_0() {
[INFO] [stdout]    |  ______________________________________-
[INFO] [stdout] 4  | | use hi_tension::{hiread, hiwrite, hidelimiter};
[INFO] [stdout] 5  | |
[INFO] [stdout] 6  | | // Here we use a TcpStream but anything implementing Read and Write will do
[INFO] [stdout] ...  |
[INFO] [stdout] 31 | | let vec = hiread(&mut stream)?;
[INFO] [stdout]    | |                              ^ cannot use the `?` operator in a function that returns `()`
[INFO] [stdout] 32 | | } _doctest_main_src_lib_rs_8_0() }
[INFO] [stdout]    | |_- this function should return `Result` or `Option` to accept `?`
[INFO] [stdout]    |
[INFO] [stdout]    = help: the trait `FromResidual<Result<Infallible, std::io::Error>>` is not implemented for `()`
[INFO] [stdout]    = note: required by `from_residual`
[INFO] [stdout] 
[INFO] [stdout] error: aborting due to 13 previous errors
[INFO] [stdout] 
[INFO] [stdout] For more information about this error, try `rustc --explain E0277`.
[INFO] [stdout] Couldn't compile the test.
[INFO] [stdout] ---- src/lib.rs - hiwrite (line 143) stdout ----
[INFO] [stdout] error: expected `;`, found keyword `let`
[INFO] [stdout]  --> src/lib.rs:145:51
[INFO] [stdout]   |
[INFO] [stdout] 4 | let stream = TcpStream::connect("127.0.0.1:34567")
[INFO] [stdout]   |                                                   ^ help: add `;` here
[INFO] [stdout] 5 | 
[INFO] [stdout] 6 | let data = vec![0.0; 1_000_000]; // 8 MB
[INFO] [stdout]   | --- unexpected token
[INFO] [stdout] 
[INFO] [stdout] error[E0425]: cannot find function `hiwrite` in this scope
[INFO] [stdout]   --> src/lib.rs:151:1
[INFO] [stdout]    |
[INFO] [stdout] 10 | hiwrite(&mut stream, &data)?;
[INFO] [stdout]    | ^^^^^^^ not found in this scope
[INFO] [stdout]    |
[INFO] [stdout] help: consider importing this function
[INFO] [stdout]    |
[INFO] [stdout] 2  | use hi_tension::hiwrite;
[INFO] [stdout]    |
[INFO] [stdout] 
[INFO] [stdout] error[E0425]: cannot find function `hidelimiter` in this scope
[INFO] [stdout]   --> src/lib.rs:152:1
[INFO] [stdout]    |
[INFO] [stdout] 11 | hidelimiter(&mut stream);
[INFO] [stdout]    | ^^^^^^^^^^^ not found in this scope
[INFO] [stdout]    |
[INFO] [stdout] help: consider importing this function
[INFO] [stdout]    |
[INFO] [stdout] 2  | use hi_tension::hidelimiter;
[INFO] [stdout]    |
[INFO] [stdout] 
[INFO] [stdout] error[E0425]: cannot find function `hiwrite` in this scope
[INFO] [stdout]   --> src/lib.rs:155:1
[INFO] [stdout]    |
[INFO] [stdout] 14 | hiwrite(&mut stream, &data[..500_000])?;
[INFO] [stdout]    | ^^^^^^^ not found in this scope
[INFO] [stdout]    |
[INFO] [stdout] help: consider importing this function
[INFO] [stdout]    |
[INFO] [stdout] 2  | use hi_tension::hiwrite;
[INFO] [stdout]    |
[INFO] [stdout] 
[INFO] [stdout] error[E0425]: cannot find function `hiwrite` in this scope
[INFO] [stdout]   --> src/lib.rs:156:1
[INFO] [stdout]    |
[INFO] [stdout] 15 | hiwrite(&mut stream, &data[500_000..])?;
[INFO] [stdout]    | ^^^^^^^ not found in this scope
[INFO] [stdout]    |
[INFO] [stdout] help: consider importing this function
[INFO] [stdout]    |
[INFO] [stdout] 2  | use hi_tension::hiwrite;
[INFO] [stdout]    |
[INFO] [stdout] 
[INFO] [stdout] error[E0425]: cannot find function `hidelimiter` in this scope
[INFO] [stdout]   --> src/lib.rs:157:1
[INFO] [stdout]    |
[INFO] [stdout] 16 | hidelimiter(&mut stream);
[INFO] [stdout]    | ^^^^^^^^^^^ not found in this scope
[INFO] [stdout]    |
[INFO] [stdout] help: consider importing this function
[INFO] [stdout]    |
[INFO] [stdout] 2  | use hi_tension::hidelimiter;
[INFO] [stdout]    |
[INFO] [stdout] 
[INFO] [stdout] error[E0277]: the `?` operator can only be used in a function that returns `Result` or `Option` (or another type that implements `FromResidual`)
[INFO] [stdout]   --> src/lib.rs:151:28
[INFO] [stdout]    |
[INFO] [stdout] 2  |   fn main() { #[allow(non_snake_case)] fn _doctest_main_src_lib_rs_143_0() {
[INFO] [stdout]    |  ______________________________________-
[INFO] [stdout] 3  | | use std::net::TcpStream;
[INFO] [stdout] 4  | | let stream = TcpStream::connect("127.0.0.1:34567")
[INFO] [stdout] 5  | |
[INFO] [stdout] ...  |
[INFO] [stdout] 10 | | hiwrite(&mut stream, &data)?;
[INFO] [stdout]    | |                            ^ cannot use the `?` operator in a function that returns `()`
[INFO] [stdout] ...  |
[INFO] [stdout] 16 | | hidelimiter(&mut stream);
[INFO] [stdout] 17 | | } _doctest_main_src_lib_rs_143_0() }
[INFO] [stdout]    | |_- this function should return `Result` or `Option` to accept `?`
[INFO] [stdout]    |
[INFO] [stdout]    = help: the trait `FromResidual<_>` is not implemented for `()`
[INFO] [stdout]    = note: required by `from_residual`
[INFO] [stdout] 
[INFO] [stdout] error[E0277]: the `?` operator can only be used in a function that returns `Result` or `Option` (or another type that implements `FromResidual`)
[INFO] [stdout]   --> src/lib.rs:155:39
[INFO] [stdout]    |
[INFO] [stdout] 2  |   fn main() { #[allow(non_snake_case)] fn _doctest_main_src_lib_rs_143_0() {
[INFO] [stdout]    |  ______________________________________-
[INFO] [stdout] 3  | | use std::net::TcpStream;
[INFO] [stdout] 4  | | let stream = TcpStream::connect("127.0.0.1:34567")
[INFO] [stdout] 5  | |
[INFO] [stdout] ...  |
[INFO] [stdout] 14 | | hiwrite(&mut stream, &data[..500_000])?;
[INFO] [stdout]    | |                                       ^ cannot use the `?` operator in a function that returns `()`
[INFO] [stdout] 15 | | hiwrite(&mut stream, &data[500_000..])?;
[INFO] [stdout] 16 | | hidelimiter(&mut stream);
[INFO] [stdout] 17 | | } _doctest_main_src_lib_rs_143_0() }
[INFO] [stdout]    | |_- this function should return `Result` or `Option` to accept `?`
[INFO] [stdout]    |
[INFO] [stdout]    = help: the trait `FromResidual<_>` is not implemented for `()`
[INFO] [stdout]    = note: required by `from_residual`
[INFO] [stdout] 
[INFO] [stdout] error[E0277]: the `?` operator can only be used in a function that returns `Result` or `Option` (or another type that implements `FromResidual`)
[INFO] [stdout]   --> src/lib.rs:156:39
[INFO] [stdout]    |
[INFO] [stdout] 2  |   fn main() { #[allow(non_snake_case)] fn _doctest_main_src_lib_rs_143_0() {
[INFO] [stdout]    |  ______________________________________-
[INFO] [stdout] 3  | | use std::net::TcpStream;
[INFO] [stdout] 4  | | let stream = TcpStream::connect("127.0.0.1:34567")
[INFO] [stdout] 5  | |
[INFO] [stdout] ...  |
[INFO] [stdout] 15 | | hiwrite(&mut stream, &data[500_000..])?;
[INFO] [stdout]    | |                                       ^ cannot use the `?` operator in a function that returns `()`
[INFO] [stdout] 16 | | hidelimiter(&mut stream);
[INFO] [stdout] 17 | | } _doctest_main_src_lib_rs_143_0() }
[INFO] [stdout]    | |_- this function should return `Result` or `Option` to accept `?`
[INFO] [stdout]    |
[INFO] [stdout]    = help: the trait `FromResidual<_>` is not implemented for `()`
[INFO] [stdout]    = note: required by `from_residual`
[INFO] [stdout] 
[INFO] [stdout] error: aborting due to 9 previous errors
[INFO] [stdout] 
[INFO] [stdout] Some errors have detailed explanations: E0277, E0425.
[INFO] [stdout] For more information about an error, try `rustc --explain E0277`.
[INFO] [stdout] Couldn't compile the test.
[INFO] [stdout] 
[INFO] [stdout] failures:
[INFO] [stdout]     src/lib.rs - (line 8)
[INFO] [stdout]     src/lib.rs - hidelimiter (line 186)
[INFO] [stdout]     src/lib.rs - hiread (line 97)
[INFO] [stdout]     src/lib.rs - hiwrite (line 143)
[INFO] [stdout] 
[INFO] [stdout] test result: FAILED. 0 passed; 4 failed; 0 ignored; 0 measured; 0 filtered out; finished in 0.23s
[INFO] [stdout] 
[INFO] [stderr] error: test failed, to rerun pass '--doc'
[INFO] running `Command { std: "docker" "inspect" "666d5ebe14b8518e738cb502aeddeb64274d7c51f2414486889dd926c90ca402", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "666d5ebe14b8518e738cb502aeddeb64274d7c51f2414486889dd926c90ca402", kill_on_drop: false }`
[INFO] [stdout] 666d5ebe14b8518e738cb502aeddeb64274d7c51f2414486889dd926c90ca402
