[INFO] fetching crate hi-tension 0.1.0...
[INFO] testing hi-tension-0.1.0 against beta-2025-09-21 for beta-1.91-3
[INFO] extracting crate hi-tension 0.1.0 into /workspace/builds/worker-5-tc2/source
[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-5-tc2/source/Cargo.toml
[INFO] validating manifest of crates.io crate hi-tension 0.1.0 on toolchain beta-2025-09-21
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+beta-2025-09-21" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+beta-2025-09-21" "generate-lockfile" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+beta-2025-09-21" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-5-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-5-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:e90291280db7d1fac5b66fc6dad9f9662629e7365a55743daf9bdf73ebc4ea79" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2025-09-21" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 5c7cfb630ecd9b20339c5ffde9dd21f48ce612f11ba33c6ee32e1d3ab05973bc
[INFO] running `Command { std: "docker" "start" "-a" "5c7cfb630ecd9b20339c5ffde9dd21f48ce612f11ba33c6ee32e1d3ab05973bc", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "5c7cfb630ecd9b20339c5ffde9dd21f48ce612f11ba33c6ee32e1d3ab05973bc", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "5c7cfb630ecd9b20339c5ffde9dd21f48ce612f11ba33c6ee32e1d3ab05973bc", kill_on_drop: false }`
[INFO] [stdout] 5c7cfb630ecd9b20339c5ffde9dd21f48ce612f11ba33c6ee32e1d3ab05973bc
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-5-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-5-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=warn" "-e" "RUSTDOCFLAGS=--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:e90291280db7d1fac5b66fc6dad9f9662629e7365a55743daf9bdf73ebc4ea79" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2025-09-21" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] b5a421b860482b6d2bf5766226a95784e56c461ed39b99de0aa7fa9215dae3ec
[INFO] running `Command { std: "docker" "start" "-a" "b5a421b860482b6d2bf5766226a95784e56c461ed39b99de0aa7fa9215dae3ec", kill_on_drop: false }`
[INFO] [stderr]    Compiling hi-tension v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: calls to `std::mem::drop` with a reference instead of an owned value does nothing
[INFO] [stdout]    --> src/lib.rs:110:13
[INFO] [stdout]     |
[INFO] [stdout] 110 |             drop(buf_view);
[INFO] [stdout]     |             ^^^^^--------^
[INFO] [stdout]     |                  |
[INFO] [stdout]     |                  argument has type `&mut [u8]`
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(dropping_references)]` on by default
[INFO] [stdout] help: use `let _ = ...` to ignore the expression or result
[INFO] [stdout]     |
[INFO] [stdout] 110 -             drop(buf_view);
[INFO] [stdout] 110 +             let _ = buf_view;
[INFO] [stdout]     |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished `dev` profile [unoptimized + debuginfo] target(s) in 0.21s
[INFO] running `Command { std: "docker" "inspect" "b5a421b860482b6d2bf5766226a95784e56c461ed39b99de0aa7fa9215dae3ec", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "b5a421b860482b6d2bf5766226a95784e56c461ed39b99de0aa7fa9215dae3ec", kill_on_drop: false }`
[INFO] [stdout] b5a421b860482b6d2bf5766226a95784e56c461ed39b99de0aa7fa9215dae3ec
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-5-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-5-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=warn" "-e" "RUSTDOCFLAGS=--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:e90291280db7d1fac5b66fc6dad9f9662629e7365a55743daf9bdf73ebc4ea79" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2025-09-21" "test" "--frozen" "--no-run" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] e64f1010cdb79cb3c47803eae10779cccb0765580953f939e43c0b553954549a
[INFO] running `Command { std: "docker" "start" "-a" "e64f1010cdb79cb3c47803eae10779cccb0765580953f939e43c0b553954549a", kill_on_drop: false }`
[INFO] [stdout] warning: calls to `std::mem::drop` with a reference instead of an owned value does nothing
[INFO] [stdout]    --> src/lib.rs:110:13
[INFO] [stdout]     |
[INFO] [stdout] 110 |             drop(buf_view);
[INFO] [stdout]     |             ^^^^^--------^
[INFO] [stdout]     |                  |
[INFO] [stdout]     |                  argument has type `&mut [u8]`
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(dropping_references)]` on by default
[INFO] [stdout] help: use `let _ = ...` to ignore the expression or result
[INFO] [stdout]     |
[INFO] [stdout] 110 -             drop(buf_view);
[INFO] [stdout] 110 +             let _ = buf_view;
[INFO] [stdout]     |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]    Compiling hi-tension v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: calls to `std::mem::drop` with a reference instead of an owned value does nothing
[INFO] [stdout]    --> src/lib.rs:110:13
[INFO] [stdout]     |
[INFO] [stdout] 110 |             drop(buf_view);
[INFO] [stdout]     |             ^^^^^--------^
[INFO] [stdout]     |                  |
[INFO] [stdout]     |                  argument has type `&mut [u8]`
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(dropping_references)]` on by default
[INFO] [stdout] help: use `let _ = ...` to ignore the expression or result
[INFO] [stdout]     |
[INFO] [stdout] 110 -             drop(buf_view);
[INFO] [stdout] 110 +             let _ = buf_view;
[INFO] [stdout]     |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished `test` profile [unoptimized + debuginfo] target(s) in 0.31s
[INFO] running `Command { std: "docker" "inspect" "e64f1010cdb79cb3c47803eae10779cccb0765580953f939e43c0b553954549a", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "e64f1010cdb79cb3c47803eae10779cccb0765580953f939e43c0b553954549a", kill_on_drop: false }`
[INFO] [stdout] e64f1010cdb79cb3c47803eae10779cccb0765580953f939e43c0b553954549a
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-5-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-5-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=warn" "-e" "RUSTDOCFLAGS=--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:e90291280db7d1fac5b66fc6dad9f9662629e7365a55743daf9bdf73ebc4ea79" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2025-09-21" "test" "--frozen", kill_on_drop: false }`
[INFO] [stdout] 2b54604a169d2f0b9c6b913ad8d64de5445b4f4f247876b442c7ee8a46b24a54
[INFO] running `Command { std: "docker" "start" "-a" "2b54604a169d2f0b9c6b913ad8d64de5445b4f4f247876b442c7ee8a46b24a54", kill_on_drop: false }`
[INFO] [stderr] warning: calls to `std::mem::drop` with a reference instead of an owned value does nothing
[INFO] [stderr]    --> src/lib.rs:110:13
[INFO] [stderr]     |
[INFO] [stderr] 110 |             drop(buf_view);
[INFO] [stderr]     |             ^^^^^--------^
[INFO] [stderr]     |                  |
[INFO] [stderr]     |                  argument has type `&mut [u8]`
[INFO] [stderr]     |
[INFO] [stderr]     = note: `#[warn(dropping_references)]` on by default
[INFO] [stderr] help: use `let _ = ...` to ignore the expression or result
[INFO] [stderr]     |
[INFO] [stderr] 110 -             drop(buf_view);
[INFO] [stderr] 110 +             let _ = buf_view;
[INFO] [stderr]     |
[INFO] [stderr] 
[INFO] [stderr] warning: `hi-tension` (lib) generated 1 warning
[INFO] [stderr] warning: `hi-tension` (lib test) generated 1 warning (1 duplicate)
[INFO] [stderr]     Finished `test` profile [unoptimized + debuginfo] target(s) in 0.04s
[INFO] [stderr]      Running unittests src/lib.rs (/opt/rustwide/target/debug/deps/hi_tension-468deb42b638d0a6)
[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 - hidelimiter (line 186) - compile ... FAILED
[INFO] [stdout] test src/lib.rs - (line 8) ... FAILED
[INFO] [stdout] test src/lib.rs - hiread (line 97) - compile ... FAILED
[INFO] [stdout] test src/lib.rs - hiwrite (line 143) - compile ... FAILED
[INFO] [stdout] 
[INFO] [stdout] failures:
[INFO] [stdout] 
[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: aborting due to 3 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 - (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:26:9
[INFO] [stdout]     |
[INFO] [stdout]  21 | hiwrite(&mut stream, &data)?;
[INFO] [stdout]     | ------- ^^^^^^^^^^^ the trait `std::io::Write` is not implemented for `Result<TcpStream, std::io::Error>`
[INFO] [stdout]     | |
[INFO] [stdout]     | required by a bound introduced by this call
[INFO] [stdout]     |
[INFO] [stdout] note: required by a bound in `hiwrite`
[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:26:28
[INFO] [stdout]    |
[INFO] [stdout]  4 | fn main() { #[allow(non_snake_case)] fn _doctest_main_src_lib_rs_8_0() {
[INFO] [stdout]    |                                      --------------------------------- this function should return `Result` or `Option` to accept `?`
[INFO] [stdout] ...
[INFO] [stdout] 21 | hiwrite(&mut stream, &data)?;
[INFO] [stdout]    |                            ^ cannot use the `?` operator in a function that returns `()`
[INFO] [stdout]    |
[INFO] [stdout] help: consider adding return type
[INFO] [stdout]    |
[INFO] [stdout]  4 ~ fn main() { #[allow(non_snake_case)] fn _doctest_main_src_lib_rs_8_0() -> Result<(), Box<dyn std::error::Error>> {
[INFO] [stdout]  5 | use hi_tension::{hiread, hiwrite, hidelimiter};
[INFO] [stdout] ...
[INFO] [stdout] 32 | let vec = hiread(&mut stream)?;
[INFO] [stdout] 33 +     Ok(())
[INFO] [stdout]    |
[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:27:13
[INFO] [stdout]     |
[INFO] [stdout]  22 | hidelimiter(&mut stream);
[INFO] [stdout]     | ----------- ^^^^^^^^^^^ the trait `std::io::Read` is not implemented for `Result<TcpStream, std::io::Error>`
[INFO] [stdout]     | |
[INFO] [stdout]     | required by a bound introduced by this call
[INFO] [stdout]     |
[INFO] [stdout] note: required by a bound in `hidelimiter`
[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:27:13
[INFO] [stdout]     |
[INFO] [stdout]  22 | hidelimiter(&mut stream);
[INFO] [stdout]     | ----------- ^^^^^^^^^^^ the trait `std::io::Write` is not implemented for `Result<TcpStream, std::io::Error>`
[INFO] [stdout]     | |
[INFO] [stdout]     | required by a bound introduced by this call
[INFO] [stdout]     |
[INFO] [stdout] note: required by a bound in `hidelimiter`
[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:30:9
[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]     | required by a bound introduced by this call
[INFO] [stdout]     |
[INFO] [stdout] note: required by a bound in `hiwrite`
[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]  4 | fn main() { #[allow(non_snake_case)] fn _doctest_main_src_lib_rs_8_0() {
[INFO] [stdout]    |                                      --------------------------------- this function should return `Result` or `Option` to accept `?`
[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] help: consider adding return type
[INFO] [stdout]    |
[INFO] [stdout]  4 ~ fn main() { #[allow(non_snake_case)] fn _doctest_main_src_lib_rs_8_0() -> Result<(), Box<dyn std::error::Error>> {
[INFO] [stdout]  5 | use hi_tension::{hiread, hiwrite, hidelimiter};
[INFO] [stdout] ...
[INFO] [stdout] 32 | let vec = hiread(&mut stream)?;
[INFO] [stdout] 33 +     Ok(())
[INFO] [stdout]    |
[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:31:9
[INFO] [stdout]     |
[INFO] [stdout]  26 | 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]     | required by a bound introduced by this call
[INFO] [stdout]     |
[INFO] [stdout] note: required by a bound in `hiwrite`
[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:31:39
[INFO] [stdout]    |
[INFO] [stdout]  4 | fn main() { #[allow(non_snake_case)] fn _doctest_main_src_lib_rs_8_0() {
[INFO] [stdout]    |                                      --------------------------------- this function should return `Result` or `Option` to accept `?`
[INFO] [stdout] ...
[INFO] [stdout] 26 | hiwrite(&mut stream, &data[500_000..])?;
[INFO] [stdout]    |                                       ^ cannot use the `?` operator in a function that returns `()`
[INFO] [stdout]    |
[INFO] [stdout] help: consider adding return type
[INFO] [stdout]    |
[INFO] [stdout]  4 ~ fn main() { #[allow(non_snake_case)] fn _doctest_main_src_lib_rs_8_0() -> Result<(), Box<dyn std::error::Error>> {
[INFO] [stdout]  5 | use hi_tension::{hiread, hiwrite, hidelimiter};
[INFO] [stdout] ...
[INFO] [stdout] 32 | let vec = hiread(&mut stream)?;
[INFO] [stdout] 33 +     Ok(())
[INFO] [stdout]    |
[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:32:13
[INFO] [stdout]     |
[INFO] [stdout]  27 | hidelimiter(&mut stream);
[INFO] [stdout]     | ----------- ^^^^^^^^^^^ the trait `std::io::Read` is not implemented for `Result<TcpStream, std::io::Error>`
[INFO] [stdout]     | |
[INFO] [stdout]     | required by a bound introduced by this call
[INFO] [stdout]     |
[INFO] [stdout] note: required by a bound in `hidelimiter`
[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:32:13
[INFO] [stdout]     |
[INFO] [stdout]  27 | hidelimiter(&mut stream);
[INFO] [stdout]     | ----------- ^^^^^^^^^^^ the trait `std::io::Write` is not implemented for `Result<TcpStream, std::io::Error>`
[INFO] [stdout]     | |
[INFO] [stdout]     | required by a bound introduced by this call
[INFO] [stdout]     |
[INFO] [stdout] note: required by a bound in `hidelimiter`
[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:37:18
[INFO] [stdout]     |
[INFO] [stdout]  32 | 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]     |           required by a bound introduced by this call
[INFO] [stdout]     |
[INFO] [stdout] note: required by a bound in `hiread`
[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:37:18
[INFO] [stdout]     |
[INFO] [stdout]  32 | 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]     |           required by a bound introduced by this call
[INFO] [stdout]     |
[INFO] [stdout] note: required by a bound in `hiread`
[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:37:30
[INFO] [stdout]    |
[INFO] [stdout]  4 | fn main() { #[allow(non_snake_case)] fn _doctest_main_src_lib_rs_8_0() {
[INFO] [stdout]    |                                      --------------------------------- this function should return `Result` or `Option` to accept `?`
[INFO] [stdout] ...
[INFO] [stdout] 32 | let vec = hiread(&mut stream)?;
[INFO] [stdout]    |                              ^ cannot use the `?` operator in a function that returns `()`
[INFO] [stdout]    |
[INFO] [stdout] help: consider adding return type
[INFO] [stdout]    |
[INFO] [stdout]  4 ~ fn main() { #[allow(non_snake_case)] fn _doctest_main_src_lib_rs_8_0() -> Result<(), Box<dyn std::error::Error>> {
[INFO] [stdout]  5 | use hi_tension::{hiread, hiwrite, hidelimiter};
[INFO] [stdout] ...
[INFO] [stdout] 32 | let vec = hiread(&mut stream)?;
[INFO] [stdout] 33 +     Ok(())
[INFO] [stdout]    |
[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 - 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 - 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: aborting due to 6 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] 
[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 0.21s
[INFO] [stdout] 
[INFO] [stderr] error: doctest failed, to rerun pass `--doc`
[INFO] running `Command { std: "docker" "inspect" "2b54604a169d2f0b9c6b913ad8d64de5445b4f4f247876b442c7ee8a46b24a54", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "2b54604a169d2f0b9c6b913ad8d64de5445b4f4f247876b442c7ee8a46b24a54", kill_on_drop: false }`
[INFO] [stdout] 2b54604a169d2f0b9c6b913ad8d64de5445b4f4f247876b442c7ee8a46b24a54
