[INFO] cloning repository https://github.com/sevenshi/async_examples
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/sevenshi/async_examples" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fsevenshi%2Fasync_examples", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fsevenshi%2Fasync_examples'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 99c0f864073b318d50378b943551d6982d628043
[INFO] checking sevenshi/async_examples against master#cf79d034aa3d8f396d407aafce6f1ccd818e710e for pr-155657-1
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fsevenshi%2Fasync_examples" "/workspace/builds/worker-5-tc1/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-5-tc1/source'...
[INFO] [stderr] done.
[INFO] started tweaking git repo https://github.com/sevenshi/async_examples
[INFO] finished tweaking git repo https://github.com/sevenshi/async_examples
[INFO] tweaked toml for git repo https://github.com/sevenshi/async_examples written to /workspace/builds/worker-5-tc1/source/Cargo.toml
[INFO] validating manifest of git repo https://github.com/sevenshi/async_examples on toolchain cf79d034aa3d8f396d407aafce6f1ccd818e710e
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+cf79d034aa3d8f396d407aafce6f1ccd818e710e" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] crate git repo https://github.com/sevenshi/async_examples 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" "+cf79d034aa3d8f396d407aafce6f1ccd818e710e" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr] warning: virtual workspace defaulting to `resolver = "1"` despite one or more workspace members being on edition 2021 which implies `resolver = "2"`
[INFO] [stderr]   |
[INFO] [stderr]   = note: to keep the current resolver, specify `workspace.resolver = "1"` in the workspace root's manifest
[INFO] [stderr]   = note: to use the edition 2021 resolver, specify `workspace.resolver = "2"` in the workspace root's manifest
[INFO] [stderr]   = note: for more details see https://doc.rust-lang.org/cargo/reference/resolver.html#resolver-versions
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]     Updating crates.io index
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]  Downloading crates ...
[INFO] [stderr]   Downloaded slab v0.4.7
[INFO] [stderr]   Downloaded autocfg v1.1.0
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[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-5-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-5-tc1/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:d429b63d4308055ea97f60fb1d3dfca48854a00942f1bd2ad806beaf015945ec" "/opt/rustwide/cargo-home/bin/cargo" "+cf79d034aa3d8f396d407aafce6f1ccd818e710e" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] a9004ac03a49b289f602b55fb58666a8b9beb72c7c02ea9b2f919783958de111
[INFO] running `Command { std: "docker" "start" "-a" "a9004ac03a49b289f602b55fb58666a8b9beb72c7c02ea9b2f919783958de111", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "a9004ac03a49b289f602b55fb58666a8b9beb72c7c02ea9b2f919783958de111", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "a9004ac03a49b289f602b55fb58666a8b9beb72c7c02ea9b2f919783958de111", kill_on_drop: false }`
[INFO] [stdout] a9004ac03a49b289f602b55fb58666a8b9beb72c7c02ea9b2f919783958de111
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-5-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-5-tc1/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:d429b63d4308055ea97f60fb1d3dfca48854a00942f1bd2ad806beaf015945ec" "/opt/rustwide/cargo-home/bin/cargo" "+cf79d034aa3d8f396d407aafce6f1ccd818e710e" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 715aecd853d462afd747854f4694c602bcd9a77ab938c4455ea4dd451f4c681a
[INFO] running `Command { std: "docker" "start" "-a" "715aecd853d462afd747854f4694c602bcd9a77ab938c4455ea4dd451f4c681a", kill_on_drop: false }`
[INFO] [stderr] warning: virtual workspace defaulting to `resolver = "1"` despite one or more workspace members being on edition 2021 which implies `resolver = "2"`
[INFO] [stderr]   |
[INFO] [stderr]   = note: to keep the current resolver, specify `workspace.resolver = "1"` in the workspace root's manifest
[INFO] [stderr]   = note: to use the edition 2021 resolver, specify `workspace.resolver = "2"` in the workspace root's manifest
[INFO] [stderr]   = note: for more details see https://doc.rust-lang.org/cargo/reference/resolver.html#resolver-versions
[INFO] [stderr]    Compiling proc-macro2 v1.0.40
[INFO] [stderr]    Compiling unicode-ident v1.0.2
[INFO] [stderr]    Compiling quote v1.0.20
[INFO] [stderr]    Compiling syn v1.0.98
[INFO] [stderr]    Compiling futures-core v0.3.21
[INFO] [stderr]    Compiling autocfg v1.1.0
[INFO] [stderr]    Compiling futures-channel v0.3.21
[INFO] [stderr]    Compiling futures-task v0.3.21
[INFO] [stderr]    Compiling memchr v2.5.0
[INFO] [stderr]     Checking futures-sink v0.3.21
[INFO] [stderr]    Compiling futures-util v0.3.21
[INFO] [stderr]     Checking pin-utils v0.1.0
[INFO] [stderr]     Checking pin-project-lite v0.2.9
[INFO] [stderr]     Checking futures-io v0.3.21
[INFO] [stderr]     Checking _01_02_why_async v0.1.0 (/opt/rustwide/workdir/_01_02_why_async)
[INFO] [stderr]     Checking _02_02_future_trait v0.1.0 (/opt/rustwide/workdir/_02_02_future_trait)
[INFO] [stdout] error: associated type in `impl` without body
[INFO] [stdout]   --> _02_02_future_trait/src/lib.rs:35:5
[INFO] [stdout]    |
[INFO] [stdout] 35 |     type Vec<u8>;
[INFO] [stdout]    |     ^^^^^^^^^^^^-
[INFO] [stdout]    |                 |
[INFO] [stdout]    |                 help: provide a definition for the type: `= <type>;`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0261]: use of undeclared lifetime name `'a`
[INFO] [stdout]   --> _02_02_future_trait/src/lib.rs:34:34
[INFO] [stdout]    |
[INFO] [stdout] 34 | impl SimpleFuture for SocketRead<'a> {
[INFO] [stdout]    |                                  ^^ undeclared lifetime
[INFO] [stdout]    |
[INFO] [stdout] help: consider introducing lifetime `'a` here
[INFO] [stdout]    |
[INFO] [stdout] 34 | impl<'a> SimpleFuture for SocketRead<'a> {
[INFO] [stdout]    |     ++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0437]: type `Vec` is not a member of trait `SimpleFuture`
[INFO] [stdout]   --> _02_02_future_trait/src/lib.rs:35:5
[INFO] [stdout]    |
[INFO] [stdout] 35 |     type Vec<u8>;
[INFO] [stdout]    |     ^^^^^^^^^^^^^ not a member of trait `SimpleFuture`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `std::sync::PoisonError`
[INFO] [stdout]  --> _02_02_future_trait/src/lib.rs:1:5
[INFO] [stdout]   |
[INFO] [stdout] 1 | use std::sync::PoisonError;
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: type parameter `u8` should have an upper camel case name
[INFO] [stdout]   --> _02_02_future_trait/src/lib.rs:35:14
[INFO] [stdout]    |
[INFO] [stdout] 35 |     type Vec<u8>;
[INFO] [stdout]    |              ^^ help: convert the identifier to upper camel case (notice the capitalization): `U8`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(non_camel_case_types)]` (part of `#[warn(nonstandard_style)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0782]: expected a type, found a trait
[INFO] [stdout]    --> _02_02_future_trait/src/lib.rs:128:24
[INFO] [stdout]     |
[INFO] [stdout] 128 |     impl<O> Future for RealFuture<O>  {
[INFO] [stdout]     |                        ^^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout] help: you can add the `dyn` keyword if you want a trait object
[INFO] [stdout]     |
[INFO] [stdout] 128 |     impl<O> Future for dyn RealFuture<O>  {
[INFO] [stdout]     |                        +++
[INFO] [stdout] help: alternatively use a blanket implementation to implement `Future` for all types that also implement `RealFuture<O>`
[INFO] [stdout]     |
[INFO] [stdout] 128 -     impl<O> Future for RealFuture<O>  {
[INFO] [stdout] 128 +     impl<O, T: RealFuture<O>> Future for T  {
[INFO] [stdout]     |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0308]: mismatched types
[INFO] [stdout]    --> _02_02_future_trait/src/lib.rs:99:36
[INFO] [stdout]     |
[INFO] [stdout]  95 | /         if let Some(first) = &mut self.first {
[INFO] [stdout]  96 | |             match first.poll(wake){
[INFO] [stdout] ...   |
[INFO] [stdout]  99 | |                 Poll::Ready(()) => self.first.take(),
[INFO] [stdout]     | |                                    ^^^^^^^^^^^^^^^^^ expected `()`, found `Option<FutureA>`
[INFO] [stdout] ...   |
[INFO] [stdout] 103 | |         }
[INFO] [stdout]     | |_________- `if` expressions without `else` arms expect their inner expression to be `()`
[INFO] [stdout]     |
[INFO] [stdout]     = note: expected unit type `()`
[INFO] [stdout]                     found enum `Option<FutureA>`
[INFO] [stdout] help: consider using a semicolon here
[INFO] [stdout]     |
[INFO] [stdout] 102 |             };
[INFO] [stdout]     |              +
[INFO] [stdout] help: consider using a semicolon here
[INFO] [stdout]     |
[INFO] [stdout] 103 |         };
[INFO] [stdout]     |          +
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] Some errors have detailed explanations: E0261, E0308, E0437, E0782.
[INFO] [stdout] 
[INFO] [stdout] For more information about an error, try `rustc --explain E0261`.
[INFO] [stdout] 
[INFO] [stdout] error: associated type in `impl` without body
[INFO] [stdout]   --> _02_02_future_trait/src/lib.rs:35:5
[INFO] [stdout]    |
[INFO] [stdout] 35 |     type Vec<u8>;
[INFO] [stdout]    |     ^^^^^^^^^^^^-
[INFO] [stdout]    |                 |
[INFO] [stdout]    |                 help: provide a definition for the type: `= <type>;`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0261]: use of undeclared lifetime name `'a`
[INFO] [stdout]   --> _02_02_future_trait/src/lib.rs:34:34
[INFO] [stdout]    |
[INFO] [stdout] 34 | impl SimpleFuture for SocketRead<'a> {
[INFO] [stdout]    |                                  ^^ undeclared lifetime
[INFO] [stdout]    |
[INFO] [stdout] help: consider introducing lifetime `'a` here
[INFO] [stdout]    |
[INFO] [stdout] 34 | impl<'a> SimpleFuture for SocketRead<'a> {
[INFO] [stdout]    |     ++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0437]: type `Vec` is not a member of trait `SimpleFuture`
[INFO] [stdout]   --> _02_02_future_trait/src/lib.rs:35:5
[INFO] [stdout]    |
[INFO] [stdout] 35 |     type Vec<u8>;
[INFO] [stdout]    |     ^^^^^^^^^^^^^ not a member of trait `SimpleFuture`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `std::sync::PoisonError`
[INFO] [stdout]  --> _02_02_future_trait/src/lib.rs:1:5
[INFO] [stdout]   |
[INFO] [stdout] 1 | use std::sync::PoisonError;
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: type parameter `u8` should have an upper camel case name
[INFO] [stdout]   --> _02_02_future_trait/src/lib.rs:35:14
[INFO] [stdout]    |
[INFO] [stdout] 35 |     type Vec<u8>;
[INFO] [stdout]    |              ^^ help: convert the identifier to upper camel case (notice the capitalization): `U8`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(non_camel_case_types)]` (part of `#[warn(nonstandard_style)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0782]: expected a type, found a trait
[INFO] [stdout]    --> _02_02_future_trait/src/lib.rs:128:24
[INFO] [stdout]     |
[INFO] [stdout] 128 |     impl<O> Future for RealFuture<O>  {
[INFO] [stdout]     |                        ^^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout] help: you can add the `dyn` keyword if you want a trait object
[INFO] [stdout]     |
[INFO] [stdout] 128 |     impl<O> Future for dyn RealFuture<O>  {
[INFO] [stdout]     |                        +++
[INFO] [stdout] help: alternatively use a blanket implementation to implement `Future` for all types that also implement `RealFuture<O>`
[INFO] [stdout]     |
[INFO] [stdout] 128 -     impl<O> Future for RealFuture<O>  {
[INFO] [stdout] 128 +     impl<O, T: RealFuture<O>> Future for T  {
[INFO] [stdout]     |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `_02_02_future_trait` (lib test) due to 5 previous errors; 2 warnings emitted
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[INFO] [stdout] error[E0308]: mismatched types
[INFO] [stdout]    --> _02_02_future_trait/src/lib.rs:99:36
[INFO] [stdout]     |
[INFO] [stdout]  95 | /         if let Some(first) = &mut self.first {
[INFO] [stdout]  96 | |             match first.poll(wake){
[INFO] [stdout] ...   |
[INFO] [stdout]  99 | |                 Poll::Ready(()) => self.first.take(),
[INFO] [stdout]     | |                                    ^^^^^^^^^^^^^^^^^ expected `()`, found `Option<FutureA>`
[INFO] [stdout] ...   |
[INFO] [stdout] 103 | |         }
[INFO] [stdout]     | |_________- `if` expressions without `else` arms expect their inner expression to be `()`
[INFO] [stdout]     |
[INFO] [stdout]     = note: expected unit type `()`
[INFO] [stdout]                     found enum `Option<FutureA>`
[INFO] [stdout] help: consider using a semicolon here
[INFO] [stdout]     |
[INFO] [stdout] 102 |             };
[INFO] [stdout]     |              +
[INFO] [stdout] help: consider using a semicolon here
[INFO] [stdout]     |
[INFO] [stdout] 103 |         };
[INFO] [stdout]     |          +
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] Some errors have detailed explanations: E0261, E0308, E0437, E0782.
[INFO] [stdout] 
[INFO] [stdout] For more information about an error, try `rustc --explain E0261`.
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `_02_02_future_trait` (lib) due to 5 previous errors; 2 warnings emitted
[INFO] running `Command { std: "docker" "inspect" "715aecd853d462afd747854f4694c602bcd9a77ab938c4455ea4dd451f4c681a", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "715aecd853d462afd747854f4694c602bcd9a77ab938c4455ea4dd451f4c681a", kill_on_drop: false }`
[INFO] [stdout] 715aecd853d462afd747854f4694c602bcd9a77ab938c4455ea4dd451f4c681a
