[INFO] fetching crate stream_multiplexer 0.16.1...
[INFO] testing stream_multiplexer-0.16.1 against 1.90.0 for beta-1.91-3
[INFO] extracting crate stream_multiplexer 0.16.1 into /workspace/builds/worker-4-tc1/source
[INFO] started tweaking crates.io crate stream_multiplexer 0.16.1
[INFO] finished tweaking crates.io crate stream_multiplexer 0.16.1
[INFO] tweaked toml for crates.io crate stream_multiplexer 0.16.1 written to /workspace/builds/worker-4-tc1/source/Cargo.toml
[INFO] validating manifest of crates.io crate stream_multiplexer 0.16.1 on toolchain 1.90.0
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+1.90.0" "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" "+1.90.0" "generate-lockfile" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Updating crates.io index
[INFO] [stderr]      Locking 75 packages to latest compatible versions
[INFO] [stderr]       Adding alto_logger v0.3.7 (available: v0.4.0)
[INFO] [stderr]       Adding async-channel v1.9.0 (available: v2.5.0)
[INFO] [stderr]       Adding async-io v0.1.11 (available: v2.6.0)
[INFO] [stderr]       Adding dashmap v4.0.2 (available: v6.1.0)
[INFO] [stderr]       Adding parking_lot v0.11.2 (available: v0.12.4)
[INFO] [stderr]       Adding pin-project-lite v0.1.12 (available: v0.2.16)
[INFO] [stderr]       Adding sharded-slab v0.0.9 (available: v0.1.7)
[INFO] [stderr]       Adding smol v0.3.3 (available: v2.0.2)
[INFO] [stderr]       Adding thiserror v1.0.69 (available: v2.0.17)
[INFO] [stderr]       Adding tokio-util v0.3.1 (available: v0.7.16)
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+1.90.0" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]  Downloading crates ...
[INFO] [stderr]   Downloaded wepoll-sys-stjepang v1.0.8
[INFO] [stderr]   Downloaded polling v0.1.9
[INFO] [stderr]   Downloaded easy-parallel v3.3.1
[INFO] [stderr]   Downloaded vec-arena v0.5.2
[INFO] [stderr]   Downloaded smol v0.3.3
[INFO] [stderr]   Downloaded alto_logger v0.3.7
[INFO] [stderr]   Downloaded sharded-slab v0.0.9
[INFO] [stderr]   Downloaded async-task v3.0.0
[INFO] [stderr]   Downloaded multitask v0.2.0
[INFO] [stderr]   Downloaded parking v1.0.6
[INFO] [stderr]   Downloaded async-executor v0.1.2
[INFO] [stderr]   Downloaded async-io v0.1.11
[INFO] [stderr]   Downloaded futures-lite v0.1.11
[INFO] [stderr]   Downloaded async-mutex v1.4.1
[INFO] [stderr]   Downloaded blocking v0.5.2
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-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:e90291280db7d1fac5b66fc6dad9f9662629e7365a55743daf9bdf73ebc4ea79" "/opt/rustwide/cargo-home/bin/cargo" "+1.90.0" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] d12e239a23232ce4e080b25939b03dc7cbc2e1db10f51838b46f9ccd4c413ae7
[INFO] running `Command { std: "docker" "start" "-a" "d12e239a23232ce4e080b25939b03dc7cbc2e1db10f51838b46f9ccd4c413ae7", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "d12e239a23232ce4e080b25939b03dc7cbc2e1db10f51838b46f9ccd4c413ae7", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "d12e239a23232ce4e080b25939b03dc7cbc2e1db10f51838b46f9ccd4c413ae7", kill_on_drop: false }`
[INFO] [stdout] d12e239a23232ce4e080b25939b03dc7cbc2e1db10f51838b46f9ccd4c413ae7
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-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=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" "+1.90.0" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 6339f2864fcd8ef644714d1bc4ecb664315d3646609687f9cd7f164165977749
[INFO] running `Command { std: "docker" "start" "-a" "6339f2864fcd8ef644714d1bc4ecb664315d3646609687f9cd7f164165977749", kill_on_drop: false }`
[INFO] [stderr]    Compiling crossbeam-utils v0.8.21
[INFO] [stderr]    Compiling instant v0.1.13
[INFO] [stderr]    Compiling async-mutex v1.4.1
[INFO] [stderr]    Compiling sharded-slab v0.0.9
[INFO] [stderr]    Compiling thiserror-impl v1.0.69
[INFO] [stderr]    Compiling dashmap v4.0.2
[INFO] [stderr]    Compiling futures-util v0.3.31
[INFO] [stderr]    Compiling parking_lot_core v0.8.6
[INFO] [stderr]    Compiling parking_lot v0.11.2
[INFO] [stderr]    Compiling concurrent-queue v2.5.0
[INFO] [stderr]    Compiling async-channel v1.9.0
[INFO] [stderr]    Compiling thiserror v1.0.69
[INFO] [stderr]    Compiling stream_multiplexer v0.16.1 (/opt/rustwide/workdir)
[INFO] [stdout] error[E0502]: cannot borrow `*self` as mutable because it is also borrowed as immutable
[INFO] [stdout]    --> src/lib.rs:355:33
[INFO] [stdout]     |
[INFO] [stdout] 341 |         match self.channels.get(&channel_id) {
[INFO] [stdout]     |               ------------------------------
[INFO] [stdout]     |               |
[INFO] [stdout]     |               immutable borrow occurs here
[INFO] [stdout]     |               a temporary with access to the immutable borrow is created here ...
[INFO] [stdout] ...
[INFO] [stdout] 355 |                                 self.process_add_channel(add_res)?;
[INFO] [stdout]     |                                 ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ mutable borrow occurs here
[INFO] [stdout] ...
[INFO] [stdout] 363 |     }
[INFO] [stdout]     |     - ... and the immutable borrow might be used here, when that temporary is dropped and runs the destructor for type `Option<dashmap::mapref::one::Ref<'_, usize, (async_channel::Sender<stream_dropper::StreamDropper<St>>, async_mutex::Mutex<Channel<St>>)>>`
[INFO] [stdout]     |
[INFO] [stdout]     = note: the temporary is part of an expression at the end of a block;
[INFO] [stdout]             consider forcing this temporary to be dropped sooner, before the block's local variables are dropped
[INFO] [stdout] help: for example, you could save the expression's value in a new local variable `x` and then make `x` be the expression at the end of the block
[INFO] [stdout]     |
[INFO] [stdout] 341 ~         let x = match self.channels.get(&channel_id) {
[INFO] [stdout] 342 |             Some(channel_guard) => {
[INFO] [stdout] ...
[INFO] [stdout] 361 |             None => Err(MultiplexerError::UnknownChannel(channel_id)),
[INFO] [stdout] 362 ~         }; x
[INFO] [stdout]     |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0308]: mismatched types
[INFO] [stdout]    --> src/lib.rs:208:9
[INFO] [stdout]     |
[INFO] [stdout] 206 |     pub fn remove_channel(&mut self, channel: ChannelId) -> bool {
[INFO] [stdout]     |                                                             ---- expected `bool` because of return type
[INFO] [stdout] 207 |         // FIXME: What do we do with the sockets in that channel?
[INFO] [stdout] 208 |         self.channels.remove(&channel)
[INFO] [stdout]     |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ expected `bool`, found `Option<(usize, (Sender<...>, ...))>`
[INFO] [stdout]     |
[INFO] [stdout]     = note: expected type `bool`
[INFO] [stdout]                found enum `Option<(usize, (async_channel::Sender<stream_dropper::StreamDropper<St>>, async_mutex::Mutex<Channel<St>>))>`
[INFO] [stdout] help: use `Option::is_some` to test if the `Option` has a value
[INFO] [stdout]     |
[INFO] [stdout] 208 |         self.channels.remove(&channel).is_some()
[INFO] [stdout]     |                                       ++++++++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] Some errors have detailed explanations: E0308, E0502.
[INFO] [stdout] 
[INFO] [stdout] For more information about an error, try `rustc --explain E0308`.
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `stream_multiplexer` (lib) due to 2 previous errors
[INFO] running `Command { std: "docker" "inspect" "6339f2864fcd8ef644714d1bc4ecb664315d3646609687f9cd7f164165977749", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "6339f2864fcd8ef644714d1bc4ecb664315d3646609687f9cd7f164165977749", kill_on_drop: false }`
[INFO] [stdout] 6339f2864fcd8ef644714d1bc4ecb664315d3646609687f9cd7f164165977749
