[INFO] fetching crate flexon 0.4.9...
[INFO] testing flexon-0.4.9 against 1.100.0-beta.1+cargoflags=--release for beta-release-1.100-2
[INFO] extracting crate flexon 0.4.9 into /workspace/builds/worker-0-tc2/source
[INFO] started tweaking crates.io crate flexon 0.4.9
[INFO] finished tweaking crates.io crate flexon 0.4.9
[INFO] tweaked toml for crates.io crate flexon 0.4.9 written to /workspace/builds/worker-0-tc2/source/Cargo.toml
[INFO] validating manifest of crates.io crate flexon 0.4.9 on toolchain 1.100.0-beta.1
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+1.100.0-beta.1" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] crate crates.io crate flexon 0.4.9 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" "+1.100.0-beta.1" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-0-tc2/source:/opt/rustwide/workdir:ro,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-0-tc2/target:/opt/rustwide/target:rw,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" "-m" "1610612736" "--network" "none" "ghcr.io/rust-lang/crates-build-env/linux@sha256:77db811e55d90add9212f6832c23229e3de5f1c1f9905e8cb07319ea15df73ac" "sleep" "infinity", kill_on_drop: false }`
[INFO] [stdout] d2eb8afae49135f85c140b2bab810383450de2e6a8164d5eea9220bfc07c808d
[INFO] running `Command { std: "docker" "start" "d2eb8afae49135f85c140b2bab810383450de2e6a8164d5eea9220bfc07c808d", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "d2eb8afae49135f85c140b2bab810383450de2e6a8164d5eea9220bfc07c808d", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "exec" "-e" "SOURCE_DIR=/opt/rustwide/workdir" "-e" "CARGO_HOME=/opt/rustwide/cargo-home" "-e" "RUSTUP_HOME=/opt/rustwide/rustup-home" "-e" "CARGO_TARGET_DIR=/opt/rustwide/target" "-w" "/opt/rustwide/workdir" "--user" "0:0" "d2eb8afae49135f85c140b2bab810383450de2e6a8164d5eea9220bfc07c808d" "/opt/rustwide/cargo-home/bin/cargo" "+1.100.0-beta.1" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "d2eb8afae49135f85c140b2bab810383450de2e6a8164d5eea9220bfc07c808d", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "exec" "-e" "SOURCE_DIR=/opt/rustwide/workdir" "-e" "CARGO_HOME=/opt/rustwide/cargo-home" "-e" "RUSTUP_HOME=/opt/rustwide/rustup-home" "-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" "-w" "/opt/rustwide/workdir" "--user" "0:0" "d2eb8afae49135f85c140b2bab810383450de2e6a8164d5eea9220bfc07c808d" "/opt/rustwide/cargo-home/bin/cargo" "+1.100.0-beta.1" "build" "--frozen" "--message-format=json" "--release", kill_on_drop: false }`
[INFO] [stderr]    Compiling serde_core v1.0.229
[INFO] [stderr]    Compiling simdutf8 v0.1.5
[INFO] [stderr]    Compiling flexon v0.4.9 (/opt/rustwide/workdir)
[INFO] [stdout] error[E0499]: cannot borrow `self.buf` as mutable more than once at a time
[INFO] [stdout]   --> src/value/lazy/array.rs:49:31
[INFO] [stdout]    |
[INFO] [stdout] 34 |       pub fn get(&mut self, mut idx: usize) -> Option<&mut Value<'a>> {
[INFO] [stdout]    |                  - let's call the lifetime of this reference `'1`
[INFO] [stdout] 35 |           for (i, v) in &mut self.buf {
[INFO] [stdout]    |                         ------------- first mutable borrow occurs here
[INFO] [stdout] 36 |               if *i == idx {
[INFO] [stdout] 37 |                   return Some(v);
[INFO] [stdout]    |                          ------- returning this value requires that `self.buf` is borrowed for `'1`
[INFO] [stdout] ...
[INFO] [stdout] 49 |                       let res = self
[INFO] [stdout]    |  _______________________________^
[INFO] [stdout] 50 | |                         .buf
[INFO] [stdout]    | |____________________________^ second mutable borrow occurs here
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0499]: cannot borrow `self.buf` as mutable more than once at a time
[INFO] [stdout]   --> src/value/lazy/object.rs:60:35
[INFO] [stdout]    |
[INFO] [stdout] 40 |       pub fn get(&mut self, key: &str) -> Option<&mut Value<'a>> {
[INFO] [stdout]    |                  - let's call the lifetime of this reference `'1`
[INFO] [stdout] 41 |           for (k, v) in &mut self.buf {
[INFO] [stdout]    |                         ------------- first mutable borrow occurs here
[INFO] [stdout] 42 |               if k.as_str() == key {
[INFO] [stdout] 43 |                   return Some(v);
[INFO] [stdout]    |                          ------- returning this value requires that `self.buf` is borrowed for `'1`
[INFO] [stdout] ...
[INFO] [stdout] 60 |                           let res = self
[INFO] [stdout]    |  ___________________________________^
[INFO] [stdout] 61 | |                             .buf
[INFO] [stdout]    | |________________________________^ second mutable borrow occurs here
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] For more information about this error, try `rustc --explain E0499`.
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `flexon` (lib) due to 2 previous errors
[INFO] running `Command { std: "docker" "inspect" "d2eb8afae49135f85c140b2bab810383450de2e6a8164d5eea9220bfc07c808d", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "d2eb8afae49135f85c140b2bab810383450de2e6a8164d5eea9220bfc07c808d", kill_on_drop: false }`
[INFO] [stdout] d2eb8afae49135f85c140b2bab810383450de2e6a8164d5eea9220bfc07c808d
