[INFO] crate qp-trie 0.7.3 is already in cache
[INFO] checking qp-trie-0.7.3 against master#b61e69433951e31f7bd746e22f516a48ad41623b for prs-64470-and-65389
[INFO] extracting crate qp-trie 0.7.3 into /workspace/builds/worker-12/source
[INFO] validating manifest of crates.io crate qp-trie 0.7.3 on toolchain b61e69433951e31f7bd746e22f516a48ad41623b
[INFO] running `"/workspace/cargo-home/bin/cargo" "+b61e69433951e31f7bd746e22f516a48ad41623b" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] started tweaking crates.io crate qp-trie 0.7.3
[INFO] finished tweaking crates.io crate qp-trie 0.7.3
[INFO] tweaked toml for crates.io crate qp-trie 0.7.3 written to /workspace/builds/worker-12/source/Cargo.toml
[INFO] running `"/workspace/cargo-home/bin/cargo" "+b61e69433951e31f7bd746e22f516a48ad41623b" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update"`
[INFO] running `"/workspace/cargo-home/bin/cargo" "+b61e69433951e31f7bd746e22f516a48ad41623b" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] running `"docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-12/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-12/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" "MAP_USER_ID=0" "-e" "CARGO_TARGET_DIR=/opt/rustwide/target" "-e" "CARGO_INCREMENTAL=0" "-e" "RUST_BACKTRACE=full" "-e" "RUSTFLAGS=--cap-lints=forbid" "-e" "CARGO_HOME=/opt/rustwide/cargo-home" "-e" "RUSTUP_HOME=/opt/rustwide/rustup-home" "-w" "/opt/rustwide/workdir" "-m" "1610612736" "--network" "none" "rustops/crates-build-env" "/opt/rustwide/cargo-home/bin/cargo" "+b61e69433951e31f7bd746e22f516a48ad41623b" "check" "--frozen" "--all" "--all-targets"`
[INFO] [stdout] 8ee623fb0f775c7a180dcc630e868f97889a313073e59c6d3fbf5c86830d7dc6
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] running `"docker" "start" "-a" "8ee623fb0f775c7a180dcc630e868f97889a313073e59c6d3fbf5c86830d7dc6"`
[INFO] [stderr]     Checking unreachable v0.1.1
[INFO] [stderr]     Checking rand_core v0.2.2
[INFO] [stderr]     Checking qp-trie v0.7.3 (/opt/rustwide/workdir)
[INFO] [stderr]     Checking debug_unreachable v0.1.1
[INFO] [stderr]     Checking quickcheck v0.7.2
[INFO] [stderr]     Checking qptrie v0.2.4
[INFO] [stderr] error[E0499]: cannot borrow `*self` as mutable more than once at a time
[INFO] [stderr]    --> src/node.rs:502:41
[INFO] [stderr]     |
[INFO] [stderr] 479 |           &mut self,
[INFO] [stderr]     |           - let's call the lifetime of this reference `'1`
[INFO] [stderr] ...
[INFO] [stderr] 485 | /         match *self {
[INFO] [stderr] 486 | |             Node::Branch(ref mut branch) if branch.choice <= graft => {
[INFO] [stderr]     | |                          -------------- first mutable borrow occurs here
[INFO] [stderr] 487 | |                 let index = branch.index(key.borrow());
[INFO] [stderr] 488 | |
[INFO] [stderr] ...   |
[INFO] [stderr] 502 | |                 let node = mem::replace(self, Node::Branch(Branch::new(graft)));
[INFO] [stderr]     | |                                         ^^^^ second mutable borrow occurs here
[INFO] [stderr] ...   |
[INFO] [stderr] 517 | |             }
[INFO] [stderr] 518 | |         }
[INFO] [stderr]     | |_________- returning this value requires that `self.0` is borrowed for `'1`
[INFO] [stderr] 
[INFO] [stderr] error[E0499]: cannot borrow `*self` as mutable more than once at a time
[INFO] [stderr]    --> src/node.rs:505:45
[INFO] [stderr]     |
[INFO] [stderr] 479 |           &mut self,
[INFO] [stderr]     |           - let's call the lifetime of this reference `'1`
[INFO] [stderr] ...
[INFO] [stderr] 485 | /         match *self {
[INFO] [stderr] 486 | |             Node::Branch(ref mut branch) if branch.choice <= graft => {
[INFO] [stderr]     | |                          -------------- first mutable borrow occurs here
[INFO] [stderr] 487 | |                 let index = branch.index(key.borrow());
[INFO] [stderr] 488 | |
[INFO] [stderr] ...   |
[INFO] [stderr] 505 | |                 let graft_branch = unsafe { self.unwrap_branch_mut() };
[INFO] [stderr]     | |                                             ^^^^ second mutable borrow occurs here
[INFO] [stderr] ...   |
[INFO] [stderr] 517 | |             }
[INFO] [stderr] 518 | |         }
[INFO] [stderr]     | |_________- returning this value requires that `self.0` is borrowed for `'1`
[INFO] [stderr] 
[INFO] [stderr] error: aborting due to 2 previous errors
[INFO] [stderr] 
[INFO] [stderr] For more information about this error, try `rustc --explain E0499`.
[INFO] [stderr] error: could not compile `qp-trie`.
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[INFO] [stderr] error: build failed
[INFO] running `"docker" "inspect" "8ee623fb0f775c7a180dcc630e868f97889a313073e59c6d3fbf5c86830d7dc6"`
[INFO] running `"docker" "rm" "-f" "8ee623fb0f775c7a180dcc630e868f97889a313073e59c6d3fbf5c86830d7dc6"`
[INFO] [stdout] 8ee623fb0f775c7a180dcc630e868f97889a313073e59c6d3fbf5c86830d7dc6