[INFO] cloning repository https://github.com/MatthewJohnHeath/ArrayTree
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/MatthewJohnHeath/ArrayTree" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FMatthewJohnHeath%2FArrayTree", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FMatthewJohnHeath%2FArrayTree'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 4c7ef1dc85cb607a064c0f9b703ab599477a9726
[INFO] checking MatthewJohnHeath/ArrayTree against try#901e6d56697c79b2e80df6a487b2318ec6f57ee3 for pr-142287
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FMatthewJohnHeath%2FArrayTree" "/workspace/builds/worker-5-tc2/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-5-tc2/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/MatthewJohnHeath/ArrayTree on toolchain 901e6d56697c79b2e80df6a487b2318ec6f57ee3
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+901e6d56697c79b2e80df6a487b2318ec6f57ee3" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/MatthewJohnHeath/ArrayTree
[INFO] finished tweaking git repo https://github.com/MatthewJohnHeath/ArrayTree
[INFO] tweaked toml for git repo https://github.com/MatthewJohnHeath/ArrayTree written to /workspace/builds/worker-5-tc2/source/Cargo.toml
[INFO] crate git repo https://github.com/MatthewJohnHeath/ArrayTree 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" "+901e6d56697c79b2e80df6a487b2318ec6f57ee3" "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:eea15d5475069c3ef791f10c2c6b5af2ee421ef2da1e680ecce1cba46243983b" "/opt/rustwide/cargo-home/bin/cargo" "+901e6d56697c79b2e80df6a487b2318ec6f57ee3" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 65a190c1333b26023ec5db00cd7c18c37c7f218aa8b85eae403915d0b33dd66a
[INFO] running `Command { std: "docker" "start" "-a" "65a190c1333b26023ec5db00cd7c18c37c7f218aa8b85eae403915d0b33dd66a", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "65a190c1333b26023ec5db00cd7c18c37c7f218aa8b85eae403915d0b33dd66a", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "65a190c1333b26023ec5db00cd7c18c37c7f218aa8b85eae403915d0b33dd66a", kill_on_drop: false }`
[INFO] [stdout] 65a190c1333b26023ec5db00cd7c18c37c7f218aa8b85eae403915d0b33dd66a
[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=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:eea15d5475069c3ef791f10c2c6b5af2ee421ef2da1e680ecce1cba46243983b" "/opt/rustwide/cargo-home/bin/cargo" "+901e6d56697c79b2e80df6a487b2318ec6f57ee3" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] d6c78c6649fa284506d0a3d1caa5be3041a594d388b214910dd5ed85d98ded47
[INFO] running `Command { std: "docker" "start" "-a" "d6c78c6649fa284506d0a3d1caa5be3041a594d388b214910dd5ed85d98ded47", kill_on_drop: false }`
[INFO] [stderr]     Checking tree v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] error[E0515]: cannot return value referencing temporary value
[INFO] [stdout]   --> src/arraytree.rs:62:9
[INFO] [stdout]    |
[INFO] [stdout] 60 |             else{&RBTreeArrayElement::Empty}
[INFO] [stdout]    |                   ------------------------- temporary value created here
[INFO] [stdout] 61 |         };
[INFO] [stdout] 62 |         Self{element, nodes: self.nodes}
[INFO] [stdout]    |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ returns a value referencing data owned by the current function
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0515]: cannot return value referencing temporary value
[INFO] [stdout]   --> src/arraytree.rs:62:9
[INFO] [stdout]    |
[INFO] [stdout] 57 |                     None => &RBTreeArrayElement::Empty
[INFO] [stdout]    |                              ------------------------- temporary value created here
[INFO] [stdout] ...
[INFO] [stdout] 62 |         Self{element, nodes: self.nodes}
[INFO] [stdout]    |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ returns a value referencing data owned by the current function
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0515]: cannot return value referencing temporary value
[INFO] [stdout]   --> src/arraytree.rs:75:9
[INFO] [stdout]    |
[INFO] [stdout] 73 |             else{&RBTreeArrayElement::Empty}
[INFO] [stdout]    |                   ------------------------- temporary value created here
[INFO] [stdout] 74 |         };
[INFO] [stdout] 75 |         Self{element, nodes: self.nodes}
[INFO] [stdout]    |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ returns a value referencing data owned by the current function
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0515]: cannot return value referencing temporary value
[INFO] [stdout]   --> src/arraytree.rs:75:9
[INFO] [stdout]    |
[INFO] [stdout] 70 |                     None => &RBTreeArrayElement::Empty
[INFO] [stdout]    |                              ------------------------- temporary value created here
[INFO] [stdout] ...
[INFO] [stdout] 75 |         Self{element, nodes: self.nodes}
[INFO] [stdout]    |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ returns a value referencing data owned by the current function
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0515]: cannot return value referencing temporary value
[INFO] [stdout]   --> src/arraytree.rs:88:9
[INFO] [stdout]    |
[INFO] [stdout] 86 |             else{&RBTreeArrayElement::Empty}
[INFO] [stdout]    |                   ------------------------- temporary value created here
[INFO] [stdout] 87 |         };
[INFO] [stdout] 88 |         Self{element, nodes: self.nodes}
[INFO] [stdout]    |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ returns a value referencing data owned by the current function
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0515]: cannot return value referencing temporary value
[INFO] [stdout]   --> src/arraytree.rs:88:9
[INFO] [stdout]    |
[INFO] [stdout] 83 |                     None => &RBTreeArrayElement::Empty
[INFO] [stdout]    |                              ------------------------- temporary value created here
[INFO] [stdout] ...
[INFO] [stdout] 88 |         Self{element, nodes: self.nodes}
[INFO] [stdout]    |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ returns a value referencing data owned by the current function
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0515]: cannot return value referencing temporary value
[INFO] [stdout]    --> src/arraytree.rs:115:9
[INFO] [stdout]     |
[INFO] [stdout] 113 |             else{&RBTreeArrayElement::Empty}
[INFO] [stdout]     |                   ------------------------- temporary value created here
[INFO] [stdout] 114 |         };
[INFO] [stdout] 115 |         Self{element, nodes: self.nodes}
[INFO] [stdout]     |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ returns a value referencing data owned by the current function
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0515]: cannot return value referencing temporary value
[INFO] [stdout]    --> src/arraytree.rs:115:9
[INFO] [stdout]     |
[INFO] [stdout] 110 |                     None => &RBTreeArrayElement::Empty
[INFO] [stdout]     |                              ------------------------- temporary value created here
[INFO] [stdout] ...
[INFO] [stdout] 115 |         Self{element, nodes: self.nodes}
[INFO] [stdout]     |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ returns a value referencing data owned by the current function
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] For more information about this error, try `rustc --explain E0515`.
[INFO] [stdout] 
[INFO] [stdout] error[E0515]: cannot return value referencing temporary value
[INFO] [stdout]   --> src/arraytree.rs:62:9
[INFO] [stdout]    |
[INFO] [stdout] 60 |             else{&RBTreeArrayElement::Empty}
[INFO] [stdout]    |                   ------------------------- temporary value created here
[INFO] [stdout] 61 |         };
[INFO] [stdout] 62 |         Self{element, nodes: self.nodes}
[INFO] [stdout]    |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ returns a value referencing data owned by the current function
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0515]: cannot return value referencing temporary value
[INFO] [stdout]   --> src/arraytree.rs:62:9
[INFO] [stdout]    |
[INFO] [stdout] 57 |                     None => &RBTreeArrayElement::Empty
[INFO] [stdout]    |                              ------------------------- temporary value created here
[INFO] [stdout] ...
[INFO] [stdout] 62 |         Self{element, nodes: self.nodes}
[INFO] [stdout]    |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ returns a value referencing data owned by the current function
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0515]: cannot return value referencing temporary value
[INFO] [stdout]   --> src/arraytree.rs:75:9
[INFO] [stdout]    |
[INFO] [stdout] 73 |             else{&RBTreeArrayElement::Empty}
[INFO] [stdout]    |                   ------------------------- temporary value created here
[INFO] [stdout] 74 |         };
[INFO] [stdout] 75 |         Self{element, nodes: self.nodes}
[INFO] [stdout]    |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ returns a value referencing data owned by the current function
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0515]: cannot return value referencing temporary value
[INFO] [stdout]   --> src/arraytree.rs:75:9
[INFO] [stdout]    |
[INFO] [stdout] 70 |                     None => &RBTreeArrayElement::Empty
[INFO] [stdout]    |                              ------------------------- temporary value created here
[INFO] [stdout] ...
[INFO] [stdout] 75 |         Self{element, nodes: self.nodes}
[INFO] [stdout]    |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ returns a value referencing data owned by the current function
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0515]: cannot return value referencing temporary value
[INFO] [stdout]   --> src/arraytree.rs:88:9
[INFO] [stdout]    |
[INFO] [stdout] 86 |             else{&RBTreeArrayElement::Empty}
[INFO] [stdout]    |                   ------------------------- temporary value created here
[INFO] [stdout] 87 |         };
[INFO] [stdout] 88 |         Self{element, nodes: self.nodes}
[INFO] [stdout]    |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ returns a value referencing data owned by the current function
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0515]: cannot return value referencing temporary value
[INFO] [stdout]   --> src/arraytree.rs:88:9
[INFO] [stdout]    |
[INFO] [stdout] 83 |                     None => &RBTreeArrayElement::Empty
[INFO] [stdout]    |                              ------------------------- temporary value created here
[INFO] [stdout] ...
[INFO] [stdout] 88 |         Self{element, nodes: self.nodes}
[INFO] [stdout]    |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ returns a value referencing data owned by the current function
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0515]: cannot return value referencing temporary value
[INFO] [stdout]    --> src/arraytree.rs:115:9
[INFO] [stdout]     |
[INFO] [stdout] 113 |             else{&RBTreeArrayElement::Empty}
[INFO] [stdout]     |                   ------------------------- temporary value created here
[INFO] [stdout] 114 |         };
[INFO] [stdout] 115 |         Self{element, nodes: self.nodes}
[INFO] [stdout]     |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ returns a value referencing data owned by the current function
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0515]: cannot return value referencing temporary value
[INFO] [stdout]    --> src/arraytree.rs:115:9
[INFO] [stdout]     |
[INFO] [stdout] 110 |                     None => &RBTreeArrayElement::Empty
[INFO] [stdout]     |                              ------------------------- temporary value created here
[INFO] [stdout] ...
[INFO] [stdout] 115 |         Self{element, nodes: self.nodes}
[INFO] [stdout]     |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ returns a value referencing data owned by the current function
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] For more information about this error, try `rustc --explain E0515`.
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `tree` (lib) due to 8 previous errors
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[INFO] [stderr] error: could not compile `tree` (lib test) due to 8 previous errors
[INFO] running `Command { std: "docker" "inspect" "d6c78c6649fa284506d0a3d1caa5be3041a594d388b214910dd5ed85d98ded47", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "d6c78c6649fa284506d0a3d1caa5be3041a594d388b214910dd5ed85d98ded47", kill_on_drop: false }`
[INFO] [stdout] d6c78c6649fa284506d0a3d1caa5be3041a594d388b214910dd5ed85d98ded47