[INFO] fetching crate toolshed 0.8.1...
[INFO] testing toolshed-0.8.1 against master#ec6f9a5b4413f74386267ef8efc93712c2ce6db6 for pr-155739-1
[INFO] extracting crate toolshed 0.8.1 into /workspace/builds/worker-2-tc1/source
[INFO] started tweaking crates.io crate toolshed 0.8.1
[INFO] finished tweaking crates.io crate toolshed 0.8.1
[INFO] tweaked toml for crates.io crate toolshed 0.8.1 written to /workspace/builds/worker-2-tc1/source/Cargo.toml
[INFO] validating manifest of crates.io crate toolshed 0.8.1 on toolchain ec6f9a5b4413f74386267ef8efc93712c2ce6db6
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+ec6f9a5b4413f74386267ef8efc93712c2ce6db6" "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" "+ec6f9a5b4413f74386267ef8efc93712c2ce6db6" "generate-lockfile" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[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]      Locking 12 packages to latest compatible versions
[INFO] [stderr]       Adding rustc-hash v1.1.0 (available: v2.1.2)
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+ec6f9a5b4413f74386267ef8efc93712c2ce6db6" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]  Downloading crates ...
[INFO] [stderr]   Downloaded rustc-hash v1.1.0
[INFO] [stderr]   Downloaded zmij v1.0.21
[INFO] [stderr]   Downloaded serde_json v1.0.149
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-2-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-2-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" "+ec6f9a5b4413f74386267ef8efc93712c2ce6db6" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 563d1143862ba1b26f0795d0e8a10c94f83c113420df16ea4668ea5b47a5f6cd
[INFO] running `Command { std: "docker" "start" "-a" "563d1143862ba1b26f0795d0e8a10c94f83c113420df16ea4668ea5b47a5f6cd", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "563d1143862ba1b26f0795d0e8a10c94f83c113420df16ea4668ea5b47a5f6cd", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "563d1143862ba1b26f0795d0e8a10c94f83c113420df16ea4668ea5b47a5f6cd", kill_on_drop: false }`
[INFO] [stdout] 563d1143862ba1b26f0795d0e8a10c94f83c113420df16ea4668ea5b47a5f6cd
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-2-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-2-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" "+ec6f9a5b4413f74386267ef8efc93712c2ce6db6" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 8db8b0a12a2c64f2fb4d9c9c5cf08bfef135ba15eb6b9ab00e2aba1eeced5e6f
[INFO] running `Command { std: "docker" "start" "-a" "8db8b0a12a2c64f2fb4d9c9c5cf08bfef135ba15eb6b9ab00e2aba1eeced5e6f", kill_on_drop: false }`
[INFO] [stderr]    Compiling rustc-hash v1.1.0
[INFO] [stderr]    Compiling toolshed v0.8.1 (/opt/rustwide/workdir)
[INFO] [stdout] error: assigning to `&T` is undefined behavior, consider using an `UnsafeCell`
[INFO] [stdout]   --> src/cell.rs:56:18
[INFO] [stdout]    |
[INFO] [stdout] 56 |         unsafe { write_volatile(self as *const CopyCell<T> as *const T as *mut T, value) };
[INFO] [stdout]    |                  ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: for more information, visit <https://doc.rust-lang.org/book/ch15-05-interior-mutability.html>
[INFO] [stdout]    = note: even for types with interior mutability, the only legal way to obtain a mutable pointer from a shared reference is through `UnsafeCell::get`
[INFO] [stdout]    = note: `#[deny(invalid_reference_casting)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `toolshed` (lib) due to 1 previous error; 1 warning emitted
[INFO] [stdout] warning: hiding a lifetime that's named elsewhere is confusing
[INFO] [stdout]    --> src/arena.rs:266:67
[INFO] [stdout]     |
[INFO] [stdout] 266 |     pub fn alloc_nul_term_str<'arena>(&'arena self, val: &str) -> NulTermStr {
[INFO] [stdout]     |                                        ------                     ^^^^^^^^^^ the same lifetime is hidden here
[INFO] [stdout]     |                                        |
[INFO] [stdout]     |                                        the lifetime is named here
[INFO] [stdout]     |
[INFO] [stdout]     = help: the same lifetime is referred to in inconsistent ways, making the signature confusing
[INFO] [stdout]     = note: `#[warn(mismatched_lifetime_syntaxes)]` on by default
[INFO] [stdout] help: consistently use `'arena`
[INFO] [stdout]     |
[INFO] [stdout] 266 |     pub fn alloc_nul_term_str<'arena>(&'arena self, val: &str) -> NulTermStr<'arena> {
[INFO] [stdout]     |                                                                             ++++++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] running `Command { std: "docker" "inspect" "8db8b0a12a2c64f2fb4d9c9c5cf08bfef135ba15eb6b9ab00e2aba1eeced5e6f", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "8db8b0a12a2c64f2fb4d9c9c5cf08bfef135ba15eb6b9ab00e2aba1eeced5e6f", kill_on_drop: false }`
[INFO] [stdout] 8db8b0a12a2c64f2fb4d9c9c5cf08bfef135ba15eb6b9ab00e2aba1eeced5e6f
