[INFO] fetching crate fallible_collections 0.4.0...
[INFO] checking fallible_collections-0.4.0 against master#4d0dd02ee07bddad9136f95c9f7846ebf3eb3fc5 for pr-81174
[INFO] extracting crate fallible_collections 0.4.0 into /workspace/builds/worker-4/source
[INFO] validating manifest of crates.io crate fallible_collections 0.4.0 on toolchain 4d0dd02ee07bddad9136f95c9f7846ebf3eb3fc5
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+4d0dd02ee07bddad9136f95c9f7846ebf3eb3fc5" "read-manifest" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] started tweaking crates.io crate fallible_collections 0.4.0
[INFO] finished tweaking crates.io crate fallible_collections 0.4.0
[INFO] tweaked toml for crates.io crate fallible_collections 0.4.0 written to /workspace/builds/worker-4/source/Cargo.toml
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+4d0dd02ee07bddad9136f95c9f7846ebf3eb3fc5" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update", kill_on_drop: false }`
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+4d0dd02ee07bddad9136f95c9f7846ebf3eb3fc5" "fetch" "--locked" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-4/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-4/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" "rustops/crates-build-env@sha256:21f1ed92105a0ef9b0d27ad8bdeb7f36f9f01ac17fffe3a3f3dc5241fc25d8f4" "/opt/rustwide/cargo-home/bin/cargo" "+4d0dd02ee07bddad9136f95c9f7846ebf3eb3fc5" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] [stdout] 48197d3bff43e177ea2aa1ccd2fd72d2855d722148cc1f0637e8a3fcaf891514
[INFO] running `Command { std: "docker" "start" "-a" "48197d3bff43e177ea2aa1ccd2fd72d2855d722148cc1f0637e8a3fcaf891514", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "48197d3bff43e177ea2aa1ccd2fd72d2855d722148cc1f0637e8a3fcaf891514", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "48197d3bff43e177ea2aa1ccd2fd72d2855d722148cc1f0637e8a3fcaf891514", kill_on_drop: false }`
[INFO] [stdout] 48197d3bff43e177ea2aa1ccd2fd72d2855d722148cc1f0637e8a3fcaf891514
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-4/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-4/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" "CARGO_HOME=/opt/rustwide/cargo-home" "-e" "RUSTUP_HOME=/opt/rustwide/rustup-home" "-w" "/opt/rustwide/workdir" "-m" "1610612736" "--user" "0:0" "--network" "none" "rustops/crates-build-env@sha256:21f1ed92105a0ef9b0d27ad8bdeb7f36f9f01ac17fffe3a3f3dc5241fc25d8f4" "/opt/rustwide/cargo-home/bin/cargo" "+4d0dd02ee07bddad9136f95c9f7846ebf3eb3fc5" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] [stdout] b81a11bcfa2f9581f6ad94e15f7f4485bfe93d4c653e034d4d04a89058120a3f
[INFO] running `Command { std: "docker" "start" "-a" "b81a11bcfa2f9581f6ad94e15f7f4485bfe93d4c653e034d4d04a89058120a3f", kill_on_drop: false }`
[INFO] [stderr]     Checking ahash v0.4.7
[INFO] [stderr]     Checking hashbrown v0.9.1
[INFO] [stderr]     Checking fallible_collections v0.4.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: use of deprecated trait `arc::FallibleArc`: ⚠️️️this function is not completely fallible, it can panic !, see [issue](https://github.com/vcombey/fallible_collections/issues/13). help wanted
[INFO] [stdout]   --> src/arc.rs:21:9
[INFO] [stdout]    |
[INFO] [stdout] 21 | impl<T> FallibleArc<T> for Arc<T> {
[INFO] [stdout]    |         ^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(deprecated)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: use of deprecated trait `arc::FallibleArc`: ⚠️️️this function is not completely fallible, it can panic !, see [issue](https://github.com/vcombey/fallible_collections/issues/13). help wanted
[INFO] [stdout]   --> src/arc.rs:21:9
[INFO] [stdout]    |
[INFO] [stdout] 21 | impl<T> FallibleArc<T> for Arc<T> {
[INFO] [stdout]    |         ^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(deprecated)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: a method with this name may be added to the standard library in the future
[INFO] [stdout]   --> src/boxed.rs:28:20
[INFO] [stdout]    |
[INFO] [stdout] 28 |             inner: Box::try_new(t)?,
[INFO] [stdout]    |                    ^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unstable_name_collisions)]` on by default
[INFO] [stdout]    = warning: once this method is added to the standard library, the ambiguity may cause an error or change in behavior!
[INFO] [stdout]    = note: for more information, see issue #48919 <https://github.com/rust-lang/rust/issues/48919>
[INFO] [stdout]    = help: call with fully qualified syntax `boxed::FallibleBox::try_new(...)` to keep using the current method
[INFO] [stdout]    = help: add `#![feature(allocator_api)]` to the crate attributes to enable `Box::<T>::try_new`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: a method with this name may be added to the standard library in the future
[INFO] [stdout]   --> src/boxed.rs:95:9
[INFO] [stdout]    |
[INFO] [stdout] 95 |         Self::try_new(Borrow::<T>::borrow(self).try_clone()?)
[INFO] [stdout]    |         ^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = warning: once this method is added to the standard library, the ambiguity may cause an error or change in behavior!
[INFO] [stdout]    = note: for more information, see issue #48919 <https://github.com/rust-lang/rust/issues/48919>
[INFO] [stdout]    = help: call with fully qualified syntax `boxed::FallibleBox::try_new(...)` to keep using the current method
[INFO] [stdout]    = help: add `#![feature(allocator_api)]` to the crate attributes to enable `Box::<T>::try_new`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: a method with this name may be added to the standard library in the future
[INFO] [stdout]   --> src/boxed.rs:28:20
[INFO] [stdout]    |
[INFO] [stdout] 28 |             inner: Box::try_new(t)?,
[INFO] [stdout]    |                    ^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unstable_name_collisions)]` on by default
[INFO] [stdout]    = warning: once this method is added to the standard library, the ambiguity may cause an error or change in behavior!
[INFO] [stdout]    = note: for more information, see issue #48919 <https://github.com/rust-lang/rust/issues/48919>
[INFO] [stdout]    = help: call with fully qualified syntax `boxed::FallibleBox::try_new(...)` to keep using the current method
[INFO] [stdout]    = help: add `#![feature(allocator_api)]` to the crate attributes to enable `std::boxed::Box::<T>::try_new`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: a method with this name may be added to the standard library in the future
[INFO] [stdout]   --> src/boxed.rs:95:9
[INFO] [stdout]    |
[INFO] [stdout] 95 |         Self::try_new(Borrow::<T>::borrow(self).try_clone()?)
[INFO] [stdout]    |         ^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = warning: once this method is added to the standard library, the ambiguity may cause an error or change in behavior!
[INFO] [stdout]    = note: for more information, see issue #48919 <https://github.com/rust-lang/rust/issues/48919>
[INFO] [stdout]    = help: call with fully qualified syntax `boxed::FallibleBox::try_new(...)` to keep using the current method
[INFO] [stdout]    = help: add `#![feature(allocator_api)]` to the crate attributes to enable `std::boxed::Box::<T>::try_new`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: a method with this name may be added to the standard library in the future
[INFO] [stdout]    --> src/boxed.rs:104:21
[INFO] [stdout]     |
[INFO] [stdout] 104 |         let mut v = Box::try_new(5).unwrap();
[INFO] [stdout]     |                     ^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = warning: once this method is added to the standard library, the ambiguity may cause an error or change in behavior!
[INFO] [stdout]     = note: for more information, see issue #48919 <https://github.com/rust-lang/rust/issues/48919>
[INFO] [stdout]     = help: call with fully qualified syntax `boxed::FallibleBox::try_new(...)` to keep using the current method
[INFO] [stdout]     = help: add `#![feature(allocator_api)]` to the crate attributes to enable `std::boxed::Box::<T>::try_new`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: a method with this name may be added to the standard library in the future
[INFO] [stdout]    --> src/boxed.rs:118:17
[INFO] [stdout]     |
[INFO] [stdout] 118 |         let b = Box::try_new(()).expect("ok");
[INFO] [stdout]     |                 ^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = warning: once this method is added to the standard library, the ambiguity may cause an error or change in behavior!
[INFO] [stdout]     = note: for more information, see issue #48919 <https://github.com/rust-lang/rust/issues/48919>
[INFO] [stdout]     = help: call with fully qualified syntax `boxed::FallibleBox::try_new(...)` to keep using the current method
[INFO] [stdout]     = help: add `#![feature(allocator_api)]` to the crate attributes to enable `std::boxed::Box::<T>::try_new`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: a method with this name may be added to the standard library in the future
[INFO] [stdout]   --> src/rc.rs:17:17
[INFO] [stdout]    |
[INFO] [stdout] 17 |         let b = Box::try_new(t)?;
[INFO] [stdout]    |                 ^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = warning: once this method is added to the standard library, the ambiguity may cause an error or change in behavior!
[INFO] [stdout]    = note: for more information, see issue #48919 <https://github.com/rust-lang/rust/issues/48919>
[INFO] [stdout]    = help: call with fully qualified syntax `boxed::FallibleBox::try_new(...)` to keep using the current method
[INFO] [stdout]    = help: add `#![feature(allocator_api)]` to the crate attributes to enable `Box::<T>::try_new`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: a method with this name may be added to the standard library in the future
[INFO] [stdout]   --> src/arc.rs:25:17
[INFO] [stdout]    |
[INFO] [stdout] 25 |         let b = Box::try_new(t)?;
[INFO] [stdout]    |                 ^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = warning: once this method is added to the standard library, the ambiguity may cause an error or change in behavior!
[INFO] [stdout]    = note: for more information, see issue #48919 <https://github.com/rust-lang/rust/issues/48919>
[INFO] [stdout]    = help: call with fully qualified syntax `boxed::FallibleBox::try_new(...)` to keep using the current method
[INFO] [stdout]    = help: add `#![feature(allocator_api)]` to the crate attributes to enable `Box::<T>::try_new`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: a method with this name may be added to the standard library in the future
[INFO] [stdout]   --> src/rc.rs:17:17
[INFO] [stdout]    |
[INFO] [stdout] 17 |         let b = Box::try_new(t)?;
[INFO] [stdout]    |                 ^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = warning: once this method is added to the standard library, the ambiguity may cause an error or change in behavior!
[INFO] [stdout]    = note: for more information, see issue #48919 <https://github.com/rust-lang/rust/issues/48919>
[INFO] [stdout]    = help: call with fully qualified syntax `boxed::FallibleBox::try_new(...)` to keep using the current method
[INFO] [stdout]    = help: add `#![feature(allocator_api)]` to the crate attributes to enable `std::boxed::Box::<T>::try_new`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: a method with this name may be added to the standard library in the future
[INFO] [stdout]   --> src/arc.rs:25:17
[INFO] [stdout]    |
[INFO] [stdout] 25 |         let b = Box::try_new(t)?;
[INFO] [stdout]    |                 ^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = warning: once this method is added to the standard library, the ambiguity may cause an error or change in behavior!
[INFO] [stdout]    = note: for more information, see issue #48919 <https://github.com/rust-lang/rust/issues/48919>
[INFO] [stdout]    = help: call with fully qualified syntax `boxed::FallibleBox::try_new(...)` to keep using the current method
[INFO] [stdout]    = help: add `#![feature(allocator_api)]` to the crate attributes to enable `std::boxed::Box::<T>::try_new`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 5 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 7 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 2.19s
[INFO] running `Command { std: "docker" "inspect" "b81a11bcfa2f9581f6ad94e15f7f4485bfe93d4c653e034d4d04a89058120a3f", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "b81a11bcfa2f9581f6ad94e15f7f4485bfe93d4c653e034d4d04a89058120a3f", kill_on_drop: false }`
[INFO] [stdout] b81a11bcfa2f9581f6ad94e15f7f4485bfe93d4c653e034d4d04a89058120a3f