[INFO] fetching crate exist 0.1.2...
[INFO] checking exist-0.1.2 against try#07fecb9cf34c4979a772ba38c99d6d9144768413 for pr-87710
[INFO] extracting crate exist 0.1.2 into /workspace/builds/worker-0/source
[INFO] validating manifest of crates.io crate exist 0.1.2 on toolchain 07fecb9cf34c4979a772ba38c99d6d9144768413
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+07fecb9cf34c4979a772ba38c99d6d9144768413" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking crates.io crate exist 0.1.2
[INFO] finished tweaking crates.io crate exist 0.1.2
[INFO] tweaked toml for crates.io crate exist 0.1.2 written to /workspace/builds/worker-0/source/Cargo.toml
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+07fecb9cf34c4979a772ba38c99d6d9144768413" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update", kill_on_drop: false }`
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+07fecb9cf34c4979a772ba38c99d6d9144768413" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-0/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-0/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@sha256:34b6a614d2c27851fe6cbf88fbd1137609cefab8b10d0615aaeb6fd47975d74e" "/opt/rustwide/cargo-home/bin/cargo" "+07fecb9cf34c4979a772ba38c99d6d9144768413" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 98c38d4a2953b8e98070190ef361e849bca80c37f95afdcd140b184aff14caec
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] running `Command { std: "docker" "start" "-a" "98c38d4a2953b8e98070190ef361e849bca80c37f95afdcd140b184aff14caec", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "98c38d4a2953b8e98070190ef361e849bca80c37f95afdcd140b184aff14caec", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "98c38d4a2953b8e98070190ef361e849bca80c37f95afdcd140b184aff14caec", kill_on_drop: false }`
[INFO] [stdout] 98c38d4a2953b8e98070190ef361e849bca80c37f95afdcd140b184aff14caec
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-0/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-0/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" "ghcr.io/rust-lang/crates-build-env/linux@sha256:34b6a614d2c27851fe6cbf88fbd1137609cefab8b10d0615aaeb6fd47975d74e" "/opt/rustwide/cargo-home/bin/cargo" "+07fecb9cf34c4979a772ba38c99d6d9144768413" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 58f0cfeb97cc66419b1dd3ddf6b7aafbb20f6be5a748f1b88ec6edb899964f43
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] running `Command { std: "docker" "start" "-a" "58f0cfeb97cc66419b1dd3ddf6b7aafbb20f6be5a748f1b88ec6edb899964f43", kill_on_drop: false }`
[INFO] [stderr]    Compiling typenum v1.13.0
[INFO] [stderr]    Compiling proc-macro2 v1.0.28
[INFO] [stderr]    Compiling unicode-xid v0.2.2
[INFO] [stderr]    Compiling ryu v1.0.5
[INFO] [stderr]    Compiling syn v1.0.75
[INFO] [stderr]    Compiling serde_json v1.0.66
[INFO] [stderr]    Compiling serde_derive v1.0.129
[INFO] [stderr]     Checking itoa v0.4.8
[INFO] [stderr]     Checking byteorder v1.4.3
[INFO] [stderr]     Checking bincode v1.3.3
[INFO] [stderr]     Checking serde_cbor v0.9.0
[INFO] [stderr]    Compiling quote v1.0.9
[INFO] [stderr]     Checking generic-array v0.12.4
[INFO] [stderr]     Checking digest v0.8.1
[INFO] [stderr]     Checking crypto-mac v0.7.0
[INFO] [stderr]     Checking blake2 v0.8.1
[INFO] [stderr]     Checking exist v0.1.2 (/opt/rustwide/workdir)
[INFO] [stdout] error: ambiguous associated item
[INFO] [stdout]   --> src/data_models/leaf_tree.rs:34:37
[INFO] [stdout]    |
[INFO] [stdout] 34 |         fn visit<V: Visitor<Value = Self::Value>>(&self, v: &mut V) {
[INFO] [stdout]    |                                     ^^^^^^^^^^^ help: use fully-qualified syntax: `<leaf_tree::concrete::Concrete<Value> as View>::Value`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[deny(ambiguous_associated_items)]` on by default
[INFO] [stdout]    = warning: this was previously accepted by the compiler but is being phased out; it will become a hard error in a future release!
[INFO] [stdout]    = note: for more information, see issue #57644 <https://github.com/rust-lang/rust/issues/57644>
[INFO] [stdout] note: `Value` could refer to the variant defined here
[INFO] [stdout]   --> src/data_models/leaf_tree.rs:26:9
[INFO] [stdout]    |
[INFO] [stdout] 26 |         Value(V),
[INFO] [stdout]    |         ^^^^^^^^
[INFO] [stdout] note: `Value` could also refer to the associated type defined here
[INFO] [stdout]   --> src/data_models/mod.rs:14:15
[INFO] [stdout]    |
[INFO] [stdout] 14 |             $(type $Items;)*
[INFO] [stdout]    |               ^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]   ::: src/data_models/leaf_tree.rs:7:1
[INFO] [stdout]    |
[INFO] [stdout] 7  | Visitable!(View, Visitor, Value);
[INFO] [stdout]    | --------------------------------- in this macro invocation
[INFO] [stdout]    = note: this error originates in the macro `Visitable` (in Nightly builds, run with -Z macro-backtrace for more info)
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: aborting due to previous error
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `exist` due to 2 previous errors
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[INFO] [stdout] error: ambiguous associated item
[INFO] [stdout]   --> src/data_models/leaf_tree.rs:34:37
[INFO] [stdout]    |
[INFO] [stdout] 34 |         fn visit<V: Visitor<Value = Self::Value>>(&self, v: &mut V) {
[INFO] [stdout]    |                                     ^^^^^^^^^^^ help: use fully-qualified syntax: `<leaf_tree::concrete::Concrete<Value> as View>::Value`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[deny(ambiguous_associated_items)]` on by default
[INFO] [stdout]    = warning: this was previously accepted by the compiler but is being phased out; it will become a hard error in a future release!
[INFO] [stdout]    = note: for more information, see issue #57644 <https://github.com/rust-lang/rust/issues/57644>
[INFO] [stdout] note: `Value` could refer to the variant defined here
[INFO] [stdout]   --> src/data_models/leaf_tree.rs:26:9
[INFO] [stdout]    |
[INFO] [stdout] 26 |         Value(V),
[INFO] [stdout]    |         ^^^^^^^^
[INFO] [stdout] note: `Value` could also refer to the associated type defined here
[INFO] [stdout]   --> src/data_models/mod.rs:14:15
[INFO] [stdout]    |
[INFO] [stdout] 14 |             $(type $Items;)*
[INFO] [stdout]    |               ^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]   ::: src/data_models/leaf_tree.rs:7:1
[INFO] [stdout]    |
[INFO] [stdout] 7  | Visitable!(View, Visitor, Value);
[INFO] [stdout]    | --------------------------------- in this macro invocation
[INFO] [stdout]    = note: this error originates in the macro `Visitable` (in Nightly builds, run with -Z macro-backtrace for more info)
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: aborting due to previous error
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr] error: build failed
[INFO] running `Command { std: "docker" "inspect" "58f0cfeb97cc66419b1dd3ddf6b7aafbb20f6be5a748f1b88ec6edb899964f43", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "58f0cfeb97cc66419b1dd3ddf6b7aafbb20f6be5a748f1b88ec6edb899964f43", kill_on_drop: false }`
[INFO] [stdout] 58f0cfeb97cc66419b1dd3ddf6b7aafbb20f6be5a748f1b88ec6edb899964f43