[INFO] crate incrust 0.2.15 is already in cache
[INFO] checking incrust-0.2.15 against try#5e633973aa9255a88b65a39484627bb54e6044b3 for pr-66063
[INFO] extracting crate incrust 0.2.15 into /workspace/builds/worker-1/source
[INFO] validating manifest of crates.io crate incrust 0.2.15 on toolchain 5e633973aa9255a88b65a39484627bb54e6044b3
[INFO] running `"/workspace/cargo-home/bin/cargo" "+5e633973aa9255a88b65a39484627bb54e6044b3" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] started tweaking crates.io crate incrust 0.2.15
[INFO] finished tweaking crates.io crate incrust 0.2.15
[INFO] tweaked toml for crates.io crate incrust 0.2.15 written to /workspace/builds/worker-1/source/Cargo.toml
[INFO] running `"/workspace/cargo-home/bin/cargo" "+5e633973aa9255a88b65a39484627bb54e6044b3" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update"`
[INFO] running `"/workspace/cargo-home/bin/cargo" "+5e633973aa9255a88b65a39484627bb54e6044b3" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] running `"docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-1/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=allow" "-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" "+5e633973aa9255a88b65a39484627bb54e6044b3" "check" "--frozen" "--all" "--all-targets"`
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] [stdout] 1567bb8961fbb8861b3d6e9b42d1bca6043d5cc6d7c314feb16904957380eb2c
[INFO] running `"docker" "start" "-a" "1567bb8961fbb8861b3d6e9b42d1bca6043d5cc6d7c314feb16904957380eb2c"`
[INFO] [stderr]     Checking marksman_escape v0.1.2
[INFO] [stderr]     Checking incrust v0.2.15 (/opt/rustwide/workdir)
[INFO] [stderr] error[E0554]: `#![feature]` may not be used on the beta release channel
[INFO] [stderr]  --> src/lib.rs:9:1
[INFO] [stderr]   |
[INFO] [stderr] 9 | #![feature(associated_type_defaults)]
[INFO] [stderr]   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] error[E0554]: `#![feature]` may not be used on the beta release channel
[INFO] [stderr]   --> src/lib.rs:10:1
[INFO] [stderr]    |
[INFO] [stderr] 10 | #![feature(box_syntax)]
[INFO] [stderr]    | ^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] error[E0554]: `#![feature]` may not be used on the beta release channel
[INFO] [stderr]   --> src/lib.rs:11:1
[INFO] [stderr]    |
[INFO] [stderr] 11 | #![feature(specialization)]
[INFO] [stderr]    | ^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] error[E0554]: `#![feature]` may not be used on the beta release channel
[INFO] [stderr]  --> src/lib.rs:9:1
[INFO] [stderr]   |
[INFO] [stderr] 9 | #![feature(associated_type_defaults)]
[INFO] [stderr]   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] error[E0554]: `#![feature]` may not be used on the beta release channel
[INFO] [stderr]   --> src/lib.rs:10:1
[INFO] [stderr]    |
[INFO] [stderr] 10 | #![feature(box_syntax)]
[INFO] [stderr]    | ^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] error[E0554]: `#![feature]` may not be used on the beta release channel
[INFO] [stderr]   --> src/lib.rs:11:1
[INFO] [stderr]    |
[INFO] [stderr] 11 | #![feature(specialization)]
[INFO] [stderr]    | ^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] error[E0520]: `is_string` specializes an item from a parent `impl`, but that item is not marked `default`
[INFO] [stderr]   --> src/types/string.rs:24:5
[INFO] [stderr]    |
[INFO] [stderr] 24 | /     fn is_string(&self) -> bool {
[INFO] [stderr] 25 | |         true
[INFO] [stderr] 26 | |     }
[INFO] [stderr]    | |_____^ cannot specialize default item `is_string`
[INFO] [stderr]    | 
[INFO] [stderr]   ::: src/types/defaults.rs:44:1
[INFO] [stderr]    |
[INFO] [stderr] 44 | / impl <'r, T> AsString for T where T: for <'t> Type<'t> + 'r + Display {
[INFO] [stderr] 45 | |     default fn try_as_string(&self) -> Option<Cow<str>> {
[INFO] [stderr] 46 | |         Some(Cow::Owned(ToString::to_string(self)))
[INFO] [stderr] 47 | |     }
[INFO] [stderr] 48 | | }
[INFO] [stderr]    | |_- parent `impl` is here
[INFO] [stderr]    |
[INFO] [stderr]    = note: to specialize, `is_string` in the parent `impl` must be marked `default`
[INFO] [stderr] 
[INFO] [stderr] error[E0520]: `is_string` specializes an item from a parent `impl`, but that item is not marked `default`
[INFO] [stderr]   --> src/types/string.rs:24:5
[INFO] [stderr]    |
[INFO] [stderr] 24 | /     fn is_string(&self) -> bool {
[INFO] [stderr] 25 | |         true
[INFO] [stderr] 26 | |     }
[INFO] [stderr]    | |_____^ cannot specialize default item `is_string`
[INFO] [stderr]    | 
[INFO] [stderr]   ::: src/types/defaults.rs:44:1
[INFO] [stderr]    |
[INFO] [stderr] 44 | / impl <'r, T> AsString for T where T: for <'t> Type<'t> + 'r + Display {
[INFO] [stderr] 45 | |     default fn try_as_string(&self) -> Option<Cow<str>> {
[INFO] [stderr] 46 | |         Some(Cow::Owned(ToString::to_string(self)))
[INFO] [stderr] 47 | |     }
[INFO] [stderr] 48 | | }
[INFO] [stderr]    | |_- parent `impl` is here
[INFO] [stderr]    |
[INFO] [stderr]    = note: to specialize, `is_string` in the parent `impl` must be marked `default`
[INFO] [stderr] 
[INFO] [stderr] error: aborting due to 4 previous errors
[INFO] [stderr] 
[INFO] [stderr] Some errors have detailed explanations: E0520, E0554.
[INFO] [stderr] For more information about an error, try `rustc --explain E0520`.
[INFO] [stderr] error: could not compile `incrust`.
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[INFO] [stderr] error: aborting due to 4 previous errors
[INFO] [stderr] 
[INFO] [stderr] Some errors have detailed explanations: E0520, E0554.
[INFO] [stderr] For more information about an error, try `rustc --explain E0520`.
[INFO] [stderr] error: could not compile `incrust`.
[INFO] [stderr] 
[INFO] [stderr] To learn more, run the command again with --verbose.
[INFO] running `"docker" "inspect" "1567bb8961fbb8861b3d6e9b42d1bca6043d5cc6d7c314feb16904957380eb2c"`
[INFO] running `"docker" "rm" "-f" "1567bb8961fbb8861b3d6e9b42d1bca6043d5cc6d7c314feb16904957380eb2c"`
[INFO] [stdout] 1567bb8961fbb8861b3d6e9b42d1bca6043d5cc6d7c314feb16904957380eb2c