[INFO] crate hashcons 0.1.1 is already in cache
[INFO] extracting crate hashcons 0.1.1 into work/ex/pr-58948/sources/master#0f88167f89fffe321590c5148f21b7d51d44388d/reg/hashcons/0.1.1
[INFO] extracting crate hashcons 0.1.1 into work/ex/pr-58948/sources/try#a829e31f924ec11e400e8d0c2fd2c4bb8937ae6b/reg/hashcons/0.1.1
[INFO] validating manifest of hashcons-0.1.1 on toolchain master#0f88167f89fffe321590c5148f21b7d51d44388d
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+0f88167f89fffe321590c5148f21b7d51d44388d-alt" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] validating manifest of hashcons-0.1.1 on toolchain try#a829e31f924ec11e400e8d0c2fd2c4bb8937ae6b
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+a829e31f924ec11e400e8d0c2fd2c4bb8937ae6b-alt" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] started frobbing hashcons-0.1.1
[INFO] finished frobbing hashcons-0.1.1
[INFO] frobbed toml for hashcons-0.1.1 written to work/ex/pr-58948/sources/master#0f88167f89fffe321590c5148f21b7d51d44388d/reg/hashcons/0.1.1/Cargo.toml
[INFO] started frobbing hashcons-0.1.1
[INFO] finished frobbing hashcons-0.1.1
[INFO] frobbed toml for hashcons-0.1.1 written to work/ex/pr-58948/sources/try#a829e31f924ec11e400e8d0c2fd2c4bb8937ae6b/reg/hashcons/0.1.1/Cargo.toml
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+0f88167f89fffe321590c5148f21b7d51d44388d-alt" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update"`
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+a829e31f924ec11e400e8d0c2fd2c4bb8937ae6b-alt" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update"`
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+0f88167f89fffe321590c5148f21b7d51d44388d-alt" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+a829e31f924ec11e400e8d0c2fd2c4bb8937ae6b-alt" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] checking hashcons-0.1.1 against try#a829e31f924ec11e400e8d0c2fd2c4bb8937ae6b for pr-58948
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/pr-58948/worker-6/try#a829e31f924ec11e400e8d0c2fd2c4bb8937ae6b:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/pr-58948/sources/try#a829e31f924ec11e400e8d0c2fd2c4bb8937ae6b/reg/hashcons/0.1.1:/opt/crater/workdir:ro,Z" "-v" "/mnt/big/crater/work/local/cargo-home:/opt/crater/cargo-home:ro,Z" "-v" "/mnt/big/crater/work/local/rustup-home:/opt/crater/rustup-home:ro,Z" "-e" "USER_ID=1000" "-e" "SOURCE_DIR=/opt/crater/workdir" "-e" "MAP_USER_ID=1000" "-e" "CARGO_TARGET_DIR=/opt/crater/target" "-e" "CARGO_INCREMENTAL=0" "-e" "RUST_BACKTRACE=full" "-e" "RUSTFLAGS=--cap-lints=forbid" "-e" "CARGO_HOME=/opt/crater/cargo-home" "-e" "RUSTUP_HOME=/opt/crater/rustup-home" "-w" "/opt/crater/workdir" "-m" "1536M" "--network" "none" "rustops/crates-build-env" "/opt/crater/cargo-home/bin/cargo" "+a829e31f924ec11e400e8d0c2fd2c4bb8937ae6b-alt" "check" "--frozen" "--all" "--all-targets"`
[INFO] [stdout] d47b731f5dec00a31952f3fe4d1fbb2b5b403e644e24ef2c8a5ec841b21bf393
[INFO] running `"docker" "start" "-a" "d47b731f5dec00a31952f3fe4d1fbb2b5b403e644e24ef2c8a5ec841b21bf393"`
[INFO] [stderr]     Checking hashcons v0.1.1 (/opt/crater/workdir)
[INFO] [stderr] warning: unused doc comment
[INFO] [stderr]    --> src/merkle.rs:180:1
[INFO] [stderr]     |
[INFO] [stderr] 180 | / /// Global table of serialized objects; permits us to avoid multiple
[INFO] [stderr] 181 | | /// serialized copies of a single, shared object.
[INFO] [stderr]     | |_________________________________________________^
[INFO] [stderr] 182 | / thread_local!(static TABLE:
[INFO] [stderr] 183 | |               RefCell<Table> =
[INFO] [stderr] 184 | |               RefCell::new(Table{
[INFO] [stderr] 185 | |                   copy_count:0,
[INFO] [stderr] 186 | |                   table:HashMap::new()
[INFO] [stderr] 187 | |               }));
[INFO] [stderr]     | |__________________- rustdoc does not generate documentation for macro expansions
[INFO] [stderr]     |
[INFO] [stderr]     = note: #[warn(unused_doc_comments)] on by default
[INFO] [stderr]     = help: to document an item produced by a macro, the macro must produce the documentation as part of its expansion
[INFO] [stderr] 
[INFO] [stderr] warning: unused doc comment
[INFO] [stderr]    --> src/merkle.rs:180:1
[INFO] [stderr]     |
[INFO] [stderr] 180 | / /// Global table of serialized objects; permits us to avoid multiple
[INFO] [stderr] 181 | | /// serialized copies of a single, shared object.
[INFO] [stderr]     | |_________________________________________________^
[INFO] [stderr] 182 | / thread_local!(static TABLE:
[INFO] [stderr] 183 | |               RefCell<Table> =
[INFO] [stderr] 184 | |               RefCell::new(Table{
[INFO] [stderr] 185 | |                   copy_count:0,
[INFO] [stderr] 186 | |                   table:HashMap::new()
[INFO] [stderr] 187 | |               }));
[INFO] [stderr]     | |__________________- rustdoc does not generate documentation for macro expansions
[INFO] [stderr]     |
[INFO] [stderr]     = note: #[warn(unused_doc_comments)] on by default
[INFO] [stderr]     = help: to document an item produced by a macro, the macro must produce the documentation as part of its expansion
[INFO] [stderr] 
[INFO] [stderr] warning: the feature `rc_downcast` has been stable since 1.29.0 and no longer requires an attribute to enable
[INFO] [stderr]  --> src/lib.rs:1:12
[INFO] [stderr]   |
[INFO] [stderr] 1 | #![feature(rc_downcast)]
[INFO] [stderr]   |            ^^^^^^^^^^^
[INFO] [stderr]   |
[INFO] [stderr]   = note: #[warn(stable_features)] on by default
[INFO] [stderr] 
[INFO] [stderr] warning: the feature `rc_downcast` has been stable since 1.29.0 and no longer requires an attribute to enable
[INFO] [stderr]  --> src/lib.rs:1:12
[INFO] [stderr]   |
[INFO] [stderr] 1 | #![feature(rc_downcast)]
[INFO] [stderr]   |            ^^^^^^^^^^^
[INFO] [stderr]   |
[INFO] [stderr]   = note: #[warn(stable_features)] on by default
[INFO] [stderr] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 0.82s
[INFO] running `"docker" "inspect" "d47b731f5dec00a31952f3fe4d1fbb2b5b403e644e24ef2c8a5ec841b21bf393"`
[INFO] running `"docker" "rm" "-f" "d47b731f5dec00a31952f3fe4d1fbb2b5b403e644e24ef2c8a5ec841b21bf393"`
[INFO] [stdout] d47b731f5dec00a31952f3fe4d1fbb2b5b403e644e24ef2c8a5ec841b21bf393