[INFO] crate canonical_json 0.8.4 is already in cache
[INFO] extracting crate canonical_json 0.8.4 into work/ex/beta-1.37-6/sources/1.36.0/reg/canonical_json/0.8.4
[INFO] extracting crate canonical_json 0.8.4 into work/ex/beta-1.37-6/sources/beta-2019-07-23/reg/canonical_json/0.8.4
[INFO] validating manifest of canonical_json-0.8.4 on toolchain 1.36.0
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+1.36.0" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] validating manifest of canonical_json-0.8.4 on toolchain beta-2019-07-23
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+beta-2019-07-23" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] started frobbing canonical_json-0.8.4
[INFO] finished frobbing canonical_json-0.8.4
[INFO] frobbed toml for canonical_json-0.8.4 written to work/ex/beta-1.37-6/sources/1.36.0/reg/canonical_json/0.8.4/Cargo.toml
[INFO] started frobbing canonical_json-0.8.4
[INFO] finished frobbing canonical_json-0.8.4
[INFO] frobbed toml for canonical_json-0.8.4 written to work/ex/beta-1.37-6/sources/beta-2019-07-23/reg/canonical_json/0.8.4/Cargo.toml
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+1.36.0" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update"`
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+beta-2019-07-23" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update"`
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+1.36.0" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+beta-2019-07-23" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] testing canonical_json-0.8.4 against 1.36.0 for beta-1.37-6
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/beta-1.37-6/worker-1/1.36.0:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/beta-1.37-6/sources/1.36.0/reg/canonical_json/0.8.4:/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=warn" "-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" "+1.36.0" "build" "--frozen"`
[INFO] [stdout] 34241433ec6098304f5bf80f80a584e8e103cbe388245491b6ff1bdeeb976722
[INFO] running `"docker" "start" "-a" "34241433ec6098304f5bf80f80a584e8e103cbe388245491b6ff1bdeeb976722"`
[INFO] [stderr]    Compiling dtoa v0.2.2
[INFO] [stderr]    Compiling itoa v0.1.1
[INFO] [stderr]    Compiling serde_json v0.8.6
[INFO] [stderr]    Compiling canonical_json v0.8.4 (/opt/crater/workdir)
[INFO] [stderr] error[E0437]: type `Err` is not a member of trait `TryFrom`
[INFO] [stderr]     --> src/value.rs:1146:5
[INFO] [stderr]      |
[INFO] [stderr] 1146 |     type Err = SyntaxError;
[INFO] [stderr]      |     ^^^^^^^^^^^^^^^^^^^^^^^ not a member of trait `TryFrom`
[INFO] [stderr] 
[INFO] [stderr] error[E0554]: #![feature] may not be used on the stable release channel
[INFO] [stderr]    --> src/lib.rs:200:1
[INFO] [stderr]     |
[INFO] [stderr] 200 | #![feature(try_from)]
[INFO] [stderr]     | ^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] error[E0046]: not all trait items implemented, missing: `Error`
[INFO] [stderr]     --> src/value.rs:1145:1
[INFO] [stderr]      |
[INFO] [stderr] 1145 | impl TryFrom<serde_json::Value> for Value {
[INFO] [stderr]      | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ missing `Error` in implementation
[INFO] [stderr]      |
[INFO] [stderr]      = note: `Error` from trait: `type Error;`
[INFO] [stderr] 
[INFO] [stderr] error: aborting due to 3 previous errors
[INFO] [stderr] 
[INFO] [stderr] Some errors have detailed explanations: E0046, E0437, E0554.
[INFO] [stderr] For more information about an error, try `rustc --explain E0046`.
[INFO] [stderr] error: Could not compile `canonical_json`.
[INFO] [stderr] 
[INFO] [stderr] To learn more, run the command again with --verbose.
[INFO] running `"docker" "inspect" "34241433ec6098304f5bf80f80a584e8e103cbe388245491b6ff1bdeeb976722"`
[INFO] running `"docker" "rm" "-f" "34241433ec6098304f5bf80f80a584e8e103cbe388245491b6ff1bdeeb976722"`
[INFO] [stdout] 34241433ec6098304f5bf80f80a584e8e103cbe388245491b6ff1bdeeb976722