[INFO] updating cached repository milesand/calculator-the-solver [INFO] running `"git" "fetch" "--all"` [INFO] [stdout] Fetching origin [INFO] [stderr] From git://github.com/milesand/calculator-the-solver [INFO] [stderr] * branch HEAD -> FETCH_HEAD [INFO] running `"git" "clone" "work/cache/sources/gh/milesand/calculator-the-solver" "work/ex/beta-1.38-1/sources/1.37.0/gh/milesand/calculator-the-solver"` [INFO] [stderr] Cloning into 'work/ex/beta-1.38-1/sources/1.37.0/gh/milesand/calculator-the-solver'... [INFO] [stderr] done. [INFO] running `"git" "clone" "work/cache/sources/gh/milesand/calculator-the-solver" "work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/milesand/calculator-the-solver"` [INFO] [stderr] Cloning into 'work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/milesand/calculator-the-solver'... [INFO] [stderr] done. [INFO] running `"git" "rev-parse" "HEAD"` [INFO] [stdout] aa074792688f3ccc44a51a3e5b7af26239e9751d [INFO] sha for GitHub repo milesand/calculator-the-solver: aa074792688f3ccc44a51a3e5b7af26239e9751d [INFO] validating manifest of milesand/calculator-the-solver on toolchain 1.37.0 [INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+1.37.0" "read-manifest" "--manifest-path" "Cargo.toml"` [INFO] validating manifest of milesand/calculator-the-solver on toolchain beta-2019-08-13 [INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+beta-2019-08-13" "read-manifest" "--manifest-path" "Cargo.toml"` [INFO] started frobbing milesand/calculator-the-solver [INFO] finished frobbing milesand/calculator-the-solver [INFO] frobbed toml for milesand/calculator-the-solver written to work/ex/beta-1.38-1/sources/1.37.0/gh/milesand/calculator-the-solver/Cargo.toml [INFO] started frobbing milesand/calculator-the-solver [INFO] finished frobbing milesand/calculator-the-solver [INFO] frobbed toml for milesand/calculator-the-solver written to work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/milesand/calculator-the-solver/Cargo.toml [INFO] crate milesand/calculator-the-solver already has a lockfile, it will not be regenerated [INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+1.37.0" "fetch" "--locked" "--manifest-path" "Cargo.toml"` [INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+beta-2019-08-13" "fetch" "--locked" "--manifest-path" "Cargo.toml"` [INFO] testing milesand/calculator-the-solver against 1.37.0 for beta-1.38-1 [INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/beta-1.38-1/worker-0/1.37.0:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/beta-1.38-1/sources/1.37.0/gh/milesand/calculator-the-solver:/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" "+1.37.0" "build" "--frozen"` [INFO] [stdout] b48914d2db7002db717bf6238bd406333d9f821e231285cbab007204d0f1cefb [INFO] running `"docker" "start" "-a" "b48914d2db7002db717bf6238bd406333d9f821e231285cbab007204d0f1cefb"` [INFO] [stderr] Compiling rand v0.4.2 [INFO] [stderr] Compiling rand v0.3.22 [INFO] [stderr] Compiling num-bigint v0.1.41 [INFO] [stderr] Compiling num-rational v0.1.41 [INFO] [stderr] Compiling num v0.1.41 [INFO] [stderr] Compiling calculator-the-solver v0.0.1 (/opt/crater/workdir) [INFO] [stderr] error[E0554]: #![feature] may not be used on the stable release channel [INFO] [stderr] --> src/lib.rs:1:1 [INFO] [stderr] | [INFO] [stderr] 1 | #![feature(option_filter)] [INFO] [stderr] | ^^^^^^^^^^^^^^^^^^^^^^^^^^ [INFO] [stderr] [INFO] [stderr] error[E0554]: #![feature] may not be used on the stable release channel [INFO] [stderr] --> src/lib.rs:2:1 [INFO] [stderr] | [INFO] [stderr] 2 | #![feature(try_from)] [INFO] [stderr] | ^^^^^^^^^^^^^^^^^^^^^ [INFO] [stderr] [INFO] [stderr] warning: the item `OpKind` is imported redundantly [INFO] [stderr] --> src/op.rs:102:13 [INFO] [stderr] | [INFO] [stderr] 17 | / enum OpKind { [INFO] [stderr] 18 | | Add(i32), [INFO] [stderr] 19 | | Mul(i32), [INFO] [stderr] 20 | | Div(i32), [INFO] [stderr] ... | [INFO] [stderr] 27 | | Rpc { from_digits: u8, from_n: u32, to_digits: u8, to_n: u32 }, [INFO] [stderr] 28 | | } [INFO] [stderr] | |_- the item `OpKind` is already defined here [INFO] [stderr] ... [INFO] [stderr] 102 | use self::OpKind; [INFO] [stderr] | ^^^^^^^^^^^^ [INFO] [stderr] | [INFO] [stderr] = note: #[warn(unused_imports)] on by default [INFO] [stderr] [INFO] [stderr] warning: the item `Op` is imported redundantly [INFO] [stderr] --> src/op.rs:195:13 [INFO] [stderr] | [INFO] [stderr] 12 | / pub struct Op { [INFO] [stderr] 13 | | inner: OpKind, [INFO] [stderr] 14 | | } [INFO] [stderr] | |_- the item `Op` is already defined here [INFO] [stderr] ... [INFO] [stderr] 195 | use self::Op; [INFO] [stderr] | ^^^^^^^^ [INFO] [stderr] [INFO] [stderr] warning: the item `OpKind` is imported redundantly [INFO] [stderr] --> src/op.rs:247:13 [INFO] [stderr] | [INFO] [stderr] 17 | / enum OpKind { [INFO] [stderr] 18 | | Add(i32), [INFO] [stderr] 19 | | Mul(i32), [INFO] [stderr] 20 | | Div(i32), [INFO] [stderr] ... | [INFO] [stderr] 27 | | Rpc { from_digits: u8, from_n: u32, to_digits: u8, to_n: u32 }, [INFO] [stderr] 28 | | } [INFO] [stderr] | |_- the item `OpKind` is already defined here [INFO] [stderr] ... [INFO] [stderr] 247 | use self::OpKind; [INFO] [stderr] | ^^^^^^^^^^^^ [INFO] [stderr] [INFO] [stderr] error: aborting due to 2 previous errors [INFO] [stderr] [INFO] [stderr] For more information about this error, try `rustc --explain E0554`. [INFO] [stderr] error: Could not compile `calculator-the-solver`. [INFO] [stderr] [INFO] [stderr] To learn more, run the command again with --verbose. [INFO] running `"docker" "inspect" "b48914d2db7002db717bf6238bd406333d9f821e231285cbab007204d0f1cefb"` [INFO] running `"docker" "rm" "-f" "b48914d2db7002db717bf6238bd406333d9f821e231285cbab007204d0f1cefb"` [INFO] [stdout] b48914d2db7002db717bf6238bd406333d9f821e231285cbab007204d0f1cefb