[INFO] crate cgc 0.2.6 is already in cache
[INFO] testing cgc-0.2.6 against 1.38.0 for beta-1.39-1
[INFO] extracting crate cgc 0.2.6 into work/builds/worker-0/source
[INFO] validating manifest of crates.io crate cgc 0.2.6 on toolchain 1.38.0
[INFO] running `"/big/crater/work/cargo-home/bin/cargo" "+1.38.0" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] started tweaking crates.io crate cgc 0.2.6
[INFO] finished tweaking crates.io crate cgc 0.2.6
[INFO] tweaked toml for crates.io crate cgc 0.2.6 written to work/builds/worker-0/source/Cargo.toml
[INFO] crate crates.io crate cgc 0.2.6 already has a lockfile, it will not be regenerated
[INFO] running `"/big/crater/work/cargo-home/bin/cargo" "+1.38.0" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] running `"docker" "create" "-v" "/big/crater/work/builds/worker-0/target:/opt/rustwide/target:rw,Z" "-v" "/big/crater/work/builds/worker-0/source:/opt/rustwide/workdir:ro,Z" "-v" "/big/crater/work/cargo-home:/opt/rustwide/cargo-home:ro,Z" "-v" "/big/crater/work/rustup-home:/opt/rustwide/rustup-home:ro,Z" "-e" "SOURCE_DIR=/opt/rustwide/workdir" "-e" "MAP_USER_ID=1000" "-e" "CARGO_TARGET_DIR=/opt/rustwide/target" "-e" "CARGO_INCREMENTAL=0" "-e" "RUST_BACKTRACE=full" "-e" "RUSTFLAGS=--cap-lints=warn" "-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" "+1.38.0" "build" "--frozen"`
[INFO] [stdout] 46b8e4a66720881caabed8848e79191569bf3e783b40e0d90c719a4aff35e407
[INFO] running `"docker" "start" "-a" "46b8e4a66720881caabed8848e79191569bf3e783b40e0d90c719a4aff35e407"`
[INFO] [stderr]    Compiling cgc v0.2.6 (/opt/rustwide/workdir)
[INFO] [stderr] error[E0433]: failed to resolve: use of undeclared type or module `mem`
[INFO] [stderr]    --> src/internal.rs:380:19
[INFO] [stderr]     |
[INFO] [stderr] 380 |     debug_assert!(mem::is_page_aligned(ptr as usize));
[INFO] [stderr]     |                   ^^^ use of undeclared type or module `mem`
[INFO] [stderr] 
[INFO] [stderr] error[E0433]: failed to resolve: use of undeclared type or module `mem`
[INFO] [stderr]    --> src/internal.rs:381:19
[INFO] [stderr]     |
[INFO] [stderr] 381 |     debug_assert!(mem::is_page_aligned(size));
[INFO] [stderr]     |                   ^^^ use of undeclared type or module `mem`
[INFO] [stderr] 
[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(coerce_unsized)]
[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(unsize)]
[INFO] [stderr]   | ^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `self::ProtType::*`
[INFO] [stderr]    --> src/internal.rs:212:16
[INFO] [stderr]     |
[INFO] [stderr] 212 | pub(crate) use self::ProtType::*;
[INFO] [stderr]     |                ^^^^^^^^^^^^^^^^^
[INFO] [stderr]     |
[INFO] [stderr]     = note: `#[warn(unused_imports)]` on by default
[INFO] [stderr] 
[INFO] [stderr] error: aborting due to 4 previous errors
[INFO] [stderr] 
[INFO] [stderr] Some errors have detailed explanations: E0433, E0554.
[INFO] [stderr] For more information about an error, try `rustc --explain E0433`.
[INFO] [stderr] error: Could not compile `cgc`.
[INFO] [stderr] 
[INFO] [stderr] To learn more, run the command again with --verbose.
[INFO] running `"docker" "inspect" "46b8e4a66720881caabed8848e79191569bf3e783b40e0d90c719a4aff35e407"`
[INFO] running `"docker" "rm" "-f" "46b8e4a66720881caabed8848e79191569bf3e783b40e0d90c719a4aff35e407"`
[INFO] [stdout] 46b8e4a66720881caabed8848e79191569bf3e783b40e0d90c719a4aff35e407