[INFO] crate thin_cstr 0.1.0 is already in cache
[INFO] testing thin_cstr-0.1.0 against 1.38.0 for beta-1.39-1
[INFO] extracting crate thin_cstr 0.1.0 into work/builds/worker-3/source
[INFO] validating manifest of crates.io crate thin_cstr 0.1.0 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 thin_cstr 0.1.0
[INFO] finished tweaking crates.io crate thin_cstr 0.1.0
[INFO] tweaked toml for crates.io crate thin_cstr 0.1.0 written to work/builds/worker-3/source/Cargo.toml
[INFO] running `"/big/crater/work/cargo-home/bin/cargo" "+1.38.0" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update"`
[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-3/target:/opt/rustwide/target:rw,Z" "-v" "/big/crater/work/builds/worker-3/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] 3e92add50df7b2ecf6af864269159834ff7b8b25c78eadb31c0eab282fd4cab8
[INFO] running `"docker" "start" "-a" "3e92add50df7b2ecf6af864269159834ff7b8b25c78eadb31c0eab282fd4cab8"`
[INFO] [stderr]    Compiling thin_cstr v0.1.0 (/opt/rustwide/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(extern_types)]
[INFO] [stderr]   | ^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stderr]    --> src/c_str.rs:785:32
[INFO] [stderr]     |
[INFO] [stderr] 785 |     fn cause(&self) -> Option<&Error> {
[INFO] [stderr]     |                                ^^^^^ help: use `dyn`: `dyn Error`
[INFO] [stderr]     |
[INFO] [stderr]     = note: `#[warn(bare_trait_objects)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: type annotations needed
[INFO] [stderr]    --> src/c_str.rs:832:27
[INFO] [stderr]     |
[INFO] [stderr] 832 |         (ptr as *const _).as_ref().expect("cannot convert a null pointer to a CStr")
[INFO] [stderr]     |                           ^^^^^^
[INFO] [stderr]     |
[INFO] [stderr]     = note: `#[warn(tyvar_behind_raw_pointer)]` on by default
[INFO] [stderr]     = warning: this was previously accepted by the compiler but is being phased out; it will become a hard error in the 2018 edition!
[INFO] [stderr]     = note: for more information, see issue #46906 <https://github.com/rust-lang/rust/issues/46906>
[INFO] [stderr] 
[INFO] [stderr] error: aborting due to previous error
[INFO] [stderr] 
[INFO] [stderr] For more information about this error, try `rustc --explain E0554`.
[INFO] [stderr] error: Could not compile `thin_cstr`.
[INFO] [stderr] 
[INFO] [stderr] To learn more, run the command again with --verbose.
[INFO] running `"docker" "inspect" "3e92add50df7b2ecf6af864269159834ff7b8b25c78eadb31c0eab282fd4cab8"`
[INFO] running `"docker" "rm" "-f" "3e92add50df7b2ecf6af864269159834ff7b8b25c78eadb31c0eab282fd4cab8"`
[INFO] [stdout] 3e92add50df7b2ecf6af864269159834ff7b8b25c78eadb31c0eab282fd4cab8