[INFO] updating cached repository https://github.com/lupyuen/test-rust-macros
[INFO] running `"git" "-c" "credential.helper=" "-c" "credential.helper=/big/crater/work/cargo-home/bin/git-credential-null" "-c" "remote.origin.fetch=refs/heads/*:refs/heads/*" "fetch" "origin" "--force" "--prune"`
[INFO] running `"git" "rev-parse" "HEAD"`
[INFO] [stdout] cd22ac775ed634682e11adf89e094e863909c3b5
[INFO] testing lupyuen/test-rust-macros against 1.38.0 for beta-1.39-1
[INFO] running `"git" "clone" "work/cache/git-repos/https%3A%2F%2Fgithub.com%2Flupyuen%2Ftest-rust-macros" "work/builds/worker-6/source"`
[INFO] [stderr] Cloning into 'work/builds/worker-6/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/lupyuen/test-rust-macros 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 git repo https://github.com/lupyuen/test-rust-macros
[INFO] finished tweaking git repo https://github.com/lupyuen/test-rust-macros
[INFO] tweaked toml for git repo https://github.com/lupyuen/test-rust-macros written to work/builds/worker-6/source/Cargo.toml
[INFO] crate git repo https://github.com/lupyuen/test-rust-macros 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-6/target:/opt/rustwide/target:rw,Z" "-v" "/big/crater/work/builds/worker-6/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] b53fa1ae0de0364178c2400446cd19a03386853b1842433999e8ba8d9e5c7ff9
[INFO] running `"docker" "start" "-a" "b53fa1ae0de0364178c2400446cd19a03386853b1842433999e8ba8d9e5c7ff9"`
[INFO] [stderr]    Compiling test-rust-macros v0.1.0 (/opt/rustwide/workdir)
[INFO] [stderr] note: trace_macro
[INFO] [stderr]    --> src/main.rs:173:15
[INFO] [stderr]     |
[INFO] [stderr] 173 |     let res = add_88!(1);
[INFO] [stderr]     |               ^^^^^^^^^^
[INFO] [stderr]     |
[INFO] [stderr]     = note: expanding `add_88! { 1 }`
[INFO] [stderr]     = note: to `{ 1 + 88 }`
[INFO] [stderr] 
[INFO] [stderr] error[E0425]: cannot find value `salt` in this scope
[INFO] [stderr]   --> src/main.rs:93:14
[INFO] [stderr]    |
[INFO] [stderr] 93 |         88 + salt  // If you're testing other macros, comment out the `+ salt` part or the code will never compile
[INFO] [stderr]    |              ^^^^ not found in this scope
[INFO] [stderr] 
[INFO] [stderr] error[E0554]: `#![feature]` may not be used on the stable release channel
[INFO] [stderr]  --> src/main.rs:1:1
[INFO] [stderr]   |
[INFO] [stderr] 1 | #![feature(trace_macros)]        //  Enable tracing of macros
[INFO] [stderr]   | ^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] error[E0554]: `#![feature]` may not be used on the stable release channel
[INFO] [stderr]  --> src/main.rs:2:1
[INFO] [stderr]   |
[INFO] [stderr] 2 | #![feature(proc_macro_hygiene)]  //  Allow proc macros to be unhygienic
[INFO] [stderr]   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] error[E0554]: `#![feature]` may not be used on the stable release channel
[INFO] [stderr]  --> src/main.rs:3:1
[INFO] [stderr]   |
[INFO] [stderr] 3 | #![feature(custom_attribute)]    //  Allow custom attributes like [safe_wrap]
[INFO] [stderr]   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] error: aborting due to 4 previous errors
[INFO] [stderr] 
[INFO] [stderr] Some errors have detailed explanations: E0425, E0554.
[INFO] [stderr] For more information about an error, try `rustc --explain E0425`.
[INFO] [stderr] error: Could not compile `test-rust-macros`.
[INFO] [stderr] 
[INFO] [stderr] To learn more, run the command again with --verbose.
[INFO] running `"docker" "inspect" "b53fa1ae0de0364178c2400446cd19a03386853b1842433999e8ba8d9e5c7ff9"`
[INFO] running `"docker" "rm" "-f" "b53fa1ae0de0364178c2400446cd19a03386853b1842433999e8ba8d9e5c7ff9"`
[INFO] [stdout] b53fa1ae0de0364178c2400446cd19a03386853b1842433999e8ba8d9e5c7ff9