Dec 06 20:49:26.051 INFO testing tangle-0.4.0 against master#906deae0790bd18681b937fe9a141a3c26cf1855 for pr-56514
Dec 06 20:49:26.052 INFO running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/pr-56514/worker-5/master#906deae0790bd18681b937fe9a141a3c26cf1855:/target:rw,Z" "-v" "/mnt/big/crater/work/local/test-source/worker-5/pr-56514/master#906deae0790bd18681b937fe9a141a3c26cf1855:/source:ro,Z" "-v" "/mnt/big/crater/work/local/cargo-home:/cargo-home:ro,Z" "-v" "/mnt/big/crater/work/local/rustup-home:/rustup-home:ro,Z" "-e" "USER_ID=1000" "-e" "SOURCE_DIR=/source" "-e" "USER_ID=1000" "-e" "CMD=cargo +906deae0790bd18681b937fe9a141a3c26cf1855-alt build --frozen" "-e" "CARGO_TARGET_DIR=/target" "-e" "CARGO_INCREMENTAL=0" "-e" "RUST_BACKTRACE=full" "-e" "RUSTFLAGS=--cap-lints=forbid" "-e" "CARGO_HOME=/cargo-home" "-e" "RUSTUP_HOME=/rustup-home" "-m" "1536M" "--network" "none" "crater"`
Dec 06 20:49:26.670 INFO [stdout] e541f8c3bac6ab4671193750703d907dc7c8a2dc01d3db1e60ad6363234bbfbe
Dec 06 20:49:26.672 INFO running `"docker" "start" "-a" "e541f8c3bac6ab4671193750703d907dc7c8a2dc01d3db1e60ad6363234bbfbe"`
Dec 06 20:49:28.055 INFO [stderr] usermod: no changes
Dec 06 20:49:28.133 INFO [stderr]    Compiling tangle v0.4.0 (/source)
Dec 06 20:49:28.724 INFO [stderr] warning: unused import: `std::thread`
Dec 06 20:49:28.724 INFO [stderr]  --> src/lib.rs:7:5
Dec 06 20:49:28.725 INFO [stderr]   |
Dec 06 20:49:28.725 INFO [stderr] 7 | use std::thread;
Dec 06 20:49:28.725 INFO [stderr]   |     ^^^^^^^^^^^
Dec 06 20:49:28.727 INFO [stderr]   |
Dec 06 20:49:28.727 INFO [stderr]   = note: #[warn(unused_imports)] on by default
Dec 06 20:49:28.727 INFO [stderr] 
Dec 06 20:49:28.727 INFO [stderr] warning: unused import: `std::convert`
Dec 06 20:49:28.727 INFO [stderr]   --> src/lib.rs:10:5
Dec 06 20:49:28.727 INFO [stderr]    |
Dec 06 20:49:28.727 INFO [stderr] 10 | use std::convert;
Dec 06 20:49:28.727 INFO [stderr]    |     ^^^^^^^^^^^^
Dec 06 20:49:28.727 INFO [stderr] 
Dec 06 20:49:28.728 INFO [stderr] error: defaults for type parameters are only allowed in `struct`, `enum`, `type`, or `trait` definitions.
Dec 06 20:49:28.728 INFO [stderr]    --> src/lib.rs:178:9
Dec 06 20:49:28.728 INFO [stderr]     |
Dec 06 20:49:28.728 INFO [stderr] 178 | impl<T, E=()> Future<T, E>
Dec 06 20:49:28.728 INFO [stderr]     |         ^
Dec 06 20:49:28.728 INFO [stderr]     |
Dec 06 20:49:28.728 INFO [stderr]     = note: #[deny(invalid_type_param_default)] on by default
Dec 06 20:49:28.728 INFO [stderr]     = warning: this was previously accepted by the compiler but is being phased out; it will become a hard error in a future release!
Dec 06 20:49:28.728 INFO [stderr]     = note: for more information, see issue #36887 <https://github.com/rust-lang/rust/issues/36887>
Dec 06 20:49:28.728 INFO [stderr] 
Dec 06 20:49:28.728 INFO [stderr] error: aborting due to previous error
Dec 06 20:49:28.728 INFO [stderr] 
Dec 06 20:49:28.730 INFO [stderr] error: Could not compile `tangle`.
Dec 06 20:49:28.730 INFO [stderr] 
Dec 06 20:49:28.730 INFO [stderr] To learn more, run the command again with --verbose.
Dec 06 20:49:28.730 INFO [stderr] su: No module specific data is present
Dec 06 20:49:29.296 INFO running `"docker" "inspect" "e541f8c3bac6ab4671193750703d907dc7c8a2dc01d3db1e60ad6363234bbfbe"`
Dec 06 20:49:29.510 INFO running `"docker" "rm" "-f" "e541f8c3bac6ab4671193750703d907dc7c8a2dc01d3db1e60ad6363234bbfbe"`
Dec 06 20:49:29.782 INFO [stdout] e541f8c3bac6ab4671193750703d907dc7c8a2dc01d3db1e60ad6363234bbfbe