Dec 12 16:28:17.409 INFO checking comacro-0.0.1 against master#3a75e80557a103497cffbcab395a2f37061a77ea for pr-56677
Dec 12 16:28:17.409 INFO running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/pr-56677/worker-0/master#3a75e80557a103497cffbcab395a2f37061a77ea:/target:rw,Z" "-v" "/mnt/big/crater/work/local/test-source/worker-0/pr-56677/master#3a75e80557a103497cffbcab395a2f37061a77ea:/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 +3a75e80557a103497cffbcab395a2f37061a77ea-alt check --frozen --all --all-targets" "-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 12 16:28:17.869 INFO [stdout] a847b55c98215b5a175d1a4fab33adeca1c8759b7e11307ac70c6c1a8635b868
Dec 12 16:28:17.871 INFO running `"docker" "start" "-a" "a847b55c98215b5a175d1a4fab33adeca1c8759b7e11307ac70c6c1a8635b868"`
Dec 12 16:28:19.248 INFO [stderr] usermod: no changes
Dec 12 16:28:19.408 INFO [stderr]     Checking log v0.4.6
Dec 12 16:28:19.436 INFO [stderr]     Checking syn v0.15.22
Dec 12 16:28:21.300 INFO [stderr]     Checking env_logger v0.5.13
Dec 12 16:28:25.873 INFO [stderr]     Checking comacro v0.0.1 (/source)
Dec 12 16:28:27.741 INFO [stderr] warning: unnecessary parentheses around pattern
Dec 12 16:28:27.741 INFO [stderr]   --> src/trace.rs:84:21
Dec 12 16:28:27.741 INFO [stderr]    |
Dec 12 16:28:27.742 INFO [stderr] 84 |                 let ((&x, rest)) = rest.split_first().unwrap();
Dec 12 16:28:27.742 INFO [stderr]    |                     ^^^^^^^^^^^^ help: remove these parentheses
Dec 12 16:28:27.742 INFO [stderr]    |
Dec 12 16:28:27.742 INFO [stderr]    = note: #[warn(unused_parens)] on by default
Dec 12 16:28:27.743 INFO [stderr] 
Dec 12 16:28:28.044 INFO [stderr] warning: unnecessary parentheses around pattern
Dec 12 16:28:28.045 INFO [stderr]   --> src/trace.rs:84:21
Dec 12 16:28:28.045 INFO [stderr]    |
Dec 12 16:28:28.045 INFO [stderr] 84 |                 let ((&x, rest)) = rest.split_first().unwrap();
Dec 12 16:28:28.045 INFO [stderr]    |                     ^^^^^^^^^^^^ help: remove these parentheses
Dec 12 16:28:28.045 INFO [stderr]    |
Dec 12 16:28:28.045 INFO [stderr]    = note: #[warn(unused_parens)] on by default
Dec 12 16:28:28.045 INFO [stderr] 
Dec 12 16:28:28.327 INFO [stderr] warning: unused variable: `x`
Dec 12 16:28:28.327 INFO [stderr]    --> src/repr.rs:270:29
Dec 12 16:28:28.327 INFO [stderr]     |
Dec 12 16:28:28.327 INFO [stderr] 270 |     fn push_byte(&mut self, x: u8) {}
Dec 12 16:28:28.327 INFO [stderr]     |                             ^ help: consider using `_x` instead
Dec 12 16:28:28.327 INFO [stderr]     |
Dec 12 16:28:28.328 INFO [stderr]     = note: #[warn(unused_variables)] on by default
Dec 12 16:28:28.328 INFO [stderr] 
Dec 12 16:28:28.328 INFO [stderr] warning: unused variable: `x`
Dec 12 16:28:28.328 INFO [stderr]    --> src/repr.rs:271:32
Dec 12 16:28:28.328 INFO [stderr]     |
Dec 12 16:28:28.328 INFO [stderr] 271 |     fn extend_bytes(&mut self, x: &[u8]) {}
Dec 12 16:28:28.328 INFO [stderr]     |                                ^ help: consider using `_x` instead
Dec 12 16:28:28.328 INFO [stderr] 
Dec 12 16:28:28.568 INFO [stderr] warning: unused variable: `x`
Dec 12 16:28:28.568 INFO [stderr]    --> src/repr.rs:270:29
Dec 12 16:28:28.568 INFO [stderr]     |
Dec 12 16:28:28.568 INFO [stderr] 270 |     fn push_byte(&mut self, x: u8) {}
Dec 12 16:28:28.568 INFO [stderr]     |                             ^ help: consider using `_x` instead
Dec 12 16:28:28.568 INFO [stderr]     |
Dec 12 16:28:28.568 INFO [stderr]     = note: #[warn(unused_variables)] on by default
Dec 12 16:28:28.568 INFO [stderr] 
Dec 12 16:28:28.568 INFO [stderr] warning: unused variable: `x`
Dec 12 16:28:28.568 INFO [stderr]    --> src/repr.rs:271:32
Dec 12 16:28:28.569 INFO [stderr]     |
Dec 12 16:28:28.569 INFO [stderr] 271 |     fn extend_bytes(&mut self, x: &[u8]) {}
Dec 12 16:28:28.569 INFO [stderr]     |                                ^ help: consider using `_x` instead
Dec 12 16:28:28.569 INFO [stderr] 
Dec 12 16:28:28.603 INFO [stderr] warning: variant is never constructed: `Cont`
Dec 12 16:28:28.603 INFO [stderr]   --> src/tokens.rs:18:5
Dec 12 16:28:28.603 INFO [stderr]    |
Dec 12 16:28:28.603 INFO [stderr] 18 |     Cont,
Dec 12 16:28:28.603 INFO [stderr]    |     ^^^^
Dec 12 16:28:28.603 INFO [stderr]    |
Dec 12 16:28:28.603 INFO [stderr]    = note: #[warn(dead_code)] on by default
Dec 12 16:28:28.603 INFO [stderr] 
Dec 12 16:28:28.614 INFO [stderr] warning: unused `std::result::Result` that must be used
Dec 12 16:28:28.614 INFO [stderr]   --> src/repr.rs:41:9
Dec 12 16:28:28.614 INFO [stderr]    |
Dec 12 16:28:28.614 INFO [stderr] 41 |         write!(self.buf, "${}", x);
Dec 12 16:28:28.614 INFO [stderr]    |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^
Dec 12 16:28:28.614 INFO [stderr]    |
Dec 12 16:28:28.614 INFO [stderr]    = note: #[warn(unused_must_use)] on by default
Dec 12 16:28:28.614 INFO [stderr]    = note: this `Result` may be an `Err` variant, which should be handled
Dec 12 16:28:28.614 INFO [stderr]    = note: this error originates in a macro outside of the current crate (in Nightly builds, run with -Z external-macro-backtrace for more info)
Dec 12 16:28:28.614 INFO [stderr] 
Dec 12 16:28:28.614 INFO [stderr] warning: unused `std::result::Result` that must be used
Dec 12 16:28:28.614 INFO [stderr]   --> src/repr.rs:47:9
Dec 12 16:28:28.615 INFO [stderr]    |
Dec 12 16:28:28.615 INFO [stderr] 47 |         write!(self.buf, "{}", s);
Dec 12 16:28:28.615 INFO [stderr]    |         ^^^^^^^^^^^^^^^^^^^^^^^^^^
Dec 12 16:28:28.615 INFO [stderr]    |
Dec 12 16:28:28.615 INFO [stderr]    = note: this `Result` may be an `Err` variant, which should be handled
Dec 12 16:28:28.615 INFO [stderr]    = note: this error originates in a macro outside of the current crate (in Nightly builds, run with -Z external-macro-backtrace for more info)
Dec 12 16:28:28.615 INFO [stderr] 
Dec 12 16:28:28.615 INFO [stderr] warning: unused `std::result::Result` that must be used
Dec 12 16:28:28.615 INFO [stderr]   --> src/repr.rs:53:9
Dec 12 16:28:28.615 INFO [stderr]    |
Dec 12 16:28:28.615 INFO [stderr] 53 |         write!(self.buf, "{}", s);
Dec 12 16:28:28.615 INFO [stderr]    |         ^^^^^^^^^^^^^^^^^^^^^^^^^^
Dec 12 16:28:28.616 INFO [stderr]    |
Dec 12 16:28:28.616 INFO [stderr]    = note: this `Result` may be an `Err` variant, which should be handled
Dec 12 16:28:28.616 INFO [stderr]    = note: this error originates in a macro outside of the current crate (in Nightly builds, run with -Z external-macro-backtrace for more info)
Dec 12 16:28:28.616 INFO [stderr] 
Dec 12 16:28:28.620 INFO [stderr] warning: unused `std::result::Result` that must be used
Dec 12 16:28:28.620 INFO [stderr]   --> src/repr.rs:59:9
Dec 12 16:28:28.620 INFO [stderr]    |
Dec 12 16:28:28.620 INFO [stderr] 59 |         write!(self.buf, "{}{{", s);
Dec 12 16:28:28.620 INFO [stderr]    |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^
Dec 12 16:28:28.620 INFO [stderr]    |
Dec 12 16:28:28.620 INFO [stderr]    = note: this `Result` may be an `Err` variant, which should be handled
Dec 12 16:28:28.620 INFO [stderr]    = note: this error originates in a macro outside of the current crate (in Nightly builds, run with -Z external-macro-backtrace for more info)
Dec 12 16:28:28.620 INFO [stderr] 
Dec 12 16:28:28.621 INFO [stderr] warning: unused `std::result::Result` that must be used
Dec 12 16:28:28.621 INFO [stderr]   --> src/repr.rs:65:9
Dec 12 16:28:28.621 INFO [stderr]    |
Dec 12 16:28:28.621 INFO [stderr] 65 |         write!(self.buf, "}}");
Dec 12 16:28:28.621 INFO [stderr]    |         ^^^^^^^^^^^^^^^^^^^^^^^
Dec 12 16:28:28.621 INFO [stderr]    |
Dec 12 16:28:28.621 INFO [stderr]    = note: this `Result` may be an `Err` variant, which should be handled
Dec 12 16:28:28.621 INFO [stderr]    = note: this error originates in a macro outside of the current crate (in Nightly builds, run with -Z external-macro-backtrace for more info)
Dec 12 16:28:28.621 INFO [stderr] 
Dec 12 16:28:28.621 INFO [stderr] warning: unused `std::result::Result` that must be used
Dec 12 16:28:28.621 INFO [stderr]   --> src/repr.rs:71:13
Dec 12 16:28:28.621 INFO [stderr]    |
Dec 12 16:28:28.621 INFO [stderr] 71 |             write!(self.buf, "\n");
Dec 12 16:28:28.621 INFO [stderr]    |             ^^^^^^^^^^^^^^^^^^^^^^^
Dec 12 16:28:28.621 INFO [stderr]    |
Dec 12 16:28:28.621 INFO [stderr]    = note: this `Result` may be an `Err` variant, which should be handled
Dec 12 16:28:28.621 INFO [stderr]    = note: this error originates in a macro outside of the current crate (in Nightly builds, run with -Z external-macro-backtrace for more info)
Dec 12 16:28:28.622 INFO [stderr] 
Dec 12 16:28:28.622 INFO [stderr] warning: unused `std::result::Result` that must be used
Dec 12 16:28:28.622 INFO [stderr]   --> src/repr.rs:90:9
Dec 12 16:28:28.622 INFO [stderr]    |
Dec 12 16:28:28.622 INFO [stderr] 90 |         write!(buf, "[");
Dec 12 16:28:28.622 INFO [stderr]    |         ^^^^^^^^^^^^^^^^^
Dec 12 16:28:28.622 INFO [stderr]    |
Dec 12 16:28:28.622 INFO [stderr]    = note: this `Result` may be an `Err` variant, which should be handled
Dec 12 16:28:28.622 INFO [stderr]    = note: this error originates in a macro outside of the current crate (in Nightly builds, run with -Z external-macro-backtrace for more info)
Dec 12 16:28:28.622 INFO [stderr] 
Dec 12 16:28:28.622 INFO [stderr] warning: unused `std::result::Result` that must be used
Dec 12 16:28:28.622 INFO [stderr]    --> src/repr.rs:113:13
Dec 12 16:28:28.622 INFO [stderr]     |
Dec 12 16:28:28.622 INFO [stderr] 113 |             write!(self.buf, "]");
Dec 12 16:28:28.622 INFO [stderr]     |             ^^^^^^^^^^^^^^^^^^^^^^
Dec 12 16:28:28.622 INFO [stderr]     |
Dec 12 16:28:28.622 INFO [stderr]     = note: this `Result` may be an `Err` variant, which should be handled
Dec 12 16:28:28.623 INFO [stderr]     = note: this error originates in a macro outside of the current crate (in Nightly builds, run with -Z external-macro-backtrace for more info)
Dec 12 16:28:28.623 INFO [stderr] 
Dec 12 16:28:28.623 INFO [stderr] warning: unused `std::result::Result` that must be used
Dec 12 16:28:28.623 INFO [stderr]    --> src/repr.rs:120:9
Dec 12 16:28:28.623 INFO [stderr]     |
Dec 12 16:28:28.623 INFO [stderr] 120 |         write!(self.buf, "\"${}\"", x);
Dec 12 16:28:28.623 INFO [stderr]     |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
Dec 12 16:28:28.623 INFO [stderr]     |
Dec 12 16:28:28.623 INFO [stderr]     = note: this `Result` may be an `Err` variant, which should be handled
Dec 12 16:28:28.623 INFO [stderr]     = note: this error originates in a macro outside of the current crate (in Nightly builds, run with -Z external-macro-backtrace for more info)
Dec 12 16:28:28.623 INFO [stderr] 
Dec 12 16:28:28.623 INFO [stderr] warning: unused `std::result::Result` that must be used
Dec 12 16:28:28.623 INFO [stderr]    --> src/repr.rs:126:9
Dec 12 16:28:28.624 INFO [stderr]     |
Dec 12 16:28:28.624 INFO [stderr] 126 |         write!(self.buf, "{}", s);
Dec 12 16:28:28.624 INFO [stderr]     |         ^^^^^^^^^^^^^^^^^^^^^^^^^^
Dec 12 16:28:28.624 INFO [stderr]     |
Dec 12 16:28:28.624 INFO [stderr]     = note: this `Result` may be an `Err` variant, which should be handled
Dec 12 16:28:28.624 INFO [stderr]     = note: this error originates in a macro outside of the current crate (in Nightly builds, run with -Z external-macro-backtrace for more info)
Dec 12 16:28:28.625 INFO [stderr] 
Dec 12 16:28:28.625 INFO [stderr] warning: unused `std::result::Result` that must be used
Dec 12 16:28:28.625 INFO [stderr]    --> src/repr.rs:132:9
Dec 12 16:28:28.625 INFO [stderr]     |
Dec 12 16:28:28.626 INFO [stderr] 132 |         write!(self.buf, "\"{}\"", s);
Dec 12 16:28:28.626 INFO [stderr]     |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
Dec 12 16:28:28.626 INFO [stderr]     |
Dec 12 16:28:28.627 INFO [stderr]     = note: this `Result` may be an `Err` variant, which should be handled
Dec 12 16:28:28.627 INFO [stderr]     = note: this error originates in a macro outside of the current crate (in Nightly builds, run with -Z external-macro-backtrace for more info)
Dec 12 16:28:28.627 INFO [stderr] 
Dec 12 16:28:28.628 INFO [stderr] warning: unused `std::result::Result` that must be used
Dec 12 16:28:28.628 INFO [stderr]    --> src/repr.rs:138:9
Dec 12 16:28:28.628 INFO [stderr]     |
Dec 12 16:28:28.628 INFO [stderr] 138 |         write!(self.buf, "[\"{}\"", s);
Dec 12 16:28:28.629 INFO [stderr]     |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
Dec 12 16:28:28.629 INFO [stderr]     |
Dec 12 16:28:28.629 INFO [stderr]     = note: this `Result` may be an `Err` variant, which should be handled
Dec 12 16:28:28.629 INFO [stderr]     = note: this error originates in a macro outside of the current crate (in Nightly builds, run with -Z external-macro-backtrace for more info)
Dec 12 16:28:28.629 INFO [stderr] 
Dec 12 16:28:28.630 INFO [stderr] warning: unused `std::result::Result` that must be used
Dec 12 16:28:28.630 INFO [stderr]    --> src/repr.rs:143:9
Dec 12 16:28:28.630 INFO [stderr]     |
Dec 12 16:28:28.630 INFO [stderr] 143 |         write!(self.buf, "]");
Dec 12 16:28:28.630 INFO [stderr]     |         ^^^^^^^^^^^^^^^^^^^^^^
Dec 12 16:28:28.631 INFO [stderr]     |
Dec 12 16:28:28.631 INFO [stderr]     = note: this `Result` may be an `Err` variant, which should be handled
Dec 12 16:28:28.631 INFO [stderr]     = note: this error originates in a macro outside of the current crate (in Nightly builds, run with -Z external-macro-backtrace for more info)
Dec 12 16:28:28.631 INFO [stderr] 
Dec 12 16:28:28.924 INFO [stderr] warning: variant is never constructed: `Cont`
Dec 12 16:28:28.924 INFO [stderr]   --> src/tokens.rs:18:5
Dec 12 16:28:28.924 INFO [stderr]    |
Dec 12 16:28:28.924 INFO [stderr] 18 |     Cont,
Dec 12 16:28:28.924 INFO [stderr]    |     ^^^^
Dec 12 16:28:28.924 INFO [stderr]    |
Dec 12 16:28:28.924 INFO [stderr]    = note: #[warn(dead_code)] on by default
Dec 12 16:28:28.924 INFO [stderr] 
Dec 12 16:28:28.925 INFO [stderr] warning: unused `std::result::Result` that must be used
Dec 12 16:28:28.925 INFO [stderr]   --> src/repr.rs:41:9
Dec 12 16:28:28.925 INFO [stderr]    |
Dec 12 16:28:28.925 INFO [stderr] 41 |         write!(self.buf, "${}", x);
Dec 12 16:28:28.925 INFO [stderr]    |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^
Dec 12 16:28:28.925 INFO [stderr]    |
Dec 12 16:28:28.925 INFO [stderr]    = note: #[warn(unused_must_use)] on by default
Dec 12 16:28:28.925 INFO [stderr]    = note: this `Result` may be an `Err` variant, which should be handled
Dec 12 16:28:28.925 INFO [stderr]    = note: this error originates in a macro outside of the current crate (in Nightly builds, run with -Z external-macro-backtrace for more info)
Dec 12 16:28:28.925 INFO [stderr] 
Dec 12 16:28:28.925 INFO [stderr] warning: unused `std::result::Result` that must be used
Dec 12 16:28:28.925 INFO [stderr]   --> src/repr.rs:47:9
Dec 12 16:28:28.925 INFO [stderr]    |
Dec 12 16:28:28.925 INFO [stderr] 47 |         write!(self.buf, "{}", s);
Dec 12 16:28:28.925 INFO [stderr]    |         ^^^^^^^^^^^^^^^^^^^^^^^^^^
Dec 12 16:28:28.925 INFO [stderr]    |
Dec 12 16:28:28.925 INFO [stderr]    = note: this `Result` may be an `Err` variant, which should be handled
Dec 12 16:28:28.925 INFO [stderr]    = note: this error originates in a macro outside of the current crate (in Nightly builds, run with -Z external-macro-backtrace for more info)
Dec 12 16:28:28.925 INFO [stderr] 
Dec 12 16:28:28.925 INFO [stderr] warning: unused `std::result::Result` that must be used
Dec 12 16:28:28.925 INFO [stderr]   --> src/repr.rs:53:9
Dec 12 16:28:28.925 INFO [stderr]    |
Dec 12 16:28:28.925 INFO [stderr] 53 |         write!(self.buf, "{}", s);
Dec 12 16:28:28.925 INFO [stderr]    |         ^^^^^^^^^^^^^^^^^^^^^^^^^^
Dec 12 16:28:28.925 INFO [stderr]    |
Dec 12 16:28:28.925 INFO [stderr]    = note: this `Result` may be an `Err` variant, which should be handled
Dec 12 16:28:28.925 INFO [stderr]    = note: this error originates in a macro outside of the current crate (in Nightly builds, run with -Z external-macro-backtrace for more info)
Dec 12 16:28:28.925 INFO [stderr] 
Dec 12 16:28:28.925 INFO [stderr] warning: unused `std::result::Result` that must be used
Dec 12 16:28:28.925 INFO [stderr]   --> src/repr.rs:59:9
Dec 12 16:28:28.925 INFO [stderr]    |
Dec 12 16:28:28.925 INFO [stderr] 59 |         write!(self.buf, "{}{{", s);
Dec 12 16:28:28.925 INFO [stderr]    |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^
Dec 12 16:28:28.925 INFO [stderr]    |
Dec 12 16:28:28.925 INFO [stderr]    = note: this `Result` may be an `Err` variant, which should be handled
Dec 12 16:28:28.925 INFO [stderr]    = note: this error originates in a macro outside of the current crate (in Nightly builds, run with -Z external-macro-backtrace for more info)
Dec 12 16:28:28.925 INFO [stderr] 
Dec 12 16:28:28.925 INFO [stderr] warning: unused `std::result::Result` that must be used
Dec 12 16:28:28.925 INFO [stderr]   --> src/repr.rs:65:9
Dec 12 16:28:28.925 INFO [stderr]    |
Dec 12 16:28:28.925 INFO [stderr] 65 |         write!(self.buf, "}}");
Dec 12 16:28:28.925 INFO [stderr]    |         ^^^^^^^^^^^^^^^^^^^^^^^
Dec 12 16:28:28.925 INFO [stderr]    |
Dec 12 16:28:28.925 INFO [stderr]    = note: this `Result` may be an `Err` variant, which should be handled
Dec 12 16:28:28.925 INFO [stderr]    = note: this error originates in a macro outside of the current crate (in Nightly builds, run with -Z external-macro-backtrace for more info)
Dec 12 16:28:28.925 INFO [stderr] 
Dec 12 16:28:28.925 INFO [stderr] warning: unused `std::result::Result` that must be used
Dec 12 16:28:28.925 INFO [stderr]   --> src/repr.rs:71:13
Dec 12 16:28:28.925 INFO [stderr]    |
Dec 12 16:28:28.925 INFO [stderr] 71 |             write!(self.buf, "\n");
Dec 12 16:28:28.925 INFO [stderr]    |             ^^^^^^^^^^^^^^^^^^^^^^^
Dec 12 16:28:28.925 INFO [stderr]    |
Dec 12 16:28:28.925 INFO [stderr]    = note: this `Result` may be an `Err` variant, which should be handled
Dec 12 16:28:28.925 INFO [stderr]    = note: this error originates in a macro outside of the current crate (in Nightly builds, run with -Z external-macro-backtrace for more info)
Dec 12 16:28:28.925 INFO [stderr] 
Dec 12 16:28:28.928 INFO [stderr] warning: unused `std::result::Result` that must be used
Dec 12 16:28:28.928 INFO [stderr]   --> src/repr.rs:90:9
Dec 12 16:28:28.928 INFO [stderr]    |
Dec 12 16:28:28.928 INFO [stderr] 90 |         write!(buf, "[");
Dec 12 16:28:28.928 INFO [stderr]    |         ^^^^^^^^^^^^^^^^^
Dec 12 16:28:28.928 INFO [stderr]    |
Dec 12 16:28:28.928 INFO [stderr]    = note: this `Result` may be an `Err` variant, which should be handled
Dec 12 16:28:28.928 INFO [stderr]    = note: this error originates in a macro outside of the current crate (in Nightly builds, run with -Z external-macro-backtrace for more info)
Dec 12 16:28:28.928 INFO [stderr] 
Dec 12 16:28:28.928 INFO [stderr] warning: unused `std::result::Result` that must be used
Dec 12 16:28:28.928 INFO [stderr]    --> src/repr.rs:113:13
Dec 12 16:28:28.928 INFO [stderr]     |
Dec 12 16:28:28.928 INFO [stderr] 113 |             write!(self.buf, "]");
Dec 12 16:28:28.928 INFO [stderr]     |             ^^^^^^^^^^^^^^^^^^^^^^
Dec 12 16:28:28.928 INFO [stderr]     |
Dec 12 16:28:28.928 INFO [stderr]     = note: this `Result` may be an `Err` variant, which should be handled
Dec 12 16:28:28.928 INFO [stderr]     = note: this error originates in a macro outside of the current crate (in Nightly builds, run with -Z external-macro-backtrace for more info)
Dec 12 16:28:28.928 INFO [stderr] 
Dec 12 16:28:28.928 INFO [stderr] warning: unused `std::result::Result` that must be used
Dec 12 16:28:28.928 INFO [stderr]    --> src/repr.rs:120:9
Dec 12 16:28:28.928 INFO [stderr]     |
Dec 12 16:28:28.928 INFO [stderr] 120 |         write!(self.buf, "\"${}\"", x);
Dec 12 16:28:28.928 INFO [stderr]     |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
Dec 12 16:28:28.928 INFO [stderr]     |
Dec 12 16:28:28.928 INFO [stderr]     = note: this `Result` may be an `Err` variant, which should be handled
Dec 12 16:28:28.928 INFO [stderr]     = note: this error originates in a macro outside of the current crate (in Nightly builds, run with -Z external-macro-backtrace for more info)
Dec 12 16:28:28.928 INFO [stderr] 
Dec 12 16:28:28.928 INFO [stderr] warning: unused `std::result::Result` that must be used
Dec 12 16:28:28.928 INFO [stderr]    --> src/repr.rs:126:9
Dec 12 16:28:28.928 INFO [stderr]     |
Dec 12 16:28:28.928 INFO [stderr] 126 |         write!(self.buf, "{}", s);
Dec 12 16:28:28.929 INFO [stderr]     |         ^^^^^^^^^^^^^^^^^^^^^^^^^^
Dec 12 16:28:28.929 INFO [stderr]     |
Dec 12 16:28:28.929 INFO [stderr]     = note: this `Result` may be an `Err` variant, which should be handled
Dec 12 16:28:28.929 INFO [stderr]     = note: this error originates in a macro outside of the current crate (in Nightly builds, run with -Z external-macro-backtrace for more info)
Dec 12 16:28:28.929 INFO [stderr] 
Dec 12 16:28:28.929 INFO [stderr] warning: unused `std::result::Result` that must be used
Dec 12 16:28:28.929 INFO [stderr]    --> src/repr.rs:132:9
Dec 12 16:28:28.929 INFO [stderr]     |
Dec 12 16:28:28.929 INFO [stderr] 132 |         write!(self.buf, "\"{}\"", s);
Dec 12 16:28:28.929 INFO [stderr]     |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
Dec 12 16:28:28.929 INFO [stderr]     |
Dec 12 16:28:28.929 INFO [stderr]     = note: this `Result` may be an `Err` variant, which should be handled
Dec 12 16:28:28.929 INFO [stderr]     = note: this error originates in a macro outside of the current crate (in Nightly builds, run with -Z external-macro-backtrace for more info)
Dec 12 16:28:28.929 INFO [stderr] 
Dec 12 16:28:28.929 INFO [stderr] warning: unused `std::result::Result` that must be used
Dec 12 16:28:28.929 INFO [stderr]    --> src/repr.rs:138:9
Dec 12 16:28:28.929 INFO [stderr]     |
Dec 12 16:28:28.929 INFO [stderr] 138 |         write!(self.buf, "[\"{}\"", s);
Dec 12 16:28:28.929 INFO [stderr]     |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
Dec 12 16:28:28.929 INFO [stderr]     |
Dec 12 16:28:28.929 INFO [stderr]     = note: this `Result` may be an `Err` variant, which should be handled
Dec 12 16:28:28.929 INFO [stderr]     = note: this error originates in a macro outside of the current crate (in Nightly builds, run with -Z external-macro-backtrace for more info)
Dec 12 16:28:28.929 INFO [stderr] 
Dec 12 16:28:28.929 INFO [stderr] warning: unused `std::result::Result` that must be used
Dec 12 16:28:28.929 INFO [stderr]    --> src/repr.rs:143:9
Dec 12 16:28:28.929 INFO [stderr]     |
Dec 12 16:28:28.929 INFO [stderr] 143 |         write!(self.buf, "]");
Dec 12 16:28:28.929 INFO [stderr]     |         ^^^^^^^^^^^^^^^^^^^^^^
Dec 12 16:28:28.929 INFO [stderr]     |
Dec 12 16:28:28.929 INFO [stderr]     = note: this `Result` may be an `Err` variant, which should be handled
Dec 12 16:28:28.929 INFO [stderr]     = note: this error originates in a macro outside of the current crate (in Nightly builds, run with -Z external-macro-backtrace for more info)
Dec 12 16:28:28.929 INFO [stderr] 
Dec 12 16:28:30.962 INFO [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 11.68s
Dec 12 16:28:30.976 INFO [stderr] su: No module specific data is present
Dec 12 16:28:31.602 INFO running `"docker" "inspect" "a847b55c98215b5a175d1a4fab33adeca1c8759b7e11307ac70c6c1a8635b868"`
Dec 12 16:28:31.900 INFO running `"docker" "rm" "-f" "a847b55c98215b5a175d1a4fab33adeca1c8759b7e11307ac70c6c1a8635b868"`
Dec 12 16:28:32.228 INFO [stdout] a847b55c98215b5a175d1a4fab33adeca1c8759b7e11307ac70c6c1a8635b868