Nov 27 11:00:09.429 INFO testing comacro-0.0.1 against beta-2018-11-24 for beta-1.31-4
Nov 27 11:00:09.431 INFO running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/beta-1.31-4/worker-4/beta-2018-11-24:/target:rw,Z" "-v" "/mnt/big/crater/work/local/test-source/worker-4/beta-1.31-4/beta-2018-11-24:/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 +beta-2018-11-24 build --frozen" "-e" "CARGO_TARGET_DIR=/target" "-e" "CARGO_INCREMENTAL=0" "-e" "RUST_BACKTRACE=full" "-e" "RUSTFLAGS=--cap-lints=warn" "-e" "CARGO_HOME=/cargo-home" "-e" "RUSTUP_HOME=/rustup-home" "-m" "1536M" "--network" "none" "crater"`
Nov 27 11:00:09.849 INFO [stdout] 70f3a36fddfdf186700da41d62008aac7d5e733554b0b9e4cd512069b34a7a00
Nov 27 11:00:09.857 INFO running `"docker" "start" "-a" "70f3a36fddfdf186700da41d62008aac7d5e733554b0b9e4cd512069b34a7a00"`
Nov 27 11:00:10.885 INFO [stderr] usermod: no changes
Nov 27 11:00:11.056 INFO [stderr]    Compiling log v0.4.6
Nov 27 11:00:11.056 INFO [stderr]    Compiling syn v0.15.22
Nov 27 11:00:27.140 INFO [stderr]    Compiling comacro v0.0.1 (/source)
Nov 27 11:00:31.316 INFO [stderr] warning: unnecessary parentheses around pattern
Nov 27 11:00:31.316 INFO [stderr]   --> src/trace.rs:84:21
Nov 27 11:00:31.316 INFO [stderr]    |
Nov 27 11:00:31.316 INFO [stderr] 84 |                 let ((&x, rest)) = rest.split_first().unwrap();
Nov 27 11:00:31.316 INFO [stderr]    |                     ^^^^^^^^^^^^ help: remove these parentheses
Nov 27 11:00:31.316 INFO [stderr]    |
Nov 27 11:00:31.316 INFO [stderr]    = note: #[warn(unused_parens)] on by default
Nov 27 11:00:31.316 INFO [stderr] 
Nov 27 11:00:31.680 INFO [stderr] warning: unused variable: `x`
Nov 27 11:00:31.680 INFO [stderr]    --> src/repr.rs:270:29
Nov 27 11:00:31.680 INFO [stderr]     |
Nov 27 11:00:31.680 INFO [stderr] 270 |     fn push_byte(&mut self, x: u8) {}
Nov 27 11:00:31.680 INFO [stderr]     |                             ^ help: consider using `_x` instead
Nov 27 11:00:31.680 INFO [stderr]     |
Nov 27 11:00:31.680 INFO [stderr]     = note: #[warn(unused_variables)] on by default
Nov 27 11:00:31.680 INFO [stderr] 
Nov 27 11:00:31.680 INFO [stderr] warning: unused variable: `x`
Nov 27 11:00:31.680 INFO [stderr]    --> src/repr.rs:271:32
Nov 27 11:00:31.680 INFO [stderr]     |
Nov 27 11:00:31.680 INFO [stderr] 271 |     fn extend_bytes(&mut self, x: &[u8]) {}
Nov 27 11:00:31.680 INFO [stderr]     |                                ^ help: consider using `_x` instead
Nov 27 11:00:31.680 INFO [stderr] 
Nov 27 11:00:31.840 INFO [stderr] warning: variant is never constructed: `Cont`
Nov 27 11:00:31.840 INFO [stderr]   --> src/tokens.rs:18:5
Nov 27 11:00:31.840 INFO [stderr]    |
Nov 27 11:00:31.840 INFO [stderr] 18 |     Cont,
Nov 27 11:00:31.841 INFO [stderr]    |     ^^^^
Nov 27 11:00:31.841 INFO [stderr]    |
Nov 27 11:00:31.841 INFO [stderr]    = note: #[warn(dead_code)] on by default
Nov 27 11:00:31.841 INFO [stderr] 
Nov 27 11:00:31.841 INFO [stderr] warning: unused `std::result::Result` that must be used
Nov 27 11:00:31.841 INFO [stderr]   --> src/repr.rs:41:9
Nov 27 11:00:31.841 INFO [stderr]    |
Nov 27 11:00:31.841 INFO [stderr] 41 |         write!(self.buf, "${}", x);
Nov 27 11:00:31.841 INFO [stderr]    |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^
Nov 27 11:00:31.841 INFO [stderr]    |
Nov 27 11:00:31.841 INFO [stderr]    = note: #[warn(unused_must_use)] on by default
Nov 27 11:00:31.841 INFO [stderr]    = note: this `Result` may be an `Err` variant, which should be handled
Nov 27 11:00:31.841 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)
Nov 27 11:00:31.841 INFO [stderr] 
Nov 27 11:00:31.841 INFO [stderr] warning: unused `std::result::Result` that must be used
Nov 27 11:00:31.841 INFO [stderr]   --> src/repr.rs:47:9
Nov 27 11:00:31.841 INFO [stderr]    |
Nov 27 11:00:31.841 INFO [stderr] 47 |         write!(self.buf, "{}", s);
Nov 27 11:00:31.841 INFO [stderr]    |         ^^^^^^^^^^^^^^^^^^^^^^^^^^
Nov 27 11:00:31.841 INFO [stderr]    |
Nov 27 11:00:31.841 INFO [stderr]    = note: this `Result` may be an `Err` variant, which should be handled
Nov 27 11:00:31.841 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)
Nov 27 11:00:31.841 INFO [stderr] 
Nov 27 11:00:31.841 INFO [stderr] warning: unused `std::result::Result` that must be used
Nov 27 11:00:31.841 INFO [stderr]   --> src/repr.rs:53:9
Nov 27 11:00:31.841 INFO [stderr]    |
Nov 27 11:00:31.841 INFO [stderr] 53 |         write!(self.buf, "{}", s);
Nov 27 11:00:31.841 INFO [stderr]    |         ^^^^^^^^^^^^^^^^^^^^^^^^^^
Nov 27 11:00:31.841 INFO [stderr]    |
Nov 27 11:00:31.841 INFO [stderr]    = note: this `Result` may be an `Err` variant, which should be handled
Nov 27 11:00:31.841 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)
Nov 27 11:00:31.841 INFO [stderr] 
Nov 27 11:00:31.841 INFO [stderr] warning: unused `std::result::Result` that must be used
Nov 27 11:00:31.841 INFO [stderr]   --> src/repr.rs:59:9
Nov 27 11:00:31.841 INFO [stderr]    |
Nov 27 11:00:31.841 INFO [stderr] 59 |         write!(self.buf, "{}{{", s);
Nov 27 11:00:31.841 INFO [stderr]    |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^
Nov 27 11:00:31.841 INFO [stderr]    |
Nov 27 11:00:31.841 INFO [stderr]    = note: this `Result` may be an `Err` variant, which should be handled
Nov 27 11:00:31.841 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)
Nov 27 11:00:31.841 INFO [stderr] 
Nov 27 11:00:31.841 INFO [stderr] warning: unused `std::result::Result` that must be used
Nov 27 11:00:31.841 INFO [stderr]   --> src/repr.rs:65:9
Nov 27 11:00:31.841 INFO [stderr]    |
Nov 27 11:00:31.841 INFO [stderr] 65 |         write!(self.buf, "}}");
Nov 27 11:00:31.841 INFO [stderr]    |         ^^^^^^^^^^^^^^^^^^^^^^^
Nov 27 11:00:31.841 INFO [stderr]    |
Nov 27 11:00:31.841 INFO [stderr]    = note: this `Result` may be an `Err` variant, which should be handled
Nov 27 11:00:31.841 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)
Nov 27 11:00:31.841 INFO [stderr] 
Nov 27 11:00:31.841 INFO [stderr] warning: unused `std::result::Result` that must be used
Nov 27 11:00:31.841 INFO [stderr]   --> src/repr.rs:71:13
Nov 27 11:00:31.841 INFO [stderr]    |
Nov 27 11:00:31.841 INFO [stderr] 71 |             write!(self.buf, "\n");
Nov 27 11:00:31.841 INFO [stderr]    |             ^^^^^^^^^^^^^^^^^^^^^^^
Nov 27 11:00:31.841 INFO [stderr]    |
Nov 27 11:00:31.841 INFO [stderr]    = note: this `Result` may be an `Err` variant, which should be handled
Nov 27 11:00:31.841 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)
Nov 27 11:00:31.841 INFO [stderr] 
Nov 27 11:00:31.841 INFO [stderr] warning: unused `std::result::Result` that must be used
Nov 27 11:00:31.841 INFO [stderr]   --> src/repr.rs:90:9
Nov 27 11:00:31.841 INFO [stderr]    |
Nov 27 11:00:31.841 INFO [stderr] 90 |         write!(buf, "[");
Nov 27 11:00:31.841 INFO [stderr]    |         ^^^^^^^^^^^^^^^^^
Nov 27 11:00:31.841 INFO [stderr]    |
Nov 27 11:00:31.841 INFO [stderr]    = note: this `Result` may be an `Err` variant, which should be handled
Nov 27 11:00:31.841 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)
Nov 27 11:00:31.841 INFO [stderr] 
Nov 27 11:00:31.841 INFO [stderr] warning: unused `std::result::Result` that must be used
Nov 27 11:00:31.841 INFO [stderr]    --> src/repr.rs:113:13
Nov 27 11:00:31.841 INFO [stderr]     |
Nov 27 11:00:31.841 INFO [stderr] 113 |             write!(self.buf, "]");
Nov 27 11:00:31.841 INFO [stderr]     |             ^^^^^^^^^^^^^^^^^^^^^^
Nov 27 11:00:31.841 INFO [stderr]     |
Nov 27 11:00:31.841 INFO [stderr]     = note: this `Result` may be an `Err` variant, which should be handled
Nov 27 11:00:31.841 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)
Nov 27 11:00:31.841 INFO [stderr] 
Nov 27 11:00:31.841 INFO [stderr] warning: unused `std::result::Result` that must be used
Nov 27 11:00:31.841 INFO [stderr]    --> src/repr.rs:120:9
Nov 27 11:00:31.841 INFO [stderr]     |
Nov 27 11:00:31.841 INFO [stderr] 120 |         write!(self.buf, "\"${}\"", x);
Nov 27 11:00:31.841 INFO [stderr]     |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
Nov 27 11:00:31.841 INFO [stderr]     |
Nov 27 11:00:31.841 INFO [stderr]     = note: this `Result` may be an `Err` variant, which should be handled
Nov 27 11:00:31.848 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)
Nov 27 11:00:31.848 INFO [stderr] 
Nov 27 11:00:31.848 INFO [stderr] warning: unused `std::result::Result` that must be used
Nov 27 11:00:31.848 INFO [stderr]    --> src/repr.rs:126:9
Nov 27 11:00:31.848 INFO [stderr]     |
Nov 27 11:00:31.848 INFO [stderr] 126 |         write!(self.buf, "{}", s);
Nov 27 11:00:31.848 INFO [stderr]     |         ^^^^^^^^^^^^^^^^^^^^^^^^^^
Nov 27 11:00:31.848 INFO [stderr]     |
Nov 27 11:00:31.848 INFO [stderr]     = note: this `Result` may be an `Err` variant, which should be handled
Nov 27 11:00:31.848 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)
Nov 27 11:00:31.848 INFO [stderr] 
Nov 27 11:00:31.848 INFO [stderr] warning: unused `std::result::Result` that must be used
Nov 27 11:00:31.848 INFO [stderr]    --> src/repr.rs:132:9
Nov 27 11:00:31.848 INFO [stderr]     |
Nov 27 11:00:31.848 INFO [stderr] 132 |         write!(self.buf, "\"{}\"", s);
Nov 27 11:00:31.848 INFO [stderr]     |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
Nov 27 11:00:31.848 INFO [stderr]     |
Nov 27 11:00:31.848 INFO [stderr]     = note: this `Result` may be an `Err` variant, which should be handled
Nov 27 11:00:31.848 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)
Nov 27 11:00:31.848 INFO [stderr] 
Nov 27 11:00:31.848 INFO [stderr] warning: unused `std::result::Result` that must be used
Nov 27 11:00:31.848 INFO [stderr]    --> src/repr.rs:138:9
Nov 27 11:00:31.848 INFO [stderr]     |
Nov 27 11:00:31.848 INFO [stderr] 138 |         write!(self.buf, "[\"{}\"", s);
Nov 27 11:00:31.849 INFO [stderr]     |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
Nov 27 11:00:31.849 INFO [stderr]     |
Nov 27 11:00:31.849 INFO [stderr]     = note: this `Result` may be an `Err` variant, which should be handled
Nov 27 11:00:31.849 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)
Nov 27 11:00:31.849 INFO [stderr] 
Nov 27 11:00:31.849 INFO [stderr] warning: unused `std::result::Result` that must be used
Nov 27 11:00:31.849 INFO [stderr]    --> src/repr.rs:143:9
Nov 27 11:00:31.849 INFO [stderr]     |
Nov 27 11:00:31.849 INFO [stderr] 143 |         write!(self.buf, "]");
Nov 27 11:00:31.849 INFO [stderr]     |         ^^^^^^^^^^^^^^^^^^^^^^
Nov 27 11:00:31.849 INFO [stderr]     |
Nov 27 11:00:31.849 INFO [stderr]     = note: this `Result` may be an `Err` variant, which should be handled
Nov 27 11:00:31.849 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)
Nov 27 11:00:31.849 INFO [stderr] 
Nov 27 11:00:34.684 INFO [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 23.75s
Nov 27 11:00:34.690 INFO [stderr] su: No module specific data is present
Nov 27 11:00:34.966 INFO running `"docker" "inspect" "70f3a36fddfdf186700da41d62008aac7d5e733554b0b9e4cd512069b34a7a00"`
Nov 27 11:00:35.067 INFO running `"docker" "rm" "-f" "70f3a36fddfdf186700da41d62008aac7d5e733554b0b9e4cd512069b34a7a00"`
Nov 27 11:00:35.178 INFO [stdout] 70f3a36fddfdf186700da41d62008aac7d5e733554b0b9e4cd512069b34a7a00
Nov 27 11:00:35.180 INFO running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/beta-1.31-4/worker-4/beta-2018-11-24:/target:rw,Z" "-v" "/mnt/big/crater/work/local/test-source/worker-4/beta-1.31-4/beta-2018-11-24:/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 +beta-2018-11-24 test --frozen --no-run" "-e" "CARGO_TARGET_DIR=/target" "-e" "CARGO_INCREMENTAL=0" "-e" "RUST_BACKTRACE=full" "-e" "RUSTFLAGS=--cap-lints=warn" "-e" "CARGO_HOME=/cargo-home" "-e" "RUSTUP_HOME=/rustup-home" "-m" "1536M" "--network" "none" "crater"`
Nov 27 11:00:35.406 INFO [stdout] eb52f9ca71bb4c0bd873c80a7cbbb756c40d6b0e26b44b530f3e1a9a7b90c5c8
Nov 27 11:00:35.409 INFO running `"docker" "start" "-a" "eb52f9ca71bb4c0bd873c80a7cbbb756c40d6b0e26b44b530f3e1a9a7b90c5c8"`
Nov 27 11:00:35.933 INFO [stderr] usermod: no changes
Nov 27 11:00:36.032 INFO [stderr]    Compiling env_logger v0.5.13
Nov 27 11:00:38.024 INFO [stderr]    Compiling comacro v0.0.1 (/source)
Nov 27 11:00:42.220 INFO [stderr] warning: unnecessary parentheses around pattern
Nov 27 11:00:42.220 INFO [stderr]   --> src/trace.rs:84:21
Nov 27 11:00:42.220 INFO [stderr]    |
Nov 27 11:00:42.220 INFO [stderr] 84 |                 let ((&x, rest)) = rest.split_first().unwrap();
Nov 27 11:00:42.220 INFO [stderr]    |                     ^^^^^^^^^^^^ help: remove these parentheses
Nov 27 11:00:42.220 INFO [stderr]    |
Nov 27 11:00:42.220 INFO [stderr]    = note: #[warn(unused_parens)] on by default
Nov 27 11:00:42.220 INFO [stderr] 
Nov 27 11:00:42.660 INFO [stderr] warning: unused variable: `x`
Nov 27 11:00:42.660 INFO [stderr]    --> src/repr.rs:270:29
Nov 27 11:00:42.660 INFO [stderr]     |
Nov 27 11:00:42.660 INFO [stderr] 270 |     fn push_byte(&mut self, x: u8) {}
Nov 27 11:00:42.660 INFO [stderr]     |                             ^ help: consider using `_x` instead
Nov 27 11:00:42.660 INFO [stderr]     |
Nov 27 11:00:42.660 INFO [stderr]     = note: #[warn(unused_variables)] on by default
Nov 27 11:00:42.660 INFO [stderr] 
Nov 27 11:00:42.660 INFO [stderr] warning: unused variable: `x`
Nov 27 11:00:42.660 INFO [stderr]    --> src/repr.rs:271:32
Nov 27 11:00:42.660 INFO [stderr]     |
Nov 27 11:00:42.660 INFO [stderr] 271 |     fn extend_bytes(&mut self, x: &[u8]) {}
Nov 27 11:00:42.660 INFO [stderr]     |                                ^ help: consider using `_x` instead
Nov 27 11:00:42.660 INFO [stderr] 
Nov 27 11:00:42.872 INFO [stderr] warning: variant is never constructed: `Cont`
Nov 27 11:00:42.872 INFO [stderr]   --> src/tokens.rs:18:5
Nov 27 11:00:42.872 INFO [stderr]    |
Nov 27 11:00:42.872 INFO [stderr] 18 |     Cont,
Nov 27 11:00:42.872 INFO [stderr]    |     ^^^^
Nov 27 11:00:42.872 INFO [stderr]    |
Nov 27 11:00:42.872 INFO [stderr]    = note: #[warn(dead_code)] on by default
Nov 27 11:00:42.872 INFO [stderr] 
Nov 27 11:00:42.876 INFO [stderr] warning: unused `std::result::Result` that must be used
Nov 27 11:00:42.876 INFO [stderr]   --> src/repr.rs:41:9
Nov 27 11:00:42.884 INFO [stderr]    |
Nov 27 11:00:42.884 INFO [stderr] 41 |         write!(self.buf, "${}", x);
Nov 27 11:00:42.884 INFO [stderr]    |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^
Nov 27 11:00:42.884 INFO [stderr]    |
Nov 27 11:00:42.884 INFO [stderr]    = note: #[warn(unused_must_use)] on by default
Nov 27 11:00:42.884 INFO [stderr]    = note: this `Result` may be an `Err` variant, which should be handled
Nov 27 11:00:42.884 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)
Nov 27 11:00:42.884 INFO [stderr] 
Nov 27 11:00:42.884 INFO [stderr] warning: unused `std::result::Result` that must be used
Nov 27 11:00:42.884 INFO [stderr]   --> src/repr.rs:47:9
Nov 27 11:00:42.884 INFO [stderr]    |
Nov 27 11:00:42.884 INFO [stderr] 47 |         write!(self.buf, "{}", s);
Nov 27 11:00:42.884 INFO [stderr]    |         ^^^^^^^^^^^^^^^^^^^^^^^^^^
Nov 27 11:00:42.884 INFO [stderr]    |
Nov 27 11:00:42.884 INFO [stderr]    = note: this `Result` may be an `Err` variant, which should be handled
Nov 27 11:00:42.884 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)
Nov 27 11:00:42.884 INFO [stderr] 
Nov 27 11:00:42.884 INFO [stderr] warning: unused `std::result::Result` that must be used
Nov 27 11:00:42.884 INFO [stderr]   --> src/repr.rs:53:9
Nov 27 11:00:42.884 INFO [stderr]    |
Nov 27 11:00:42.884 INFO [stderr] 53 |         write!(self.buf, "{}", s);
Nov 27 11:00:42.884 INFO [stderr]    |         ^^^^^^^^^^^^^^^^^^^^^^^^^^
Nov 27 11:00:42.884 INFO [stderr]    |
Nov 27 11:00:42.884 INFO [stderr]    = note: this `Result` may be an `Err` variant, which should be handled
Nov 27 11:00:42.884 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)
Nov 27 11:00:42.884 INFO [stderr] 
Nov 27 11:00:42.884 INFO [stderr] warning: unused `std::result::Result` that must be used
Nov 27 11:00:42.884 INFO [stderr]   --> src/repr.rs:59:9
Nov 27 11:00:42.884 INFO [stderr]    |
Nov 27 11:00:42.884 INFO [stderr] 59 |         write!(self.buf, "{}{{", s);
Nov 27 11:00:42.884 INFO [stderr]    |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^
Nov 27 11:00:42.884 INFO [stderr]    |
Nov 27 11:00:42.884 INFO [stderr]    = note: this `Result` may be an `Err` variant, which should be handled
Nov 27 11:00:42.884 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)
Nov 27 11:00:42.884 INFO [stderr] 
Nov 27 11:00:42.884 INFO [stderr] warning: unused `std::result::Result` that must be used
Nov 27 11:00:42.884 INFO [stderr]   --> src/repr.rs:65:9
Nov 27 11:00:42.884 INFO [stderr]    |
Nov 27 11:00:42.884 INFO [stderr] 65 |         write!(self.buf, "}}");
Nov 27 11:00:42.884 INFO [stderr]    |         ^^^^^^^^^^^^^^^^^^^^^^^
Nov 27 11:00:42.884 INFO [stderr]    |
Nov 27 11:00:42.884 INFO [stderr]    = note: this `Result` may be an `Err` variant, which should be handled
Nov 27 11:00:42.884 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)
Nov 27 11:00:42.884 INFO [stderr] 
Nov 27 11:00:42.885 INFO [stderr] warning: unused `std::result::Result` that must be used
Nov 27 11:00:42.885 INFO [stderr]   --> src/repr.rs:71:13
Nov 27 11:00:42.885 INFO [stderr]    |
Nov 27 11:00:42.885 INFO [stderr] 71 |             write!(self.buf, "\n");
Nov 27 11:00:42.885 INFO [stderr]    |             ^^^^^^^^^^^^^^^^^^^^^^^
Nov 27 11:00:42.885 INFO [stderr]    |
Nov 27 11:00:42.885 INFO [stderr]    = note: this `Result` may be an `Err` variant, which should be handled
Nov 27 11:00:42.885 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)
Nov 27 11:00:42.885 INFO [stderr] 
Nov 27 11:00:42.885 INFO [stderr] warning: unused `std::result::Result` that must be used
Nov 27 11:00:42.885 INFO [stderr]   --> src/repr.rs:90:9
Nov 27 11:00:42.885 INFO [stderr]    |
Nov 27 11:00:42.885 INFO [stderr] 90 |         write!(buf, "[");
Nov 27 11:00:42.885 INFO [stderr]    |         ^^^^^^^^^^^^^^^^^
Nov 27 11:00:42.885 INFO [stderr]    |
Nov 27 11:00:42.885 INFO [stderr]    = note: this `Result` may be an `Err` variant, which should be handled
Nov 27 11:00:42.885 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)
Nov 27 11:00:42.885 INFO [stderr] 
Nov 27 11:00:42.885 INFO [stderr] warning: unused `std::result::Result` that must be used
Nov 27 11:00:42.885 INFO [stderr]    --> src/repr.rs:113:13
Nov 27 11:00:42.885 INFO [stderr]     |
Nov 27 11:00:42.885 INFO [stderr] 113 |             write!(self.buf, "]");
Nov 27 11:00:42.885 INFO [stderr]     |             ^^^^^^^^^^^^^^^^^^^^^^
Nov 27 11:00:42.885 INFO [stderr]     |
Nov 27 11:00:42.885 INFO [stderr]     = note: this `Result` may be an `Err` variant, which should be handled
Nov 27 11:00:42.885 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)
Nov 27 11:00:42.885 INFO [stderr] 
Nov 27 11:00:42.885 INFO [stderr] warning: unused `std::result::Result` that must be used
Nov 27 11:00:42.885 INFO [stderr]    --> src/repr.rs:120:9
Nov 27 11:00:42.885 INFO [stderr]     |
Nov 27 11:00:42.885 INFO [stderr] 120 |         write!(self.buf, "\"${}\"", x);
Nov 27 11:00:42.885 INFO [stderr]     |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
Nov 27 11:00:42.885 INFO [stderr]     |
Nov 27 11:00:42.885 INFO [stderr]     = note: this `Result` may be an `Err` variant, which should be handled
Nov 27 11:00:42.885 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)
Nov 27 11:00:42.885 INFO [stderr] 
Nov 27 11:00:42.885 INFO [stderr] warning: unused `std::result::Result` that must be used
Nov 27 11:00:42.885 INFO [stderr]    --> src/repr.rs:126:9
Nov 27 11:00:42.885 INFO [stderr]     |
Nov 27 11:00:42.885 INFO [stderr] 126 |         write!(self.buf, "{}", s);
Nov 27 11:00:42.885 INFO [stderr]     |         ^^^^^^^^^^^^^^^^^^^^^^^^^^
Nov 27 11:00:42.885 INFO [stderr]     |
Nov 27 11:00:42.885 INFO [stderr]     = note: this `Result` may be an `Err` variant, which should be handled
Nov 27 11:00:42.885 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)
Nov 27 11:00:42.885 INFO [stderr] 
Nov 27 11:00:42.885 INFO [stderr] warning: unused `std::result::Result` that must be used
Nov 27 11:00:42.885 INFO [stderr]    --> src/repr.rs:132:9
Nov 27 11:00:42.885 INFO [stderr]     |
Nov 27 11:00:42.885 INFO [stderr] 132 |         write!(self.buf, "\"{}\"", s);
Nov 27 11:00:42.885 INFO [stderr]     |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
Nov 27 11:00:42.885 INFO [stderr]     |
Nov 27 11:00:42.885 INFO [stderr]     = note: this `Result` may be an `Err` variant, which should be handled
Nov 27 11:00:42.885 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)
Nov 27 11:00:42.885 INFO [stderr] 
Nov 27 11:00:42.885 INFO [stderr] warning: unused `std::result::Result` that must be used
Nov 27 11:00:42.885 INFO [stderr]    --> src/repr.rs:138:9
Nov 27 11:00:42.885 INFO [stderr]     |
Nov 27 11:00:42.885 INFO [stderr] 138 |         write!(self.buf, "[\"{}\"", s);
Nov 27 11:00:42.885 INFO [stderr]     |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
Nov 27 11:00:42.885 INFO [stderr]     |
Nov 27 11:00:42.885 INFO [stderr]     = note: this `Result` may be an `Err` variant, which should be handled
Nov 27 11:00:42.885 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)
Nov 27 11:00:42.885 INFO [stderr] 
Nov 27 11:00:42.885 INFO [stderr] warning: unused `std::result::Result` that must be used
Nov 27 11:00:42.885 INFO [stderr]    --> src/repr.rs:143:9
Nov 27 11:00:42.885 INFO [stderr]     |
Nov 27 11:00:42.885 INFO [stderr] 143 |         write!(self.buf, "]");
Nov 27 11:00:42.885 INFO [stderr]     |         ^^^^^^^^^^^^^^^^^^^^^^
Nov 27 11:00:42.885 INFO [stderr]     |
Nov 27 11:00:42.885 INFO [stderr]     = note: this `Result` may be an `Err` variant, which should be handled
Nov 27 11:00:42.885 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)
Nov 27 11:00:42.885 INFO [stderr] 
Nov 27 11:00:45.284 INFO [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 9.33s
Nov 27 11:00:45.289 INFO [stderr] su: No module specific data is present
Nov 27 11:00:46.035 INFO running `"docker" "inspect" "eb52f9ca71bb4c0bd873c80a7cbbb756c40d6b0e26b44b530f3e1a9a7b90c5c8"`
Nov 27 11:00:46.325 INFO running `"docker" "rm" "-f" "eb52f9ca71bb4c0bd873c80a7cbbb756c40d6b0e26b44b530f3e1a9a7b90c5c8"`
Nov 27 11:00:46.597 INFO [stdout] eb52f9ca71bb4c0bd873c80a7cbbb756c40d6b0e26b44b530f3e1a9a7b90c5c8
Nov 27 11:00:46.608 INFO running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/beta-1.31-4/worker-4/beta-2018-11-24:/target:rw,Z" "-v" "/mnt/big/crater/work/local/test-source/worker-4/beta-1.31-4/beta-2018-11-24:/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 +beta-2018-11-24 test --frozen" "-e" "CARGO_TARGET_DIR=/target" "-e" "CARGO_INCREMENTAL=0" "-e" "RUST_BACKTRACE=full" "-e" "RUSTFLAGS=--cap-lints=warn" "-e" "CARGO_HOME=/cargo-home" "-e" "RUSTUP_HOME=/rustup-home" "-m" "1536M" "--network" "none" "crater"`
Nov 27 11:00:47.050 INFO [stdout] fdf0ebc1838f83452d56247fcf6e7f00ac4bc36e8962bbf529f3c06702e84ffd
Nov 27 11:00:47.055 INFO running `"docker" "start" "-a" "fdf0ebc1838f83452d56247fcf6e7f00ac4bc36e8962bbf529f3c06702e84ffd"`
Nov 27 11:00:47.894 INFO [stderr] usermod: no changes
Nov 27 11:00:47.992 INFO [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 0.07s
Nov 27 11:00:48.005 INFO [stderr]      Running /target/debug/deps/comacro-fdc1cd6e66dd0449
Nov 27 11:00:48.010 INFO [stdout] 
Nov 27 11:00:48.010 INFO [stdout] running 0 tests
Nov 27 11:00:48.011 INFO [stdout] 
Nov 27 11:00:48.011 INFO [stdout] test result: ok. 0 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out
Nov 27 11:00:48.011 INFO [stdout] 
Nov 27 11:00:48.012 INFO [stderr]    Doc-tests comacro
Nov 27 11:00:55.288 INFO [stdout] 
Nov 27 11:00:55.288 INFO [stdout] running 0 tests
Nov 27 11:00:55.288 INFO [stdout] 
Nov 27 11:00:55.288 INFO [stdout] test result: ok. 0 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out
Nov 27 11:00:55.288 INFO [stdout] 
Nov 27 11:00:55.299 INFO [stderr] su: No module specific data is present
Nov 27 11:00:56.054 INFO running `"docker" "inspect" "fdf0ebc1838f83452d56247fcf6e7f00ac4bc36e8962bbf529f3c06702e84ffd"`
Nov 27 11:00:56.276 INFO running `"docker" "rm" "-f" "fdf0ebc1838f83452d56247fcf6e7f00ac4bc36e8962bbf529f3c06702e84ffd"`
Nov 27 11:00:56.507 INFO [stdout] fdf0ebc1838f83452d56247fcf6e7f00ac4bc36e8962bbf529f3c06702e84ffd