[INFO] fetching crate ruly 2.0.0...
[INFO] checking ruly-2.0.0 against master#33fdb797f59421c7bbecaa4588ed5d7a31a9494a for pr-87190-3
[INFO] extracting crate ruly 2.0.0 into /workspace/builds/worker-109/source
[INFO] validating manifest of crates.io crate ruly 2.0.0 on toolchain 33fdb797f59421c7bbecaa4588ed5d7a31a9494a
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+33fdb797f59421c7bbecaa4588ed5d7a31a9494a" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking crates.io crate ruly 2.0.0
[INFO] finished tweaking crates.io crate ruly 2.0.0
[INFO] tweaked toml for crates.io crate ruly 2.0.0 written to /workspace/builds/worker-109/source/Cargo.toml
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+33fdb797f59421c7bbecaa4588ed5d7a31a9494a" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+33fdb797f59421c7bbecaa4588ed5d7a31a9494a" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-109/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-109/source:/opt/rustwide/workdir:ro,Z" "-v" "/var/lib/crater-agent-workspace/cargo-home:/opt/rustwide/cargo-home:ro,Z" "-v" "/var/lib/crater-agent-workspace/rustup-home:/opt/rustwide/rustup-home:ro,Z" "-e" "SOURCE_DIR=/opt/rustwide/workdir" "-e" "CARGO_TARGET_DIR=/opt/rustwide/target" "-e" "CARGO_HOME=/opt/rustwide/cargo-home" "-e" "RUSTUP_HOME=/opt/rustwide/rustup-home" "-w" "/opt/rustwide/workdir" "-m" "1610612736" "--user" "0:0" "--network" "none" "ghcr.io/rust-lang/crates-build-env/linux@sha256:34b6a614d2c27851fe6cbf88fbd1137609cefab8b10d0615aaeb6fd47975d74e" "/opt/rustwide/cargo-home/bin/cargo" "+33fdb797f59421c7bbecaa4588ed5d7a31a9494a" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] fab4b3e562079df7d959fef50b2c7320d6d5529a36f1dc20b2b5bbe4a836fa40
[INFO] running `Command { std: "docker" "start" "-a" "fab4b3e562079df7d959fef50b2c7320d6d5529a36f1dc20b2b5bbe4a836fa40", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "fab4b3e562079df7d959fef50b2c7320d6d5529a36f1dc20b2b5bbe4a836fa40", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "fab4b3e562079df7d959fef50b2c7320d6d5529a36f1dc20b2b5bbe4a836fa40", kill_on_drop: false }`
[INFO] [stdout] fab4b3e562079df7d959fef50b2c7320d6d5529a36f1dc20b2b5bbe4a836fa40
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-109/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-109/source:/opt/rustwide/workdir:ro,Z" "-v" "/var/lib/crater-agent-workspace/cargo-home:/opt/rustwide/cargo-home:ro,Z" "-v" "/var/lib/crater-agent-workspace/rustup-home:/opt/rustwide/rustup-home:ro,Z" "-e" "SOURCE_DIR=/opt/rustwide/workdir" "-e" "CARGO_TARGET_DIR=/opt/rustwide/target" "-e" "CARGO_INCREMENTAL=0" "-e" "RUST_BACKTRACE=full" "-e" "RUSTFLAGS=--cap-lints=forbid" "-e" "CARGO_HOME=/opt/rustwide/cargo-home" "-e" "RUSTUP_HOME=/opt/rustwide/rustup-home" "-w" "/opt/rustwide/workdir" "-m" "1610612736" "--user" "0:0" "--network" "none" "ghcr.io/rust-lang/crates-build-env/linux@sha256:34b6a614d2c27851fe6cbf88fbd1137609cefab8b10d0615aaeb6fd47975d74e" "/opt/rustwide/cargo-home/bin/cargo" "+33fdb797f59421c7bbecaa4588ed5d7a31a9494a" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 58c2e0663cf7d03df85ca4c549aedeb2e311011ab501b795aad6e964b5b8d960
[INFO] running `Command { std: "docker" "start" "-a" "58c2e0663cf7d03df85ca4c549aedeb2e311011ab501b795aad6e964b5b8d960", kill_on_drop: false }`
[INFO] [stderr]    Compiling memchr v2.4.1
[INFO] [stderr]     Checking regex-syntax v0.6.25
[INFO] [stderr]    Compiling pmacro_ruly v0.2.0
[INFO] [stderr]     Checking aho-corasick v0.7.18
[INFO] [stderr]     Checking regex v1.5.4
[INFO] [stderr]     Checking ruly v2.0.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: unused imports: `create_enum`, `create_match`
[INFO] [stdout]  --> src/lib.rs:1:19
[INFO] [stdout]   |
[INFO] [stdout] 1 | use pmacro_ruly::{create_enum, create_match};
[INFO] [stdout]   |                   ^^^^^^^^^^^  ^^^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: constant is never used: `ReservedWords`
[INFO] [stdout]    --> src/lib.rs:163:9
[INFO] [stdout]     |
[INFO] [stdout] 163 |         const ReservedWords: [&str; 0 $(  + { $e ; 1 } )* ] = [ $( $e ),* ];
[INFO] [stdout]     |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 266 | reserved_words!();
[INFO] [stdout]     | ------------------ in this macro invocation
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(dead_code)]` on by default
[INFO] [stdout]     = note: this warning originates in the macro `reserved_words` (in Nightly builds, run with -Z macro-backtrace for more info)
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: constant `ReservedWords` should have an upper case name
[INFO] [stdout]    --> src/lib.rs:163:15
[INFO] [stdout]     |
[INFO] [stdout] 163 |         const ReservedWords: [&str; 0 $(  + { $e ; 1 } )* ] = [ $( $e ),* ];
[INFO] [stdout]     |               ^^^^^^^^^^^^^ help: convert the identifier to upper case: `RESERVED_WORDS`
[INFO] [stdout] ...
[INFO] [stdout] 266 | reserved_words!();
[INFO] [stdout]     | ------------------ in this macro invocation
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(non_upper_case_globals)]` on by default
[INFO] [stdout]     = note: this warning originates in the macro `reserved_words` (in Nightly builds, run with -Z macro-backtrace for more info)
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 3 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: constant `ReservedWords` should have an upper case name
[INFO] [stdout]    --> src/lib.rs:163:15
[INFO] [stdout]     |
[INFO] [stdout] 163 |         const ReservedWords: [&str; 0 $(  + { $e ; 1 } )* ] = [ $( $e ),* ];
[INFO] [stdout]     |               ^^^^^^^^^^^^^ help: convert the identifier to upper case: `RESERVED_WORDS`
[INFO] [stdout] ...
[INFO] [stdout] 266 | reserved_words!();
[INFO] [stdout]     | ------------------ in this macro invocation
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(non_upper_case_globals)]` on by default
[INFO] [stdout]     = note: this warning originates in the macro `reserved_words` (in Nightly builds, run with -Z macro-backtrace for more info)
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `Result` that must be used
[INFO] [stdout]    --> src/lib.rs:270:5
[INFO] [stdout]     |
[INFO] [stdout] 270 | /     add_rule!(
[INFO] [stdout] 271 | |         Nat => Zero ({("Z")})
[INFO] [stdout] 272 | |             |   Succ ({("S")},{(r"\(")},Nat,{(r"\)")})
[INFO] [stdout] 273 | |     );
[INFO] [stdout]     | |______^
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unused_must_use)]` on by default
[INFO] [stdout]     = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stdout]     = note: this warning originates in the macro `write` (in Nightly builds, run with -Z macro-backtrace for more info)
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `Result` that must be used
[INFO] [stdout]    --> src/lib.rs:270:5
[INFO] [stdout]     |
[INFO] [stdout] 270 | /     add_rule!(
[INFO] [stdout] 271 | |         Nat => Zero ({("Z")})
[INFO] [stdout] 272 | |             |   Succ ({("S")},{(r"\(")},Nat,{(r"\)")})
[INFO] [stdout] 273 | |     );
[INFO] [stdout]     | |______^
[INFO] [stdout]     |
[INFO] [stdout]     = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stdout]     = note: this warning originates in the macro `write` (in Nightly builds, run with -Z macro-backtrace for more info)
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `Result` that must be used
[INFO] [stdout]    --> src/lib.rs:270:5
[INFO] [stdout]     |
[INFO] [stdout] 270 | /     add_rule!(
[INFO] [stdout] 271 | |         Nat => Zero ({("Z")})
[INFO] [stdout] 272 | |             |   Succ ({("S")},{(r"\(")},Nat,{(r"\)")})
[INFO] [stdout] 273 | |     );
[INFO] [stdout]     | |______^
[INFO] [stdout]     |
[INFO] [stdout]     = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stdout]     = note: this warning originates in the macro `write` (in Nightly builds, run with -Z macro-backtrace for more info)
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `Result` that must be used
[INFO] [stdout]    --> src/lib.rs:270:5
[INFO] [stdout]     |
[INFO] [stdout] 270 | /     add_rule!(
[INFO] [stdout] 271 | |         Nat => Zero ({("Z")})
[INFO] [stdout] 272 | |             |   Succ ({("S")},{(r"\(")},Nat,{(r"\)")})
[INFO] [stdout] 273 | |     );
[INFO] [stdout]     | |______^
[INFO] [stdout]     |
[INFO] [stdout]     = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stdout]     = note: this warning originates in the macro `write` (in Nightly builds, run with -Z macro-backtrace for more info)
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `Result` that must be used
[INFO] [stdout]    --> src/lib.rs:270:5
[INFO] [stdout]     |
[INFO] [stdout] 270 | /     add_rule!(
[INFO] [stdout] 271 | |         Nat => Zero ({("Z")})
[INFO] [stdout] 272 | |             |   Succ ({("S")},{(r"\(")},Nat,{(r"\)")})
[INFO] [stdout] 273 | |     );
[INFO] [stdout]     | |______^
[INFO] [stdout]     |
[INFO] [stdout]     = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stdout]     = note: this warning originates in the macro `write` (in Nightly builds, run with -Z macro-backtrace for more info)
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `Result` that must be used
[INFO] [stdout]    --> src/lib.rs:270:5
[INFO] [stdout]     |
[INFO] [stdout] 270 | /     add_rule!(
[INFO] [stdout] 271 | |         Nat => Zero ({("Z")})
[INFO] [stdout] 272 | |             |   Succ ({("S")},{(r"\(")},Nat,{(r"\)")})
[INFO] [stdout] 273 | |     );
[INFO] [stdout]     | |______^
[INFO] [stdout]     |
[INFO] [stdout]     = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stdout]     = note: this warning originates in the macro `write` (in Nightly builds, run with -Z macro-backtrace for more info)
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `Result` that must be used
[INFO] [stdout]    --> src/lib.rs:270:5
[INFO] [stdout]     |
[INFO] [stdout] 270 | /     add_rule!(
[INFO] [stdout] 271 | |         Nat => Zero ({("Z")})
[INFO] [stdout] 272 | |             |   Succ ({("S")},{(r"\(")},Nat,{(r"\)")})
[INFO] [stdout] 273 | |     );
[INFO] [stdout]     | |______^
[INFO] [stdout]     |
[INFO] [stdout]     = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stdout]     = note: this warning originates in the macro `write` (in Nightly builds, run with -Z macro-backtrace for more info)
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `Result` that must be used
[INFO] [stdout]    --> src/lib.rs:270:5
[INFO] [stdout]     |
[INFO] [stdout] 270 | /     add_rule!(
[INFO] [stdout] 271 | |         Nat => Zero ({("Z")})
[INFO] [stdout] 272 | |             |   Succ ({("S")},{(r"\(")},Nat,{(r"\)")})
[INFO] [stdout] 273 | |     );
[INFO] [stdout]     | |______^
[INFO] [stdout]     |
[INFO] [stdout]     = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stdout]     = note: this warning originates in the macro `write` (in Nightly builds, run with -Z macro-backtrace for more info)
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `Result` that must be used
[INFO] [stdout]    --> src/lib.rs:275:5
[INFO] [stdout]     |
[INFO] [stdout] 275 | /     add_rule!(
[INFO] [stdout] 276 | |         Judgement => Plus (Nat, {("plus")}, Nat, {("is")}, Nat)
[INFO] [stdout] 277 | |             |   Times (Nat, {("times")}, Nat, {("is")}, Nat)
[INFO] [stdout] 278 | |     );
[INFO] [stdout]     | |______^
[INFO] [stdout]     |
[INFO] [stdout]     = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stdout]     = note: this warning originates in the macro `write` (in Nightly builds, run with -Z macro-backtrace for more info)
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `Result` that must be used
[INFO] [stdout]    --> src/lib.rs:275:5
[INFO] [stdout]     |
[INFO] [stdout] 275 | /     add_rule!(
[INFO] [stdout] 276 | |         Judgement => Plus (Nat, {("plus")}, Nat, {("is")}, Nat)
[INFO] [stdout] 277 | |             |   Times (Nat, {("times")}, Nat, {("is")}, Nat)
[INFO] [stdout] 278 | |     );
[INFO] [stdout]     | |______^
[INFO] [stdout]     |
[INFO] [stdout]     = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stdout]     = note: this warning originates in the macro `write` (in Nightly builds, run with -Z macro-backtrace for more info)
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `Result` that must be used
[INFO] [stdout]    --> src/lib.rs:275:5
[INFO] [stdout]     |
[INFO] [stdout] 275 | /     add_rule!(
[INFO] [stdout] 276 | |         Judgement => Plus (Nat, {("plus")}, Nat, {("is")}, Nat)
[INFO] [stdout] 277 | |             |   Times (Nat, {("times")}, Nat, {("is")}, Nat)
[INFO] [stdout] 278 | |     );
[INFO] [stdout]     | |______^
[INFO] [stdout]     |
[INFO] [stdout]     = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stdout]     = note: this warning originates in the macro `write` (in Nightly builds, run with -Z macro-backtrace for more info)
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `Result` that must be used
[INFO] [stdout]    --> src/lib.rs:275:5
[INFO] [stdout]     |
[INFO] [stdout] 275 | /     add_rule!(
[INFO] [stdout] 276 | |         Judgement => Plus (Nat, {("plus")}, Nat, {("is")}, Nat)
[INFO] [stdout] 277 | |             |   Times (Nat, {("times")}, Nat, {("is")}, Nat)
[INFO] [stdout] 278 | |     );
[INFO] [stdout]     | |______^
[INFO] [stdout]     |
[INFO] [stdout]     = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stdout]     = note: this warning originates in the macro `write` (in Nightly builds, run with -Z macro-backtrace for more info)
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `Result` that must be used
[INFO] [stdout]    --> src/lib.rs:275:5
[INFO] [stdout]     |
[INFO] [stdout] 275 | /     add_rule!(
[INFO] [stdout] 276 | |         Judgement => Plus (Nat, {("plus")}, Nat, {("is")}, Nat)
[INFO] [stdout] 277 | |             |   Times (Nat, {("times")}, Nat, {("is")}, Nat)
[INFO] [stdout] 278 | |     );
[INFO] [stdout]     | |______^
[INFO] [stdout]     |
[INFO] [stdout]     = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stdout]     = note: this warning originates in the macro `write` (in Nightly builds, run with -Z macro-backtrace for more info)
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `Result` that must be used
[INFO] [stdout]    --> src/lib.rs:275:5
[INFO] [stdout]     |
[INFO] [stdout] 275 | /     add_rule!(
[INFO] [stdout] 276 | |         Judgement => Plus (Nat, {("plus")}, Nat, {("is")}, Nat)
[INFO] [stdout] 277 | |             |   Times (Nat, {("times")}, Nat, {("is")}, Nat)
[INFO] [stdout] 278 | |     );
[INFO] [stdout]     | |______^
[INFO] [stdout]     |
[INFO] [stdout]     = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stdout]     = note: this warning originates in the macro `write` (in Nightly builds, run with -Z macro-backtrace for more info)
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `Result` that must be used
[INFO] [stdout]    --> src/lib.rs:275:5
[INFO] [stdout]     |
[INFO] [stdout] 275 | /     add_rule!(
[INFO] [stdout] 276 | |         Judgement => Plus (Nat, {("plus")}, Nat, {("is")}, Nat)
[INFO] [stdout] 277 | |             |   Times (Nat, {("times")}, Nat, {("is")}, Nat)
[INFO] [stdout] 278 | |     );
[INFO] [stdout]     | |______^
[INFO] [stdout]     |
[INFO] [stdout]     = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stdout]     = note: this warning originates in the macro `write` (in Nightly builds, run with -Z macro-backtrace for more info)
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `Result` that must be used
[INFO] [stdout]    --> src/lib.rs:275:5
[INFO] [stdout]     |
[INFO] [stdout] 275 | /     add_rule!(
[INFO] [stdout] 276 | |         Judgement => Plus (Nat, {("plus")}, Nat, {("is")}, Nat)
[INFO] [stdout] 277 | |             |   Times (Nat, {("times")}, Nat, {("is")}, Nat)
[INFO] [stdout] 278 | |     );
[INFO] [stdout]     | |______^
[INFO] [stdout]     |
[INFO] [stdout]     = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stdout]     = note: this warning originates in the macro `write` (in Nightly builds, run with -Z macro-backtrace for more info)
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `Result` that must be used
[INFO] [stdout]    --> src/lib.rs:275:5
[INFO] [stdout]     |
[INFO] [stdout] 275 | /     add_rule!(
[INFO] [stdout] 276 | |         Judgement => Plus (Nat, {("plus")}, Nat, {("is")}, Nat)
[INFO] [stdout] 277 | |             |   Times (Nat, {("times")}, Nat, {("is")}, Nat)
[INFO] [stdout] 278 | |     );
[INFO] [stdout]     | |______^
[INFO] [stdout]     |
[INFO] [stdout]     = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stdout]     = note: this warning originates in the macro `write` (in Nightly builds, run with -Z macro-backtrace for more info)
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `Result` that must be used
[INFO] [stdout]    --> src/lib.rs:275:5
[INFO] [stdout]     |
[INFO] [stdout] 275 | /     add_rule!(
[INFO] [stdout] 276 | |         Judgement => Plus (Nat, {("plus")}, Nat, {("is")}, Nat)
[INFO] [stdout] 277 | |             |   Times (Nat, {("times")}, Nat, {("is")}, Nat)
[INFO] [stdout] 278 | |     );
[INFO] [stdout]     | |______^
[INFO] [stdout]     |
[INFO] [stdout]     = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stdout]     = note: this warning originates in the macro `write` (in Nightly builds, run with -Z macro-backtrace for more info)
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `Result` that must be used
[INFO] [stdout]    --> src/lib.rs:275:5
[INFO] [stdout]     |
[INFO] [stdout] 275 | /     add_rule!(
[INFO] [stdout] 276 | |         Judgement => Plus (Nat, {("plus")}, Nat, {("is")}, Nat)
[INFO] [stdout] 277 | |             |   Times (Nat, {("times")}, Nat, {("is")}, Nat)
[INFO] [stdout] 278 | |     );
[INFO] [stdout]     | |______^
[INFO] [stdout]     |
[INFO] [stdout]     = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stdout]     = note: this warning originates in the macro `write` (in Nightly builds, run with -Z macro-backtrace for more info)
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `Result` that must be used
[INFO] [stdout]    --> src/lib.rs:275:5
[INFO] [stdout]     |
[INFO] [stdout] 275 | /     add_rule!(
[INFO] [stdout] 276 | |         Judgement => Plus (Nat, {("plus")}, Nat, {("is")}, Nat)
[INFO] [stdout] 277 | |             |   Times (Nat, {("times")}, Nat, {("is")}, Nat)
[INFO] [stdout] 278 | |     );
[INFO] [stdout]     | |______^
[INFO] [stdout]     |
[INFO] [stdout]     = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stdout]     = note: this warning originates in the macro `write` (in Nightly builds, run with -Z macro-backtrace for more info)
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `Result` that must be used
[INFO] [stdout]    --> src/lib.rs:275:5
[INFO] [stdout]     |
[INFO] [stdout] 275 | /     add_rule!(
[INFO] [stdout] 276 | |         Judgement => Plus (Nat, {("plus")}, Nat, {("is")}, Nat)
[INFO] [stdout] 277 | |             |   Times (Nat, {("times")}, Nat, {("is")}, Nat)
[INFO] [stdout] 278 | |     );
[INFO] [stdout]     | |______^
[INFO] [stdout]     |
[INFO] [stdout]     = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stdout]     = note: this warning originates in the macro `write` (in Nightly builds, run with -Z macro-backtrace for more info)
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `Result` that must be used
[INFO] [stdout]    --> src/lib.rs:275:5
[INFO] [stdout]     |
[INFO] [stdout] 275 | /     add_rule!(
[INFO] [stdout] 276 | |         Judgement => Plus (Nat, {("plus")}, Nat, {("is")}, Nat)
[INFO] [stdout] 277 | |             |   Times (Nat, {("times")}, Nat, {("is")}, Nat)
[INFO] [stdout] 278 | |     );
[INFO] [stdout]     | |______^
[INFO] [stdout]     |
[INFO] [stdout]     = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stdout]     = note: this warning originates in the macro `write` (in Nightly builds, run with -Z macro-backtrace for more info)
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `Result` that must be used
[INFO] [stdout]    --> src/lib.rs:275:5
[INFO] [stdout]     |
[INFO] [stdout] 275 | /     add_rule!(
[INFO] [stdout] 276 | |         Judgement => Plus (Nat, {("plus")}, Nat, {("is")}, Nat)
[INFO] [stdout] 277 | |             |   Times (Nat, {("times")}, Nat, {("is")}, Nat)
[INFO] [stdout] 278 | |     );
[INFO] [stdout]     | |______^
[INFO] [stdout]     |
[INFO] [stdout]     = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stdout]     = note: this warning originates in the macro `write` (in Nightly builds, run with -Z macro-backtrace for more info)
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `Result` that must be used
[INFO] [stdout]    --> src/lib.rs:275:5
[INFO] [stdout]     |
[INFO] [stdout] 275 | /     add_rule!(
[INFO] [stdout] 276 | |         Judgement => Plus (Nat, {("plus")}, Nat, {("is")}, Nat)
[INFO] [stdout] 277 | |             |   Times (Nat, {("times")}, Nat, {("is")}, Nat)
[INFO] [stdout] 278 | |     );
[INFO] [stdout]     | |______^
[INFO] [stdout]     |
[INFO] [stdout]     = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stdout]     = note: this warning originates in the macro `write` (in Nightly builds, run with -Z macro-backtrace for more info)
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `Result` that must be used
[INFO] [stdout]    --> src/lib.rs:275:5
[INFO] [stdout]     |
[INFO] [stdout] 275 | /     add_rule!(
[INFO] [stdout] 276 | |         Judgement => Plus (Nat, {("plus")}, Nat, {("is")}, Nat)
[INFO] [stdout] 277 | |             |   Times (Nat, {("times")}, Nat, {("is")}, Nat)
[INFO] [stdout] 278 | |     );
[INFO] [stdout]     | |______^
[INFO] [stdout]     |
[INFO] [stdout]     = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stdout]     = note: this warning originates in the macro `write` (in Nightly builds, run with -Z macro-backtrace for more info)
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `Result` that must be used
[INFO] [stdout]    --> src/lib.rs:275:5
[INFO] [stdout]     |
[INFO] [stdout] 275 | /     add_rule!(
[INFO] [stdout] 276 | |         Judgement => Plus (Nat, {("plus")}, Nat, {("is")}, Nat)
[INFO] [stdout] 277 | |             |   Times (Nat, {("times")}, Nat, {("is")}, Nat)
[INFO] [stdout] 278 | |     );
[INFO] [stdout]     | |______^
[INFO] [stdout]     |
[INFO] [stdout]     = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stdout]     = note: this warning originates in the macro `write` (in Nightly builds, run with -Z macro-backtrace for more info)
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 27 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 4.34s
[INFO] running `Command { std: "docker" "inspect" "58c2e0663cf7d03df85ca4c549aedeb2e311011ab501b795aad6e964b5b8d960", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "58c2e0663cf7d03df85ca4c549aedeb2e311011ab501b795aad6e964b5b8d960", kill_on_drop: false }`
[INFO] [stdout] 58c2e0663cf7d03df85ca4c549aedeb2e311011ab501b795aad6e964b5b8d960