[INFO] cloning repository https://github.com/Lapz/undisclosed
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/Lapz/undisclosed" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FLapz%2Fundisclosed", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FLapz%2Fundisclosed'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] cc2efbcffb4d63245c74338ea9b314881df18d92
[INFO] checking Lapz/undisclosed/cc2efbcffb4d63245c74338ea9b314881df18d92 against master#ab869e094a907cc5d19b4080f22eccaf347f1f95 for pr-129604
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FLapz%2Fundisclosed" "/workspace/builds/worker-0-tc1/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-0-tc1/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/Lapz/undisclosed on toolchain ab869e094a907cc5d19b4080f22eccaf347f1f95
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+ab869e094a907cc5d19b4080f22eccaf347f1f95" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/Lapz/undisclosed
[INFO] finished tweaking git repo https://github.com/Lapz/undisclosed
[INFO] tweaked toml for git repo https://github.com/Lapz/undisclosed written to /workspace/builds/worker-0-tc1/source/Cargo.toml
[INFO] crate git repo https://github.com/Lapz/undisclosed already has a lockfile, it will not be regenerated
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+ab869e094a907cc5d19b4080f22eccaf347f1f95" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr] warning: /workspace/builds/worker-0-tc1/source/underscore_util/Cargo.toml: no edition set: defaulting to the 2015 edition while the latest is 2021
[INFO] [stderr] warning: /workspace/builds/worker-0-tc1/source/underscore_syntax/Cargo.toml: no edition set: defaulting to the 2015 edition while the latest is 2021
[INFO] [stderr] warning: /workspace/builds/worker-0-tc1/source/underscore_vm/Cargo.toml: no edition set: defaulting to the 2015 edition while the latest is 2021
[INFO] [stderr] warning: /workspace/builds/worker-0-tc1/source/underscore/Cargo.toml: no edition set: defaulting to the 2015 edition while the latest is 2021
[INFO] [stderr] warning: /workspace/builds/worker-0-tc1/source/underscore_ir/Cargo.toml: no edition set: defaulting to the 2015 edition while the latest is 2021
[INFO] [stderr] warning: /workspace/builds/worker-0-tc1/source/underscore_semant/Cargo.toml: no edition set: defaulting to the 2015 edition while the latest is 2021
[INFO] [stderr] warning: /workspace/builds/worker-0-tc1/source/underscore_x86/Cargo.toml: no edition set: defaulting to the 2015 edition while the latest is 2021
[INFO] [stderr]  Downloading crates ...
[INFO] [stderr]   Downloaded walkdir v2.1.3
[INFO] [stderr]   Downloaded ansi_term v0.10.2
[INFO] [stderr]   Downloaded structopt v0.1.7
[INFO] [stderr]   Downloaded structopt-derive v0.1.6
[INFO] [stderr]   Downloaded same-file v1.0.2
[INFO] [stderr]   Downloaded rand_core v0.1.0-pre.0
[INFO] [stderr]   Downloaded rand v0.5.0-pre.0
[INFO] [stderr]   Downloaded libc v0.2.36
[INFO] [stderr]   Downloaded clap v2.30.0
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-0-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-0-tc1/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@sha256:923055f121b5182466d55868a8b05e67af8ba4a3a3f6bad814e953ca3cd3ac2a" "/opt/rustwide/cargo-home/bin/cargo" "+ab869e094a907cc5d19b4080f22eccaf347f1f95" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] d5f5ac9a3fcb6ae02f6aadd968b7b202f5fa308fdde7277ccb9ded39b3aa59fa
[INFO] running `Command { std: "docker" "start" "-a" "d5f5ac9a3fcb6ae02f6aadd968b7b202f5fa308fdde7277ccb9ded39b3aa59fa", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "d5f5ac9a3fcb6ae02f6aadd968b7b202f5fa308fdde7277ccb9ded39b3aa59fa", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "d5f5ac9a3fcb6ae02f6aadd968b7b202f5fa308fdde7277ccb9ded39b3aa59fa", kill_on_drop: false }`
[INFO] [stdout] d5f5ac9a3fcb6ae02f6aadd968b7b202f5fa308fdde7277ccb9ded39b3aa59fa
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-0-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-0-tc1/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" "RUSTDOCFLAGS=--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@sha256:923055f121b5182466d55868a8b05e67af8ba4a3a3f6bad814e953ca3cd3ac2a" "/opt/rustwide/cargo-home/bin/cargo" "+ab869e094a907cc5d19b4080f22eccaf347f1f95" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] e2c537d32068a6b4a36a659298109ad7085c9d7fec11b8e348a55606a6d6aaa0
[INFO] running `Command { std: "docker" "start" "-a" "e2c537d32068a6b4a36a659298109ad7085c9d7fec11b8e348a55606a6d6aaa0", kill_on_drop: false }`
[INFO] [stderr] warning: /opt/rustwide/workdir/underscore_semant/Cargo.toml: no edition set: defaulting to the 2015 edition while the latest is 2021
[INFO] [stderr] warning: /opt/rustwide/workdir/underscore_util/Cargo.toml: no edition set: defaulting to the 2015 edition while the latest is 2021
[INFO] [stderr] warning: /opt/rustwide/workdir/underscore_x86/Cargo.toml: no edition set: defaulting to the 2015 edition while the latest is 2021
[INFO] [stderr] warning: /opt/rustwide/workdir/underscore_vm/Cargo.toml: no edition set: defaulting to the 2015 edition while the latest is 2021
[INFO] [stderr] warning: /opt/rustwide/workdir/underscore/Cargo.toml: no edition set: defaulting to the 2015 edition while the latest is 2021
[INFO] [stderr] warning: /opt/rustwide/workdir/underscore_syntax/Cargo.toml: no edition set: defaulting to the 2015 edition while the latest is 2021
[INFO] [stderr] warning: /opt/rustwide/workdir/underscore_ir/Cargo.toml: no edition set: defaulting to the 2015 edition while the latest is 2021
[INFO] [stderr]     Checking libc v0.2.36
[INFO] [stderr]     Checking ansi_term v0.10.2
[INFO] [stderr]     Checking rand_core v0.1.0-pre.0
[INFO] [stderr]    Compiling unicode-xid v0.0.4
[INFO] [stderr]     Checking unicode-width v0.1.4
[INFO] [stderr]     Checking strsim v0.7.0
[INFO] [stderr]    Compiling quote v0.3.15
[INFO] [stderr]     Checking bitflags v1.0.1
[INFO] [stderr]     Checking vec_map v0.8.0
[INFO] [stderr]     Checking same-file v1.0.2
[INFO] [stderr]     Checking underscore_vm v0.1.0 (/opt/rustwide/workdir/underscore_vm)
[INFO] [stdout] warning: anonymous parameters are deprecated and will be removed in the next edition
[INFO] [stdout]   --> underscore_vm/src/op.rs:34:17
[INFO] [stdout]    |
[INFO] [stdout] 34 |     fn try_from(T) -> Result<Self, Self::Error>;
[INFO] [stdout]    |                 ^ help: try naming the parameter or explicitly ignoring it: `_: T`
[INFO] [stdout]    |
[INFO] [stdout]    = warning: this is accepted in the current edition (Rust 2015) but is a hard error in Rust 2018!
[INFO] [stdout]    = note: for more information, see issue #41686 <https://github.com/rust-lang/rust/issues/41686>
[INFO] [stdout]    = note: `#[warn(anonymous_parameters)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Checking textwrap v0.9.0
[INFO] [stdout] warning: anonymous parameters are deprecated and will be removed in the next edition
[INFO] [stdout]   --> underscore_vm/src/op.rs:34:17
[INFO] [stdout]    |
[INFO] [stdout] 34 |     fn try_from(T) -> Result<Self, Self::Error>;
[INFO] [stdout]    |                 ^ help: try naming the parameter or explicitly ignoring it: `_: T`
[INFO] [stdout]    |
[INFO] [stdout]    = warning: this is accepted in the current edition (Rust 2015) but is a hard error in Rust 2018!
[INFO] [stdout]    = note: for more information, see issue #41686 <https://github.com/rust-lang/rust/issues/41686>
[INFO] [stdout]    = note: `#[warn(anonymous_parameters)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]    Compiling synom v0.11.3
[INFO] [stderr]     Checking walkdir v2.1.3
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]    --> underscore_vm/src/vm.rs:29:13
[INFO] [stdout]     |
[INFO] [stdout] 29  |         let mut b = &mut$stack[$from..($from + $to)];
[INFO] [stdout]     |             ----^
[INFO] [stdout]     |             |
[INFO] [stdout]     |             help: remove this `mut`
[INFO] [stdout] ...
[INFO] [stdout] 142 |                     push!(&self.code.constants[index..index+1] => self.stack,[self.stack_top,1]);
[INFO] [stdout]     |                     ---------------------------------------------------------------------------- in this macro invocation
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unused_mut)]` on by default
[INFO] [stdout]     = note: this warning originates in the macro `push` (in Nightly builds, run with -Z macro-backtrace for more info)
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]    --> underscore_vm/src/vm.rs:29:13
[INFO] [stdout]     |
[INFO] [stdout] 29  |         let mut b = &mut$stack[$from..($from + $to)];
[INFO] [stdout]     |             ----^
[INFO] [stdout]     |             |
[INFO] [stdout]     |             help: remove this `mut`
[INFO] [stdout] ...
[INFO] [stdout] 152 |                     push!(&self.code.constants[index..index+4] => self.stack,[self.stack_top,4]);
[INFO] [stdout]     |                     ---------------------------------------------------------------------------- in this macro invocation
[INFO] [stdout]     |
[INFO] [stdout]     = note: this warning originates in the macro `push` (in Nightly builds, run with -Z macro-backtrace for more info)
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]    --> underscore_vm/src/vm.rs:29:13
[INFO] [stdout]     |
[INFO] [stdout] 29  |         let mut b = &mut$stack[$from..($from + $to)];
[INFO] [stdout]     |             ----^
[INFO] [stdout]     |             |
[INFO] [stdout]     |             help: remove this `mut`
[INFO] [stdout] ...
[INFO] [stdout] 162 |                     push!(&self.code.constants[index..index+8] => self.stack,[self.stack_top,8]);
[INFO] [stdout]     |                     ---------------------------------------------------------------------------- in this macro invocation
[INFO] [stdout]     |
[INFO] [stdout]     = note: this warning originates in the macro `push` (in Nightly builds, run with -Z macro-backtrace for more info)
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]    --> underscore_vm/src/vm.rs:29:13
[INFO] [stdout]     |
[INFO] [stdout] 29  |         let mut b = &mut$stack[$from..($from + $to)];
[INFO] [stdout]     |             ----^
[INFO] [stdout]     |             |
[INFO] [stdout]     |             help: remove this `mut`
[INFO] [stdout] ...
[INFO] [stdout] 177 |                             push!( &to_bytes!(-a => i8)     => self.stack,[self.stack_top,size]);
[INFO] [stdout]     |                             -------------------------------------------------------------------- in this macro invocation
[INFO] [stdout]     |
[INFO] [stdout]     = note: this warning originates in the macro `push` (in Nightly builds, run with -Z macro-backtrace for more info)
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]    --> underscore_vm/src/vm.rs:29:13
[INFO] [stdout]     |
[INFO] [stdout] 29  |         let mut b = &mut$stack[$from..($from + $to)];
[INFO] [stdout]     |             ----^
[INFO] [stdout]     |             |
[INFO] [stdout]     |             help: remove this `mut`
[INFO] [stdout] ...
[INFO] [stdout] 182 |                             push!( &to_bytes!(-a => i32)     => self.stack,[self.stack_top,size]);
[INFO] [stdout]     |                             --------------------------------------------------------------------- in this macro invocation
[INFO] [stdout]     |
[INFO] [stdout]     = note: this warning originates in the macro `push` (in Nightly builds, run with -Z macro-backtrace for more info)
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]    --> underscore_vm/src/vm.rs:29:13
[INFO] [stdout]     |
[INFO] [stdout] 29  |         let mut b = &mut$stack[$from..($from + $to)];
[INFO] [stdout]     |             ----^
[INFO] [stdout]     |             |
[INFO] [stdout]     |             help: remove this `mut`
[INFO] [stdout] ...
[INFO] [stdout] 187 |                             push!( &to_bytes!(-a => i64)     => self.stack,[self.stack_top,size]);
[INFO] [stdout]     |                             --------------------------------------------------------------------- in this macro invocation
[INFO] [stdout]     |
[INFO] [stdout]     = note: this warning originates in the macro `push` (in Nightly builds, run with -Z macro-backtrace for more info)
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]    --> underscore_vm/src/vm.rs:29:13
[INFO] [stdout]     |
[INFO] [stdout] 29  |         let mut b = &mut$stack[$from..($from + $to)];
[INFO] [stdout]     |             ----^
[INFO] [stdout]     |             |
[INFO] [stdout]     |             help: remove this `mut`
[INFO] [stdout] ...
[INFO] [stdout] 193 |                 Ok(OpCode::Add) => binary_op!(+,self),
[INFO] [stdout]     |                                    ------------------ in this macro invocation
[INFO] [stdout]     |
[INFO] [stdout]     = note: this warning originates in the macro `push` which comes from the expansion of the macro `binary_op` (in Nightly builds, run with -Z macro-backtrace for more info)
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]    --> underscore_vm/src/vm.rs:29:13
[INFO] [stdout]     |
[INFO] [stdout] 29  |         let mut b = &mut$stack[$from..($from + $to)];
[INFO] [stdout]     |             ----^
[INFO] [stdout]     |             |
[INFO] [stdout]     |             help: remove this `mut`
[INFO] [stdout] ...
[INFO] [stdout] 193 |                 Ok(OpCode::Add) => binary_op!(+,self),
[INFO] [stdout]     |                                    ------------------ in this macro invocation
[INFO] [stdout]     |
[INFO] [stdout]     = note: this warning originates in the macro `push` which comes from the expansion of the macro `binary_op` (in Nightly builds, run with -Z macro-backtrace for more info)
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]    --> underscore_vm/src/vm.rs:29:13
[INFO] [stdout]     |
[INFO] [stdout] 29  |         let mut b = &mut$stack[$from..($from + $to)];
[INFO] [stdout]     |             ----^
[INFO] [stdout]     |             |
[INFO] [stdout]     |             help: remove this `mut`
[INFO] [stdout] ...
[INFO] [stdout] 193 |                 Ok(OpCode::Add) => binary_op!(+,self),
[INFO] [stdout]     |                                    ------------------ in this macro invocation
[INFO] [stdout]     |
[INFO] [stdout]     = note: this warning originates in the macro `push` which comes from the expansion of the macro `binary_op` (in Nightly builds, run with -Z macro-backtrace for more info)
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]    --> underscore_vm/src/vm.rs:29:13
[INFO] [stdout]     |
[INFO] [stdout] 29  |         let mut b = &mut$stack[$from..($from + $to)];
[INFO] [stdout]     |             ----^
[INFO] [stdout]     |             |
[INFO] [stdout]     |             help: remove this `mut`
[INFO] [stdout] ...
[INFO] [stdout] 194 |                 Ok(OpCode::Divide) => binary_op!(/,self),
[INFO] [stdout]     |                                       ------------------ in this macro invocation
[INFO] [stdout]     |
[INFO] [stdout]     = note: this warning originates in the macro `push` which comes from the expansion of the macro `binary_op` (in Nightly builds, run with -Z macro-backtrace for more info)
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]    --> underscore_vm/src/vm.rs:29:13
[INFO] [stdout]     |
[INFO] [stdout] 29  |         let mut b = &mut$stack[$from..($from + $to)];
[INFO] [stdout]     |             ----^
[INFO] [stdout]     |             |
[INFO] [stdout]     |             help: remove this `mut`
[INFO] [stdout] ...
[INFO] [stdout] 194 |                 Ok(OpCode::Divide) => binary_op!(/,self),
[INFO] [stdout]     |                                       ------------------ in this macro invocation
[INFO] [stdout]     |
[INFO] [stdout]     = note: this warning originates in the macro `push` which comes from the expansion of the macro `binary_op` (in Nightly builds, run with -Z macro-backtrace for more info)
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]    --> underscore_vm/src/vm.rs:29:13
[INFO] [stdout]     |
[INFO] [stdout] 29  |         let mut b = &mut$stack[$from..($from + $to)];
[INFO] [stdout]     |             ----^
[INFO] [stdout]     |             |
[INFO] [stdout]     |             help: remove this `mut`
[INFO] [stdout] ...
[INFO] [stdout] 194 |                 Ok(OpCode::Divide) => binary_op!(/,self),
[INFO] [stdout]     |                                       ------------------ in this macro invocation
[INFO] [stdout]     |
[INFO] [stdout]     = note: this warning originates in the macro `push` which comes from the expansion of the macro `binary_op` (in Nightly builds, run with -Z macro-backtrace for more info)
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]    --> underscore_vm/src/vm.rs:29:13
[INFO] [stdout]     |
[INFO] [stdout] 29  |         let mut b = &mut$stack[$from..($from + $to)];
[INFO] [stdout]     |             ----^
[INFO] [stdout]     |             |
[INFO] [stdout]     |             help: remove this `mut`
[INFO] [stdout] ...
[INFO] [stdout] 195 |                 Ok(OpCode::Multiply) => binary_op!(*,self),
[INFO] [stdout]     |                                         ------------------ in this macro invocation
[INFO] [stdout]     |
[INFO] [stdout]     = note: this warning originates in the macro `push` which comes from the expansion of the macro `binary_op` (in Nightly builds, run with -Z macro-backtrace for more info)
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]    --> underscore_vm/src/vm.rs:29:13
[INFO] [stdout]     |
[INFO] [stdout] 29  |         let mut b = &mut$stack[$from..($from + $to)];
[INFO] [stdout]     |             ----^
[INFO] [stdout]     |             |
[INFO] [stdout]     |             help: remove this `mut`
[INFO] [stdout] ...
[INFO] [stdout] 195 |                 Ok(OpCode::Multiply) => binary_op!(*,self),
[INFO] [stdout]     |                                         ------------------ in this macro invocation
[INFO] [stdout]     |
[INFO] [stdout]     = note: this warning originates in the macro `push` which comes from the expansion of the macro `binary_op` (in Nightly builds, run with -Z macro-backtrace for more info)
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]    --> underscore_vm/src/vm.rs:29:13
[INFO] [stdout]     |
[INFO] [stdout] 29  |         let mut b = &mut$stack[$from..($from + $to)];
[INFO] [stdout]     |             ----^
[INFO] [stdout]     |             |
[INFO] [stdout]     |             help: remove this `mut`
[INFO] [stdout] ...
[INFO] [stdout] 195 |                 Ok(OpCode::Multiply) => binary_op!(*,self),
[INFO] [stdout]     |                                         ------------------ in this macro invocation
[INFO] [stdout]     |
[INFO] [stdout]     = note: this warning originates in the macro `push` which comes from the expansion of the macro `binary_op` (in Nightly builds, run with -Z macro-backtrace for more info)
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]    --> underscore_vm/src/vm.rs:29:13
[INFO] [stdout]     |
[INFO] [stdout] 29  |         let mut b = &mut$stack[$from..($from + $to)];
[INFO] [stdout]     |             ----^
[INFO] [stdout]     |             |
[INFO] [stdout]     |             help: remove this `mut`
[INFO] [stdout] ...
[INFO] [stdout] 196 |                 Ok(OpCode::Subtract) => binary_op!(-,self),
[INFO] [stdout]     |                                         ------------------ in this macro invocation
[INFO] [stdout]     |
[INFO] [stdout]     = note: this warning originates in the macro `push` which comes from the expansion of the macro `binary_op` (in Nightly builds, run with -Z macro-backtrace for more info)
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]    --> underscore_vm/src/vm.rs:29:13
[INFO] [stdout]     |
[INFO] [stdout] 29  |         let mut b = &mut$stack[$from..($from + $to)];
[INFO] [stdout]     |             ----^
[INFO] [stdout]     |             |
[INFO] [stdout]     |             help: remove this `mut`
[INFO] [stdout] ...
[INFO] [stdout] 196 |                 Ok(OpCode::Subtract) => binary_op!(-,self),
[INFO] [stdout]     |                                         ------------------ in this macro invocation
[INFO] [stdout]     |
[INFO] [stdout]     = note: this warning originates in the macro `push` which comes from the expansion of the macro `binary_op` (in Nightly builds, run with -Z macro-backtrace for more info)
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]    --> underscore_vm/src/vm.rs:29:13
[INFO] [stdout]     |
[INFO] [stdout] 29  |         let mut b = &mut$stack[$from..($from + $to)];
[INFO] [stdout]     |             ----^
[INFO] [stdout]     |             |
[INFO] [stdout]     |             help: remove this `mut`
[INFO] [stdout] ...
[INFO] [stdout] 196 |                 Ok(OpCode::Subtract) => binary_op!(-,self),
[INFO] [stdout]     |                                         ------------------ in this macro invocation
[INFO] [stdout]     |
[INFO] [stdout]     = note: this warning originates in the macro `push` which comes from the expansion of the macro `binary_op` (in Nightly builds, run with -Z macro-backtrace for more info)
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]    --> underscore_vm/src/vm.rs:29:13
[INFO] [stdout]     |
[INFO] [stdout] 29  |         let mut b = &mut$stack[$from..($from + $to)];
[INFO] [stdout]     |             ----^
[INFO] [stdout]     |             |
[INFO] [stdout]     |             help: remove this `mut`
[INFO] [stdout] ...
[INFO] [stdout] 142 |                     push!(&self.code.constants[index..index+1] => self.stack,[self.stack_top,1]);
[INFO] [stdout]     |                     ---------------------------------------------------------------------------- in this macro invocation
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unused_mut)]` on by default
[INFO] [stdout]     = note: this warning originates in the macro `push` (in Nightly builds, run with -Z macro-backtrace for more info)
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]    --> underscore_vm/src/vm.rs:29:13
[INFO] [stdout]     |
[INFO] [stdout] 29  |         let mut b = &mut$stack[$from..($from + $to)];
[INFO] [stdout]     |             ----^
[INFO] [stdout]     |             |
[INFO] [stdout]     |             help: remove this `mut`
[INFO] [stdout] ...
[INFO] [stdout] 152 |                     push!(&self.code.constants[index..index+4] => self.stack,[self.stack_top,4]);
[INFO] [stdout]     |                     ---------------------------------------------------------------------------- in this macro invocation
[INFO] [stdout]     |
[INFO] [stdout]     = note: this warning originates in the macro `push` (in Nightly builds, run with -Z macro-backtrace for more info)
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]    --> underscore_vm/src/vm.rs:29:13
[INFO] [stdout]     |
[INFO] [stdout] 29  |         let mut b = &mut$stack[$from..($from + $to)];
[INFO] [stdout]     |             ----^
[INFO] [stdout]     |             |
[INFO] [stdout]     |             help: remove this `mut`
[INFO] [stdout] ...
[INFO] [stdout] 162 |                     push!(&self.code.constants[index..index+8] => self.stack,[self.stack_top,8]);
[INFO] [stdout]     |                     ---------------------------------------------------------------------------- in this macro invocation
[INFO] [stdout]     |
[INFO] [stdout]     = note: this warning originates in the macro `push` (in Nightly builds, run with -Z macro-backtrace for more info)
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]    --> underscore_vm/src/vm.rs:29:13
[INFO] [stdout]     |
[INFO] [stdout] 29  |         let mut b = &mut$stack[$from..($from + $to)];
[INFO] [stdout]     |             ----^
[INFO] [stdout]     |             |
[INFO] [stdout]     |             help: remove this `mut`
[INFO] [stdout] ...
[INFO] [stdout] 177 |                             push!( &to_bytes!(-a => i8)     => self.stack,[self.stack_top,size]);
[INFO] [stdout]     |                             -------------------------------------------------------------------- in this macro invocation
[INFO] [stdout]     |
[INFO] [stdout]     = note: this warning originates in the macro `push` (in Nightly builds, run with -Z macro-backtrace for more info)
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]    --> underscore_vm/src/vm.rs:29:13
[INFO] [stdout]     |
[INFO] [stdout] 29  |         let mut b = &mut$stack[$from..($from + $to)];
[INFO] [stdout]     |             ----^
[INFO] [stdout]     |             |
[INFO] [stdout]     |             help: remove this `mut`
[INFO] [stdout] ...
[INFO] [stdout] 182 |                             push!( &to_bytes!(-a => i32)     => self.stack,[self.stack_top,size]);
[INFO] [stdout]     |                             --------------------------------------------------------------------- in this macro invocation
[INFO] [stdout]     |
[INFO] [stdout]     = note: this warning originates in the macro `push` (in Nightly builds, run with -Z macro-backtrace for more info)
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]    --> underscore_vm/src/vm.rs:29:13
[INFO] [stdout]     |
[INFO] [stdout] 29  |         let mut b = &mut$stack[$from..($from + $to)];
[INFO] [stdout]     |             ----^
[INFO] [stdout]     |             |
[INFO] [stdout]     |             help: remove this `mut`
[INFO] [stdout] ...
[INFO] [stdout] 187 |                             push!( &to_bytes!(-a => i64)     => self.stack,[self.stack_top,size]);
[INFO] [stdout]     |                             --------------------------------------------------------------------- in this macro invocation
[INFO] [stdout]     |
[INFO] [stdout]     = note: this warning originates in the macro `push` (in Nightly builds, run with -Z macro-backtrace for more info)
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]    --> underscore_vm/src/vm.rs:29:13
[INFO] [stdout]     |
[INFO] [stdout] 29  |         let mut b = &mut$stack[$from..($from + $to)];
[INFO] [stdout]     |             ----^
[INFO] [stdout]     |             |
[INFO] [stdout]     |             help: remove this `mut`
[INFO] [stdout] ...
[INFO] [stdout] 193 |                 Ok(OpCode::Add) => binary_op!(+,self),
[INFO] [stdout]     |                                    ------------------ in this macro invocation
[INFO] [stdout]     |
[INFO] [stdout]     = note: this warning originates in the macro `push` which comes from the expansion of the macro `binary_op` (in Nightly builds, run with -Z macro-backtrace for more info)
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]    --> underscore_vm/src/vm.rs:29:13
[INFO] [stdout]     |
[INFO] [stdout] 29  |         let mut b = &mut$stack[$from..($from + $to)];
[INFO] [stdout]     |             ----^
[INFO] [stdout]     |             |
[INFO] [stdout]     |             help: remove this `mut`
[INFO] [stdout] ...
[INFO] [stdout] 193 |                 Ok(OpCode::Add) => binary_op!(+,self),
[INFO] [stdout]     |                                    ------------------ in this macro invocation
[INFO] [stdout]     |
[INFO] [stdout]     = note: this warning originates in the macro `push` which comes from the expansion of the macro `binary_op` (in Nightly builds, run with -Z macro-backtrace for more info)
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]    --> underscore_vm/src/vm.rs:29:13
[INFO] [stdout]     |
[INFO] [stdout] 29  |         let mut b = &mut$stack[$from..($from + $to)];
[INFO] [stdout]     |             ----^
[INFO] [stdout]     |             |
[INFO] [stdout]     |             help: remove this `mut`
[INFO] [stdout] ...
[INFO] [stdout] 193 |                 Ok(OpCode::Add) => binary_op!(+,self),
[INFO] [stdout]     |                                    ------------------ in this macro invocation
[INFO] [stdout]     |
[INFO] [stdout]     = note: this warning originates in the macro `push` which comes from the expansion of the macro `binary_op` (in Nightly builds, run with -Z macro-backtrace for more info)
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]    --> underscore_vm/src/vm.rs:29:13
[INFO] [stdout]     |
[INFO] [stdout] 29  |         let mut b = &mut$stack[$from..($from + $to)];
[INFO] [stdout]     |             ----^
[INFO] [stdout]     |             |
[INFO] [stdout]     |             help: remove this `mut`
[INFO] [stdout] ...
[INFO] [stdout] 194 |                 Ok(OpCode::Divide) => binary_op!(/,self),
[INFO] [stdout]     |                                       ------------------ in this macro invocation
[INFO] [stdout]     |
[INFO] [stdout]     = note: this warning originates in the macro `push` which comes from the expansion of the macro `binary_op` (in Nightly builds, run with -Z macro-backtrace for more info)
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]    --> underscore_vm/src/vm.rs:29:13
[INFO] [stdout]     |
[INFO] [stdout] 29  |         let mut b = &mut$stack[$from..($from + $to)];
[INFO] [stdout]     |             ----^
[INFO] [stdout]     |             |
[INFO] [stdout]     |             help: remove this `mut`
[INFO] [stdout] ...
[INFO] [stdout] 194 |                 Ok(OpCode::Divide) => binary_op!(/,self),
[INFO] [stdout]     |                                       ------------------ in this macro invocation
[INFO] [stdout]     |
[INFO] [stdout]     = note: this warning originates in the macro `push` which comes from the expansion of the macro `binary_op` (in Nightly builds, run with -Z macro-backtrace for more info)
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]    --> underscore_vm/src/vm.rs:29:13
[INFO] [stdout]     |
[INFO] [stdout] 29  |         let mut b = &mut$stack[$from..($from + $to)];
[INFO] [stdout]     |             ----^
[INFO] [stdout]     |             |
[INFO] [stdout]     |             help: remove this `mut`
[INFO] [stdout] ...
[INFO] [stdout] 194 |                 Ok(OpCode::Divide) => binary_op!(/,self),
[INFO] [stdout]     |                                       ------------------ in this macro invocation
[INFO] [stdout]     |
[INFO] [stdout]     = note: this warning originates in the macro `push` which comes from the expansion of the macro `binary_op` (in Nightly builds, run with -Z macro-backtrace for more info)
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]    --> underscore_vm/src/vm.rs:29:13
[INFO] [stdout]     |
[INFO] [stdout] 29  |         let mut b = &mut$stack[$from..($from + $to)];
[INFO] [stdout]     |             ----^
[INFO] [stdout]     |             |
[INFO] [stdout]     |             help: remove this `mut`
[INFO] [stdout] ...
[INFO] [stdout] 195 |                 Ok(OpCode::Multiply) => binary_op!(*,self),
[INFO] [stdout]     |                                         ------------------ in this macro invocation
[INFO] [stdout]     |
[INFO] [stdout]     = note: this warning originates in the macro `push` which comes from the expansion of the macro `binary_op` (in Nightly builds, run with -Z macro-backtrace for more info)
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]    --> underscore_vm/src/vm.rs:29:13
[INFO] [stdout]     |
[INFO] [stdout] 29  |         let mut b = &mut$stack[$from..($from + $to)];
[INFO] [stdout]     |             ----^
[INFO] [stdout]     |             |
[INFO] [stdout]     |             help: remove this `mut`
[INFO] [stdout] ...
[INFO] [stdout] 195 |                 Ok(OpCode::Multiply) => binary_op!(*,self),
[INFO] [stdout]     |                                         ------------------ in this macro invocation
[INFO] [stdout]     |
[INFO] [stdout]     = note: this warning originates in the macro `push` which comes from the expansion of the macro `binary_op` (in Nightly builds, run with -Z macro-backtrace for more info)
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]    --> underscore_vm/src/vm.rs:29:13
[INFO] [stdout]     |
[INFO] [stdout] 29  |         let mut b = &mut$stack[$from..($from + $to)];
[INFO] [stdout]     |             ----^
[INFO] [stdout]     |             |
[INFO] [stdout]     |             help: remove this `mut`
[INFO] [stdout] ...
[INFO] [stdout] 195 |                 Ok(OpCode::Multiply) => binary_op!(*,self),
[INFO] [stdout]     |                                         ------------------ in this macro invocation
[INFO] [stdout]     |
[INFO] [stdout]     = note: this warning originates in the macro `push` which comes from the expansion of the macro `binary_op` (in Nightly builds, run with -Z macro-backtrace for more info)
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]    --> underscore_vm/src/vm.rs:29:13
[INFO] [stdout]     |
[INFO] [stdout] 29  |         let mut b = &mut$stack[$from..($from + $to)];
[INFO] [stdout]     |             ----^
[INFO] [stdout]     |             |
[INFO] [stdout]     |             help: remove this `mut`
[INFO] [stdout] ...
[INFO] [stdout] 196 |                 Ok(OpCode::Subtract) => binary_op!(-,self),
[INFO] [stdout]     |                                         ------------------ in this macro invocation
[INFO] [stdout]     |
[INFO] [stdout]     = note: this warning originates in the macro `push` which comes from the expansion of the macro `binary_op` (in Nightly builds, run with -Z macro-backtrace for more info)
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]    --> underscore_vm/src/vm.rs:29:13
[INFO] [stdout]     |
[INFO] [stdout] 29  |         let mut b = &mut$stack[$from..($from + $to)];
[INFO] [stdout]     |             ----^
[INFO] [stdout]     |             |
[INFO] [stdout]     |             help: remove this `mut`
[INFO] [stdout] ...
[INFO] [stdout] 196 |                 Ok(OpCode::Subtract) => binary_op!(-,self),
[INFO] [stdout]     |                                         ------------------ in this macro invocation
[INFO] [stdout]     |
[INFO] [stdout]     = note: this warning originates in the macro `push` which comes from the expansion of the macro `binary_op` (in Nightly builds, run with -Z macro-backtrace for more info)
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]    --> underscore_vm/src/vm.rs:29:13
[INFO] [stdout]     |
[INFO] [stdout] 29  |         let mut b = &mut$stack[$from..($from + $to)];
[INFO] [stdout]     |             ----^
[INFO] [stdout]     |             |
[INFO] [stdout]     |             help: remove this `mut`
[INFO] [stdout] ...
[INFO] [stdout] 196 |                 Ok(OpCode::Subtract) => binary_op!(-,self),
[INFO] [stdout]     |                                         ------------------ in this macro invocation
[INFO] [stdout]     |
[INFO] [stdout]     = note: this warning originates in the macro `push` which comes from the expansion of the macro `binary_op` (in Nightly builds, run with -Z macro-backtrace for more info)
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 19 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]    Compiling syn v0.11.11
[INFO] [stdout] warning: 19 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Checking underscore_util v0.1.0 (/opt/rustwide/workdir/underscore_util)
[INFO] [stderr]     Checking rand v0.5.0-pre.0
[INFO] [stderr]     Checking atty v0.2.6
[INFO] [stderr]     Checking clap v2.30.0
[INFO] [stderr]    Compiling structopt-derive v0.1.6
[INFO] [stderr]     Checking underscore_syntax v0.1.0 (/opt/rustwide/workdir/underscore_syntax)
[INFO] [stderr]     Checking underscore_ir v0.1.0 (/opt/rustwide/workdir/underscore_ir)
[INFO] [stderr]     Checking underscore_semant v0.1.0 (/opt/rustwide/workdir/underscore_semant)
[INFO] [stderr]     Checking underscore_x86 v0.1.0 (/opt/rustwide/workdir/underscore_x86)
[INFO] [stdout] warning: unused variable: `escapes`
[INFO] [stdout]    --> underscore_semant/src/infer/function.rs:260:17
[INFO] [stdout]     |
[INFO] [stdout] 260 |                 ref escapes,
[INFO] [stdout]     |                 ^^^^^^^^^^^ help: try ignoring the field: `escapes: _`
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]   --> underscore_semant/src/infer/types.rs:60:21
[INFO] [stdout]    |
[INFO] [stdout] 60 |                 let mut ty = if let Some(ty) = env.look_type(ident.value).cloned() {
[INFO] [stdout]    |                     ----^^
[INFO] [stdout]    |                     |
[INFO] [stdout]    |                     help: remove this `mut`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_mut)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]    --> underscore_semant/src/monomorphize.rs:149:25
[INFO] [stdout]     |
[INFO] [stdout] 149 |                     let mut new_sym = env.symbol(&name);
[INFO] [stdout]     |                         ----^^^^^^^
[INFO] [stdout]     |                         |
[INFO] [stdout]     |                         help: remove this `mut`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]    --> underscore_semant/src/monomorphize.rs:152:29
[INFO] [stdout]     |
[INFO] [stdout] 152 |                         let mut defs = self.new_defs.get_mut(&symbol).unwrap();
[INFO] [stdout]     |                             ----^^^^
[INFO] [stdout]     |                             |
[INFO] [stdout]     |                             help: remove this `mut`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]    --> underscore_semant/src/monomorphize.rs:238:25
[INFO] [stdout]     |
[INFO] [stdout] 238 |                     let mut new_sym = env.symbol(&name);
[INFO] [stdout]     |                         ----^^^^^^^
[INFO] [stdout]     |                         |
[INFO] [stdout]     |                         help: remove this `mut`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]    --> underscore_semant/src/monomorphize.rs:325:21
[INFO] [stdout]     |
[INFO] [stdout] 325 |                 for mut statement in statements {
[INFO] [stdout]     |                     ----^^^^^^^^^
[INFO] [stdout]     |                     |
[INFO] [stdout]     |                     help: remove this `mut`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: fields `span` and `linkage` are never read
[INFO] [stdout]   --> underscore_semant/src/ast/lowered.rs:14:9
[INFO] [stdout]    |
[INFO] [stdout] 13 | pub struct Function {
[INFO] [stdout]    |            -------- fields in this struct
[INFO] [stdout] 14 |     pub span: Span,
[INFO] [stdout]    |         ^^^^
[INFO] [stdout] ...
[INFO] [stdout] 19 |     pub linkage: Linkage,
[INFO] [stdout]    |         ^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `Function` has a derived impl for the trait `Debug`, but this is intentionally ignored during dead code analysis
[INFO] [stdout]    = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `FindEscape` is never constructed
[INFO] [stdout]  --> underscore_semant/src/escape.rs:6:12
[INFO] [stdout]   |
[INFO] [stdout] 6 | pub struct FindEscape {
[INFO] [stdout]   |            ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: multiple associated items are never used
[INFO] [stdout]    --> underscore_semant/src/escape.rs:11:12
[INFO] [stdout]     |
[INFO] [stdout] 10  | impl FindEscape {
[INFO] [stdout]     | --------------- associated items in this implementation
[INFO] [stdout] 11  |     pub fn new() -> Self {
[INFO] [stdout]     |            ^^^
[INFO] [stdout] ...
[INFO] [stdout] 14  |     pub fn find_escape(
[INFO] [stdout]     |            ^^^^^^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 25  |     fn escape_function(
[INFO] [stdout]     |        ^^^^^^^^^^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 33  |     fn check_ident(&mut self, ident: Symbol, env: &mut Symbols<(u32, bool)>) -> InferResult<()> {
[INFO] [stdout]     |        ^^^^^^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 50  |     fn escape_statement(
[INFO] [stdout]     |        ^^^^^^^^^^^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 112 |     fn escape_expression(
[INFO] [stdout]     |        ^^^^^^^^^^^^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 196 |     fn check_var(&mut self, var: &Spanned<Var>, env: &mut Symbols<(u32, bool)>) -> InferResult<()> {
[INFO] [stdout]     |        ^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 9 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `escapes`
[INFO] [stdout]    --> underscore_semant/src/infer/function.rs:260:17
[INFO] [stdout]     |
[INFO] [stdout] 260 |                 ref escapes,
[INFO] [stdout]     |                 ^^^^^^^^^^^ help: try ignoring the field: `escapes: _`
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]   --> underscore_semant/src/infer/types.rs:60:21
[INFO] [stdout]    |
[INFO] [stdout] 60 |                 let mut ty = if let Some(ty) = env.look_type(ident.value).cloned() {
[INFO] [stdout]    |                     ----^^
[INFO] [stdout]    |                     |
[INFO] [stdout]    |                     help: remove this `mut`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_mut)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]    --> underscore_semant/src/monomorphize.rs:149:25
[INFO] [stdout]     |
[INFO] [stdout] 149 |                     let mut new_sym = env.symbol(&name);
[INFO] [stdout]     |                         ----^^^^^^^
[INFO] [stdout]     |                         |
[INFO] [stdout]     |                         help: remove this `mut`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]    --> underscore_semant/src/monomorphize.rs:152:29
[INFO] [stdout]     |
[INFO] [stdout] 152 |                         let mut defs = self.new_defs.get_mut(&symbol).unwrap();
[INFO] [stdout]     |                             ----^^^^
[INFO] [stdout]     |                             |
[INFO] [stdout]     |                             help: remove this `mut`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]    --> underscore_semant/src/monomorphize.rs:238:25
[INFO] [stdout]     |
[INFO] [stdout] 238 |                     let mut new_sym = env.symbol(&name);
[INFO] [stdout]     |                         ----^^^^^^^
[INFO] [stdout]     |                         |
[INFO] [stdout]     |                         help: remove this `mut`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]    --> underscore_semant/src/monomorphize.rs:325:21
[INFO] [stdout]     |
[INFO] [stdout] 325 |                 for mut statement in statements {
[INFO] [stdout]     |                     ----^^^^^^^^^
[INFO] [stdout]     |                     |
[INFO] [stdout]     |                     help: remove this `mut`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: fields `span` and `linkage` are never read
[INFO] [stdout]   --> underscore_semant/src/ast/lowered.rs:14:9
[INFO] [stdout]    |
[INFO] [stdout] 13 | pub struct Function {
[INFO] [stdout]    |            -------- fields in this struct
[INFO] [stdout] 14 |     pub span: Span,
[INFO] [stdout]    |         ^^^^
[INFO] [stdout] ...
[INFO] [stdout] 19 |     pub linkage: Linkage,
[INFO] [stdout]    |         ^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `Function` has a derived impl for the trait `Debug`, but this is intentionally ignored during dead code analysis
[INFO] [stdout]    = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `FindEscape` is never constructed
[INFO] [stdout]  --> underscore_semant/src/escape.rs:6:12
[INFO] [stdout]   |
[INFO] [stdout] 6 | pub struct FindEscape {
[INFO] [stdout]   |            ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: multiple associated items are never used
[INFO] [stdout]    --> underscore_semant/src/escape.rs:11:12
[INFO] [stdout]     |
[INFO] [stdout] 10  | impl FindEscape {
[INFO] [stdout]     | --------------- associated items in this implementation
[INFO] [stdout] 11  |     pub fn new() -> Self {
[INFO] [stdout]     |            ^^^
[INFO] [stdout] ...
[INFO] [stdout] 14  |     pub fn find_escape(
[INFO] [stdout]     |            ^^^^^^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 25  |     fn escape_function(
[INFO] [stdout]     |        ^^^^^^^^^^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 33  |     fn check_ident(&mut self, ident: Symbol, env: &mut Symbols<(u32, bool)>) -> InferResult<()> {
[INFO] [stdout]     |        ^^^^^^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 50  |     fn escape_statement(
[INFO] [stdout]     |        ^^^^^^^^^^^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 112 |     fn escape_expression(
[INFO] [stdout]     |        ^^^^^^^^^^^^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 196 |     fn check_var(&mut self, var: &Spanned<Var>, env: &mut Symbols<(u32, bool)>) -> InferResult<()> {
[INFO] [stdout]     |        ^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 9 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Checking structopt v0.1.7
[INFO] [stderr]     Checking underscore v0.1.0 (/opt/rustwide/workdir/underscore)
[INFO] [stdout] warning: unused `#[macro_use]` import
[INFO] [stdout]  --> underscore/src/main.rs:8:1
[INFO] [stdout]   |
[INFO] [stdout] 8 | #[macro_use]
[INFO] [stdout]   | ^^^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused `#[macro_use]` import
[INFO] [stdout]  --> underscore/src/main.rs:8:1
[INFO] [stdout]   |
[INFO] [stdout] 8 | #[macro_use]
[INFO] [stdout]   | ^^^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]   --> underscore/src/main.rs:97:12
[INFO] [stdout]    |
[INFO] [stdout] 97 |         Ok(mut ast) => {
[INFO] [stdout]    |            ----^^^
[INFO] [stdout]    |            |
[INFO] [stdout]    |            help: remove this `mut`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_mut)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]   --> underscore/src/main.rs:97:12
[INFO] [stdout]    |
[INFO] [stdout] 97 |         Ok(mut ast) => {
[INFO] [stdout]    |            ----^^^
[INFO] [stdout]    |            |
[INFO] [stdout]    |            help: remove this `mut`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_mut)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 2 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 2 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished `dev` profile [unoptimized + debuginfo] target(s) in 6.20s
[INFO] running `Command { std: "docker" "inspect" "e2c537d32068a6b4a36a659298109ad7085c9d7fec11b8e348a55606a6d6aaa0", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "e2c537d32068a6b4a36a659298109ad7085c9d7fec11b8e348a55606a6d6aaa0", kill_on_drop: false }`
[INFO] [stdout] e2c537d32068a6b4a36a659298109ad7085c9d7fec11b8e348a55606a6d6aaa0