Dec 17 11:24:42.503 INFO checking yiransheng/rust-lox against try#0b8c5828f68d7b2840b81fa51239346dc97fef5a for pr-54252
Dec 17 11:24:42.503 INFO running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/pr-54252/worker-3/try#0b8c5828f68d7b2840b81fa51239346dc97fef5a:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/pr-54252/sources/try#0b8c5828f68d7b2840b81fa51239346dc97fef5a/gh/yiransheng/rust-lox:/opt/crater/workdir:ro,Z" "-v" "/mnt/big/crater/work/local/cargo-home:/opt/crater/cargo-home:ro,Z" "-v" "/mnt/big/crater/work/local/rustup-home:/opt/crater/rustup-home:ro,Z" "-e" "USER_ID=1000" "-e" "SOURCE_DIR=/opt/crater/workdir" "-e" "MAP_USER_ID=1000" "-e" "CARGO_TARGET_DIR=/opt/crater/target" "-e" "CARGO_INCREMENTAL=0" "-e" "RUST_BACKTRACE=full" "-e" "RUSTFLAGS=--cap-lints=forbid" "-e" "CARGO_HOME=/opt/crater/cargo-home" "-e" "RUSTUP_HOME=/opt/crater/rustup-home" "-w" "/opt/crater/workdir" "-m" "1536M" "--network" "none" "rustops/crates-build-env" "/opt/crater/cargo-home/bin/cargo" "+0b8c5828f68d7b2840b81fa51239346dc97fef5a-alt" "check" "--frozen" "--all" "--all-targets"`
Dec 17 11:24:43.050 INFO [stdout] 33b0d253521963647682f31779cc4efaaf9684efa0eec8e2cb72c5a1942670ed
Dec 17 11:24:43.052 INFO running `"docker" "start" "-a" "33b0d253521963647682f31779cc4efaaf9684efa0eec8e2cb72c5a1942670ed"`
Dec 17 11:24:45.032 INFO [stderr]    Compiling proc-macro2 v0.4.20
Dec 17 11:24:45.032 INFO [stderr]    Compiling num-iter v0.1.37
Dec 17 11:24:45.032 INFO [stderr]    Compiling num-complex v0.2.1
Dec 17 11:24:45.032 INFO [stderr]    Compiling num-derive v0.2.3
Dec 17 11:24:45.032 INFO [stderr]     Checking arraydeque v0.4.3
Dec 17 11:24:45.032 INFO [stderr]    Compiling num-traits v0.2.6
Dec 17 11:24:45.032 INFO [stderr]     Checking num-integer v0.1.39
Dec 17 11:24:48.822 INFO [stderr]     Checking num-bigint v0.2.0
Dec 17 11:24:53.296 INFO [stderr]    Compiling quote v0.6.8
Dec 17 11:24:54.201 INFO [stderr]    Compiling syn v0.15.9
Dec 17 11:24:54.916 INFO [stderr]     Checking num-rational v0.2.1
Dec 17 11:24:55.729 INFO [stderr]     Checking num v0.2.0
Dec 17 11:25:08.488 INFO [stderr]     Checking loxvm v0.1.0 (/opt/crater/workdir)
Dec 17 11:25:08.684 INFO [stderr] warning: unused import: `object::*`
Dec 17 11:25:08.684 INFO [stderr]  --> src/compiler.rs:3:5
Dec 17 11:25:08.684 INFO [stderr]   |
Dec 17 11:25:08.684 INFO [stderr] 3 | use object::*;
Dec 17 11:25:08.684 INFO [stderr]   |     ^^^^^^^^^
Dec 17 11:25:08.684 INFO [stderr]   |
Dec 17 11:25:08.684 INFO [stderr]   = note: #[warn(unused_imports)] on by default
Dec 17 11:25:08.684 INFO [stderr] 
Dec 17 11:25:08.688 INFO [stderr] warning: unused import: `Into`
Dec 17 11:25:08.688 INFO [stderr]  --> src/value.rs:2:26
Dec 17 11:25:08.688 INFO [stderr]   |
Dec 17 11:25:08.688 INFO [stderr] 2 | use std::convert::{From, Into};
Dec 17 11:25:08.688 INFO [stderr]   |                          ^^^^
Dec 17 11:25:08.688 INFO [stderr] 
Dec 17 11:25:08.688 INFO [stderr] warning: unused import: `common::*`
Dec 17 11:25:08.688 INFO [stderr]   --> src/main.rs:17:5
Dec 17 11:25:08.688 INFO [stderr]    |
Dec 17 11:25:08.688 INFO [stderr] 17 | use common::*;
Dec 17 11:25:08.688 INFO [stderr]    |     ^^^^^^^^^
Dec 17 11:25:08.688 INFO [stderr] 
Dec 17 11:25:08.688 INFO [stderr] warning: unused import: `scanner::Scanner`
Dec 17 11:25:08.688 INFO [stderr]   --> src/main.rs:19:5
Dec 17 11:25:08.688 INFO [stderr]    |
Dec 17 11:25:08.688 INFO [stderr] 19 | use scanner::Scanner;
Dec 17 11:25:08.688 INFO [stderr]    |     ^^^^^^^^^^^^^^^^
Dec 17 11:25:08.688 INFO [stderr] 
Dec 17 11:25:08.688 INFO [stderr] warning: unused import: `scanner::TokenType`
Dec 17 11:25:08.688 INFO [stderr]   --> src/main.rs:20:5
Dec 17 11:25:08.688 INFO [stderr]    |
Dec 17 11:25:08.688 INFO [stderr] 20 | use scanner::TokenType;
Dec 17 11:25:08.689 INFO [stderr]    |     ^^^^^^^^^^^^^^^^^^
Dec 17 11:25:08.689 INFO [stderr] 
Dec 17 11:25:08.900 INFO [stderr] warning: unused import: `object::*`
Dec 17 11:25:08.900 INFO [stderr]  --> src/compiler.rs:3:5
Dec 17 11:25:08.900 INFO [stderr]   |
Dec 17 11:25:08.900 INFO [stderr] 3 | use object::*;
Dec 17 11:25:08.900 INFO [stderr]   |     ^^^^^^^^^
Dec 17 11:25:08.900 INFO [stderr]   |
Dec 17 11:25:08.900 INFO [stderr]   = note: #[warn(unused_imports)] on by default
Dec 17 11:25:08.900 INFO [stderr] 
Dec 17 11:25:08.904 INFO [stderr] warning: unused import: `Into`
Dec 17 11:25:08.904 INFO [stderr]  --> src/value.rs:2:26
Dec 17 11:25:08.904 INFO [stderr]   |
Dec 17 11:25:08.904 INFO [stderr] 2 | use std::convert::{From, Into};
Dec 17 11:25:08.904 INFO [stderr]   |                          ^^^^
Dec 17 11:25:08.904 INFO [stderr] 
Dec 17 11:25:08.904 INFO [stderr] warning: unused import: `common::*`
Dec 17 11:25:08.904 INFO [stderr]   --> src/main.rs:17:5
Dec 17 11:25:08.904 INFO [stderr]    |
Dec 17 11:25:08.904 INFO [stderr] 17 | use common::*;
Dec 17 11:25:08.904 INFO [stderr]    |     ^^^^^^^^^
Dec 17 11:25:08.904 INFO [stderr] 
Dec 17 11:25:08.904 INFO [stderr] warning: unused import: `scanner::Scanner`
Dec 17 11:25:08.904 INFO [stderr]   --> src/main.rs:19:5
Dec 17 11:25:08.904 INFO [stderr]    |
Dec 17 11:25:08.904 INFO [stderr] 19 | use scanner::Scanner;
Dec 17 11:25:08.904 INFO [stderr]    |     ^^^^^^^^^^^^^^^^
Dec 17 11:25:08.904 INFO [stderr] 
Dec 17 11:25:08.904 INFO [stderr] warning: unused import: `scanner::TokenType`
Dec 17 11:25:08.904 INFO [stderr]   --> src/main.rs:20:5
Dec 17 11:25:08.904 INFO [stderr]    |
Dec 17 11:25:08.904 INFO [stderr] 20 | use scanner::TokenType;
Dec 17 11:25:08.904 INFO [stderr]    |     ^^^^^^^^^^^^^^^^^^
Dec 17 11:25:08.904 INFO [stderr] 
Dec 17 11:25:09.229 INFO [stderr] warning: variant is never constructed: `TooManyConstants`
Dec 17 11:25:09.229 INFO [stderr]   --> src/compiler.rs:19:5
Dec 17 11:25:09.229 INFO [stderr]    |
Dec 17 11:25:09.229 INFO [stderr] 19 |     TooManyConstants,
Dec 17 11:25:09.229 INFO [stderr]    |     ^^^^^^^^^^^^^^^^
Dec 17 11:25:09.229 INFO [stderr]    |
Dec 17 11:25:09.229 INFO [stderr]    = note: #[warn(dead_code)] on by default
Dec 17 11:25:09.229 INFO [stderr] 
Dec 17 11:25:09.229 INFO [stderr] warning: method is never used: `error_at_current`
Dec 17 11:25:09.229 INFO [stderr]    --> src/compiler.rs:361:5
Dec 17 11:25:09.229 INFO [stderr]     |
Dec 17 11:25:09.229 INFO [stderr] 361 |     fn error_at_current(&mut self, message: &str) -> CompileError {
Dec 17 11:25:09.229 INFO [stderr]     |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
Dec 17 11:25:09.229 INFO [stderr] 
Dec 17 11:25:09.229 INFO [stderr] warning: variant is never constructed: `Function`
Dec 17 11:25:09.229 INFO [stderr]  --> src/object.rs:7:5
Dec 17 11:25:09.229 INFO [stderr]   |
Dec 17 11:25:09.229 INFO [stderr] 7 |     Function,
Dec 17 11:25:09.229 INFO [stderr]   |     ^^^^^^^^
Dec 17 11:25:09.229 INFO [stderr] 
Dec 17 11:25:09.229 INFO [stderr] warning: method is never used: `identifier_equal`
Dec 17 11:25:09.229 INFO [stderr]   --> src/scanner/token.rs:64:5
Dec 17 11:25:09.229 INFO [stderr]    |
Dec 17 11:25:09.229 INFO [stderr] 64 |     pub fn identifier_equal(&self, other: &Token<'a>) -> bool {
Dec 17 11:25:09.229 INFO [stderr]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
Dec 17 11:25:09.229 INFO [stderr] 
Dec 17 11:25:09.229 INFO [stderr] warning: method is never used: `take`
Dec 17 11:25:09.229 INFO [stderr]   --> src/value.rs:43:5
Dec 17 11:25:09.229 INFO [stderr]    |
Dec 17 11:25:09.229 INFO [stderr] 43 |     pub fn take(&mut self) -> Value<O> {
Dec 17 11:25:09.229 INFO [stderr]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
Dec 17 11:25:09.229 INFO [stderr] 
Dec 17 11:25:09.229 INFO [stderr] warning: method is never used: `into_bool`
Dec 17 11:25:09.229 INFO [stderr]   --> src/value.rs:52:5
Dec 17 11:25:09.229 INFO [stderr]    |
Dec 17 11:25:09.229 INFO [stderr] 52 |     pub fn into_bool(self) -> Option<bool> {
Dec 17 11:25:09.229 INFO [stderr]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
Dec 17 11:25:09.229 INFO [stderr] 
Dec 17 11:25:09.230 INFO [stderr] warning: unused `std::result::Result` that must be used
Dec 17 11:25:09.230 INFO [stderr]    --> src/chunk.rs:111:13
Dec 17 11:25:09.230 INFO [stderr]     |
Dec 17 11:25:09.230 INFO [stderr] 111 |             write!(write_to, "   | ");
Dec 17 11:25:09.230 INFO [stderr]     |             ^^^^^^^^^^^^^^^^^^^^^^^^^^
Dec 17 11:25:09.230 INFO [stderr]     |
Dec 17 11:25:09.230 INFO [stderr]     = note: #[warn(unused_must_use)] on by default
Dec 17 11:25:09.230 INFO [stderr]     = note: this `Result` may be an `Err` variant, which should be handled
Dec 17 11:25:09.230 INFO [stderr]     = note: this error originates in a macro outside of the current crate (in Nightly builds, run with -Z external-macro-backtrace for more info)
Dec 17 11:25:09.230 INFO [stderr] 
Dec 17 11:25:09.230 INFO [stderr] warning: unused `std::result::Result` that must be used
Dec 17 11:25:09.230 INFO [stderr]    --> src/chunk.rs:113:13
Dec 17 11:25:09.230 INFO [stderr]     |
Dec 17 11:25:09.230 INFO [stderr] 113 |             write!(write_to, "{:04} ", line_no);
Dec 17 11:25:09.230 INFO [stderr]     |             ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
Dec 17 11:25:09.230 INFO [stderr]     |
Dec 17 11:25:09.230 INFO [stderr]     = note: this `Result` may be an `Err` variant, which should be handled
Dec 17 11:25:09.230 INFO [stderr]     = note: this error originates in a macro outside of the current crate (in Nightly builds, run with -Z external-macro-backtrace for more info)
Dec 17 11:25:09.230 INFO [stderr] 
Dec 17 11:25:09.235 INFO [stderr] warning: unused `std::result::Result` that must be used
Dec 17 11:25:09.235 INFO [stderr]    --> src/chunk.rs:141:17
Dec 17 11:25:09.235 INFO [stderr]     |
Dec 17 11:25:09.235 INFO [stderr] 141 |                 writeln!(write_to, "Unknown OptCode {}", instr);
Dec 17 11:25:09.235 INFO [stderr]     |                 ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
Dec 17 11:25:09.235 INFO [stderr]     |
Dec 17 11:25:09.235 INFO [stderr]     = note: this `Result` may be an `Err` variant, which should be handled
Dec 17 11:25:09.235 INFO [stderr]     = note: this error originates in a macro outside of the current crate (in Nightly builds, run with -Z external-macro-backtrace for more info)
Dec 17 11:25:09.235 INFO [stderr] 
Dec 17 11:25:09.235 INFO [stderr] warning: unused `std::result::Result` that must be used
Dec 17 11:25:09.235 INFO [stderr]    --> src/chunk.rs:152:9
Dec 17 11:25:09.235 INFO [stderr]     |
Dec 17 11:25:09.235 INFO [stderr] 152 |         writeln!(write_to, "{}", name);
Dec 17 11:25:09.235 INFO [stderr]     |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
Dec 17 11:25:09.235 INFO [stderr]     |
Dec 17 11:25:09.235 INFO [stderr]     = note: this `Result` may be an `Err` variant, which should be handled
Dec 17 11:25:09.235 INFO [stderr]     = note: this error originates in a macro outside of the current crate (in Nightly builds, run with -Z external-macro-backtrace for more info)
Dec 17 11:25:09.235 INFO [stderr] 
Dec 17 11:25:09.235 INFO [stderr] warning: unused `std::result::Result` that must be used
Dec 17 11:25:09.235 INFO [stderr]    --> src/chunk.rs:163:9
Dec 17 11:25:09.235 INFO [stderr]     |
Dec 17 11:25:09.235 INFO [stderr] 163 |         write!(write_to, "{:<16} {:04} ", name, constant);
Dec 17 11:25:09.235 INFO [stderr]     |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
Dec 17 11:25:09.235 INFO [stderr]     |
Dec 17 11:25:09.235 INFO [stderr]     = note: this `Result` may be an `Err` variant, which should be handled
Dec 17 11:25:09.235 INFO [stderr]     = note: this error originates in a macro outside of the current crate (in Nightly builds, run with -Z external-macro-backtrace for more info)
Dec 17 11:25:09.235 INFO [stderr] 
Dec 17 11:25:09.235 INFO [stderr] warning: unused `std::result::Result` that must be used
Dec 17 11:25:09.235 INFO [stderr]    --> src/chunk.rs:164:9
Dec 17 11:25:09.235 INFO [stderr]     |
Dec 17 11:25:09.235 INFO [stderr] 164 |         writeln!(write_to, "{}", self.constants[constant as usize]);
Dec 17 11:25:09.235 INFO [stderr]     |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
Dec 17 11:25:09.235 INFO [stderr]     |
Dec 17 11:25:09.235 INFO [stderr]     = note: this `Result` may be an `Err` variant, which should be handled
Dec 17 11:25:09.235 INFO [stderr]     = note: this error originates in a macro outside of the current crate (in Nightly builds, run with -Z external-macro-backtrace for more info)
Dec 17 11:25:09.235 INFO [stderr] 
Dec 17 11:25:09.241 INFO [stderr] warning: unused `std::result::Result` that must be used
Dec 17 11:25:09.241 INFO [stderr]    --> src/vm.rs:227:9
Dec 17 11:25:09.241 INFO [stderr]     |
Dec 17 11:25:09.241 INFO [stderr] 227 |         writeln!(self.output, "{}", v);
Dec 17 11:25:09.241 INFO [stderr]     |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
Dec 17 11:25:09.241 INFO [stderr]     |
Dec 17 11:25:09.241 INFO [stderr]     = note: this `Result` may be an `Err` variant, which should be handled
Dec 17 11:25:09.241 INFO [stderr]     = note: this error originates in a macro outside of the current crate (in Nightly builds, run with -Z external-macro-backtrace for more info)
Dec 17 11:25:09.241 INFO [stderr] 
Dec 17 11:25:09.241 INFO [stderr] warning: unused `std::result::Result` that must be used
Dec 17 11:25:09.241 INFO [stderr]   --> src/main.rs:38:13
Dec 17 11:25:09.241 INFO [stderr]    |
Dec 17 11:25:09.241 INFO [stderr] 38 |             vm.interpret();
Dec 17 11:25:09.241 INFO [stderr]    |             ^^^^^^^^^^^^^^^
Dec 17 11:25:09.241 INFO [stderr]    |
Dec 17 11:25:09.241 INFO [stderr]    = note: this `Result` may be an `Err` variant, which should be handled
Dec 17 11:25:09.241 INFO [stderr] 
Dec 17 11:25:09.705 INFO [stderr] warning: variant is never constructed: `TooManyConstants`
Dec 17 11:25:09.705 INFO [stderr]   --> src/compiler.rs:19:5
Dec 17 11:25:09.705 INFO [stderr]    |
Dec 17 11:25:09.705 INFO [stderr] 19 |     TooManyConstants,
Dec 17 11:25:09.705 INFO [stderr]    |     ^^^^^^^^^^^^^^^^
Dec 17 11:25:09.705 INFO [stderr]    |
Dec 17 11:25:09.705 INFO [stderr]    = note: #[warn(dead_code)] on by default
Dec 17 11:25:09.705 INFO [stderr] 
Dec 17 11:25:09.705 INFO [stderr] warning: method is never used: `error_at_current`
Dec 17 11:25:09.705 INFO [stderr]    --> src/compiler.rs:361:5
Dec 17 11:25:09.705 INFO [stderr]     |
Dec 17 11:25:09.705 INFO [stderr] 361 |     fn error_at_current(&mut self, message: &str) -> CompileError {
Dec 17 11:25:09.705 INFO [stderr]     |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
Dec 17 11:25:09.705 INFO [stderr] 
Dec 17 11:25:09.705 INFO [stderr] warning: variant is never constructed: `Function`
Dec 17 11:25:09.705 INFO [stderr]  --> src/object.rs:7:5
Dec 17 11:25:09.705 INFO [stderr]   |
Dec 17 11:25:09.705 INFO [stderr] 7 |     Function,
Dec 17 11:25:09.705 INFO [stderr]   |     ^^^^^^^^
Dec 17 11:25:09.705 INFO [stderr] 
Dec 17 11:25:09.705 INFO [stderr] warning: method is never used: `identifier_equal`
Dec 17 11:25:09.705 INFO [stderr]   --> src/scanner/token.rs:64:5
Dec 17 11:25:09.705 INFO [stderr]    |
Dec 17 11:25:09.705 INFO [stderr] 64 |     pub fn identifier_equal(&self, other: &Token<'a>) -> bool {
Dec 17 11:25:09.705 INFO [stderr]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
Dec 17 11:25:09.705 INFO [stderr] 
Dec 17 11:25:09.705 INFO [stderr] warning: method is never used: `take`
Dec 17 11:25:09.705 INFO [stderr]   --> src/value.rs:43:5
Dec 17 11:25:09.705 INFO [stderr]    |
Dec 17 11:25:09.705 INFO [stderr] 43 |     pub fn take(&mut self) -> Value<O> {
Dec 17 11:25:09.705 INFO [stderr]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
Dec 17 11:25:09.705 INFO [stderr] 
Dec 17 11:25:09.705 INFO [stderr] warning: method is never used: `into_bool`
Dec 17 11:25:09.705 INFO [stderr]   --> src/value.rs:52:5
Dec 17 11:25:09.705 INFO [stderr]    |
Dec 17 11:25:09.705 INFO [stderr] 52 |     pub fn into_bool(self) -> Option<bool> {
Dec 17 11:25:09.705 INFO [stderr]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
Dec 17 11:25:09.705 INFO [stderr] 
Dec 17 11:25:09.705 INFO [stderr] warning: unused `std::result::Result` that must be used
Dec 17 11:25:09.705 INFO [stderr]    --> src/chunk.rs:111:13
Dec 17 11:25:09.705 INFO [stderr]     |
Dec 17 11:25:09.705 INFO [stderr] 111 |             write!(write_to, "   | ");
Dec 17 11:25:09.705 INFO [stderr]     |             ^^^^^^^^^^^^^^^^^^^^^^^^^^
Dec 17 11:25:09.705 INFO [stderr]     |
Dec 17 11:25:09.705 INFO [stderr]     = note: #[warn(unused_must_use)] on by default
Dec 17 11:25:09.705 INFO [stderr]     = note: this `Result` may be an `Err` variant, which should be handled
Dec 17 11:25:09.705 INFO [stderr]     = note: this error originates in a macro outside of the current crate (in Nightly builds, run with -Z external-macro-backtrace for more info)
Dec 17 11:25:09.705 INFO [stderr] 
Dec 17 11:25:09.705 INFO [stderr] warning: unused `std::result::Result` that must be used
Dec 17 11:25:09.705 INFO [stderr]    --> src/chunk.rs:113:13
Dec 17 11:25:09.706 INFO [stderr]     |
Dec 17 11:25:09.706 INFO [stderr] 113 |             write!(write_to, "{:04} ", line_no);
Dec 17 11:25:09.706 INFO [stderr]     |             ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
Dec 17 11:25:09.706 INFO [stderr]     |
Dec 17 11:25:09.706 INFO [stderr]     = note: this `Result` may be an `Err` variant, which should be handled
Dec 17 11:25:09.706 INFO [stderr]     = note: this error originates in a macro outside of the current crate (in Nightly builds, run with -Z external-macro-backtrace for more info)
Dec 17 11:25:09.706 INFO [stderr] 
Dec 17 11:25:09.706 INFO [stderr] warning: unused `std::result::Result` that must be used
Dec 17 11:25:09.706 INFO [stderr]    --> src/chunk.rs:141:17
Dec 17 11:25:09.706 INFO [stderr]     |
Dec 17 11:25:09.706 INFO [stderr] 141 |                 writeln!(write_to, "Unknown OptCode {}", instr);
Dec 17 11:25:09.706 INFO [stderr]     |                 ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
Dec 17 11:25:09.706 INFO [stderr]     |
Dec 17 11:25:09.706 INFO [stderr]     = note: this `Result` may be an `Err` variant, which should be handled
Dec 17 11:25:09.706 INFO [stderr]     = note: this error originates in a macro outside of the current crate (in Nightly builds, run with -Z external-macro-backtrace for more info)
Dec 17 11:25:09.706 INFO [stderr] 
Dec 17 11:25:09.706 INFO [stderr] warning: unused `std::result::Result` that must be used
Dec 17 11:25:09.706 INFO [stderr]    --> src/chunk.rs:152:9
Dec 17 11:25:09.706 INFO [stderr]     |
Dec 17 11:25:09.706 INFO [stderr] 152 |         writeln!(write_to, "{}", name);
Dec 17 11:25:09.706 INFO [stderr]     |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
Dec 17 11:25:09.706 INFO [stderr]     |
Dec 17 11:25:09.706 INFO [stderr]     = note: this `Result` may be an `Err` variant, which should be handled
Dec 17 11:25:09.706 INFO [stderr]     = note: this error originates in a macro outside of the current crate (in Nightly builds, run with -Z external-macro-backtrace for more info)
Dec 17 11:25:09.706 INFO [stderr] 
Dec 17 11:25:09.706 INFO [stderr] warning: unused `std::result::Result` that must be used
Dec 17 11:25:09.706 INFO [stderr]    --> src/chunk.rs:163:9
Dec 17 11:25:09.706 INFO [stderr]     |
Dec 17 11:25:09.706 INFO [stderr] 163 |         write!(write_to, "{:<16} {:04} ", name, constant);
Dec 17 11:25:09.706 INFO [stderr]     |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
Dec 17 11:25:09.706 INFO [stderr]     |
Dec 17 11:25:09.706 INFO [stderr]     = note: this `Result` may be an `Err` variant, which should be handled
Dec 17 11:25:09.706 INFO [stderr]     = note: this error originates in a macro outside of the current crate (in Nightly builds, run with -Z external-macro-backtrace for more info)
Dec 17 11:25:09.706 INFO [stderr] 
Dec 17 11:25:09.706 INFO [stderr] warning: unused `std::result::Result` that must be used
Dec 17 11:25:09.706 INFO [stderr]    --> src/chunk.rs:164:9
Dec 17 11:25:09.706 INFO [stderr]     |
Dec 17 11:25:09.706 INFO [stderr] 164 |         writeln!(write_to, "{}", self.constants[constant as usize]);
Dec 17 11:25:09.706 INFO [stderr]     |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
Dec 17 11:25:09.706 INFO [stderr]     |
Dec 17 11:25:09.706 INFO [stderr]     = note: this `Result` may be an `Err` variant, which should be handled
Dec 17 11:25:09.706 INFO [stderr]     = note: this error originates in a macro outside of the current crate (in Nightly builds, run with -Z external-macro-backtrace for more info)
Dec 17 11:25:09.706 INFO [stderr] 
Dec 17 11:25:09.708 INFO [stderr] warning: unused `std::result::Result` that must be used
Dec 17 11:25:09.708 INFO [stderr]    --> src/vm.rs:227:9
Dec 17 11:25:09.708 INFO [stderr]     |
Dec 17 11:25:09.708 INFO [stderr] 227 |         writeln!(self.output, "{}", v);
Dec 17 11:25:09.708 INFO [stderr]     |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
Dec 17 11:25:09.708 INFO [stderr]     |
Dec 17 11:25:09.708 INFO [stderr]     = note: this `Result` may be an `Err` variant, which should be handled
Dec 17 11:25:09.708 INFO [stderr]     = note: this error originates in a macro outside of the current crate (in Nightly builds, run with -Z external-macro-backtrace for more info)
Dec 17 11:25:09.708 INFO [stderr] 
Dec 17 11:25:09.708 INFO [stderr] warning: unused `std::result::Result` that must be used
Dec 17 11:25:09.708 INFO [stderr]   --> src/main.rs:38:13
Dec 17 11:25:09.708 INFO [stderr]    |
Dec 17 11:25:09.708 INFO [stderr] 38 |             vm.interpret();
Dec 17 11:25:09.708 INFO [stderr]    |             ^^^^^^^^^^^^^^^
Dec 17 11:25:09.708 INFO [stderr]    |
Dec 17 11:25:09.708 INFO [stderr]    = note: this `Result` may be an `Err` variant, which should be handled
Dec 17 11:25:09.708 INFO [stderr] 
Dec 17 11:25:09.748 INFO [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 24.79s
Dec 17 11:25:10.432 INFO running `"docker" "inspect" "33b0d253521963647682f31779cc4efaaf9684efa0eec8e2cb72c5a1942670ed"`
Dec 17 11:25:10.802 INFO running `"docker" "rm" "-f" "33b0d253521963647682f31779cc4efaaf9684efa0eec8e2cb72c5a1942670ed"`
Dec 17 11:25:11.232 INFO [stdout] 33b0d253521963647682f31779cc4efaaf9684efa0eec8e2cb72c5a1942670ed