Nov 27 16:33:48.934 INFO checking yiransheng/rust-lox against master#0b9f19dff1347e29bf4362ab5a8fab84b43023b5 for pr-56074
Nov 27 16:33:48.935 INFO running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/pr-56074/worker-5/master#0b9f19dff1347e29bf4362ab5a8fab84b43023b5:/target:rw,Z" "-v" "/mnt/big/crater/work/local/test-source/worker-5/pr-56074/master#0b9f19dff1347e29bf4362ab5a8fab84b43023b5:/source:ro,Z" "-v" "/mnt/big/crater/work/local/cargo-home:/cargo-home:ro,Z" "-v" "/mnt/big/crater/work/local/rustup-home:/rustup-home:ro,Z" "-e" "USER_ID=1000" "-e" "SOURCE_DIR=/source" "-e" "USER_ID=1000" "-e" "CMD=cargo +0b9f19dff1347e29bf4362ab5a8fab84b43023b5-alt check --frozen --all --all-targets" "-e" "CARGO_TARGET_DIR=/target" "-e" "CARGO_INCREMENTAL=0" "-e" "RUST_BACKTRACE=full" "-e" "RUSTFLAGS=--cap-lints=forbid" "-e" "CARGO_HOME=/cargo-home" "-e" "RUSTUP_HOME=/rustup-home" "-m" "1536M" "--network" "none" "crater"`
Nov 27 16:33:49.457 INFO [stdout] 643f1390a304ad61dba18adc6c6cfc80e350304526aff151d1df59edc14e074c
Nov 27 16:33:49.459 INFO running `"docker" "start" "-a" "643f1390a304ad61dba18adc6c6cfc80e350304526aff151d1df59edc14e074c"`
Nov 27 16:33:51.692 INFO [stderr] usermod: no changes
Nov 27 16:33:51.849 INFO [stderr]    Compiling num-integer v0.1.39
Nov 27 16:33:51.849 INFO [stderr]    Compiling num-bigint v0.2.0
Nov 27 16:33:51.850 INFO [stderr]    Compiling num-complex v0.2.1
Nov 27 16:33:51.850 INFO [stderr]    Compiling num-rational v0.2.1
Nov 27 16:33:51.850 INFO [stderr]    Compiling num-iter v0.1.37
Nov 27 16:33:51.851 INFO [stderr]    Compiling num-derive v0.2.3
Nov 27 16:33:51.851 INFO [stderr]     Checking arraydeque v0.4.3
Nov 27 16:33:51.855 INFO [stderr]    Compiling num-traits v0.2.6
Nov 27 16:33:56.968 INFO [stderr]    Compiling syn v0.15.9
Nov 27 16:34:04.555 INFO [stderr]     Checking num v0.2.0
Nov 27 16:34:17.653 INFO [stderr]     Checking loxvm v0.1.0 (/source)
Nov 27 16:34:17.864 INFO [stderr] warning: unused import: `object::*`
Nov 27 16:34:17.864 INFO [stderr]  --> src/compiler.rs:3:5
Nov 27 16:34:17.864 INFO [stderr]   |
Nov 27 16:34:17.865 INFO [stderr] 3 | use object::*;
Nov 27 16:34:17.865 INFO [stderr]   |     ^^^^^^^^^
Nov 27 16:34:17.865 INFO [stderr]   |
Nov 27 16:34:17.866 INFO [stderr]   = note: #[warn(unused_imports)] on by default
Nov 27 16:34:17.866 INFO [stderr] 
Nov 27 16:34:17.879 INFO [stderr] warning: unused import: `Into`
Nov 27 16:34:17.879 INFO [stderr]  --> src/value.rs:2:26
Nov 27 16:34:17.880 INFO [stderr]   |
Nov 27 16:34:17.898 INFO [stderr] 2 | use std::convert::{From, Into};
Nov 27 16:34:17.898 INFO [stderr]   |                          ^^^^
Nov 27 16:34:17.898 INFO [stderr] 
Nov 27 16:34:17.899 INFO [stderr] warning: unused import: `common::*`
Nov 27 16:34:17.899 INFO [stderr]   --> src/main.rs:17:5
Nov 27 16:34:17.899 INFO [stderr]    |
Nov 27 16:34:17.899 INFO [stderr] 17 | use common::*;
Nov 27 16:34:17.900 INFO [stderr]    |     ^^^^^^^^^
Nov 27 16:34:17.913 INFO [stderr] 
Nov 27 16:34:17.914 INFO [stderr] warning: unused import: `scanner::Scanner`
Nov 27 16:34:17.914 INFO [stderr]   --> src/main.rs:19:5
Nov 27 16:34:17.914 INFO [stderr]    |
Nov 27 16:34:17.914 INFO [stderr] 19 | use scanner::Scanner;
Nov 27 16:34:17.915 INFO [stderr]    |     ^^^^^^^^^^^^^^^^
Nov 27 16:34:17.915 INFO [stderr] 
Nov 27 16:34:17.915 INFO [stderr] warning: unused import: `scanner::TokenType`
Nov 27 16:34:17.915 INFO [stderr]   --> src/main.rs:20:5
Nov 27 16:34:17.915 INFO [stderr]    |
Nov 27 16:34:17.915 INFO [stderr] 20 | use scanner::TokenType;
Nov 27 16:34:17.916 INFO [stderr]    |     ^^^^^^^^^^^^^^^^^^
Nov 27 16:34:17.916 INFO [stderr] 
Nov 27 16:34:17.936 INFO [stderr] warning: unused import: `object::*`
Nov 27 16:34:17.936 INFO [stderr]  --> src/compiler.rs:3:5
Nov 27 16:34:17.936 INFO [stderr]   |
Nov 27 16:34:17.936 INFO [stderr] 3 | use object::*;
Nov 27 16:34:17.936 INFO [stderr]   |     ^^^^^^^^^
Nov 27 16:34:17.936 INFO [stderr]   |
Nov 27 16:34:17.936 INFO [stderr]   = note: #[warn(unused_imports)] on by default
Nov 27 16:34:17.936 INFO [stderr] 
Nov 27 16:34:17.936 INFO [stderr] warning: unused import: `Into`
Nov 27 16:34:17.936 INFO [stderr]  --> src/value.rs:2:26
Nov 27 16:34:17.936 INFO [stderr]   |
Nov 27 16:34:17.936 INFO [stderr] 2 | use std::convert::{From, Into};
Nov 27 16:34:17.936 INFO [stderr]   |                          ^^^^
Nov 27 16:34:17.936 INFO [stderr] 
Nov 27 16:34:17.936 INFO [stderr] warning: unused import: `common::*`
Nov 27 16:34:17.936 INFO [stderr]   --> src/main.rs:17:5
Nov 27 16:34:17.936 INFO [stderr]    |
Nov 27 16:34:17.936 INFO [stderr] 17 | use common::*;
Nov 27 16:34:17.936 INFO [stderr]    |     ^^^^^^^^^
Nov 27 16:34:17.936 INFO [stderr] 
Nov 27 16:34:17.936 INFO [stderr] warning: unused import: `scanner::Scanner`
Nov 27 16:34:17.936 INFO [stderr]   --> src/main.rs:19:5
Nov 27 16:34:17.937 INFO [stderr]    |
Nov 27 16:34:17.937 INFO [stderr] 19 | use scanner::Scanner;
Nov 27 16:34:17.937 INFO [stderr]    |     ^^^^^^^^^^^^^^^^
Nov 27 16:34:17.938 INFO [stderr] 
Nov 27 16:34:17.938 INFO [stderr] warning: unused import: `scanner::TokenType`
Nov 27 16:34:17.938 INFO [stderr]   --> src/main.rs:20:5
Nov 27 16:34:17.938 INFO [stderr]    |
Nov 27 16:34:17.938 INFO [stderr] 20 | use scanner::TokenType;
Nov 27 16:34:17.938 INFO [stderr]    |     ^^^^^^^^^^^^^^^^^^
Nov 27 16:34:17.938 INFO [stderr] 
Nov 27 16:34:18.440 INFO [stderr] warning: variant is never constructed: `TooManyConstants`
Nov 27 16:34:18.440 INFO [stderr]   --> src/compiler.rs:19:5
Nov 27 16:34:18.440 INFO [stderr]    |
Nov 27 16:34:18.440 INFO [stderr] 19 |     TooManyConstants,
Nov 27 16:34:18.440 INFO [stderr]    |     ^^^^^^^^^^^^^^^^
Nov 27 16:34:18.440 INFO [stderr]    |
Nov 27 16:34:18.445 INFO [stderr]    = note: #[warn(dead_code)] on by default
Nov 27 16:34:18.445 INFO [stderr] 
Nov 27 16:34:18.445 INFO [stderr] warning: method is never used: `error_at_current`
Nov 27 16:34:18.445 INFO [stderr]    --> src/compiler.rs:361:5
Nov 27 16:34:18.445 INFO [stderr]     |
Nov 27 16:34:18.445 INFO [stderr] 361 |     fn error_at_current(&mut self, message: &str) -> CompileError {
Nov 27 16:34:18.445 INFO [stderr]     |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
Nov 27 16:34:18.445 INFO [stderr] 
Nov 27 16:34:18.445 INFO [stderr] warning: variant is never constructed: `Function`
Nov 27 16:34:18.445 INFO [stderr]  --> src/object.rs:7:5
Nov 27 16:34:18.445 INFO [stderr]   |
Nov 27 16:34:18.445 INFO [stderr] 7 |     Function,
Nov 27 16:34:18.445 INFO [stderr]   |     ^^^^^^^^
Nov 27 16:34:18.445 INFO [stderr] 
Nov 27 16:34:18.445 INFO [stderr] warning: method is never used: `identifier_equal`
Nov 27 16:34:18.445 INFO [stderr]   --> src/scanner/token.rs:64:5
Nov 27 16:34:18.445 INFO [stderr]    |
Nov 27 16:34:18.445 INFO [stderr] 64 |     pub fn identifier_equal(&self, other: &Token<'a>) -> bool {
Nov 27 16:34:18.445 INFO [stderr]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
Nov 27 16:34:18.445 INFO [stderr] 
Nov 27 16:34:18.445 INFO [stderr] warning: method is never used: `take`
Nov 27 16:34:18.445 INFO [stderr]   --> src/value.rs:43:5
Nov 27 16:34:18.445 INFO [stderr]    |
Nov 27 16:34:18.445 INFO [stderr] 43 |     pub fn take(&mut self) -> Value<O> {
Nov 27 16:34:18.445 INFO [stderr]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
Nov 27 16:34:18.445 INFO [stderr] 
Nov 27 16:34:18.445 INFO [stderr] warning: method is never used: `into_bool`
Nov 27 16:34:18.445 INFO [stderr]   --> src/value.rs:52:5
Nov 27 16:34:18.445 INFO [stderr]    |
Nov 27 16:34:18.445 INFO [stderr] 52 |     pub fn into_bool(self) -> Option<bool> {
Nov 27 16:34:18.445 INFO [stderr]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
Nov 27 16:34:18.445 INFO [stderr] 
Nov 27 16:34:18.445 INFO [stderr] warning: unused `std::result::Result` that must be used
Nov 27 16:34:18.445 INFO [stderr]    --> src/chunk.rs:111:13
Nov 27 16:34:18.445 INFO [stderr]     |
Nov 27 16:34:18.445 INFO [stderr] 111 |             write!(write_to, "   | ");
Nov 27 16:34:18.445 INFO [stderr]     |             ^^^^^^^^^^^^^^^^^^^^^^^^^^
Nov 27 16:34:18.445 INFO [stderr]     |
Nov 27 16:34:18.445 INFO [stderr]     = note: #[warn(unused_must_use)] on by default
Nov 27 16:34:18.445 INFO [stderr]     = note: this `Result` may be an `Err` variant, which should be handled
Nov 27 16:34:18.445 INFO [stderr]     = note: this error originates in a macro outside of the current crate (in Nightly builds, run with -Z external-macro-backtrace for more info)
Nov 27 16:34:18.445 INFO [stderr] 
Nov 27 16:34:18.445 INFO [stderr] warning: unused `std::result::Result` that must be used
Nov 27 16:34:18.445 INFO [stderr]    --> src/chunk.rs:113:13
Nov 27 16:34:18.445 INFO [stderr]     |
Nov 27 16:34:18.445 INFO [stderr] 113 |             write!(write_to, "{:04} ", line_no);
Nov 27 16:34:18.445 INFO [stderr]     |             ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
Nov 27 16:34:18.445 INFO [stderr]     |
Nov 27 16:34:18.445 INFO [stderr]     = note: this `Result` may be an `Err` variant, which should be handled
Nov 27 16:34:18.445 INFO [stderr]     = note: this error originates in a macro outside of the current crate (in Nightly builds, run with -Z external-macro-backtrace for more info)
Nov 27 16:34:18.445 INFO [stderr] 
Nov 27 16:34:18.445 INFO [stderr] warning: unused `std::result::Result` that must be used
Nov 27 16:34:18.445 INFO [stderr]    --> src/chunk.rs:141:17
Nov 27 16:34:18.445 INFO [stderr]     |
Nov 27 16:34:18.445 INFO [stderr] 141 |                 writeln!(write_to, "Unknown OptCode {}", instr);
Nov 27 16:34:18.445 INFO [stderr]     |                 ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
Nov 27 16:34:18.445 INFO [stderr]     |
Nov 27 16:34:18.445 INFO [stderr]     = note: this `Result` may be an `Err` variant, which should be handled
Nov 27 16:34:18.445 INFO [stderr]     = note: this error originates in a macro outside of the current crate (in Nightly builds, run with -Z external-macro-backtrace for more info)
Nov 27 16:34:18.445 INFO [stderr] 
Nov 27 16:34:18.445 INFO [stderr] warning: unused `std::result::Result` that must be used
Nov 27 16:34:18.445 INFO [stderr]    --> src/chunk.rs:152:9
Nov 27 16:34:18.445 INFO [stderr]     |
Nov 27 16:34:18.445 INFO [stderr] 152 |         writeln!(write_to, "{}", name);
Nov 27 16:34:18.445 INFO [stderr]     |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
Nov 27 16:34:18.445 INFO [stderr]     |
Nov 27 16:34:18.445 INFO [stderr]     = note: this `Result` may be an `Err` variant, which should be handled
Nov 27 16:34:18.445 INFO [stderr]     = note: this error originates in a macro outside of the current crate (in Nightly builds, run with -Z external-macro-backtrace for more info)
Nov 27 16:34:18.445 INFO [stderr] 
Nov 27 16:34:18.445 INFO [stderr] warning: unused `std::result::Result` that must be used
Nov 27 16:34:18.446 INFO [stderr]    --> src/chunk.rs:163:9
Nov 27 16:34:18.446 INFO [stderr]     |
Nov 27 16:34:18.446 INFO [stderr] 163 |         write!(write_to, "{:<16} {:04} ", name, constant);
Nov 27 16:34:18.446 INFO [stderr]     |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
Nov 27 16:34:18.446 INFO [stderr]     |
Nov 27 16:34:18.446 INFO [stderr]     = note: this `Result` may be an `Err` variant, which should be handled
Nov 27 16:34:18.446 INFO [stderr]     = note: this error originates in a macro outside of the current crate (in Nightly builds, run with -Z external-macro-backtrace for more info)
Nov 27 16:34:18.446 INFO [stderr] 
Nov 27 16:34:18.446 INFO [stderr] warning: unused `std::result::Result` that must be used
Nov 27 16:34:18.446 INFO [stderr]    --> src/chunk.rs:164:9
Nov 27 16:34:18.446 INFO [stderr]     |
Nov 27 16:34:18.446 INFO [stderr] 164 |         writeln!(write_to, "{}", self.constants[constant as usize]);
Nov 27 16:34:18.446 INFO [stderr]     |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
Nov 27 16:34:18.446 INFO [stderr]     |
Nov 27 16:34:18.446 INFO [stderr]     = note: this `Result` may be an `Err` variant, which should be handled
Nov 27 16:34:18.446 INFO [stderr]     = note: this error originates in a macro outside of the current crate (in Nightly builds, run with -Z external-macro-backtrace for more info)
Nov 27 16:34:18.446 INFO [stderr] 
Nov 27 16:34:18.447 INFO [stderr] warning: unused `std::result::Result` that must be used
Nov 27 16:34:18.447 INFO [stderr]    --> src/vm.rs:227:9
Nov 27 16:34:18.447 INFO [stderr]     |
Nov 27 16:34:18.447 INFO [stderr] 227 |         writeln!(self.output, "{}", v);
Nov 27 16:34:18.447 INFO [stderr]     |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
Nov 27 16:34:18.447 INFO [stderr]     |
Nov 27 16:34:18.447 INFO [stderr]     = note: this `Result` may be an `Err` variant, which should be handled
Nov 27 16:34:18.447 INFO [stderr]     = note: this error originates in a macro outside of the current crate (in Nightly builds, run with -Z external-macro-backtrace for more info)
Nov 27 16:34:18.447 INFO [stderr] 
Nov 27 16:34:18.447 INFO [stderr] warning: unused `std::result::Result` that must be used
Nov 27 16:34:18.447 INFO [stderr]   --> src/main.rs:38:13
Nov 27 16:34:18.447 INFO [stderr]    |
Nov 27 16:34:18.447 INFO [stderr] 38 |             vm.interpret();
Nov 27 16:34:18.447 INFO [stderr]    |             ^^^^^^^^^^^^^^^
Nov 27 16:34:18.447 INFO [stderr]    |
Nov 27 16:34:18.447 INFO [stderr]    = note: this `Result` may be an `Err` variant, which should be handled
Nov 27 16:34:18.447 INFO [stderr] 
Nov 27 16:34:18.583 INFO [stderr] warning: variant is never constructed: `TooManyConstants`
Nov 27 16:34:18.583 INFO [stderr]   --> src/compiler.rs:19:5
Nov 27 16:34:18.583 INFO [stderr]    |
Nov 27 16:34:18.583 INFO [stderr] 19 |     TooManyConstants,
Nov 27 16:34:18.583 INFO [stderr]    |     ^^^^^^^^^^^^^^^^
Nov 27 16:34:18.583 INFO [stderr]    |
Nov 27 16:34:18.583 INFO [stderr]    = note: #[warn(dead_code)] on by default
Nov 27 16:34:18.583 INFO [stderr] 
Nov 27 16:34:18.583 INFO [stderr] warning: method is never used: `error_at_current`
Nov 27 16:34:18.583 INFO [stderr]    --> src/compiler.rs:361:5
Nov 27 16:34:18.584 INFO [stderr]     |
Nov 27 16:34:18.584 INFO [stderr] 361 |     fn error_at_current(&mut self, message: &str) -> CompileError {
Nov 27 16:34:18.584 INFO [stderr]     |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
Nov 27 16:34:18.584 INFO [stderr] 
Nov 27 16:34:18.584 INFO [stderr] warning: variant is never constructed: `Function`
Nov 27 16:34:18.584 INFO [stderr]  --> src/object.rs:7:5
Nov 27 16:34:18.584 INFO [stderr]   |
Nov 27 16:34:18.584 INFO [stderr] 7 |     Function,
Nov 27 16:34:18.584 INFO [stderr]   |     ^^^^^^^^
Nov 27 16:34:18.584 INFO [stderr] 
Nov 27 16:34:18.593 INFO [stderr] warning: method is never used: `identifier_equal`
Nov 27 16:34:18.593 INFO [stderr]   --> src/scanner/token.rs:64:5
Nov 27 16:34:18.593 INFO [stderr]    |
Nov 27 16:34:18.593 INFO [stderr] 64 |     pub fn identifier_equal(&self, other: &Token<'a>) -> bool {
Nov 27 16:34:18.593 INFO [stderr]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
Nov 27 16:34:18.593 INFO [stderr] 
Nov 27 16:34:18.593 INFO [stderr] warning: method is never used: `take`
Nov 27 16:34:18.593 INFO [stderr]   --> src/value.rs:43:5
Nov 27 16:34:18.593 INFO [stderr]    |
Nov 27 16:34:18.593 INFO [stderr] 43 |     pub fn take(&mut self) -> Value<O> {
Nov 27 16:34:18.593 INFO [stderr]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
Nov 27 16:34:18.593 INFO [stderr] 
Nov 27 16:34:18.593 INFO [stderr] warning: method is never used: `into_bool`
Nov 27 16:34:18.593 INFO [stderr]   --> src/value.rs:52:5
Nov 27 16:34:18.593 INFO [stderr]    |
Nov 27 16:34:18.593 INFO [stderr] 52 |     pub fn into_bool(self) -> Option<bool> {
Nov 27 16:34:18.593 INFO [stderr]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
Nov 27 16:34:18.593 INFO [stderr] 
Nov 27 16:34:18.598 INFO [stderr] warning: unused `std::result::Result` that must be used
Nov 27 16:34:18.598 INFO [stderr]    --> src/chunk.rs:111:13
Nov 27 16:34:18.598 INFO [stderr]     |
Nov 27 16:34:18.598 INFO [stderr] 111 |             write!(write_to, "   | ");
Nov 27 16:34:18.598 INFO [stderr]     |             ^^^^^^^^^^^^^^^^^^^^^^^^^^
Nov 27 16:34:18.598 INFO [stderr]     |
Nov 27 16:34:18.598 INFO [stderr]     = note: #[warn(unused_must_use)] on by default
Nov 27 16:34:18.598 INFO [stderr]     = note: this `Result` may be an `Err` variant, which should be handled
Nov 27 16:34:18.598 INFO [stderr]     = note: this error originates in a macro outside of the current crate (in Nightly builds, run with -Z external-macro-backtrace for more info)
Nov 27 16:34:18.598 INFO [stderr] 
Nov 27 16:34:18.598 INFO [stderr] warning: unused `std::result::Result` that must be used
Nov 27 16:34:18.598 INFO [stderr]    --> src/chunk.rs:113:13
Nov 27 16:34:18.598 INFO [stderr]     |
Nov 27 16:34:18.598 INFO [stderr] 113 |             write!(write_to, "{:04} ", line_no);
Nov 27 16:34:18.598 INFO [stderr]     |             ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
Nov 27 16:34:18.598 INFO [stderr]     |
Nov 27 16:34:18.598 INFO [stderr]     = note: this `Result` may be an `Err` variant, which should be handled
Nov 27 16:34:18.598 INFO [stderr]     = note: this error originates in a macro outside of the current crate (in Nightly builds, run with -Z external-macro-backtrace for more info)
Nov 27 16:34:18.598 INFO [stderr] 
Nov 27 16:34:18.598 INFO [stderr] warning: unused `std::result::Result` that must be used
Nov 27 16:34:18.598 INFO [stderr]    --> src/chunk.rs:141:17
Nov 27 16:34:18.598 INFO [stderr]     |
Nov 27 16:34:18.598 INFO [stderr] 141 |                 writeln!(write_to, "Unknown OptCode {}", instr);
Nov 27 16:34:18.598 INFO [stderr]     |                 ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
Nov 27 16:34:18.598 INFO [stderr]     |
Nov 27 16:34:18.598 INFO [stderr]     = note: this `Result` may be an `Err` variant, which should be handled
Nov 27 16:34:18.599 INFO [stderr]     = note: this error originates in a macro outside of the current crate (in Nightly builds, run with -Z external-macro-backtrace for more info)
Nov 27 16:34:18.599 INFO [stderr] 
Nov 27 16:34:18.599 INFO [stderr] warning: unused `std::result::Result` that must be used
Nov 27 16:34:18.599 INFO [stderr]    --> src/chunk.rs:152:9
Nov 27 16:34:18.599 INFO [stderr]     |
Nov 27 16:34:18.599 INFO [stderr] 152 |         writeln!(write_to, "{}", name);
Nov 27 16:34:18.599 INFO [stderr]     |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
Nov 27 16:34:18.599 INFO [stderr]     |
Nov 27 16:34:18.599 INFO [stderr]     = note: this `Result` may be an `Err` variant, which should be handled
Nov 27 16:34:18.599 INFO [stderr]     = note: this error originates in a macro outside of the current crate (in Nightly builds, run with -Z external-macro-backtrace for more info)
Nov 27 16:34:18.599 INFO [stderr] 
Nov 27 16:34:18.606 INFO [stderr] warning: unused `std::result::Result` that must be used
Nov 27 16:34:18.606 INFO [stderr]    --> src/chunk.rs:163:9
Nov 27 16:34:18.606 INFO [stderr]     |
Nov 27 16:34:18.606 INFO [stderr] 163 |         write!(write_to, "{:<16} {:04} ", name, constant);
Nov 27 16:34:18.606 INFO [stderr]     |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
Nov 27 16:34:18.606 INFO [stderr]     |
Nov 27 16:34:18.606 INFO [stderr]     = note: this `Result` may be an `Err` variant, which should be handled
Nov 27 16:34:18.606 INFO [stderr]     = note: this error originates in a macro outside of the current crate (in Nightly builds, run with -Z external-macro-backtrace for more info)
Nov 27 16:34:18.606 INFO [stderr] 
Nov 27 16:34:18.606 INFO [stderr] warning: unused `std::result::Result` that must be used
Nov 27 16:34:18.606 INFO [stderr]    --> src/chunk.rs:164:9
Nov 27 16:34:18.606 INFO [stderr]     |
Nov 27 16:34:18.606 INFO [stderr] 164 |         writeln!(write_to, "{}", self.constants[constant as usize]);
Nov 27 16:34:18.606 INFO [stderr]     |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
Nov 27 16:34:18.606 INFO [stderr]     |
Nov 27 16:34:18.606 INFO [stderr]     = note: this `Result` may be an `Err` variant, which should be handled
Nov 27 16:34:18.606 INFO [stderr]     = note: this error originates in a macro outside of the current crate (in Nightly builds, run with -Z external-macro-backtrace for more info)
Nov 27 16:34:18.606 INFO [stderr] 
Nov 27 16:34:18.616 INFO [stderr] warning: unused `std::result::Result` that must be used
Nov 27 16:34:18.616 INFO [stderr]    --> src/vm.rs:227:9
Nov 27 16:34:18.616 INFO [stderr]     |
Nov 27 16:34:18.617 INFO [stderr] 227 |         writeln!(self.output, "{}", v);
Nov 27 16:34:18.617 INFO [stderr]     |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
Nov 27 16:34:18.617 INFO [stderr]     |
Nov 27 16:34:18.617 INFO [stderr]     = note: this `Result` may be an `Err` variant, which should be handled
Nov 27 16:34:18.617 INFO [stderr]     = note: this error originates in a macro outside of the current crate (in Nightly builds, run with -Z external-macro-backtrace for more info)
Nov 27 16:34:18.617 INFO [stderr] 
Nov 27 16:34:18.619 INFO [stderr] warning: unused `std::result::Result` that must be used
Nov 27 16:34:18.619 INFO [stderr]   --> src/main.rs:38:13
Nov 27 16:34:18.619 INFO [stderr]    |
Nov 27 16:34:18.619 INFO [stderr] 38 |             vm.interpret();
Nov 27 16:34:18.619 INFO [stderr]    |             ^^^^^^^^^^^^^^^
Nov 27 16:34:18.619 INFO [stderr]    |
Nov 27 16:34:18.619 INFO [stderr]    = note: this `Result` may be an `Err` variant, which should be handled
Nov 27 16:34:18.619 INFO [stderr] 
Nov 27 16:34:18.678 INFO [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 26.95s
Nov 27 16:34:18.684 INFO [stderr] su: No module specific data is present
Nov 27 16:34:19.345 INFO running `"docker" "inspect" "643f1390a304ad61dba18adc6c6cfc80e350304526aff151d1df59edc14e074c"`
Nov 27 16:34:19.581 INFO running `"docker" "rm" "-f" "643f1390a304ad61dba18adc6c6cfc80e350304526aff151d1df59edc14e074c"`
Nov 27 16:34:19.820 INFO [stdout] 643f1390a304ad61dba18adc6c6cfc80e350304526aff151d1df59edc14e074c