[INFO] cloning repository https://github.com/leona-art/lern-rust-lang
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/leona-art/lern-rust-lang" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fleona-art%2Flern-rust-lang", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fleona-art%2Flern-rust-lang'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] dce510f69728d8b2187b9c254c211e209f9a3f46
[INFO] checking leona-art/lern-rust-lang against try#e5b0618d996a6a3941e423fd3e170737b8dbdc92 for pr-151822
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fleona-art%2Flern-rust-lang" "/workspace/builds/worker-7-tc2/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-7-tc2/source'...
[INFO] [stderr] done.
[INFO] started tweaking git repo https://github.com/leona-art/lern-rust-lang
[INFO] finished tweaking git repo https://github.com/leona-art/lern-rust-lang
[INFO] tweaked toml for git repo https://github.com/leona-art/lern-rust-lang written to /workspace/builds/worker-7-tc2/source/Cargo.toml
[INFO] validating manifest of git repo https://github.com/leona-art/lern-rust-lang on toolchain e5b0618d996a6a3941e423fd3e170737b8dbdc92
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+e5b0618d996a6a3941e423fd3e170737b8dbdc92" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] crate git repo https://github.com/leona-art/lern-rust-lang 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" "+e5b0618d996a6a3941e423fd3e170737b8dbdc92" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-7-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-7-tc2/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@sha256:29356a839a4d14451438f794ce8414e707d72405f44418718d724d22562fe786" "/opt/rustwide/cargo-home/bin/cargo" "+e5b0618d996a6a3941e423fd3e170737b8dbdc92" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 7cf90c7bdba8389d7aa5af62f8766cba53bb15061d64e77c612519143f64278c
[INFO] running `Command { std: "docker" "start" "-a" "7cf90c7bdba8389d7aa5af62f8766cba53bb15061d64e77c612519143f64278c", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "7cf90c7bdba8389d7aa5af62f8766cba53bb15061d64e77c612519143f64278c", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "7cf90c7bdba8389d7aa5af62f8766cba53bb15061d64e77c612519143f64278c", kill_on_drop: false }`
[INFO] [stdout] 7cf90c7bdba8389d7aa5af62f8766cba53bb15061d64e77c612519143f64278c
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-7-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-7-tc2/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@sha256:29356a839a4d14451438f794ce8414e707d72405f44418718d724d22562fe786" "/opt/rustwide/cargo-home/bin/cargo" "+e5b0618d996a6a3941e423fd3e170737b8dbdc92" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 2531dccf041a86bf5a4b554158927aed255e0fa027a3be68e2b4b788403f254b
[INFO] running `Command { std: "docker" "start" "-a" "2531dccf041a86bf5a4b554158927aed255e0fa027a3be68e2b4b788403f254b", kill_on_drop: false }`
[INFO] [stderr]     Checking lern-rust-lang v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: type `vm` should have an upper camel case name
[INFO] [stdout]    --> src/virtual_machine_basics.rs:521:12
[INFO] [stdout]     |
[INFO] [stdout] 521 |     struct vm<'src>{
[INFO] [stdout]     |            ^^ help: convert the identifier to upper camel case (notice the capitalization): `Vm`
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(non_camel_case_types)]` (part of `#[warn(nonstandard_style)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: type `vm` should have an upper camel case name
[INFO] [stdout]    --> src/virtual_machine_basics.rs:521:12
[INFO] [stdout]     |
[INFO] [stdout] 521 |     struct vm<'src>{
[INFO] [stdout]     |            ^^ help: convert the identifier to upper camel case (notice the capitalization): `Vm`
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(non_camel_case_types)]` (part of `#[warn(nonstandard_style)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unreachable pattern
[INFO] [stdout]    --> src/virtual_machine_basics.rs:239:17
[INFO] [stdout]     |
[INFO] [stdout] 239 |                 _ => {}
[INFO] [stdout]     |                 ^ no value can reach this
[INFO] [stdout]     |
[INFO] [stdout] note: multiple earlier patterns match some of the same values
[INFO] [stdout]    --> src/virtual_machine_basics.rs:239:17
[INFO] [stdout]     |
[INFO] [stdout] 235 |                 Value::Number(n) => result.push(Value::Number(*n)), 
[INFO] [stdout]     |                 ---------------- matches some of the same values
[INFO] [stdout] 236 |                 Value::Operator(Op::Add) => add(&mut result), 
[INFO] [stdout]     |                 ------------------------ matches some of the same values
[INFO] [stdout] 237 |                 Value::Operator(Op::Sub) => sub(&mut result), 
[INFO] [stdout]     |                 ------------------------ matches some of the same values
[INFO] [stdout] 238 |                 Value::Block(block) => result.push(Value::Block(block.clone())), // ブロックはそのままスタックに追加
[INFO] [stdout]     |                 ------------------- matches some of the same values
[INFO] [stdout] 239 |                 _ => {}
[INFO] [stdout]     |                 ^ collectively making this unreachable
[INFO] [stdout]     = note: `#[warn(unreachable_patterns)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `line`
[INFO] [stdout]    --> src/virtual_machine_basics.rs:527:18
[INFO] [stdout]     |
[INFO] [stdout] 527 |     fn parse<'a>(line:&'a str)->Vec<Value>{
[INFO] [stdout]     |                  ^^^^ help: if this is intentional, prefix it with an underscore: `_line`
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unused_variables)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `push` is never used
[INFO] [stdout]   --> src/virtual_machine_basics.rs:10:8
[INFO] [stdout]    |
[INFO] [stdout] 10 |     fn push(stack: &mut Vec<i32>, value: i32) {
[INFO] [stdout]    |        ^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(dead_code)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `add` is never used
[INFO] [stdout]   --> src/virtual_machine_basics.rs:14:8
[INFO] [stdout]    |
[INFO] [stdout] 14 |     fn add(stack: &mut Vec<i32>) {
[INFO] [stdout]    |        ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `read` is never used
[INFO] [stdout]   --> src/virtual_machine_basics.rs:53:8
[INFO] [stdout]    |
[INFO] [stdout] 53 |     fn read(input: &str) -> String {
[INFO] [stdout]    |        ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: enum `Operator` is never used
[INFO] [stdout]   --> src/virtual_machine_basics.rs:71:10
[INFO] [stdout]    |
[INFO] [stdout] 71 |     enum Operator{
[INFO] [stdout]    |          ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: enum `Value` is never used
[INFO] [stdout]   --> src/virtual_machine_basics.rs:75:10
[INFO] [stdout]    |
[INFO] [stdout] 75 |     enum Value{
[INFO] [stdout]    |          ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `parse` is never used
[INFO] [stdout]   --> src/virtual_machine_basics.rs:80:8
[INFO] [stdout]    |
[INFO] [stdout] 80 |     fn parse(input: &str) -> Result<Vec<Value>, String> {
[INFO] [stdout]    |        ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `add` is never used
[INFO] [stdout]   --> src/virtual_machine_basics.rs:91:8
[INFO] [stdout]    |
[INFO] [stdout] 91 |     fn add(stack: &mut Vec<i32>) {
[INFO] [stdout]    |        ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `sub` is never used
[INFO] [stdout]   --> src/virtual_machine_basics.rs:99:8
[INFO] [stdout]    |
[INFO] [stdout] 99 |     fn sub(stack: &mut Vec<i32>) {
[INFO] [stdout]    |        ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `calc` is never used
[INFO] [stdout]    --> src/virtual_machine_basics.rs:108:8
[INFO] [stdout]     |
[INFO] [stdout] 108 |     fn calc(stack: &[Value]) -> Vec<i32> {
[INFO] [stdout]     |        ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: enum `Op` is never used
[INFO] [stdout]    --> src/virtual_machine_basics.rs:149:10
[INFO] [stdout]     |
[INFO] [stdout] 149 |     enum Op{
[INFO] [stdout]     |          ^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unreachable pattern
[INFO] [stdout]    --> src/virtual_machine_basics.rs:239:17
[INFO] [stdout]     |
[INFO] [stdout] 239 |                 _ => {}
[INFO] [stdout]     |                 ^ no value can reach this
[INFO] [stdout]     |
[INFO] [stdout] note: multiple earlier patterns match some of the same values
[INFO] [stdout]    --> src/virtual_machine_basics.rs:239:17
[INFO] [stdout]     |
[INFO] [stdout] 235 |                 Value::Number(n) => result.push(Value::Number(*n)), 
[INFO] [stdout]     |                 ---------------- matches some of the same values
[INFO] [stdout] 236 |                 Value::Operator(Op::Add) => add(&mut result), 
[INFO] [stdout]     |                 ------------------------ matches some of the same values
[INFO] [stdout] 237 |                 Value::Operator(Op::Sub) => sub(&mut result), 
[INFO] [stdout]     |                 ------------------------ matches some of the same values
[INFO] [stdout] 238 |                 Value::Block(block) => result.push(Value::Block(block.clone())), // ブロックはそのままスタックに追加
[INFO] [stdout]     |                 ------------------- matches some of the same values
[INFO] [stdout] 239 |                 _ => {}
[INFO] [stdout]     |                 ^ collectively making this unreachable
[INFO] [stdout]     = note: `#[warn(unreachable_patterns)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: enum `Value` is never used
[INFO] [stdout]    --> src/virtual_machine_basics.rs:154:10
[INFO] [stdout]     |
[INFO] [stdout] 154 |     enum Value{
[INFO] [stdout]     |          ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: method `display` is never used
[INFO] [stdout]    --> src/virtual_machine_basics.rs:161:12
[INFO] [stdout]     |
[INFO] [stdout] 160 |     impl Value {
[INFO] [stdout]     |     ---------- method in this implementation
[INFO] [stdout] 161 |         fn display(&self) -> String {
[INFO] [stdout]     |            ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `display` is never used
[INFO] [stdout]    --> src/virtual_machine_basics.rs:172:8
[INFO] [stdout]     |
[INFO] [stdout] 172 |     fn display(stack: &[Value]) -> String {
[INFO] [stdout]     |        ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `parse_block` is never used
[INFO] [stdout]    --> src/virtual_machine_basics.rs:176:8
[INFO] [stdout]     |
[INFO] [stdout] 176 |     fn parse_block<'a>(input: &'a[&'a str]) -> Result<(Vec<Value>, &'a [&'a str]), String> {
[INFO] [stdout]     |        ^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `add` is never used
[INFO] [stdout]    --> src/virtual_machine_basics.rs:203:8
[INFO] [stdout]     |
[INFO] [stdout] 203 |     fn add(stack: &mut Vec<Value>) {
[INFO] [stdout]     |        ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `sub` is never used
[INFO] [stdout]    --> src/virtual_machine_basics.rs:215:8
[INFO] [stdout]     |
[INFO] [stdout] 215 |     fn sub(stack: &mut Vec<Value>) {
[INFO] [stdout]     |        ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `tokenize` is never used
[INFO] [stdout]    --> src/virtual_machine_basics.rs:227:8
[INFO] [stdout]     |
[INFO] [stdout] 227 |     fn tokenize(input: &str) -> Vec<&str> {
[INFO] [stdout]     |        ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `calc` is never used
[INFO] [stdout]    --> src/virtual_machine_basics.rs:231:8
[INFO] [stdout]     |
[INFO] [stdout] 231 |     fn calc(stack: &[Value]) -> Vec<Value> {
[INFO] [stdout]     |        ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: enum `Value` is never used
[INFO] [stdout]    --> src/virtual_machine_basics.rs:272:10
[INFO] [stdout]     |
[INFO] [stdout] 272 |     enum Value{
[INFO] [stdout]     |          ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: methods `to_block` and `as_num` are never used
[INFO] [stdout]    --> src/virtual_machine_basics.rs:280:12
[INFO] [stdout]     |
[INFO] [stdout] 278 |     impl Value{
[INFO] [stdout]     |     ---------- methods in this implementation
[INFO] [stdout] 279 |         /// valueをblockとして取り出すヘルパー関数
[INFO] [stdout] 280 |         fn to_block(&self) -> Vec<Value> {
[INFO] [stdout]     |            ^^^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 287 |         fn as_num(&self) -> i32 {
[INFO] [stdout]     |            ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `display` is never used
[INFO] [stdout]    --> src/virtual_machine_basics.rs:294:8
[INFO] [stdout]     |
[INFO] [stdout] 294 |     fn display(stack: &[Value]) -> String {
[INFO] [stdout]     |        ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: enum `Op` is never used
[INFO] [stdout]    --> src/virtual_machine_basics.rs:308:10
[INFO] [stdout]     |
[INFO] [stdout] 308 |     enum Op{
[INFO] [stdout]     |          ^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `add` is never used
[INFO] [stdout]    --> src/virtual_machine_basics.rs:331:8
[INFO] [stdout]     |
[INFO] [stdout] 331 |     fn add(stack: &mut Vec<Value>) {
[INFO] [stdout]     |        ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `sub` is never used
[INFO] [stdout]    --> src/virtual_machine_basics.rs:343:8
[INFO] [stdout]     |
[INFO] [stdout] 343 |     fn sub(stack: &mut Vec<Value>) {
[INFO] [stdout]     |        ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `mul` is never used
[INFO] [stdout]    --> src/virtual_machine_basics.rs:355:8
[INFO] [stdout]     |
[INFO] [stdout] 355 |     fn mul(stack: &mut Vec<Value>) {
[INFO] [stdout]     |        ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `div` is never used
[INFO] [stdout]    --> src/virtual_machine_basics.rs:367:8
[INFO] [stdout]     |
[INFO] [stdout] 367 |     fn div(stack: &mut Vec<Value>) {
[INFO] [stdout]     |        ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `op_if` is never used
[INFO] [stdout]    --> src/virtual_machine_basics.rs:382:8
[INFO] [stdout]     |
[INFO] [stdout] 382 |     fn op_if(stack: &mut Vec<Value>) {
[INFO] [stdout]     |        ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `eval` is never used
[INFO] [stdout]    --> src/virtual_machine_basics.rs:407:8
[INFO] [stdout]     |
[INFO] [stdout] 407 |     fn eval(code:Value,stack:&mut Vec<Value>){
[INFO] [stdout]     |        ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `parse` is never used
[INFO] [stdout]    --> src/virtual_machine_basics.rs:419:8
[INFO] [stdout]     |
[INFO] [stdout] 419 |     fn parse<'a>(input: &'a str) -> Result<Vec<Value>, String> {
[INFO] [stdout]     |        ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `parse_block` is never used
[INFO] [stdout]    --> src/virtual_machine_basics.rs:448:8
[INFO] [stdout]     |
[INFO] [stdout] 448 |     fn parse_block<'a>(input: &'a[&'a str]) -> Result<(Vec<Value>, &'a [&'a str]), String> {
[INFO] [stdout]     |        ^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: enum `Op` is never used
[INFO] [stdout]    --> src/virtual_machine_basics.rs:505:10
[INFO] [stdout]     |
[INFO] [stdout] 505 |     enum Op{
[INFO] [stdout]     |          ^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: enum `Value` is never used
[INFO] [stdout]    --> src/virtual_machine_basics.rs:513:10
[INFO] [stdout]     |
[INFO] [stdout] 513 |     enum Value<'src>{
[INFO] [stdout]     |          ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `vm` is never constructed
[INFO] [stdout]    --> src/virtual_machine_basics.rs:521:12
[INFO] [stdout]     |
[INFO] [stdout] 521 |     struct vm<'src>{
[INFO] [stdout]     |            ^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `parse` is never used
[INFO] [stdout]    --> src/virtual_machine_basics.rs:527:8
[INFO] [stdout]     |
[INFO] [stdout] 527 |     fn parse<'a>(line:&'a str)->Vec<Value>{
[INFO] [stdout]     |        ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: hiding a lifetime that's named elsewhere is confusing
[INFO] [stdout]    --> src/virtual_machine_basics.rs:527:37
[INFO] [stdout]     |
[INFO] [stdout] 527 |     fn parse<'a>(line:&'a str)->Vec<Value>{
[INFO] [stdout]     |                        --           ^^^^^ the same lifetime is hidden here
[INFO] [stdout]     |                        |
[INFO] [stdout]     |                        the lifetime is named here
[INFO] [stdout]     |
[INFO] [stdout]     = help: the same lifetime is referred to in inconsistent ways, making the signature confusing
[INFO] [stdout]     = note: `#[warn(mismatched_lifetime_syntaxes)]` on by default
[INFO] [stdout] help: consistently use `'a`
[INFO] [stdout]     |
[INFO] [stdout] 527 |     fn parse<'a>(line:&'a str)->Vec<Value<'a>>{
[INFO] [stdout]     |                                          ++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `line`
[INFO] [stdout]    --> src/virtual_machine_basics.rs:527:18
[INFO] [stdout]     |
[INFO] [stdout] 527 |     fn parse<'a>(line:&'a str)->Vec<Value>{
[INFO] [stdout]     |                  ^^^^ help: if this is intentional, prefix it with an underscore: `_line`
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unused_variables)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: enum `Op` is never used
[INFO] [stdout]    --> src/virtual_machine_basics.rs:505:10
[INFO] [stdout]     |
[INFO] [stdout] 505 |     enum Op{
[INFO] [stdout]     |          ^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(dead_code)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: enum `Value` is never used
[INFO] [stdout]    --> src/virtual_machine_basics.rs:513:10
[INFO] [stdout]     |
[INFO] [stdout] 513 |     enum Value<'src>{
[INFO] [stdout]     |          ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `vm` is never constructed
[INFO] [stdout]    --> src/virtual_machine_basics.rs:521:12
[INFO] [stdout]     |
[INFO] [stdout] 521 |     struct vm<'src>{
[INFO] [stdout]     |            ^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `parse` is never used
[INFO] [stdout]    --> src/virtual_machine_basics.rs:527:8
[INFO] [stdout]     |
[INFO] [stdout] 527 |     fn parse<'a>(line:&'a str)->Vec<Value>{
[INFO] [stdout]     |        ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: hiding a lifetime that's named elsewhere is confusing
[INFO] [stdout]    --> src/virtual_machine_basics.rs:527:37
[INFO] [stdout]     |
[INFO] [stdout] 527 |     fn parse<'a>(line:&'a str)->Vec<Value>{
[INFO] [stdout]     |                        --           ^^^^^ the same lifetime is hidden here
[INFO] [stdout]     |                        |
[INFO] [stdout]     |                        the lifetime is named here
[INFO] [stdout]     |
[INFO] [stdout]     = help: the same lifetime is referred to in inconsistent ways, making the signature confusing
[INFO] [stdout]     = note: `#[warn(mismatched_lifetime_syntaxes)]` on by default
[INFO] [stdout] help: consistently use `'a`
[INFO] [stdout]     |
[INFO] [stdout] 527 |     fn parse<'a>(line:&'a str)->Vec<Value<'a>>{
[INFO] [stdout]     |                                          ++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished `dev` profile [unoptimized + debuginfo] target(s) in 0.18s
[INFO] running `Command { std: "docker" "inspect" "2531dccf041a86bf5a4b554158927aed255e0fa027a3be68e2b4b788403f254b", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "2531dccf041a86bf5a4b554158927aed255e0fa027a3be68e2b4b788403f254b", kill_on_drop: false }`
[INFO] [stdout] 2531dccf041a86bf5a4b554158927aed255e0fa027a3be68e2b4b788403f254b