[INFO] cloning repository https://github.com/Applimu/Metallic
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/Applimu/Metallic" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FApplimu%2FMetallic", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FApplimu%2FMetallic'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 26924c5e5ca0d99c6e7ad3d410d4c616b5f41f22
[INFO] checking Applimu/Metallic against try#4f260f0f20b3133d20cfb50353c0221943af5796+rustflags=-Dunmustuse_in_always_ok for pr-148577
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FApplimu%2FMetallic" "/workspace/builds/worker-2-tc2/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-2-tc2/source'...
[INFO] [stderr] done.
[INFO] started tweaking git repo https://github.com/Applimu/Metallic
[INFO] finished tweaking git repo https://github.com/Applimu/Metallic
[INFO] tweaked toml for git repo https://github.com/Applimu/Metallic written to /workspace/builds/worker-2-tc2/source/Cargo.toml
[INFO] validating manifest of git repo https://github.com/Applimu/Metallic on toolchain 4f260f0f20b3133d20cfb50353c0221943af5796
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+4f260f0f20b3133d20cfb50353c0221943af5796" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] crate git repo https://github.com/Applimu/Metallic 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" "+4f260f0f20b3133d20cfb50353c0221943af5796" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-2-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-2-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@sha256:4848fb76d95f26979359cc7e45710b1dbc8f3acb7aeedee7c460d7702230f228" "/opt/rustwide/cargo-home/bin/cargo" "+4f260f0f20b3133d20cfb50353c0221943af5796" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] bda26526c7adb301d099c8e67600ab204c9b377a82e6bfafdf98d3dcf977cd7b
[INFO] running `Command { std: "docker" "start" "-a" "bda26526c7adb301d099c8e67600ab204c9b377a82e6bfafdf98d3dcf977cd7b", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "bda26526c7adb301d099c8e67600ab204c9b377a82e6bfafdf98d3dcf977cd7b", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "bda26526c7adb301d099c8e67600ab204c9b377a82e6bfafdf98d3dcf977cd7b", kill_on_drop: false }`
[INFO] [stdout] bda26526c7adb301d099c8e67600ab204c9b377a82e6bfafdf98d3dcf977cd7b
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-2-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-2-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 -Dunmustuse_in_always_ok" "-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@sha256:4848fb76d95f26979359cc7e45710b1dbc8f3acb7aeedee7c460d7702230f228" "/opt/rustwide/cargo-home/bin/cargo" "+4f260f0f20b3133d20cfb50353c0221943af5796" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 46c12f6dfc44bb5008f19ef2ae42a6e2656a520f38eb5896cec8c0da199f8e80
[INFO] running `Command { std: "docker" "start" "-a" "46c12f6dfc44bb5008f19ef2ae42a6e2656a520f38eb5896cec8c0da199f8e80", kill_on_drop: false }`
[INFO] [stderr]     Checking metallic v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: unused variable: `t`
[INFO] [stdout]    --> src/runtime.rs:212:49
[INFO] [stdout]     |
[INFO] [stdout] 212 | ...                   let t = args[0].get_as_type()?;
[INFO] [stdout]     |                           ^ help: if this is intentional, prefix it with an underscore: `_t`
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unused_variables)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `t`
[INFO] [stdout]    --> src/runtime.rs:216:49
[INFO] [stdout]     |
[INFO] [stdout] 216 | ...                   let t = args[0].get_as_type()?;
[INFO] [stdout]     |                           ^ help: if this is intentional, prefix it with an underscore: `_t`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `f`
[INFO] [stdout]    --> src/runtime.rs:313:56
[INFO] [stdout]     |
[INFO] [stdout] 313 |             Val::Function(Function::PartialApplication(f, args)) => {
[INFO] [stdout]     |                                                        ^ help: if this is intentional, prefix it with an underscore: `_f`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `args`
[INFO] [stdout]    --> src/runtime.rs:313:59
[INFO] [stdout]     |
[INFO] [stdout] 313 |             Val::Function(Function::PartialApplication(f, args)) => {
[INFO] [stdout]     |                                                           ^^^^ help: if this is intentional, prefix it with an underscore: `_args`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `branches`
[INFO] [stdout]    --> src/runtime.rs:426:17
[INFO] [stdout]     |
[INFO] [stdout] 426 |                 branches,
[INFO] [stdout]     |                 ^^^^^^^^ help: try ignoring the field: `branches: _`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unreachable pattern
[INFO] [stdout]    --> src/main.rs:174:13
[INFO] [stdout]     |
[INFO] [stdout] 160 |             Igetln => FunctionType(
[INFO] [stdout]     |             ------ matches all the relevant values
[INFO] [stdout] ...
[INFO] [stdout] 174 |             Igetln => FunctionType(
[INFO] [stdout]     |             ^^^^^^ no value can reach this
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unreachable_patterns)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unreachable pattern
[INFO] [stdout]    --> src/main.rs:178:13
[INFO] [stdout]     |
[INFO] [stdout] 164 |             Iprintln => FunctionType(Rc::new(String), Rc::new(IO)),
[INFO] [stdout]     |             -------- matches all the relevant values
[INFO] [stdout] ...
[INFO] [stdout] 178 |             Iprintln => FunctionType(Rc::new(String), Rc::new(IO)),
[INFO] [stdout]     |             ^^^^^^^^ no value can reach this
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `run_io_action` is never used
[INFO] [stdout]   --> src/runtime.rs:39:4
[INFO] [stdout]    |
[INFO] [stdout] 39 | fn run_io_action(ctx: &mut Context, action: &IOAction) -> Result<(), RuntimeError> {
[INFO] [stdout]    |    ^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(dead_code)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: method `get_as_pair` is never used
[INFO] [stdout]    --> src/runtime.rs:293:8
[INFO] [stdout]     |
[INFO] [stdout] 241 | impl Val {
[INFO] [stdout]     | -------- method in this implementation
[INFO] [stdout] ...
[INFO] [stdout] 293 |     fn get_as_pair(&self) -> Result<(Rc<Val>, Rc<Val>), RuntimeError> {
[INFO] [stdout]     |        ^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: method `display_val` is never used
[INFO] [stdout]    --> src/runtime.rs:447:8
[INFO] [stdout]     |
[INFO] [stdout] 335 | impl<'a> Context<'a> {
[INFO] [stdout]     | -------------------- method in this implementation
[INFO] [stdout] ...
[INFO] [stdout] 447 |     fn display_val(&self, val: &Val) -> String {
[INFO] [stdout]     |        ^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `interpret_program` is never used
[INFO] [stdout]    --> src/runtime.rs:545:8
[INFO] [stdout]     |
[INFO] [stdout] 545 | pub fn interpret_program(prog: &Program) -> Vec<Result<Rc<Val>, RuntimeError>> {
[INFO] [stdout]     |        ^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: this type will no longer be must used: Result<String, Infallible>
[INFO] [stdout]    --> src/runtime.rs:451:26
[INFO] [stdout]     |
[INFO] [stdout] 451 |             Val::Unit => String::from_str("()").unwrap(),
[INFO] [stdout]     |                          ^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: requested on the command line with `-D unmustuse-in-always-ok`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `metallic` (bin "metallic") due to 1 previous error; 11 warnings emitted
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[INFO] [stdout] warning: unused variable: `t`
[INFO] [stdout]    --> src/runtime.rs:212:49
[INFO] [stdout]     |
[INFO] [stdout] 212 | ...                   let t = args[0].get_as_type()?;
[INFO] [stdout]     |                           ^ help: if this is intentional, prefix it with an underscore: `_t`
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unused_variables)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `t`
[INFO] [stdout]    --> src/runtime.rs:216:49
[INFO] [stdout]     |
[INFO] [stdout] 216 | ...                   let t = args[0].get_as_type()?;
[INFO] [stdout]     |                           ^ help: if this is intentional, prefix it with an underscore: `_t`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `f`
[INFO] [stdout]    --> src/runtime.rs:313:56
[INFO] [stdout]     |
[INFO] [stdout] 313 |             Val::Function(Function::PartialApplication(f, args)) => {
[INFO] [stdout]     |                                                        ^ help: if this is intentional, prefix it with an underscore: `_f`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `args`
[INFO] [stdout]    --> src/runtime.rs:313:59
[INFO] [stdout]     |
[INFO] [stdout] 313 |             Val::Function(Function::PartialApplication(f, args)) => {
[INFO] [stdout]     |                                                           ^^^^ help: if this is intentional, prefix it with an underscore: `_args`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `branches`
[INFO] [stdout]    --> src/runtime.rs:426:17
[INFO] [stdout]     |
[INFO] [stdout] 426 |                 branches,
[INFO] [stdout]     |                 ^^^^^^^^ help: try ignoring the field: `branches: _`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unreachable pattern
[INFO] [stdout]    --> src/main.rs:174:13
[INFO] [stdout]     |
[INFO] [stdout] 160 |             Igetln => FunctionType(
[INFO] [stdout]     |             ------ matches all the relevant values
[INFO] [stdout] ...
[INFO] [stdout] 174 |             Igetln => FunctionType(
[INFO] [stdout]     |             ^^^^^^ no value can reach this
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unreachable_patterns)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unreachable pattern
[INFO] [stdout]    --> src/main.rs:178:13
[INFO] [stdout]     |
[INFO] [stdout] 164 |             Iprintln => FunctionType(Rc::new(String), Rc::new(IO)),
[INFO] [stdout]     |             -------- matches all the relevant values
[INFO] [stdout] ...
[INFO] [stdout] 178 |             Iprintln => FunctionType(Rc::new(String), Rc::new(IO)),
[INFO] [stdout]     |             ^^^^^^^^ no value can reach this
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function `run_io_action` is never used
[INFO] [stdout]   --> src/runtime.rs:39:4
[INFO] [stdout]    |
[INFO] [stdout] 39 | fn run_io_action(ctx: &mut Context, action: &IOAction) -> Result<(), RuntimeError> {
[INFO] [stdout]    |    ^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(dead_code)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: method `get_as_pair` is never used
[INFO] [stdout]    --> src/runtime.rs:293:8
[INFO] [stdout]     |
[INFO] [stdout] 241 | impl Val {
[INFO] [stdout]     | -------- method in this implementation
[INFO] [stdout] ...
[INFO] [stdout] 293 |     fn get_as_pair(&self) -> Result<(Rc<Val>, Rc<Val>), RuntimeError> {
[INFO] [stdout]     |        ^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: method `display_val` is never used
[INFO] [stdout]    --> src/runtime.rs:447:8
[INFO] [stdout]     |
[INFO] [stdout] 335 | impl<'a> Context<'a> {
[INFO] [stdout]     | -------------------- method in this implementation
[INFO] [stdout] ...
[INFO] [stdout] 447 |     fn display_val(&self, val: &Val) -> String {
[INFO] [stdout]     |        ^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `metallic` (bin "metallic" test) due to 1 previous error; 10 warnings emitted
[INFO] [stdout] error: this type will no longer be must used: Result<String, Infallible>
[INFO] [stdout]    --> src/runtime.rs:451:26
[INFO] [stdout]     |
[INFO] [stdout] 451 |             Val::Unit => String::from_str("()").unwrap(),
[INFO] [stdout]     |                          ^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: requested on the command line with `-D unmustuse-in-always-ok`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] running `Command { std: "docker" "inspect" "46c12f6dfc44bb5008f19ef2ae42a6e2656a520f38eb5896cec8c0da199f8e80", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "46c12f6dfc44bb5008f19ef2ae42a6e2656a520f38eb5896cec8c0da199f8e80", kill_on_drop: false }`
[INFO] [stdout] 46c12f6dfc44bb5008f19ef2ae42a6e2656a520f38eb5896cec8c0da199f8e80
