[INFO] crate nero 0.0.1 is already in cache [INFO] extracting crate nero 0.0.1 into work/ex/pr-62849/sources/master#435236b8877cdb98c82eaebfb7887782277265c5/reg/nero/0.0.1 [INFO] extracting crate nero 0.0.1 into work/ex/pr-62849/sources/try#b5c7f157c20453dde8d47371abe73b32351b4e7f/reg/nero/0.0.1 [INFO] validating manifest of nero-0.0.1 on toolchain master#435236b8877cdb98c82eaebfb7887782277265c5 [INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+435236b8877cdb98c82eaebfb7887782277265c5-alt" "read-manifest" "--manifest-path" "Cargo.toml"` [INFO] validating manifest of nero-0.0.1 on toolchain try#b5c7f157c20453dde8d47371abe73b32351b4e7f [INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+b5c7f157c20453dde8d47371abe73b32351b4e7f-alt" "read-manifest" "--manifest-path" "Cargo.toml"` [INFO] started frobbing nero-0.0.1 [INFO] finished frobbing nero-0.0.1 [INFO] frobbed toml for nero-0.0.1 written to work/ex/pr-62849/sources/master#435236b8877cdb98c82eaebfb7887782277265c5/reg/nero/0.0.1/Cargo.toml [INFO] started frobbing nero-0.0.1 [INFO] finished frobbing nero-0.0.1 [INFO] frobbed toml for nero-0.0.1 written to work/ex/pr-62849/sources/try#b5c7f157c20453dde8d47371abe73b32351b4e7f/reg/nero/0.0.1/Cargo.toml [INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+435236b8877cdb98c82eaebfb7887782277265c5-alt" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update"` [INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+b5c7f157c20453dde8d47371abe73b32351b4e7f-alt" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update"` [INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+435236b8877cdb98c82eaebfb7887782277265c5-alt" "fetch" "--locked" "--manifest-path" "Cargo.toml"` [INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+b5c7f157c20453dde8d47371abe73b32351b4e7f-alt" "fetch" "--locked" "--manifest-path" "Cargo.toml"` [INFO] checking nero-0.0.1 against try#b5c7f157c20453dde8d47371abe73b32351b4e7f for pr-62849 [INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/pr-62849/worker-0/try#b5c7f157c20453dde8d47371abe73b32351b4e7f:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/pr-62849/sources/try#b5c7f157c20453dde8d47371abe73b32351b4e7f/reg/nero/0.0.1:/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" "+b5c7f157c20453dde8d47371abe73b32351b4e7f-alt" "check" "--frozen" "--all" "--all-targets"` [INFO] [stdout] 7115332d941a22f84afbcdbf53b74f9860413e4c27eabc3ef7d661bcb8dd6baa [INFO] running `"docker" "start" "-a" "7115332d941a22f84afbcdbf53b74f9860413e4c27eabc3ef7d661bcb8dd6baa"` [INFO] [stderr] Checking nero v0.0.1 (/opt/crater/workdir) [INFO] [stderr] warning: trait objects without an explicit `dyn` are deprecated [INFO] [stderr] --> src/config.rs:30:45 [INFO] [stderr] | [INFO] [stderr] 30 | pub fn get_protocol() -> Result> { [INFO] [stderr] | ^^^^^^^^^^^^^^^^^^^ help: use `dyn`: `dyn (::std::error::Error)` [INFO] [stderr] | [INFO] [stderr] = note: `#[warn(bare_trait_objects)]` on by default [INFO] [stderr] [INFO] [stderr] warning: trait objects without an explicit `dyn` are deprecated [INFO] [stderr] --> src/net.rs:107:49 [INFO] [stderr] | [INFO] [stderr] 107 | pub fn boot(handle: Handle) -> Box> { [INFO] [stderr] | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: use `dyn`: `dyn Future` [INFO] [stderr] [INFO] [stderr] warning: `...` range patterns are deprecated [INFO] [stderr] --> src/p10.rs:467:30 [INFO] [stderr] | [INFO] [stderr] 467 | b'0' ... b'9' => oplevel = 999, // TODO: Parse this [INFO] [stderr] | ^^^ help: use `..=` for an inclusive range [INFO] [stderr] | [INFO] [stderr] = note: `#[warn(ellipsis_inclusive_range_patterns)]` on by default [INFO] [stderr] [INFO] [stderr] warning: `...` range patterns are deprecated [INFO] [stderr] --> src/p10.rs:503:22 [INFO] [stderr] | [INFO] [stderr] 503 | b'0' ... b'9' => oplevel = 999, // TODO: Parse this [INFO] [stderr] | ^^^ help: use `..=` for an inclusive range [INFO] [stderr] [INFO] [stderr] warning: `...` range patterns are deprecated [INFO] [stderr] --> src/p10.rs:802:38 [INFO] [stderr] | [INFO] [stderr] 802 | b'0' ... b'9' => { [INFO] [stderr] | ^^^ help: use `..=` for an inclusive range [INFO] [stderr] [INFO] [stderr] warning: trait objects without an explicit `dyn` are deprecated [INFO] [stderr] --> src/plugin.rs:3:40 [INFO] [stderr] | [INFO] [stderr] 3 | pub type LoadFunc = fn() -> Result, ()>; [INFO] [stderr] | ^^^^^^ help: use `dyn`: `dyn Plugin` [INFO] [stderr] [INFO] [stderr] warning: trait objects without an explicit `dyn` are deprecated [INFO] [stderr] --> src/plugin.rs:5:25 [INFO] [stderr] | [INFO] [stderr] 5 | pub type HookFunc = Box]) -> Result>>, HookError>>; [INFO] [stderr] | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: use `dyn`: `dyn FnMut(&mut Plugin, &[u8], usize, &[Vec]) -> Result>>, HookError>` [INFO] [stderr] [INFO] [stderr] warning: trait objects without an explicit `dyn` are deprecated [INFO] [stderr] --> src/plugin.rs:5:36 [INFO] [stderr] | [INFO] [stderr] 5 | pub type HookFunc = Box]) -> Result>>, HookError>>; [INFO] [stderr] | ^^^^^^ help: use `dyn`: `dyn Plugin` [INFO] [stderr] [INFO] [stderr] warning: trait objects without an explicit `dyn` are deprecated [INFO] [stderr] --> src/plugin.rs:31:28 [INFO] [stderr] | [INFO] [stderr] 31 | pub plugin_ptr: *const Plugin, [INFO] [stderr] | ^^^^^^ help: use `dyn`: `dyn Plugin` [INFO] [stderr] [INFO] [stderr] warning: trait objects without an explicit `dyn` are deprecated [INFO] [stderr] --> src/plugin.rs:45:6 [INFO] [stderr] | [INFO] [stderr] 45 | impl Plugin { [INFO] [stderr] | ^^^^^^ help: use `dyn`: `dyn Plugin` [INFO] [stderr] [INFO] [stderr] warning: trait objects without an explicit `dyn` are deprecated [INFO] [stderr] --> src/plugin.rs:49:42 [INFO] [stderr] | [INFO] [stderr] 49 | Some(&mut *(self as *mut Plugin as *mut T)) [INFO] [stderr] | ^^^^^^ help: use `dyn`: `dyn Plugin` [INFO] [stderr] [INFO] [stderr] warning: trait objects without an explicit `dyn` are deprecated [INFO] [stderr] --> src/plugin_handler.rs:9:17 [INFO] [stderr] | [INFO] [stderr] 9 | plugin: Box [INFO] [stderr] | ^^^^^^ help: use `dyn`: `dyn Plugin` [INFO] [stderr] [INFO] [stderr] warning: trait objects without an explicit `dyn` are deprecated [INFO] [stderr] --> src/plugin_handler.rs:42:19 [INFO] [stderr] | [INFO] [stderr] 42 | type Target = Plugin; [INFO] [stderr] | ^^^^^^ help: use `dyn`: `dyn Plugin` [INFO] [stderr] [INFO] [stderr] warning: use of deprecated item 'futures::BoxFuture': removed without replacement, recommended to use a local extension trait or function if needed, more details in https://github.com/rust-lang-nursery/futures-rs/issues/228 [INFO] [stderr] --> src/net.rs:9:15 [INFO] [stderr] | [INFO] [stderr] 9 | use futures::{BoxFuture, Future}; [INFO] [stderr] | ^^^^^^^^^ [INFO] [stderr] | [INFO] [stderr] = note: `#[warn(deprecated)]` on by default [INFO] [stderr] [INFO] [stderr] warning: use of deprecated item 'futures::BoxFuture': removed without replacement, recommended to use a local extension trait or function if needed, more details in https://github.com/rust-lang-nursery/futures-rs/issues/228 [INFO] [stderr] --> src/net.rs:70:33 [INFO] [stderr] | [INFO] [stderr] 70 | pub fn write_lines(self) -> BoxFuture { [INFO] [stderr] | ^^^^^^^^^^^^^^^^^^^^^^^^^^ [INFO] [stderr] [INFO] [stderr] warning: use of deprecated item 'std::ascii::AsciiExt': use inherent methods instead [INFO] [stderr] --> src/p10.rs:885:9 [INFO] [stderr] | [INFO] [stderr] 885 | use std::ascii::AsciiExt; [INFO] [stderr] | ^^^^^^^^^^^^^^^^^^^^ [INFO] [stderr] [INFO] [stderr] warning: trait objects without an explicit `dyn` are deprecated [INFO] [stderr] --> src/config.rs:30:45 [INFO] [stderr] | [INFO] [stderr] 30 | pub fn get_protocol() -> Result> { [INFO] [stderr] | ^^^^^^^^^^^^^^^^^^^ help: use `dyn`: `dyn (::std::error::Error)` [INFO] [stderr] | [INFO] [stderr] = note: `#[warn(bare_trait_objects)]` on by default [INFO] [stderr] [INFO] [stderr] warning: trait objects without an explicit `dyn` are deprecated [INFO] [stderr] --> src/net.rs:107:49 [INFO] [stderr] | [INFO] [stderr] 107 | pub fn boot(handle: Handle) -> Box> { [INFO] [stderr] | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: use `dyn`: `dyn Future` [INFO] [stderr] [INFO] [stderr] warning: `...` range patterns are deprecated [INFO] [stderr] --> src/p10.rs:467:30 [INFO] [stderr] | [INFO] [stderr] 467 | b'0' ... b'9' => oplevel = 999, // TODO: Parse this [INFO] [stderr] | ^^^ help: use `..=` for an inclusive range [INFO] [stderr] | [INFO] [stderr] = note: `#[warn(ellipsis_inclusive_range_patterns)]` on by default [INFO] [stderr] [INFO] [stderr] warning: `...` range patterns are deprecated [INFO] [stderr] --> src/p10.rs:503:22 [INFO] [stderr] | [INFO] [stderr] 503 | b'0' ... b'9' => oplevel = 999, // TODO: Parse this [INFO] [stderr] | ^^^ help: use `..=` for an inclusive range [INFO] [stderr] [INFO] [stderr] warning: `...` range patterns are deprecated [INFO] [stderr] --> src/p10.rs:802:38 [INFO] [stderr] | [INFO] [stderr] 802 | b'0' ... b'9' => { [INFO] [stderr] | ^^^ help: use `..=` for an inclusive range [INFO] [stderr] [INFO] [stderr] warning: trait objects without an explicit `dyn` are deprecated [INFO] [stderr] --> src/plugin.rs:3:40 [INFO] [stderr] | [INFO] [stderr] 3 | pub type LoadFunc = fn() -> Result, ()>; [INFO] [stderr] | ^^^^^^ help: use `dyn`: `dyn Plugin` [INFO] [stderr] [INFO] [stderr] warning: trait objects without an explicit `dyn` are deprecated [INFO] [stderr] --> src/plugin.rs:5:25 [INFO] [stderr] | [INFO] [stderr] 5 | pub type HookFunc = Box]) -> Result>>, HookError>>; [INFO] [stderr] | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: use `dyn`: `dyn FnMut(&mut Plugin, &[u8], usize, &[Vec]) -> Result>>, HookError>` [INFO] [stderr] [INFO] [stderr] warning: trait objects without an explicit `dyn` are deprecated [INFO] [stderr] --> src/plugin.rs:5:36 [INFO] [stderr] | [INFO] [stderr] 5 | pub type HookFunc = Box]) -> Result>>, HookError>>; [INFO] [stderr] | ^^^^^^ help: use `dyn`: `dyn Plugin` [INFO] [stderr] [INFO] [stderr] warning: trait objects without an explicit `dyn` are deprecated [INFO] [stderr] --> src/plugin.rs:31:28 [INFO] [stderr] | [INFO] [stderr] 31 | pub plugin_ptr: *const Plugin, [INFO] [stderr] | ^^^^^^ help: use `dyn`: `dyn Plugin` [INFO] [stderr] [INFO] [stderr] warning: trait objects without an explicit `dyn` are deprecated [INFO] [stderr] --> src/plugin.rs:45:6 [INFO] [stderr] | [INFO] [stderr] 45 | impl Plugin { [INFO] [stderr] | ^^^^^^ help: use `dyn`: `dyn Plugin` [INFO] [stderr] [INFO] [stderr] warning: trait objects without an explicit `dyn` are deprecated [INFO] [stderr] --> src/plugin.rs:49:42 [INFO] [stderr] | [INFO] [stderr] 49 | Some(&mut *(self as *mut Plugin as *mut T)) [INFO] [stderr] | ^^^^^^ help: use `dyn`: `dyn Plugin` [INFO] [stderr] [INFO] [stderr] warning: trait objects without an explicit `dyn` are deprecated [INFO] [stderr] --> src/plugin_handler.rs:9:17 [INFO] [stderr] | [INFO] [stderr] 9 | plugin: Box [INFO] [stderr] | ^^^^^^ help: use `dyn`: `dyn Plugin` [INFO] [stderr] [INFO] [stderr] warning: trait objects without an explicit `dyn` are deprecated [INFO] [stderr] --> src/plugin_handler.rs:42:19 [INFO] [stderr] | [INFO] [stderr] 42 | type Target = Plugin; [INFO] [stderr] | ^^^^^^ help: use `dyn`: `dyn Plugin` [INFO] [stderr] [INFO] [stderr] warning: use of deprecated item 'futures::BoxFuture': removed without replacement, recommended to use a local extension trait or function if needed, more details in https://github.com/rust-lang-nursery/futures-rs/issues/228 [INFO] [stderr] --> src/net.rs:9:15 [INFO] [stderr] | [INFO] [stderr] 9 | use futures::{BoxFuture, Future}; [INFO] [stderr] | ^^^^^^^^^ [INFO] [stderr] | [INFO] [stderr] = note: `#[warn(deprecated)]` on by default [INFO] [stderr] [INFO] [stderr] warning: use of deprecated item 'futures::BoxFuture': removed without replacement, recommended to use a local extension trait or function if needed, more details in https://github.com/rust-lang-nursery/futures-rs/issues/228 [INFO] [stderr] --> src/net.rs:70:33 [INFO] [stderr] | [INFO] [stderr] 70 | pub fn write_lines(self) -> BoxFuture { [INFO] [stderr] | ^^^^^^^^^^^^^^^^^^^^^^^^^^ [INFO] [stderr] [INFO] [stderr] warning: use of deprecated item 'std::ascii::AsciiExt': use inherent methods instead [INFO] [stderr] --> src/p10.rs:885:9 [INFO] [stderr] | [INFO] [stderr] 885 | use std::ascii::AsciiExt; [INFO] [stderr] | ^^^^^^^^^^^^^^^^^^^^ [INFO] [stderr] [INFO] [stderr] warning: use of deprecated item 'futures::Future::boxed': removed without replacement, recommended to use a local extension trait or function if needed, more details in https://github.com/rust-lang-nursery/futures-rs/issues/228 [INFO] [stderr] --> src/net.rs:83:24 [INFO] [stderr] | [INFO] [stderr] 83 | }).boxed() [INFO] [stderr] | ^^^^^ [INFO] [stderr] [INFO] [stderr] warning: use of deprecated item 'futures::Future::boxed': removed without replacement, recommended to use a local extension trait or function if needed, more details in https://github.com/rust-lang-nursery/futures-rs/issues/228 [INFO] [stderr] --> src/net.rs:87:87 [INFO] [stderr] | [INFO] [stderr] 87 | ok(Loop::Break(WriteState { messages: messages.into(), writer })).boxed() [INFO] [stderr] | ^^^^^ [INFO] [stderr] [INFO] [stderr] warning: use of deprecated item 'futures::Future::boxed': removed without replacement, recommended to use a local extension trait or function if needed, more details in https://github.com/rust-lang-nursery/futures-rs/issues/228 [INFO] [stderr] --> src/net.rs:90:12 [INFO] [stderr] | [INFO] [stderr] 90 | }).boxed() [INFO] [stderr] | ^^^^^ [INFO] [stderr] [INFO] [stderr] warning: use of deprecated item 'futures::Future::boxed': removed without replacement, recommended to use a local extension trait or function if needed, more details in https://github.com/rust-lang-nursery/futures-rs/issues/228 [INFO] [stderr] --> src/net.rs:83:24 [INFO] [stderr] | [INFO] [stderr] 83 | }).boxed() [INFO] [stderr] | ^^^^^ [INFO] [stderr] [INFO] [stderr] warning: use of deprecated item 'futures::Future::boxed': removed without replacement, recommended to use a local extension trait or function if needed, more details in https://github.com/rust-lang-nursery/futures-rs/issues/228 [INFO] [stderr] --> src/net.rs:87:87 [INFO] [stderr] | [INFO] [stderr] 87 | ok(Loop::Break(WriteState { messages: messages.into(), writer })).boxed() [INFO] [stderr] | ^^^^^ [INFO] [stderr] [INFO] [stderr] warning: use of deprecated item 'futures::Future::boxed': removed without replacement, recommended to use a local extension trait or function if needed, more details in https://github.com/rust-lang-nursery/futures-rs/issues/228 [INFO] [stderr] --> src/net.rs:90:12 [INFO] [stderr] | [INFO] [stderr] 90 | }).boxed() [INFO] [stderr] | ^^^^^ [INFO] [stderr] [INFO] [stderr] warning: unused import: `std::ascii::AsciiExt` [INFO] [stderr] --> src/p10.rs:885:9 [INFO] [stderr] | [INFO] [stderr] 885 | use std::ascii::AsciiExt; [INFO] [stderr] | ^^^^^^^^^^^^^^^^^^^^ [INFO] [stderr] | [INFO] [stderr] = note: `#[warn(unused_imports)]` on by default [INFO] [stderr] [INFO] [stderr] warning: unused import: `std::ascii::AsciiExt` [INFO] [stderr] --> src/p10.rs:885:9 [INFO] [stderr] | [INFO] [stderr] 885 | use std::ascii::AsciiExt; [INFO] [stderr] | ^^^^^^^^^^^^^^^^^^^^ [INFO] [stderr] | [INFO] [stderr] = note: `#[warn(unused_imports)]` on by default [INFO] [stderr] [INFO] [stderr] warning: variable does not need to be mutable [INFO] [stderr] --> src/core_data.rs:83:13 [INFO] [stderr] | [INFO] [stderr] 83 | for mut event in &mut self.events { [INFO] [stderr] | ----^^^^^ [INFO] [stderr] | | [INFO] [stderr] | help: remove this `mut` [INFO] [stderr] | [INFO] [stderr] = note: `#[warn(unused_mut)]` on by default [INFO] [stderr] [INFO] [stderr] warning: variable does not need to be mutable [INFO] [stderr] --> src/core_data.rs:85:21 [INFO] [stderr] | [INFO] [stderr] 85 | let mut plugin = self.plugins.iter_mut().filter(|x| ptr::eq(&***x, event.plugin_ptr)).next().unwrap(); [INFO] [stderr] | ----^^^^^^ [INFO] [stderr] | | [INFO] [stderr] | help: remove this `mut` [INFO] [stderr] [INFO] [stderr] warning: variable does not need to be mutable [INFO] [stderr] --> src/core_data.rs:83:13 [INFO] [stderr] | [INFO] [stderr] 83 | for mut event in &mut self.events { [INFO] [stderr] | ----^^^^^ [INFO] [stderr] | | [INFO] [stderr] | help: remove this `mut` [INFO] [stderr] | [INFO] [stderr] = note: `#[warn(unused_mut)]` on by default [INFO] [stderr] [INFO] [stderr] warning: variable does not need to be mutable [INFO] [stderr] --> src/core_data.rs:85:21 [INFO] [stderr] | [INFO] [stderr] 85 | let mut plugin = self.plugins.iter_mut().filter(|x| ptr::eq(&***x, event.plugin_ptr)).next().unwrap(); [INFO] [stderr] | ----^^^^^^ [INFO] [stderr] | | [INFO] [stderr] | help: remove this `mut` [INFO] [stderr] [INFO] [stderr] warning[E0382]: assign to part of moved value: `server` [INFO] [stderr] --> src/p10.rs:321:33 [INFO] [stderr] | [INFO] [stderr] 278 | let mut server: Server = Server::::new(&argv[1], &argv[8]); [INFO] [stderr] | ---------- move occurs because `server` has type `server::Server`, which does not implement the `Copy` trait [INFO] [stderr] ... [INFO] [stderr] 314 | let shared_server = Rc::new(RefCell::new(server)); [INFO] [stderr] | ------ value moved here [INFO] [stderr] ... [INFO] [stderr] 321 | Some(arc_server) => server.uplink = Some(arc_server.clone()), [INFO] [stderr] | ^^^^^^^^^^^^^ value partially assigned here after move [INFO] [stderr] | [INFO] [stderr] = warning: this error has been downgraded to a warning for backwards compatibility with previous releases [INFO] [stderr] = warning: this represents potential undefined behavior in your code and this warning will become a hard error in the future [INFO] [stderr] = note: for more information, try `rustc --explain E0729` [INFO] [stderr] [INFO] [stderr] warning[E0382]: assign to part of moved value: `server` [INFO] [stderr] --> src/p10.rs:321:33 [INFO] [stderr] | [INFO] [stderr] 278 | let mut server: Server = Server::::new(&argv[1], &argv[8]); [INFO] [stderr] | ---------- move occurs because `server` has type `server::Server`, which does not implement the `Copy` trait [INFO] [stderr] ... [INFO] [stderr] 314 | let shared_server = Rc::new(RefCell::new(server)); [INFO] [stderr] | ------ value moved here [INFO] [stderr] ... [INFO] [stderr] 321 | Some(arc_server) => server.uplink = Some(arc_server.clone()), [INFO] [stderr] | ^^^^^^^^^^^^^ value partially assigned here after move [INFO] [stderr] | [INFO] [stderr] = warning: this error has been downgraded to a warning for backwards compatibility with previous releases [INFO] [stderr] = warning: this represents potential undefined behavior in your code and this warning will become a hard error in the future [INFO] [stderr] = note: for more information, try `rustc --explain E0729` [INFO] [stderr] [INFO] [stderr] warning: variable does not need to be mutable [INFO] [stderr] --> src/p10.rs:888:9 [INFO] [stderr] | [INFO] [stderr] 888 | for mut byte in &mut buf { [INFO] [stderr] | ----^^^^ [INFO] [stderr] | | [INFO] [stderr] | help: remove this `mut` [INFO] [stderr] [INFO] [stderr] warning: variable does not need to be mutable [INFO] [stderr] --> src/p10.rs:888:9 [INFO] [stderr] | [INFO] [stderr] 888 | for mut byte in &mut buf { [INFO] [stderr] | ----^^^^ [INFO] [stderr] | | [INFO] [stderr] | help: remove this `mut` [INFO] [stderr] [INFO] [stderr] Finished dev [unoptimized + debuginfo] target(s) in 6.59s [INFO] running `"docker" "inspect" "7115332d941a22f84afbcdbf53b74f9860413e4c27eabc3ef7d661bcb8dd6baa"` [INFO] running `"docker" "rm" "-f" "7115332d941a22f84afbcdbf53b74f9860413e4c27eabc3ef7d661bcb8dd6baa"` [INFO] [stdout] 7115332d941a22f84afbcdbf53b74f9860413e4c27eabc3ef7d661bcb8dd6baa