[INFO] crate moore-common 0.6.0 is already in cache
[INFO] checking moore-common-0.6.0 against try#e4dba30b9b475d8750370c4dfb49b6541990904d for pr-71393
[INFO] extracting crate moore-common 0.6.0 into /workspace/builds/worker-4/source
[INFO] validating manifest of crates.io crate moore-common 0.6.0 on toolchain e4dba30b9b475d8750370c4dfb49b6541990904d
[INFO] running `"/workspace/cargo-home/bin/cargo" "+e4dba30b9b475d8750370c4dfb49b6541990904d" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] started tweaking crates.io crate moore-common 0.6.0
[INFO] finished tweaking crates.io crate moore-common 0.6.0
[INFO] tweaked toml for crates.io crate moore-common 0.6.0 written to /workspace/builds/worker-4/source/Cargo.toml
[INFO] running `"/workspace/cargo-home/bin/cargo" "+e4dba30b9b475d8750370c4dfb49b6541990904d" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update"`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] running `"/workspace/cargo-home/bin/cargo" "+e4dba30b9b475d8750370c4dfb49b6541990904d" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] running `"docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-4/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-4/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" "MAP_USER_ID=0" "-e" "CARGO_TARGET_DIR=/opt/rustwide/target" "-e" "CARGO_INCREMENTAL=0" "-e" "RUST_BACKTRACE=full" "-e" "RUSTFLAGS=--cap-lints=forbid" "-e" "CARGO_HOME=/opt/rustwide/cargo-home" "-e" "RUSTUP_HOME=/opt/rustwide/rustup-home" "-w" "/opt/rustwide/workdir" "-m" "1610612736" "--network" "none" "rustops/crates-build-env" "/opt/rustwide/cargo-home/bin/cargo" "+e4dba30b9b475d8750370c4dfb49b6541990904d" "check" "--frozen" "--all" "--all-targets"`
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] [stdout] 3bfe16820e19f6cac5cef56b2a98cd0f9c955699e13a8ac5108d83304002b01a
[INFO] running `"docker" "start" "-a" "3bfe16820e19f6cac5cef56b2a98cd0f9c955699e13a8ac5108d83304002b01a"`
[INFO] [stderr]    Compiling libc v0.2.69
[INFO] [stderr]    Compiling bitflags v1.2.1
[INFO] [stderr]    Compiling serde v1.0.106
[INFO] [stderr]     Checking typed-arena v1.7.0
[INFO] [stderr]     Checking rustc-serialize v0.3.24
[INFO] [stderr]    Compiling slog v2.5.2
[INFO] [stderr]     Checking memmap v0.5.2
[INFO] [stderr]     Checking moore-common v0.6.0 (/opt/rustwide/workdir)
[INFO] [stderr] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stderr]   --> arenas.rs:16:58
[INFO] [stderr]    |
[INFO] [stderr] 16 | impl<'z, 'a, 'p: 'a, 't, T: 't> Alloc<'z, 't, T> for &'p Alloc<'a, 't, T> {
[INFO] [stderr]    |                                                          ^^^^^^^^^^^^^^^^ help: use `dyn`: `dyn Alloc<'a, 't, T>`
[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]   --> arenas.rs:87:68
[INFO] [stderr]    |
[INFO] [stderr] 87 | impl<'a, 't, T: ToOwned<Owned = T> + 't> AllocOwned<'a, 't, T> for Alloc<'a, 't, T> {
[INFO] [stderr]    |                                                                    ^^^^^^^^^^^^^^^^ help: use `dyn`: `dyn Alloc<'a, 't, T>`
[INFO] [stderr] 
[INFO] [stderr] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stderr]    --> grind/mod.rs:128:47
[INFO] [stderr]     |
[INFO] [stderr] 128 | impl<I, C: Chisel<Value = I>, E> Iterator for Grinder<Item = C, Error = E> {
[INFO] [stderr]     |                                               ^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: use `dyn`: `dyn Grinder<Item = C, Error = E>`
[INFO] [stderr] 
[INFO] [stderr] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stderr]   --> lexer.rs:24:13
[INFO] [stderr]    |
[INFO] [stderr] 24 |     rd: Box<Read>,
[INFO] [stderr]    |             ^^^^ help: use `dyn`: `dyn Read`
[INFO] [stderr] 
[INFO] [stderr] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stderr]   --> lexer.rs:32:24
[INFO] [stderr]    |
[INFO] [stderr] 32 |     pub fn new(rd: Box<Read>) -> AccumulatingReader {
[INFO] [stderr]    |                        ^^^^ help: use `dyn`: `dyn Read`
[INFO] [stderr] 
[INFO] [stderr] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stderr]    --> lexer.rs:142:15
[INFO] [stderr]     |
[INFO] [stderr] 142 |     iter: Box<Iterator<Item = char> + 'tdata>,
[INFO] [stderr]     |               ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: use `dyn`: `dyn Iterator<Item = char> + 'tdata`
[INFO] [stderr] 
[INFO] [stderr] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stderr]    --> lexer.rs:242:20
[INFO] [stderr]     |
[INFO] [stderr] 242 |     stack: Vec<Box<Lexer<T>>>,
[INFO] [stderr]     |                    ^^^^^^^^ help: use `dyn`: `dyn Lexer<T>`
[INFO] [stderr] 
[INFO] [stderr] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stderr]    --> lexer.rs:254:39
[INFO] [stderr]     |
[INFO] [stderr] 254 |     pub fn push(&mut self, lexer: Box<Lexer<T>>) {
[INFO] [stderr]     |                                       ^^^^^^^^ help: use `dyn`: `dyn Lexer<T>`
[INFO] [stderr] 
[INFO] [stderr] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stderr]    --> lexer.rs:280:16
[INFO] [stderr]     |
[INFO] [stderr] 280 |     inner: Box<Lexer<T>>,
[INFO] [stderr]     |                ^^^^^^^^ help: use `dyn`: `dyn Lexer<T>`
[INFO] [stderr] 
[INFO] [stderr] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stderr]    --> lexer.rs:288:27
[INFO] [stderr]     |
[INFO] [stderr] 288 |     pub fn new(inner: Box<Lexer<T>>, eof: T) -> BufferedLexer<T> {
[INFO] [stderr]     |                           ^^^^^^^^ help: use `dyn`: `dyn Lexer<T>`
[INFO] [stderr] 
[INFO] [stderr] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stderr]    --> lexer.rs:339:29
[INFO] [stderr]     |
[INFO] [stderr] 339 |     pub fn inner(&self) -> &Lexer<T> {
[INFO] [stderr]     |                             ^^^^^^^^ help: use `dyn`: `dyn Lexer<T>`
[INFO] [stderr] 
[INFO] [stderr] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stderr]    --> lexer.rs:343:41
[INFO] [stderr]     |
[INFO] [stderr] 343 |     pub fn inner_mut(&mut self) -> &mut Lexer<T> {
[INFO] [stderr]     |                                         ^^^^^^^^ help: use `dyn`: `dyn Lexer<T>`
[INFO] [stderr] 
[INFO] [stderr] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stderr]   --> source.rs:40:36
[INFO] [stderr]    |
[INFO] [stderr] 40 |     pub fn get_content(self) -> Rc<SourceContent> {
[INFO] [stderr]    |                                    ^^^^^^^^^^^^^ help: use `dyn`: `dyn SourceContent`
[INFO] [stderr] 
[INFO] [stderr] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stderr]    --> source.rs:101:33
[INFO] [stderr]     |
[INFO] [stderr] 101 |     fn get_content(&self) -> Rc<SourceContent>;
[INFO] [stderr]     |                                 ^^^^^^^^^^^^^ help: use `dyn`: `dyn SourceContent`
[INFO] [stderr] 
[INFO] [stderr] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stderr]    --> source.rs:139:27
[INFO] [stderr]     |
[INFO] [stderr] 139 |     vect: RefCell<Vec<Box<SourceFile>>>,
[INFO] [stderr]     |                           ^^^^^^^^^^ help: use `dyn`: `dyn SourceFile`
[INFO] [stderr] 
[INFO] [stderr] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stderr]    --> source.rs:153:20
[INFO] [stderr]     |
[INFO] [stderr] 153 |         F: FnOnce(&SourceFile) -> R,
[INFO] [stderr]     |                    ^^^^^^^^^^ help: use `dyn`: `dyn SourceFile`
[INFO] [stderr] 
[INFO] [stderr] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stderr]    --> source.rs:266:33
[INFO] [stderr]     |
[INFO] [stderr] 266 |     fn get_content(&self) -> Rc<SourceContent> {
[INFO] [stderr]     |                                 ^^^^^^^^^^^^^ help: use `dyn`: `dyn SourceContent`
[INFO] [stderr] 
[INFO] [stderr] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stderr]    --> source.rs:312:33
[INFO] [stderr]     |
[INFO] [stderr] 312 |     fn get_content(&self) -> Rc<SourceContent> {
[INFO] [stderr]     |                                 ^^^^^^^^^^^^^ help: use `dyn`: `dyn SourceContent`
[INFO] [stderr] 
[INFO] [stderr] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stderr]    --> source.rs:369:25
[INFO] [stderr]     |
[INFO] [stderr] 369 | pub type CharIter<'a> = DoubleEndedIterator<Item = (usize, char)> + 'a;
[INFO] [stderr]     |                         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: use `dyn`: `dyn DoubleEndedIterator<Item = (usize, char)> + 'a`
[INFO] [stderr] 
[INFO] [stderr] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stderr]    --> source.rs:388:43
[INFO] [stderr]     |
[INFO] [stderr] 388 |     pub fn iter<'a>(self, content: &'a Rc<SourceContent>) -> Box<CharIter<'a>> {
[INFO] [stderr]     |                                           ^^^^^^^^^^^^^ help: use `dyn`: `dyn SourceContent`
[INFO] [stderr] 
[INFO] [stderr] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stderr]    --> source.rs:521:43
[INFO] [stderr]     |
[INFO] [stderr] 521 |     pub fn iter<'a>(self, content: &'a Rc<SourceContent>) -> Box<CharIter<'a>> {
[INFO] [stderr]     |                                           ^^^^^^^^^^^^^ help: use `dyn`: `dyn SourceContent`
[INFO] [stderr] 
[INFO] [stderr] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stderr]   --> arenas.rs:16:58
[INFO] [stderr]    |
[INFO] [stderr] 16 | impl<'z, 'a, 'p: 'a, 't, T: 't> Alloc<'z, 't, T> for &'p Alloc<'a, 't, T> {
[INFO] [stderr]    |                                                          ^^^^^^^^^^^^^^^^ help: use `dyn`: `dyn Alloc<'a, 't, T>`
[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]   --> arenas.rs:87:68
[INFO] [stderr]    |
[INFO] [stderr] 87 | impl<'a, 't, T: ToOwned<Owned = T> + 't> AllocOwned<'a, 't, T> for Alloc<'a, 't, T> {
[INFO] [stderr]    |                                                                    ^^^^^^^^^^^^^^^^ help: use `dyn`: `dyn Alloc<'a, 't, T>`
[INFO] [stderr] 
[INFO] [stderr] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stderr]    --> grind/mod.rs:128:47
[INFO] [stderr]     |
[INFO] [stderr] 128 | impl<I, C: Chisel<Value = I>, E> Iterator for Grinder<Item = C, Error = E> {
[INFO] [stderr]     |                                               ^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: use `dyn`: `dyn Grinder<Item = C, Error = E>`
[INFO] [stderr] 
[INFO] [stderr] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stderr]   --> lexer.rs:24:13
[INFO] [stderr]    |
[INFO] [stderr] 24 |     rd: Box<Read>,
[INFO] [stderr]    |             ^^^^ help: use `dyn`: `dyn Read`
[INFO] [stderr] 
[INFO] [stderr] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stderr]   --> lexer.rs:32:24
[INFO] [stderr]    |
[INFO] [stderr] 32 |     pub fn new(rd: Box<Read>) -> AccumulatingReader {
[INFO] [stderr]    |                        ^^^^ help: use `dyn`: `dyn Read`
[INFO] [stderr] 
[INFO] [stderr] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stderr]    --> lexer.rs:142:15
[INFO] [stderr]     |
[INFO] [stderr] 142 |     iter: Box<Iterator<Item = char> + 'tdata>,
[INFO] [stderr]     |               ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: use `dyn`: `dyn Iterator<Item = char> + 'tdata`
[INFO] [stderr] 
[INFO] [stderr] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stderr]    --> lexer.rs:242:20
[INFO] [stderr]     |
[INFO] [stderr] 242 |     stack: Vec<Box<Lexer<T>>>,
[INFO] [stderr]     |                    ^^^^^^^^ help: use `dyn`: `dyn Lexer<T>`
[INFO] [stderr] 
[INFO] [stderr] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stderr]    --> lexer.rs:254:39
[INFO] [stderr]     |
[INFO] [stderr] 254 |     pub fn push(&mut self, lexer: Box<Lexer<T>>) {
[INFO] [stderr]     |                                       ^^^^^^^^ help: use `dyn`: `dyn Lexer<T>`
[INFO] [stderr] 
[INFO] [stderr] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stderr]    --> lexer.rs:280:16
[INFO] [stderr]     |
[INFO] [stderr] 280 |     inner: Box<Lexer<T>>,
[INFO] [stderr]     |                ^^^^^^^^ help: use `dyn`: `dyn Lexer<T>`
[INFO] [stderr] 
[INFO] [stderr] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stderr]    --> lexer.rs:288:27
[INFO] [stderr]     |
[INFO] [stderr] 288 |     pub fn new(inner: Box<Lexer<T>>, eof: T) -> BufferedLexer<T> {
[INFO] [stderr]     |                           ^^^^^^^^ help: use `dyn`: `dyn Lexer<T>`
[INFO] [stderr] 
[INFO] [stderr] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stderr]    --> lexer.rs:339:29
[INFO] [stderr]     |
[INFO] [stderr] 339 |     pub fn inner(&self) -> &Lexer<T> {
[INFO] [stderr]     |                             ^^^^^^^^ help: use `dyn`: `dyn Lexer<T>`
[INFO] [stderr] 
[INFO] [stderr] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stderr]    --> lexer.rs:343:41
[INFO] [stderr]     |
[INFO] [stderr] 343 |     pub fn inner_mut(&mut self) -> &mut Lexer<T> {
[INFO] [stderr]     |                                         ^^^^^^^^ help: use `dyn`: `dyn Lexer<T>`
[INFO] [stderr] 
[INFO] [stderr] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stderr]   --> source.rs:40:36
[INFO] [stderr]    |
[INFO] [stderr] 40 |     pub fn get_content(self) -> Rc<SourceContent> {
[INFO] [stderr]    |                                    ^^^^^^^^^^^^^ help: use `dyn`: `dyn SourceContent`
[INFO] [stderr] 
[INFO] [stderr] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stderr]    --> source.rs:101:33
[INFO] [stderr]     |
[INFO] [stderr] 101 |     fn get_content(&self) -> Rc<SourceContent>;
[INFO] [stderr]     |                                 ^^^^^^^^^^^^^ help: use `dyn`: `dyn SourceContent`
[INFO] [stderr] 
[INFO] [stderr] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stderr]    --> source.rs:139:27
[INFO] [stderr]     |
[INFO] [stderr] 139 |     vect: RefCell<Vec<Box<SourceFile>>>,
[INFO] [stderr]     |                           ^^^^^^^^^^ help: use `dyn`: `dyn SourceFile`
[INFO] [stderr] 
[INFO] [stderr] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stderr]    --> source.rs:153:20
[INFO] [stderr]     |
[INFO] [stderr] 153 |         F: FnOnce(&SourceFile) -> R,
[INFO] [stderr]     |                    ^^^^^^^^^^ help: use `dyn`: `dyn SourceFile`
[INFO] [stderr] 
[INFO] [stderr] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stderr]    --> source.rs:266:33
[INFO] [stderr]     |
[INFO] [stderr] 266 |     fn get_content(&self) -> Rc<SourceContent> {
[INFO] [stderr]     |                                 ^^^^^^^^^^^^^ help: use `dyn`: `dyn SourceContent`
[INFO] [stderr] 
[INFO] [stderr] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stderr]    --> source.rs:312:33
[INFO] [stderr]     |
[INFO] [stderr] 312 |     fn get_content(&self) -> Rc<SourceContent> {
[INFO] [stderr]     |                                 ^^^^^^^^^^^^^ help: use `dyn`: `dyn SourceContent`
[INFO] [stderr] 
[INFO] [stderr] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stderr]    --> source.rs:369:25
[INFO] [stderr]     |
[INFO] [stderr] 369 | pub type CharIter<'a> = DoubleEndedIterator<Item = (usize, char)> + 'a;
[INFO] [stderr]     |                         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: use `dyn`: `dyn DoubleEndedIterator<Item = (usize, char)> + 'a`
[INFO] [stderr] 
[INFO] [stderr] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stderr]    --> source.rs:388:43
[INFO] [stderr]     |
[INFO] [stderr] 388 |     pub fn iter<'a>(self, content: &'a Rc<SourceContent>) -> Box<CharIter<'a>> {
[INFO] [stderr]     |                                           ^^^^^^^^^^^^^ help: use `dyn`: `dyn SourceContent`
[INFO] [stderr] 
[INFO] [stderr] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stderr]    --> source.rs:521:43
[INFO] [stderr]     |
[INFO] [stderr] 521 |     pub fn iter<'a>(self, content: &'a Rc<SourceContent>) -> Box<CharIter<'a>> {
[INFO] [stderr]     |                                           ^^^^^^^^^^^^^ help: use `dyn`: `dyn SourceContent`
[INFO] [stderr] 
[INFO] [stderr] warning: use of deprecated item 'std::sync::atomic::ATOMIC_USIZE_INIT': the `new` function is now preferred
[INFO] [stderr]  --> id.rs:2:48
[INFO] [stderr]   |
[INFO] [stderr] 2 | use std::sync::atomic::{AtomicUsize, Ordering, ATOMIC_USIZE_INIT};
[INFO] [stderr]   |                                                ^^^^^^^^^^^^^^^^^
[INFO] [stderr]   |
[INFO] [stderr]   = note: `#[warn(deprecated)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: use of deprecated item 'std::sync::atomic::ATOMIC_USIZE_INIT': the `new` function is now preferred
[INFO] [stderr]   --> id.rs:20:39
[INFO] [stderr]    |
[INFO] [stderr] 20 |         static NEXT_ID: AtomicUsize = ATOMIC_USIZE_INIT;
[INFO] [stderr]    |                                       ^^^^^^^^^^^^^^^^^ help: replace the use of the deprecated item: `AtomicUsize::new(0)`
[INFO] [stderr] 
[INFO] [stderr] warning: use of deprecated item 'std::sync::atomic::ATOMIC_USIZE_INIT': the `new` function is now preferred
[INFO] [stderr]  --> id.rs:2:48
[INFO] [stderr]   |
[INFO] [stderr] 2 | use std::sync::atomic::{AtomicUsize, Ordering, ATOMIC_USIZE_INIT};
[INFO] [stderr]   |                                                ^^^^^^^^^^^^^^^^^
[INFO] [stderr]   |
[INFO] [stderr]   = note: `#[warn(deprecated)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: use of deprecated item 'std::sync::atomic::ATOMIC_USIZE_INIT': the `new` function is now preferred
[INFO] [stderr]   --> id.rs:20:39
[INFO] [stderr]    |
[INFO] [stderr] 20 |         static NEXT_ID: AtomicUsize = ATOMIC_USIZE_INIT;
[INFO] [stderr]    |                                       ^^^^^^^^^^^^^^^^^ help: replace the use of the deprecated item: `AtomicUsize::new(0)`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `iter`
[INFO] [stderr]    --> errors.rs:195:25
[INFO] [stderr]     |
[INFO] [stderr] 195 |                     let mut iter = c.extract_iter(0, sp.begin);
[INFO] [stderr]     |                         ^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_iter`
[INFO] [stderr]     |
[INFO] [stderr]     = note: `#[warn(unused_variables)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `iter`
[INFO] [stderr]    --> errors.rs:195:25
[INFO] [stderr]     |
[INFO] [stderr] 195 |                     let mut iter = c.extract_iter(0, sp.begin);
[INFO] [stderr]     |                         ^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_iter`
[INFO] [stderr]     |
[INFO] [stderr]     = note: `#[warn(unused_variables)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: variable does not need to be mutable
[INFO] [stderr]    --> errors.rs:195:25
[INFO] [stderr]     |
[INFO] [stderr] 195 |                     let mut iter = c.extract_iter(0, sp.begin);
[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]    --> errors.rs:195:25
[INFO] [stderr]     |
[INFO] [stderr] 195 |                     let mut iter = c.extract_iter(0, sp.begin);
[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: 25 warnings emitted
[INFO] [stderr] 
[INFO] [stderr] warning: 25 warnings emitted
[INFO] [stderr] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 10.23s
[INFO] running `"docker" "inspect" "3bfe16820e19f6cac5cef56b2a98cd0f9c955699e13a8ac5108d83304002b01a"`
[INFO] running `"docker" "rm" "-f" "3bfe16820e19f6cac5cef56b2a98cd0f9c955699e13a8ac5108d83304002b01a"`
[INFO] [stdout] 3bfe16820e19f6cac5cef56b2a98cd0f9c955699e13a8ac5108d83304002b01a