[INFO] cloning repository https://github.com/strout/worthy-opponent
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/strout/worthy-opponent" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fstrout%2Fworthy-opponent", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fstrout%2Fworthy-opponent'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 9b3b0dcc7fbcb179cbb98e0a1e789c200c480147
[INFO] checking strout/worthy-opponent against try#09eeb2bacb9b40b2ed1d47f03177442c0632cda1 for pr-157710
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fstrout%2Fworthy-opponent" "/workspace/builds/worker-1-tc2/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-1-tc2/source'...
[INFO] [stderr] done.
[INFO] started tweaking git repo https://github.com/strout/worthy-opponent
[INFO] finished tweaking git repo https://github.com/strout/worthy-opponent
[INFO] tweaked toml for git repo https://github.com/strout/worthy-opponent written to /workspace/builds/worker-1-tc2/source/Cargo.toml
[INFO] validating manifest of git repo https://github.com/strout/worthy-opponent on toolchain 09eeb2bacb9b40b2ed1d47f03177442c0632cda1
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+09eeb2bacb9b40b2ed1d47f03177442c0632cda1" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] crate git repo https://github.com/strout/worthy-opponent 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" "+09eeb2bacb9b40b2ed1d47f03177442c0632cda1" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr] warning: Cargo.toml: `package.edition` is unspecified, defaulting to `2015` while the latest is `2024`
[INFO] [stderr] warning: `worthy-opponent` (manifest) generated 1 warning
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-1-tc2/source:/opt/rustwide/workdir:ro,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-1-tc2/target:/opt/rustwide/target:rw,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" "-m" "1610612736" "--network" "none" "ghcr.io/rust-lang/crates-build-env/linux@sha256:3a6becf2bc8dde7f3fa57ede90e4f284e72d296796fc446bbb1e2c7cc0530151" "sleep" "infinity", kill_on_drop: false }`
[INFO] [stdout] 8e9536cb343ece2eaad79138e9e5af512b803153e8b9cf84e37a4c45414a4bc4
[INFO] running `Command { std: "docker" "start" "8e9536cb343ece2eaad79138e9e5af512b803153e8b9cf84e37a4c45414a4bc4", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "exec" "-e" "SOURCE_DIR=/opt/rustwide/workdir" "-e" "CARGO_HOME=/opt/rustwide/cargo-home" "-e" "RUSTUP_HOME=/opt/rustwide/rustup-home" "-e" "CARGO_TARGET_DIR=/opt/rustwide/target" "-w" "/opt/rustwide/workdir" "--user" "0:0" "8e9536cb343ece2eaad79138e9e5af512b803153e8b9cf84e37a4c45414a4bc4" "/opt/rustwide/cargo-home/bin/cargo" "+09eeb2bacb9b40b2ed1d47f03177442c0632cda1" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "8e9536cb343ece2eaad79138e9e5af512b803153e8b9cf84e37a4c45414a4bc4", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "exec" "-e" "SOURCE_DIR=/opt/rustwide/workdir" "-e" "CARGO_HOME=/opt/rustwide/cargo-home" "-e" "RUSTUP_HOME=/opt/rustwide/rustup-home" "-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" "-w" "/opt/rustwide/workdir" "--user" "0:0" "8e9536cb343ece2eaad79138e9e5af512b803153e8b9cf84e37a4c45414a4bc4" "/opt/rustwide/cargo-home/bin/cargo" "+09eeb2bacb9b40b2ed1d47f03177442c0632cda1" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stderr] warning: Cargo.toml: `package.edition` is unspecified, defaulting to `2015` while the latest is `2024`
[INFO] [stderr] warning: `worthy-opponent` (manifest) generated 1 warning
[INFO] [stderr]    Compiling libc v0.2.46
[INFO] [stderr]    Compiling autocfg v0.1.1
[INFO] [stderr]    Compiling proc-macro2 v0.4.24
[INFO] [stderr]    Compiling cc v1.0.28
[INFO] [stderr]    Compiling num-integer v0.1.39
[INFO] [stderr]    Compiling serde v1.0.84
[INFO] [stderr]    Compiling memchr v2.1.2
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[INFO] [stderr]    Compiling rand v0.6.3
[INFO] [stderr]     Checking bit-vec v0.5.0
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[INFO] [stderr]     Checking rand v0.4.3
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[INFO] [stderr]     Checking worthy-opponent v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: anonymous parameters are deprecated and will be removed in the next edition
[INFO] [stdout]   --> src/game.rs:10:24
[INFO] [stdout]    |
[INFO] [stdout] 10 |     fn play(&mut self, &Self::Move);
[INFO] [stdout]    |                        ^^^^^^^^^^^ help: try naming the parameter or explicitly ignoring it: `_: &Self::Move`
[INFO] [stdout]    |
[INFO] [stdout]    = warning: this is accepted in the current edition (Rust 2015) but is a hard error in Rust 2018!
[INFO] [stdout]    = note: for more information, see <https://doc.rust-lang.org/edition-guide/rust-2018/trait-fn-parameters.html>
[INFO] [stdout]    = note: `#[warn(anonymous_parameters)]` (part of `#[warn(rust_2018_compatibility)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: use of deprecated macro `try`: use the `?` operator instead
[INFO] [stdout]   --> src/ggp.rs:46:21
[INFO] [stdout]    |
[INFO] [stdout] 46 |                     try!(write!(fmt, "({}", name));
[INFO] [stdout]    |                     ^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(deprecated)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: use of deprecated macro `try`: use the `?` operator instead
[INFO] [stdout]   --> src/ggp.rs:48:25
[INFO] [stdout]    |
[INFO] [stdout] 48 |                         try!(write!(fmt, " {}", arg));
[INFO] [stdout]    |                         ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: use of deprecated macro `try`: use the `?` operator instead
[INFO] [stdout]   --> src/ggp.rs:76:13
[INFO] [stdout]    |
[INFO] [stdout] 76 |             try!(write!(fmt, "("));
[INFO] [stdout]    |             ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: use of deprecated macro `try`: use the `?` operator instead
[INFO] [stdout]   --> src/ggp.rs:77:13
[INFO] [stdout]    |
[INFO] [stdout] 77 |             try!(write_interned(fmt, self.name));
[INFO] [stdout]    |             ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: use of deprecated macro `try`: use the `?` operator instead
[INFO] [stdout]   --> src/ggp.rs:79:17
[INFO] [stdout]    |
[INFO] [stdout] 79 |                 try!(write!(fmt, " {}", arg));
[INFO] [stdout]    |                 ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: use of deprecated macro `try`: use the `?` operator instead
[INFO] [stdout]    --> src/ggp.rs:254:31
[INFO] [stdout]     |
[INFO] [stdout] 254 |             let (arg, next) = try!(parse_sexpr(rest));
[INFO] [stdout]     |                               ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: use of deprecated macro `try`: use the `?` operator instead
[INFO] [stdout]    --> src/ggp.rs:362:13
[INFO] [stdout]     |
[INFO] [stdout] 362 |             try!(write!(fmt, "(<= {}", self.head));
[INFO] [stdout]     |             ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: use of deprecated macro `try`: use the `?` operator instead
[INFO] [stdout]    --> src/ggp.rs:364:17
[INFO] [stdout]     |
[INFO] [stdout] 364 |                 try!(write!(fmt, " {}", p));
[INFO] [stdout]     |                 ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: use of deprecated macro `try`: use the `?` operator instead
[INFO] [stdout]   --> src/ninemensmorris.rs:23:24
[INFO] [stdout]    |
[INFO] [stdout] 23 |         let f: isize = try!(ss.next().and_then(|s| s.parse().ok()).ok_or(()));
[INFO] [stdout]    |                        ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: use of deprecated macro `try`: use the `?` operator instead
[INFO] [stdout]   --> src/ninemensmorris.rs:24:24
[INFO] [stdout]    |
[INFO] [stdout] 24 |         let t: usize = try!(ss.next().and_then(|s| s.parse().ok()).ok_or(()));
[INFO] [stdout]    |                        ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: use of deprecated macro `try`: use the `?` operator instead
[INFO] [stdout]   --> src/ninemensmorris.rs:25:24
[INFO] [stdout]    |
[INFO] [stdout] 25 |         let r: isize = try!(ss.next().and_then(|s| s.parse().ok()).ok_or(()));
[INFO] [stdout]    |                        ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: use of deprecated macro `try`: use the `?` operator instead
[INFO] [stdout]   --> src/ninemensmorris.rs:36:9
[INFO] [stdout]    |
[INFO] [stdout] 36 |         try!(self.from.map(|x| x as isize).unwrap_or(-1).fmt(formatter));
[INFO] [stdout]    |         ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: use of deprecated macro `try`: use the `?` operator instead
[INFO] [stdout]   --> src/ninemensmorris.rs:37:9
[INFO] [stdout]    |
[INFO] [stdout] 37 |         try!(','.fmt(formatter));
[INFO] [stdout]    |         ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: use of deprecated macro `try`: use the `?` operator instead
[INFO] [stdout]   --> src/ninemensmorris.rs:38:9
[INFO] [stdout]    |
[INFO] [stdout] 38 |         try!(self.to.fmt(formatter));
[INFO] [stdout]    |         ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: use of deprecated macro `try`: use the `?` operator instead
[INFO] [stdout]   --> src/ninemensmorris.rs:39:9
[INFO] [stdout]    |
[INFO] [stdout] 39 |         try!(','.fmt(formatter));
[INFO] [stdout]    |         ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: use of deprecated function `std::mem::uninitialized`: use `mem::MaybeUninit` instead
[INFO] [stdout]  --> src/connectfour.rs:4:15
[INFO] [stdout]   |
[INFO] [stdout] 4 | use std::mem::uninitialized;
[INFO] [stdout]   |               ^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: use of deprecated function `std::mem::uninitialized`: use `mem::MaybeUninit` instead
[INFO] [stdout]   --> src/connectfour.rs:16:75
[INFO] [stdout]    |
[INFO] [stdout] 16 |         let mut b = unsafe /* hold on to your hat, 'cause here we go */ { uninitialized::<[Space; WIDTH * HEIGHT]>() };
[INFO] [stdout]    |                                                                           ^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]    --> src/ggp.rs:371:95
[INFO] [stdout]     |
[INFO] [stdout] 371 | fn add_arg<'a, 'b, I: Iterator<Item=Vec<Thing<'b>>> + 'a>(sofar: I, arg: &'a Expr<'b>) -> Box<Iterator<Item=Vec<Thing<'b>>> + 'a> {
[INFO] [stdout]     |                                                                                               ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = warning: this is accepted in the current edition (Rust 2015) but is a hard error in Rust 2021!
[INFO] [stdout]     = note: for more information, see <https://doc.rust-lang.org/edition-guide/rust-2021/warnings-promoted-to-error.html>
[INFO] [stdout]     = note: `#[warn(bare_trait_objects)]` (part of `#[warn(rust_2021_compatibility)]`) on by default
[INFO] [stdout] help: if this is a dyn-compatible trait, use `dyn`
[INFO] [stdout]     |
[INFO] [stdout] 371 | fn add_arg<'a, 'b, I: Iterator<Item=Vec<Thing<'b>>> + 'a>(sofar: I, arg: &'a Expr<'b>) -> Box<dyn Iterator<Item=Vec<Thing<'b>>> + 'a> {
[INFO] [stdout]     |                                                                                               +++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]    --> src/ggp.rs:384:89
[INFO] [stdout]     |
[INFO] [stdout] 384 | fn add_args<'a, 'b, I: Iterator<Item=&'a Expr<'b>>>(head: &'a Expr<'b>, from: I) -> Box<Iterator<Item=Fact<'b>> + 'a> {
[INFO] [stdout]     |                                                                                         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = warning: this is accepted in the current edition (Rust 2015) but is a hard error in Rust 2021!
[INFO] [stdout]     = note: for more information, see <https://doc.rust-lang.org/edition-guide/rust-2021/warnings-promoted-to-error.html>
[INFO] [stdout] help: if this is a dyn-compatible trait, use `dyn`
[INFO] [stdout]     |
[INFO] [stdout] 384 | fn add_args<'a, 'b, I: Iterator<Item=&'a Expr<'b>>>(head: &'a Expr<'b>, from: I) -> Box<dyn Iterator<Item=Fact<'b>> + 'a> {
[INFO] [stdout]     |                                                                                         +++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]    --> src/ggp.rs:510:56
[INFO] [stdout]     |
[INFO] [stdout] 510 |     pub fn query<'b>(&'b self, expr: &'b IExpr) -> Box<Iterator<Item=IExpr> + 'b> {
[INFO] [stdout]     |                                                        ^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = warning: this is accepted in the current edition (Rust 2015) but is a hard error in Rust 2021!
[INFO] [stdout]     = note: for more information, see <https://doc.rust-lang.org/edition-guide/rust-2021/warnings-promoted-to-error.html>
[INFO] [stdout] help: if this is a dyn-compatible trait, use `dyn`
[INFO] [stdout]     |
[INFO] [stdout] 510 |     pub fn query<'b>(&'b self, expr: &'b IExpr) -> Box<dyn Iterator<Item=IExpr> + 'b> {
[INFO] [stdout]     |                                                        +++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]    --> src/ggp.rs:521:74
[INFO] [stdout]     |
[INFO] [stdout] 521 |     fn query_inner<'b>(&'b self, expr: ValExpr, asg: Assignments) -> Box<Iterator<Item=Assignments> + 'b> {
[INFO] [stdout]     |                                                                          ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = warning: this is accepted in the current edition (Rust 2015) but is a hard error in Rust 2021!
[INFO] [stdout]     = note: for more information, see <https://doc.rust-lang.org/edition-guide/rust-2021/warnings-promoted-to-error.html>
[INFO] [stdout] help: if this is a dyn-compatible trait, use `dyn`
[INFO] [stdout]     |
[INFO] [stdout] 521 |     fn query_inner<'b>(&'b self, expr: ValExpr, asg: Assignments) -> Box<dyn Iterator<Item=Assignments> + 'b> {
[INFO] [stdout]     |                                                                          +++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: use of deprecated method `core::str::<impl str>::trim_left`: superseded by `trim_start`
[INFO] [stdout]    --> src/ggp.rs:214:19
[INFO] [stdout]     |
[INFO] [stdout] 214 |     let mut s = s.trim_left();
[INFO] [stdout]     |                   ^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout] help: replace the use of the deprecated method
[INFO] [stdout]     |
[INFO] [stdout] 214 -     let mut s = s.trim_left();
[INFO] [stdout] 214 +     let mut s = s.trim_start();
[INFO] [stdout]     |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: use of deprecated method `core::str::<impl str>::trim_left`: superseded by `trim_start`
[INFO] [stdout]    --> src/ggp.rs:216:51
[INFO] [stdout]     |
[INFO] [stdout] 216 |         s = &s[s.find('\n').unwrap_or(s.len())..].trim_left();
[INFO] [stdout]     |                                                   ^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout] help: replace the use of the deprecated method
[INFO] [stdout]     |
[INFO] [stdout] 216 -         s = &s[s.find('\n').unwrap_or(s.len())..].trim_left();
[INFO] [stdout] 216 +         s = &s[s.find('\n').unwrap_or(s.len())..].trim_start();
[INFO] [stdout]     |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]    --> src/ggp.rs:375:71
[INFO] [stdout]     |
[INFO] [stdout] 375 |             "and" => Box::new(args.iter().fold(Box::new(sofar) as Box<Iterator<Item=_>>, add_arg)),
[INFO] [stdout]     |                                                                       ^^^^^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = warning: this is accepted in the current edition (Rust 2015) but is a hard error in Rust 2021!
[INFO] [stdout]     = note: for more information, see <https://doc.rust-lang.org/edition-guide/rust-2021/warnings-promoted-to-error.html>
[INFO] [stdout] help: if this is a dyn-compatible trait, use `dyn`
[INFO] [stdout]     |
[INFO] [stdout] 375 |             "and" => Box::new(args.iter().fold(Box::new(sofar) as Box<dyn Iterator<Item=_>>, add_arg)),
[INFO] [stdout]     |                                                                       +++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]    --> src/ggp.rs:385:46
[INFO] [stdout]     |
[INFO] [stdout] 385 |     let base = Box::new(once(vec![])) as Box<Iterator<Item=_>>;
[INFO] [stdout]     |                                              ^^^^^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = warning: this is accepted in the current edition (Rust 2015) but is a hard error in Rust 2021!
[INFO] [stdout]     = note: for more information, see <https://doc.rust-lang.org/edition-guide/rust-2021/warnings-promoted-to-error.html>
[INFO] [stdout] help: if this is a dyn-compatible trait, use `dyn`
[INFO] [stdout]     |
[INFO] [stdout] 385 |     let base = Box::new(once(vec![])) as Box<dyn Iterator<Item=_>>;
[INFO] [stdout]     |                                              +++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]    --> src/ggp.rs:529:118
[INFO] [stdout]     |
[INFO] [stdout] 529 | ...g| (asg, vars)).into_iter()) as Box<Iterator<Item=(Assignments, HashMap<usize, usize>)> + 'b>, move |asgs, t| {
[INFO] [stdout]     |                                        ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = warning: this is accepted in the current edition (Rust 2015) but is a hard error in Rust 2021!
[INFO] [stdout]     = note: for more information, see <https://doc.rust-lang.org/edition-guide/rust-2021/warnings-promoted-to-error.html>
[INFO] [stdout] help: if this is a dyn-compatible trait, use `dyn`
[INFO] [stdout]     |
[INFO] [stdout] 529 |                     body.iter().fold(Box::new(asg.unify_val(&expr, &head).map(|asg| (asg, vars)).into_iter()) as Box<dyn Iterator<Item=(Assignments, HashMap<usize, usize>)> + 'b>, move |asgs, t| {
[INFO] [stdout]     |                                                                                                                      +++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: the type `[basics::Space; 42]` does not permit being left uninitialized
[INFO] [stdout]   --> src/connectfour.rs:16:75
[INFO] [stdout]    |
[INFO] [stdout] 16 |         let mut b = unsafe /* hold on to your hat, 'cause here we go */ { uninitialized::<[Space; WIDTH * HEIGHT]>() };
[INFO] [stdout]    |                                                                           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]    |                                                                           |
[INFO] [stdout]    |                                                                           this code causes undefined behavior when executed
[INFO] [stdout]    |                                                                           help: use `MaybeUninit<T>` instead, and only call `assume_init` after initialization is done
[INFO] [stdout]    |
[INFO] [stdout] note: enums with multiple inhabited variants have to be initialized to a variant
[INFO] [stdout]   --> src/basics.rs:86:1
[INFO] [stdout]    |
[INFO] [stdout] 86 | pub enum Space { Empty, Black, White }
[INFO] [stdout]    | ^^^^^^^^^^^^^^
[INFO] [stdout]    = note: `#[warn(invalid_value)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: hiding a lifetime that's elided elsewhere is confusing
[INFO] [stdout]    --> src/ggp.rs:221:18
[INFO] [stdout]     |
[INFO] [stdout] 221 | fn parse_word(s: &str) -> Parsed<&str> {
[INFO] [stdout]     |                  ^^^^     ^^^^^^^^^^^^
[INFO] [stdout]     |                  |        |      |
[INFO] [stdout]     |                  |        |      the same lifetime is elided here
[INFO] [stdout]     |                  |        the same lifetime is hidden here
[INFO] [stdout]     |                  the lifetime is elided 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: use `'_` for type paths
[INFO] [stdout]     |
[INFO] [stdout] 221 | fn parse_word(s: &str) -> Parsed<'_, &str> {
[INFO] [stdout]     |                                  +++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: hiding a lifetime that's elided elsewhere is confusing
[INFO] [stdout]    --> src/ggp.rs:248:23
[INFO] [stdout]     |
[INFO] [stdout] 248 | pub fn parse_sexpr(s: &str) -> Parsed<SExpr> {
[INFO] [stdout]     |                       ^^^^     ^^^^^^^^^^^^^
[INFO] [stdout]     |                       |        |      |
[INFO] [stdout]     |                       |        |      the same lifetime is hidden here
[INFO] [stdout]     |                       |        the same lifetime is hidden here
[INFO] [stdout]     |                       the lifetime is elided here
[INFO] [stdout]     |
[INFO] [stdout]     = help: the same lifetime is referred to in inconsistent ways, making the signature confusing
[INFO] [stdout] help: use `'_` for type paths
[INFO] [stdout]     |
[INFO] [stdout] 248 | pub fn parse_sexpr(s: &str) -> Parsed<'_, SExpr<'_>> {
[INFO] [stdout]     |                                       +++      ++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: this method call resolves to `<&[T; N] as IntoIterator>::into_iter` (due to backwards compatibility), but will resolve to `<[T; N] as IntoIterator>::into_iter` in Rust 2021
[INFO] [stdout]   --> src/go.rs:28:32
[INFO] [stdout]    |
[INFO] [stdout] 28 |         for &p in neighbors(p).into_iter().flat_map(|x| x) {
[INFO] [stdout]    |                                ^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = warning: this changes meaning in Rust 2021
[INFO] [stdout]    = note: for more information, see <https://doc.rust-lang.org/edition-guide/rust-2021/IntoIterator-for-arrays.html>
[INFO] [stdout]    = note: `#[warn(array_into_iter)]` (part of `#[warn(rust_2021_compatibility)]`) on by default
[INFO] [stdout] help: use `.iter()` instead of `.into_iter()` to avoid ambiguity
[INFO] [stdout]    |
[INFO] [stdout] 28 -         for &p in neighbors(p).into_iter().flat_map(|x| x) {
[INFO] [stdout] 28 +         for &p in neighbors(p).iter().flat_map(|x| x) {
[INFO] [stdout]    |
[INFO] [stdout] help: or use `IntoIterator::into_iter(..)` instead of `.into_iter()` to explicitly iterate by value
[INFO] [stdout]    |
[INFO] [stdout] 28 -         for &p in neighbors(p).into_iter().flat_map(|x| x) {
[INFO] [stdout] 28 +         for &p in IntoIterator::into_iter(neighbors(p)).flat_map(|x| x) {
[INFO] [stdout]    |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: this method call resolves to `<&[T; N] as IntoIterator>::into_iter` (due to backwards compatibility), but will resolve to `<[T; N] as IntoIterator>::into_iter` in Rust 2021
[INFO] [stdout]   --> src/go.rs:60:33
[INFO] [stdout]    |
[INFO] [stdout] 60 |                 if neighbors(p).into_iter().flat_map(|x| x).any(|&p| !capture_inner(c, p, b, captured)) { return false }
[INFO] [stdout]    |                                 ^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = warning: this changes meaning in Rust 2021
[INFO] [stdout]    = note: for more information, see <https://doc.rust-lang.org/edition-guide/rust-2021/IntoIterator-for-arrays.html>
[INFO] [stdout] help: use `.iter()` instead of `.into_iter()` to avoid ambiguity
[INFO] [stdout]    |
[INFO] [stdout] 60 -                 if neighbors(p).into_iter().flat_map(|x| x).any(|&p| !capture_inner(c, p, b, captured)) { return false }
[INFO] [stdout] 60 +                 if neighbors(p).iter().flat_map(|x| x).any(|&p| !capture_inner(c, p, b, captured)) { return false }
[INFO] [stdout]    |
[INFO] [stdout] help: or use `IntoIterator::into_iter(..)` instead of `.into_iter()` to explicitly iterate by value
[INFO] [stdout]    |
[INFO] [stdout] 60 -                 if neighbors(p).into_iter().flat_map(|x| x).any(|&p| !capture_inner(c, p, b, captured)) { return false }
[INFO] [stdout] 60 +                 if IntoIterator::into_iter(neighbors(p)).flat_map(|x| x).any(|&p| !capture_inner(c, p, b, captured)) { return false }
[INFO] [stdout]    |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: this method call resolves to `<&[T; N] as IntoIterator>::into_iter` (due to backwards compatibility), but will resolve to `<[T; N] as IntoIterator>::into_iter` in Rust 2021
[INFO] [stdout]    --> src/go.rs:123:32
[INFO] [stdout]     |
[INFO] [stdout] 123 |         for &p in neighbors(p).into_iter().flat_map(|x| x) {
[INFO] [stdout]     |                                ^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = warning: this changes meaning in Rust 2021
[INFO] [stdout]     = note: for more information, see <https://doc.rust-lang.org/edition-guide/rust-2021/IntoIterator-for-arrays.html>
[INFO] [stdout] help: use `.iter()` instead of `.into_iter()` to avoid ambiguity
[INFO] [stdout]     |
[INFO] [stdout] 123 -         for &p in neighbors(p).into_iter().flat_map(|x| x) {
[INFO] [stdout] 123 +         for &p in neighbors(p).iter().flat_map(|x| x) {
[INFO] [stdout]     |
[INFO] [stdout] help: or use `IntoIterator::into_iter(..)` instead of `.into_iter()` to explicitly iterate by value
[INFO] [stdout]     |
[INFO] [stdout] 123 -         for &p in neighbors(p).into_iter().flat_map(|x| x) {
[INFO] [stdout] 123 +         for &p in IntoIterator::into_iter(neighbors(p)).flat_map(|x| x) {
[INFO] [stdout]     |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: this method call resolves to `<&[T; N] as IntoIterator>::into_iter` (due to backwards compatibility), but will resolve to `<[T; N] as IntoIterator>::into_iter` in Rust 2021
[INFO] [stdout]    --> src/go.rs:136:32
[INFO] [stdout]     |
[INFO] [stdout] 136 |         for &p in neighbors(p).into_iter().flat_map(|x| x) {
[INFO] [stdout]     |                                ^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = warning: this changes meaning in Rust 2021
[INFO] [stdout]     = note: for more information, see <https://doc.rust-lang.org/edition-guide/rust-2021/IntoIterator-for-arrays.html>
[INFO] [stdout] help: use `.iter()` instead of `.into_iter()` to avoid ambiguity
[INFO] [stdout]     |
[INFO] [stdout] 136 -         for &p in neighbors(p).into_iter().flat_map(|x| x) {
[INFO] [stdout] 136 +         for &p in neighbors(p).iter().flat_map(|x| x) {
[INFO] [stdout]     |
[INFO] [stdout] help: or use `IntoIterator::into_iter(..)` instead of `.into_iter()` to explicitly iterate by value
[INFO] [stdout]     |
[INFO] [stdout] 136 -         for &p in neighbors(p).into_iter().flat_map(|x| x) {
[INFO] [stdout] 136 +         for &p in IntoIterator::into_iter(neighbors(p)).flat_map(|x| x) {
[INFO] [stdout]     |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: this method call resolves to `<&[T; N] as IntoIterator>::into_iter` (due to backwards compatibility), but will resolve to `<[T; N] as IntoIterator>::into_iter` in Rust 2021
[INFO] [stdout]    --> src/go.rs:151:25
[INFO] [stdout]     |
[INFO] [stdout] 151 |         if neighbors(p).into_iter().flat_map(|x| x).any(|&p| {
[INFO] [stdout]     |                         ^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = warning: this changes meaning in Rust 2021
[INFO] [stdout]     = note: for more information, see <https://doc.rust-lang.org/edition-guide/rust-2021/IntoIterator-for-arrays.html>
[INFO] [stdout] help: use `.iter()` instead of `.into_iter()` to avoid ambiguity
[INFO] [stdout]     |
[INFO] [stdout] 151 -         if neighbors(p).into_iter().flat_map(|x| x).any(|&p| {
[INFO] [stdout] 151 +         if neighbors(p).iter().flat_map(|x| x).any(|&p| {
[INFO] [stdout]     |
[INFO] [stdout] help: or use `IntoIterator::into_iter(..)` instead of `.into_iter()` to explicitly iterate by value
[INFO] [stdout]     |
[INFO] [stdout] 151 -         if neighbors(p).into_iter().flat_map(|x| x).any(|&p| {
[INFO] [stdout] 151 +         if IntoIterator::into_iter(neighbors(p)).flat_map(|x| x).any(|&p| {
[INFO] [stdout]     |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: this method call resolves to `<&[T; N] as IntoIterator>::into_iter` (due to backwards compatibility), but will resolve to `<[T; N] as IntoIterator>::into_iter` in Rust 2021
[INFO] [stdout]    --> src/go.rs:155:35
[INFO] [stdout]     |
[INFO] [stdout] 155 |                 c => neighbors(p).into_iter().filter_map(|&x| x).filter(|&p| self.board[p] != c.enemy()).count() == 1
[INFO] [stdout]     |                                   ^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = warning: this changes meaning in Rust 2021
[INFO] [stdout]     = note: for more information, see <https://doc.rust-lang.org/edition-guide/rust-2021/IntoIterator-for-arrays.html>
[INFO] [stdout] help: use `.iter()` instead of `.into_iter()` to avoid ambiguity
[INFO] [stdout]     |
[INFO] [stdout] 155 -                 c => neighbors(p).into_iter().filter_map(|&x| x).filter(|&p| self.board[p] != c.enemy()).count() == 1
[INFO] [stdout] 155 +                 c => neighbors(p).iter().filter_map(|&x| x).filter(|&p| self.board[p] != c.enemy()).count() == 1
[INFO] [stdout]     |
[INFO] [stdout] help: or use `IntoIterator::into_iter(..)` instead of `.into_iter()` to explicitly iterate by value
[INFO] [stdout]     |
[INFO] [stdout] 155 -                 c => neighbors(p).into_iter().filter_map(|&x| x).filter(|&p| self.board[p] != c.enemy()).count() == 1
[INFO] [stdout] 155 +                 c => IntoIterator::into_iter(neighbors(p)).filter_map(|&x| x).filter(|&p| self.board[p] != c.enemy()).count() == 1
[INFO] [stdout]     |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: hiding a lifetime that's elided elsewhere is confusing
[INFO] [stdout]    --> src/bin/two-player.rs:205:40
[INFO] [stdout]     |
[INFO] [stdout] 205 | fn parse_client_server_command(string: &str) -> Option<ClientServerCmd> {
[INFO] [stdout]     |                                        ^^^^            ^^^^^^^^^^^^^^^ the same lifetime is hidden here
[INFO] [stdout]     |                                        |
[INFO] [stdout]     |                                        the lifetime is elided 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: use `'_` for type paths
[INFO] [stdout]     |
[INFO] [stdout] 205 | fn parse_client_server_command(string: &str) -> Option<ClientServerCmd<'_>> {
[INFO] [stdout]     |                                                                       ++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: fields `0` and `1` are never read
[INFO] [stdout]    --> src/bin/worthy-opponent.rs:121:13
[INFO] [stdout]     |
[INFO] [stdout] 121 |     Preview(SExpr<'a>, u64),
[INFO] [stdout]     |     ------- ^^^^^^^^^  ^^^
[INFO] [stdout]     |     |
[INFO] [stdout]     |     fields in this variant
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(dead_code)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] help: consider changing the fields to be of unit type to suppress this warning while preserving the field numbering, or remove the fields
[INFO] [stdout]     |
[INFO] [stdout] 121 -     Preview(SExpr<'a>, u64),
[INFO] [stdout] 121 +     Preview((), ()),
[INFO] [stdout]     |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field `1` is never read
[INFO] [stdout]    --> src/bin/worthy-opponent.rs:124:19
[INFO] [stdout]     |
[INFO] [stdout] 124 |     Stop(&'a str, Vec<Expr<'a>>),
[INFO] [stdout]     |     ----          ^^^^^^^^^^^^^
[INFO] [stdout]     |     |
[INFO] [stdout]     |     field in this variant
[INFO] [stdout]     |
[INFO] [stdout] help: consider changing the field to be of unit type to suppress this warning while preserving the field numbering, or remove the field
[INFO] [stdout]     |
[INFO] [stdout] 124 -     Stop(&'a str, Vec<Expr<'a>>),
[INFO] [stdout] 124 +     Stop(&'a str, ()),
[INFO] [stdout]     |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: hiding a lifetime that's elided elsewhere is confusing
[INFO] [stdout]    --> src/bin/worthy-opponent.rs:128:21
[INFO] [stdout]     |
[INFO] [stdout] 128 | fn parse_message(s: &str) -> Option<Message> {
[INFO] [stdout]     |                     ^^^^            ^^^^^^^ the same lifetime is hidden here
[INFO] [stdout]     |                     |
[INFO] [stdout]     |                     the lifetime is elided 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: use `'_` for type paths
[INFO] [stdout]     |
[INFO] [stdout] 128 | fn parse_message(s: &str) -> Option<Message<'_>> {
[INFO] [stdout]     |                                            ++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Checking serde_json v1.0.34
[INFO] [stderr]     Checking csv v1.0.5
[INFO] [stderr]     Checking env_logger v0.5.13
[INFO] [stderr]     Checking quickcheck v0.7.2
[INFO] [stderr]     Checking handlebars v1.0.5
[INFO] [stderr]    Compiling synstructure v0.10.1
[INFO] [stderr]    Compiling serde_derive v1.0.84
[INFO] [stderr]    Compiling failure_derive v0.1.5
[INFO] [stderr]     Checking failure v0.1.5
[INFO] [stderr]     Checking criterion-plot v0.2.7
[INFO] [stderr]     Checking criterion v0.2.7
[INFO] [stdout] warning: anonymous parameters are deprecated and will be removed in the next edition
[INFO] [stdout]   --> src/game.rs:10:24
[INFO] [stdout]    |
[INFO] [stdout] 10 |     fn play(&mut self, &Self::Move);
[INFO] [stdout]    |                        ^^^^^^^^^^^ help: try naming the parameter or explicitly ignoring it: `_: &Self::Move`
[INFO] [stdout]    |
[INFO] [stdout]    = warning: this is accepted in the current edition (Rust 2015) but is a hard error in Rust 2018!
[INFO] [stdout]    = note: for more information, see <https://doc.rust-lang.org/edition-guide/rust-2018/trait-fn-parameters.html>
[INFO] [stdout]    = note: `#[warn(anonymous_parameters)]` (part of `#[warn(rust_2018_compatibility)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: use of deprecated macro `try`: use the `?` operator instead
[INFO] [stdout]   --> src/ggp.rs:46:21
[INFO] [stdout]    |
[INFO] [stdout] 46 |                     try!(write!(fmt, "({}", name));
[INFO] [stdout]    |                     ^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(deprecated)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: use of deprecated macro `try`: use the `?` operator instead
[INFO] [stdout]   --> src/ggp.rs:48:25
[INFO] [stdout]    |
[INFO] [stdout] 48 |                         try!(write!(fmt, " {}", arg));
[INFO] [stdout]    |                         ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: use of deprecated macro `try`: use the `?` operator instead
[INFO] [stdout]   --> src/ggp.rs:76:13
[INFO] [stdout]    |
[INFO] [stdout] 76 |             try!(write!(fmt, "("));
[INFO] [stdout]    |             ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: use of deprecated macro `try`: use the `?` operator instead
[INFO] [stdout]   --> src/ggp.rs:77:13
[INFO] [stdout]    |
[INFO] [stdout] 77 |             try!(write_interned(fmt, self.name));
[INFO] [stdout]    |             ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: use of deprecated macro `try`: use the `?` operator instead
[INFO] [stdout]   --> src/ggp.rs:79:17
[INFO] [stdout]    |
[INFO] [stdout] 79 |                 try!(write!(fmt, " {}", arg));
[INFO] [stdout]    |                 ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: use of deprecated macro `try`: use the `?` operator instead
[INFO] [stdout]    --> src/ggp.rs:254:31
[INFO] [stdout]     |
[INFO] [stdout] 254 |             let (arg, next) = try!(parse_sexpr(rest));
[INFO] [stdout]     |                               ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: use of deprecated macro `try`: use the `?` operator instead
[INFO] [stdout]    --> src/ggp.rs:362:13
[INFO] [stdout]     |
[INFO] [stdout] 362 |             try!(write!(fmt, "(<= {}", self.head));
[INFO] [stdout]     |             ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: use of deprecated macro `try`: use the `?` operator instead
[INFO] [stdout]    --> src/ggp.rs:364:17
[INFO] [stdout]     |
[INFO] [stdout] 364 |                 try!(write!(fmt, " {}", p));
[INFO] [stdout]     |                 ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: use of deprecated macro `try`: use the `?` operator instead
[INFO] [stdout]   --> src/ninemensmorris.rs:23:24
[INFO] [stdout]    |
[INFO] [stdout] 23 |         let f: isize = try!(ss.next().and_then(|s| s.parse().ok()).ok_or(()));
[INFO] [stdout]    |                        ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: use of deprecated macro `try`: use the `?` operator instead
[INFO] [stdout]   --> src/ninemensmorris.rs:24:24
[INFO] [stdout]    |
[INFO] [stdout] 24 |         let t: usize = try!(ss.next().and_then(|s| s.parse().ok()).ok_or(()));
[INFO] [stdout]    |                        ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: use of deprecated macro `try`: use the `?` operator instead
[INFO] [stdout]   --> src/ninemensmorris.rs:25:24
[INFO] [stdout]    |
[INFO] [stdout] 25 |         let r: isize = try!(ss.next().and_then(|s| s.parse().ok()).ok_or(()));
[INFO] [stdout]    |                        ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: use of deprecated macro `try`: use the `?` operator instead
[INFO] [stdout]   --> src/ninemensmorris.rs:36:9
[INFO] [stdout]    |
[INFO] [stdout] 36 |         try!(self.from.map(|x| x as isize).unwrap_or(-1).fmt(formatter));
[INFO] [stdout]    |         ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: use of deprecated macro `try`: use the `?` operator instead
[INFO] [stdout]   --> src/ninemensmorris.rs:37:9
[INFO] [stdout]    |
[INFO] [stdout] 37 |         try!(','.fmt(formatter));
[INFO] [stdout]    |         ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: use of deprecated macro `try`: use the `?` operator instead
[INFO] [stdout]   --> src/ninemensmorris.rs:38:9
[INFO] [stdout]    |
[INFO] [stdout] 38 |         try!(self.to.fmt(formatter));
[INFO] [stdout]    |         ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: use of deprecated macro `try`: use the `?` operator instead
[INFO] [stdout]   --> src/ninemensmorris.rs:39:9
[INFO] [stdout]    |
[INFO] [stdout] 39 |         try!(','.fmt(formatter));
[INFO] [stdout]    |         ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: use of deprecated function `std::mem::uninitialized`: use `mem::MaybeUninit` instead
[INFO] [stdout]  --> src/connectfour.rs:4:15
[INFO] [stdout]   |
[INFO] [stdout] 4 | use std::mem::uninitialized;
[INFO] [stdout]   |               ^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: use of deprecated function `std::mem::uninitialized`: use `mem::MaybeUninit` instead
[INFO] [stdout]   --> src/connectfour.rs:16:75
[INFO] [stdout]    |
[INFO] [stdout] 16 |         let mut b = unsafe /* hold on to your hat, 'cause here we go */ { uninitialized::<[Space; WIDTH * HEIGHT]>() };
[INFO] [stdout]    |                                                                           ^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]    --> src/basics.rs:120:36
[INFO] [stdout]     |
[INFO] [stdout] 120 |     fn shrink(self: &Space) -> Box<Iterator<Item=Space>> {
[INFO] [stdout]     |                                    ^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = warning: this is accepted in the current edition (Rust 2015) but is a hard error in Rust 2021!
[INFO] [stdout]     = note: for more information, see <https://doc.rust-lang.org/edition-guide/rust-2021/warnings-promoted-to-error.html>
[INFO] [stdout]     = note: `#[warn(bare_trait_objects)]` (part of `#[warn(rust_2021_compatibility)]`) on by default
[INFO] [stdout] help: if this is a dyn-compatible trait, use `dyn`
[INFO] [stdout]     |
[INFO] [stdout] 120 |     fn shrink(self: &Space) -> Box<dyn Iterator<Item=Space>> {
[INFO] [stdout]     |                                    +++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]    --> src/ggp.rs:371:95
[INFO] [stdout]     |
[INFO] [stdout] 371 | fn add_arg<'a, 'b, I: Iterator<Item=Vec<Thing<'b>>> + 'a>(sofar: I, arg: &'a Expr<'b>) -> Box<Iterator<Item=Vec<Thing<'b>>> + 'a> {
[INFO] [stdout]     |                                                                                               ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = warning: this is accepted in the current edition (Rust 2015) but is a hard error in Rust 2021!
[INFO] [stdout]     = note: for more information, see <https://doc.rust-lang.org/edition-guide/rust-2021/warnings-promoted-to-error.html>
[INFO] [stdout] help: if this is a dyn-compatible trait, use `dyn`
[INFO] [stdout]     |
[INFO] [stdout] 371 | fn add_arg<'a, 'b, I: Iterator<Item=Vec<Thing<'b>>> + 'a>(sofar: I, arg: &'a Expr<'b>) -> Box<dyn Iterator<Item=Vec<Thing<'b>>> + 'a> {
[INFO] [stdout]     |                                                                                               +++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]    --> src/ggp.rs:384:89
[INFO] [stdout]     |
[INFO] [stdout] 384 | fn add_args<'a, 'b, I: Iterator<Item=&'a Expr<'b>>>(head: &'a Expr<'b>, from: I) -> Box<Iterator<Item=Fact<'b>> + 'a> {
[INFO] [stdout]     |                                                                                         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = warning: this is accepted in the current edition (Rust 2015) but is a hard error in Rust 2021!
[INFO] [stdout]     = note: for more information, see <https://doc.rust-lang.org/edition-guide/rust-2021/warnings-promoted-to-error.html>
[INFO] [stdout] help: if this is a dyn-compatible trait, use `dyn`
[INFO] [stdout]     |
[INFO] [stdout] 384 | fn add_args<'a, 'b, I: Iterator<Item=&'a Expr<'b>>>(head: &'a Expr<'b>, from: I) -> Box<dyn Iterator<Item=Fact<'b>> + 'a> {
[INFO] [stdout]     |                                                                                         +++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]    --> src/ggp.rs:510:56
[INFO] [stdout]     |
[INFO] [stdout] 510 |     pub fn query<'b>(&'b self, expr: &'b IExpr) -> Box<Iterator<Item=IExpr> + 'b> {
[INFO] [stdout]     |                                                        ^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = warning: this is accepted in the current edition (Rust 2015) but is a hard error in Rust 2021!
[INFO] [stdout]     = note: for more information, see <https://doc.rust-lang.org/edition-guide/rust-2021/warnings-promoted-to-error.html>
[INFO] [stdout] help: if this is a dyn-compatible trait, use `dyn`
[INFO] [stdout]     |
[INFO] [stdout] 510 |     pub fn query<'b>(&'b self, expr: &'b IExpr) -> Box<dyn Iterator<Item=IExpr> + 'b> {
[INFO] [stdout]     |                                                        +++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]    --> src/ggp.rs:521:74
[INFO] [stdout]     |
[INFO] [stdout] 521 |     fn query_inner<'b>(&'b self, expr: ValExpr, asg: Assignments) -> Box<Iterator<Item=Assignments> + 'b> {
[INFO] [stdout]     |                                                                          ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = warning: this is accepted in the current edition (Rust 2015) but is a hard error in Rust 2021!
[INFO] [stdout]     = note: for more information, see <https://doc.rust-lang.org/edition-guide/rust-2021/warnings-promoted-to-error.html>
[INFO] [stdout] help: if this is a dyn-compatible trait, use `dyn`
[INFO] [stdout]     |
[INFO] [stdout] 521 |     fn query_inner<'b>(&'b self, expr: ValExpr, asg: Assignments) -> Box<dyn Iterator<Item=Assignments> + 'b> {
[INFO] [stdout]     |                                                                          +++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: use of deprecated method `core::str::<impl str>::trim_left`: superseded by `trim_start`
[INFO] [stdout]    --> src/ggp.rs:214:19
[INFO] [stdout]     |
[INFO] [stdout] 214 |     let mut s = s.trim_left();
[INFO] [stdout]     |                   ^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout] help: replace the use of the deprecated method
[INFO] [stdout]     |
[INFO] [stdout] 214 -     let mut s = s.trim_left();
[INFO] [stdout] 214 +     let mut s = s.trim_start();
[INFO] [stdout]     |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: use of deprecated method `core::str::<impl str>::trim_left`: superseded by `trim_start`
[INFO] [stdout]    --> src/ggp.rs:216:51
[INFO] [stdout]     |
[INFO] [stdout] 216 |         s = &s[s.find('\n').unwrap_or(s.len())..].trim_left();
[INFO] [stdout]     |                                                   ^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout] help: replace the use of the deprecated method
[INFO] [stdout]     |
[INFO] [stdout] 216 -         s = &s[s.find('\n').unwrap_or(s.len())..].trim_left();
[INFO] [stdout] 216 +         s = &s[s.find('\n').unwrap_or(s.len())..].trim_start();
[INFO] [stdout]     |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]    --> src/ggp.rs:375:71
[INFO] [stdout]     |
[INFO] [stdout] 375 |             "and" => Box::new(args.iter().fold(Box::new(sofar) as Box<Iterator<Item=_>>, add_arg)),
[INFO] [stdout]     |                                                                       ^^^^^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = warning: this is accepted in the current edition (Rust 2015) but is a hard error in Rust 2021!
[INFO] [stdout]     = note: for more information, see <https://doc.rust-lang.org/edition-guide/rust-2021/warnings-promoted-to-error.html>
[INFO] [stdout] help: if this is a dyn-compatible trait, use `dyn`
[INFO] [stdout]     |
[INFO] [stdout] 375 |             "and" => Box::new(args.iter().fold(Box::new(sofar) as Box<dyn Iterator<Item=_>>, add_arg)),
[INFO] [stdout]     |                                                                       +++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]    --> src/ggp.rs:385:46
[INFO] [stdout]     |
[INFO] [stdout] 385 |     let base = Box::new(once(vec![])) as Box<Iterator<Item=_>>;
[INFO] [stdout]     |                                              ^^^^^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = warning: this is accepted in the current edition (Rust 2015) but is a hard error in Rust 2021!
[INFO] [stdout]     = note: for more information, see <https://doc.rust-lang.org/edition-guide/rust-2021/warnings-promoted-to-error.html>
[INFO] [stdout] help: if this is a dyn-compatible trait, use `dyn`
[INFO] [stdout]     |
[INFO] [stdout] 385 |     let base = Box::new(once(vec![])) as Box<dyn Iterator<Item=_>>;
[INFO] [stdout]     |                                              +++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stdout]    --> src/ggp.rs:529:118
[INFO] [stdout]     |
[INFO] [stdout] 529 | ...g| (asg, vars)).into_iter()) as Box<Iterator<Item=(Assignments, HashMap<usize, usize>)> + 'b>, move |asgs, t| {
[INFO] [stdout]     |                                        ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = warning: this is accepted in the current edition (Rust 2015) but is a hard error in Rust 2021!
[INFO] [stdout]     = note: for more information, see <https://doc.rust-lang.org/edition-guide/rust-2021/warnings-promoted-to-error.html>
[INFO] [stdout] help: if this is a dyn-compatible trait, use `dyn`
[INFO] [stdout]     |
[INFO] [stdout] 529 |                     body.iter().fold(Box::new(asg.unify_val(&expr, &head).map(|asg| (asg, vars)).into_iter()) as Box<dyn Iterator<Item=(Assignments, HashMap<usize, usize>)> + 'b>, move |asgs, t| {
[INFO] [stdout]     |                                                                                                                      +++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: fields `0` and `1` are never read
[INFO] [stdout]    --> src/bin/worthy-opponent.rs:121:13
[INFO] [stdout]     |
[INFO] [stdout] 121 |     Preview(SExpr<'a>, u64),
[INFO] [stdout]     |     ------- ^^^^^^^^^  ^^^
[INFO] [stdout]     |     |
[INFO] [stdout]     |     fields in this variant
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(dead_code)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] help: consider changing the fields to be of unit type to suppress this warning while preserving the field numbering, or remove the fields
[INFO] [stdout]     |
[INFO] [stdout] 121 -     Preview(SExpr<'a>, u64),
[INFO] [stdout] 121 +     Preview((), ()),
[INFO] [stdout]     |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field `1` is never read
[INFO] [stdout]    --> src/bin/worthy-opponent.rs:124:19
[INFO] [stdout]     |
[INFO] [stdout] 124 |     Stop(&'a str, Vec<Expr<'a>>),
[INFO] [stdout]     |     ----          ^^^^^^^^^^^^^
[INFO] [stdout]     |     |
[INFO] [stdout]     |     field in this variant
[INFO] [stdout]     |
[INFO] [stdout] help: consider changing the field to be of unit type to suppress this warning while preserving the field numbering, or remove the field
[INFO] [stdout]     |
[INFO] [stdout] 124 -     Stop(&'a str, Vec<Expr<'a>>),
[INFO] [stdout] 124 +     Stop(&'a str, ()),
[INFO] [stdout]     |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: hiding a lifetime that's elided elsewhere is confusing
[INFO] [stdout]    --> src/bin/worthy-opponent.rs:128:21
[INFO] [stdout]     |
[INFO] [stdout] 128 | fn parse_message(s: &str) -> Option<Message> {
[INFO] [stdout]     |                     ^^^^            ^^^^^^^ the same lifetime is hidden here
[INFO] [stdout]     |                     |
[INFO] [stdout]     |                     the lifetime is elided 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: use `'_` for type paths
[INFO] [stdout]     |
[INFO] [stdout] 128 | fn parse_message(s: &str) -> Option<Message<'_>> {
[INFO] [stdout]     |                                            ++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: hiding a lifetime that's elided elsewhere is confusing
[INFO] [stdout]    --> src/bin/two-player.rs:205:40
[INFO] [stdout]     |
[INFO] [stdout] 205 | fn parse_client_server_command(string: &str) -> Option<ClientServerCmd> {
[INFO] [stdout]     |                                        ^^^^            ^^^^^^^^^^^^^^^ the same lifetime is hidden here
[INFO] [stdout]     |                                        |
[INFO] [stdout]     |                                        the lifetime is elided 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: use `'_` for type paths
[INFO] [stdout]     |
[INFO] [stdout] 205 | fn parse_client_server_command(string: &str) -> Option<ClientServerCmd<'_>> {
[INFO] [stdout]     |                                                                       ++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: the type `[basics::Space; 42]` does not permit being left uninitialized
[INFO] [stdout]   --> src/connectfour.rs:16:75
[INFO] [stdout]    |
[INFO] [stdout] 16 |         let mut b = unsafe /* hold on to your hat, 'cause here we go */ { uninitialized::<[Space; WIDTH * HEIGHT]>() };
[INFO] [stdout]    |                                                                           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]    |                                                                           |
[INFO] [stdout]    |                                                                           this code causes undefined behavior when executed
[INFO] [stdout]    |                                                                           help: use `MaybeUninit<T>` instead, and only call `assume_init` after initialization is done
[INFO] [stdout]    |
[INFO] [stdout] note: enums with multiple inhabited variants have to be initialized to a variant
[INFO] [stdout]   --> src/basics.rs:86:1
[INFO] [stdout]    |
[INFO] [stdout] 86 | pub enum Space { Empty, Black, White }
[INFO] [stdout]    | ^^^^^^^^^^^^^^
[INFO] [stdout]    = note: `#[warn(invalid_value)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: hiding a lifetime that's elided elsewhere is confusing
[INFO] [stdout]    --> src/ggp.rs:221:18
[INFO] [stdout]     |
[INFO] [stdout] 221 | fn parse_word(s: &str) -> Parsed<&str> {
[INFO] [stdout]     |                  ^^^^     ^^^^^^^^^^^^
[INFO] [stdout]     |                  |        |      |
[INFO] [stdout]     |                  |        |      the same lifetime is elided here
[INFO] [stdout]     |                  |        the same lifetime is hidden here
[INFO] [stdout]     |                  the lifetime is elided 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: use `'_` for type paths
[INFO] [stdout]     |
[INFO] [stdout] 221 | fn parse_word(s: &str) -> Parsed<'_, &str> {
[INFO] [stdout]     |                                  +++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: hiding a lifetime that's elided elsewhere is confusing
[INFO] [stdout]    --> src/ggp.rs:248:23
[INFO] [stdout]     |
[INFO] [stdout] 248 | pub fn parse_sexpr(s: &str) -> Parsed<SExpr> {
[INFO] [stdout]     |                       ^^^^     ^^^^^^^^^^^^^
[INFO] [stdout]     |                       |        |      |
[INFO] [stdout]     |                       |        |      the same lifetime is hidden here
[INFO] [stdout]     |                       |        the same lifetime is hidden here
[INFO] [stdout]     |                       the lifetime is elided here
[INFO] [stdout]     |
[INFO] [stdout]     = help: the same lifetime is referred to in inconsistent ways, making the signature confusing
[INFO] [stdout] help: use `'_` for type paths
[INFO] [stdout]     |
[INFO] [stdout] 248 | pub fn parse_sexpr(s: &str) -> Parsed<'_, SExpr<'_>> {
[INFO] [stdout]     |                                       +++      ++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: this method call resolves to `<&[T; N] as IntoIterator>::into_iter` (due to backwards compatibility), but will resolve to `<[T; N] as IntoIterator>::into_iter` in Rust 2021
[INFO] [stdout]   --> src/go.rs:28:32
[INFO] [stdout]    |
[INFO] [stdout] 28 |         for &p in neighbors(p).into_iter().flat_map(|x| x) {
[INFO] [stdout]    |                                ^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = warning: this changes meaning in Rust 2021
[INFO] [stdout]    = note: for more information, see <https://doc.rust-lang.org/edition-guide/rust-2021/IntoIterator-for-arrays.html>
[INFO] [stdout]    = note: `#[warn(array_into_iter)]` (part of `#[warn(rust_2021_compatibility)]`) on by default
[INFO] [stdout] help: use `.iter()` instead of `.into_iter()` to avoid ambiguity
[INFO] [stdout]    |
[INFO] [stdout] 28 -         for &p in neighbors(p).into_iter().flat_map(|x| x) {
[INFO] [stdout] 28 +         for &p in neighbors(p).iter().flat_map(|x| x) {
[INFO] [stdout]    |
[INFO] [stdout] help: or use `IntoIterator::into_iter(..)` instead of `.into_iter()` to explicitly iterate by value
[INFO] [stdout]    |
[INFO] [stdout] 28 -         for &p in neighbors(p).into_iter().flat_map(|x| x) {
[INFO] [stdout] 28 +         for &p in IntoIterator::into_iter(neighbors(p)).flat_map(|x| x) {
[INFO] [stdout]    |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: this method call resolves to `<&[T; N] as IntoIterator>::into_iter` (due to backwards compatibility), but will resolve to `<[T; N] as IntoIterator>::into_iter` in Rust 2021
[INFO] [stdout]   --> src/go.rs:60:33
[INFO] [stdout]    |
[INFO] [stdout] 60 |                 if neighbors(p).into_iter().flat_map(|x| x).any(|&p| !capture_inner(c, p, b, captured)) { return false }
[INFO] [stdout]    |                                 ^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = warning: this changes meaning in Rust 2021
[INFO] [stdout]    = note: for more information, see <https://doc.rust-lang.org/edition-guide/rust-2021/IntoIterator-for-arrays.html>
[INFO] [stdout] help: use `.iter()` instead of `.into_iter()` to avoid ambiguity
[INFO] [stdout]    |
[INFO] [stdout] 60 -                 if neighbors(p).into_iter().flat_map(|x| x).any(|&p| !capture_inner(c, p, b, captured)) { return false }
[INFO] [stdout] 60 +                 if neighbors(p).iter().flat_map(|x| x).any(|&p| !capture_inner(c, p, b, captured)) { return false }
[INFO] [stdout]    |
[INFO] [stdout] help: or use `IntoIterator::into_iter(..)` instead of `.into_iter()` to explicitly iterate by value
[INFO] [stdout]    |
[INFO] [stdout] 60 -                 if neighbors(p).into_iter().flat_map(|x| x).any(|&p| !capture_inner(c, p, b, captured)) { return false }
[INFO] [stdout] 60 +                 if IntoIterator::into_iter(neighbors(p)).flat_map(|x| x).any(|&p| !capture_inner(c, p, b, captured)) { return false }
[INFO] [stdout]    |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: this method call resolves to `<&[T; N] as IntoIterator>::into_iter` (due to backwards compatibility), but will resolve to `<[T; N] as IntoIterator>::into_iter` in Rust 2021
[INFO] [stdout]    --> src/go.rs:123:32
[INFO] [stdout]     |
[INFO] [stdout] 123 |         for &p in neighbors(p).into_iter().flat_map(|x| x) {
[INFO] [stdout]     |                                ^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = warning: this changes meaning in Rust 2021
[INFO] [stdout]     = note: for more information, see <https://doc.rust-lang.org/edition-guide/rust-2021/IntoIterator-for-arrays.html>
[INFO] [stdout] help: use `.iter()` instead of `.into_iter()` to avoid ambiguity
[INFO] [stdout]     |
[INFO] [stdout] 123 -         for &p in neighbors(p).into_iter().flat_map(|x| x) {
[INFO] [stdout] 123 +         for &p in neighbors(p).iter().flat_map(|x| x) {
[INFO] [stdout]     |
[INFO] [stdout] help: or use `IntoIterator::into_iter(..)` instead of `.into_iter()` to explicitly iterate by value
[INFO] [stdout]     |
[INFO] [stdout] 123 -         for &p in neighbors(p).into_iter().flat_map(|x| x) {
[INFO] [stdout] 123 +         for &p in IntoIterator::into_iter(neighbors(p)).flat_map(|x| x) {
[INFO] [stdout]     |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: this method call resolves to `<&[T; N] as IntoIterator>::into_iter` (due to backwards compatibility), but will resolve to `<[T; N] as IntoIterator>::into_iter` in Rust 2021
[INFO] [stdout]    --> src/go.rs:136:32
[INFO] [stdout]     |
[INFO] [stdout] 136 |         for &p in neighbors(p).into_iter().flat_map(|x| x) {
[INFO] [stdout]     |                                ^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = warning: this changes meaning in Rust 2021
[INFO] [stdout]     = note: for more information, see <https://doc.rust-lang.org/edition-guide/rust-2021/IntoIterator-for-arrays.html>
[INFO] [stdout] help: use `.iter()` instead of `.into_iter()` to avoid ambiguity
[INFO] [stdout]     |
[INFO] [stdout] 136 -         for &p in neighbors(p).into_iter().flat_map(|x| x) {
[INFO] [stdout] 136 +         for &p in neighbors(p).iter().flat_map(|x| x) {
[INFO] [stdout]     |
[INFO] [stdout] help: or use `IntoIterator::into_iter(..)` instead of `.into_iter()` to explicitly iterate by value
[INFO] [stdout]     |
[INFO] [stdout] 136 -         for &p in neighbors(p).into_iter().flat_map(|x| x) {
[INFO] [stdout] 136 +         for &p in IntoIterator::into_iter(neighbors(p)).flat_map(|x| x) {
[INFO] [stdout]     |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: this method call resolves to `<&[T; N] as IntoIterator>::into_iter` (due to backwards compatibility), but will resolve to `<[T; N] as IntoIterator>::into_iter` in Rust 2021
[INFO] [stdout]    --> src/go.rs:151:25
[INFO] [stdout]     |
[INFO] [stdout] 151 |         if neighbors(p).into_iter().flat_map(|x| x).any(|&p| {
[INFO] [stdout]     |                         ^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = warning: this changes meaning in Rust 2021
[INFO] [stdout]     = note: for more information, see <https://doc.rust-lang.org/edition-guide/rust-2021/IntoIterator-for-arrays.html>
[INFO] [stdout] help: use `.iter()` instead of `.into_iter()` to avoid ambiguity
[INFO] [stdout]     |
[INFO] [stdout] 151 -         if neighbors(p).into_iter().flat_map(|x| x).any(|&p| {
[INFO] [stdout] 151 +         if neighbors(p).iter().flat_map(|x| x).any(|&p| {
[INFO] [stdout]     |
[INFO] [stdout] help: or use `IntoIterator::into_iter(..)` instead of `.into_iter()` to explicitly iterate by value
[INFO] [stdout]     |
[INFO] [stdout] 151 -         if neighbors(p).into_iter().flat_map(|x| x).any(|&p| {
[INFO] [stdout] 151 +         if IntoIterator::into_iter(neighbors(p)).flat_map(|x| x).any(|&p| {
[INFO] [stdout]     |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: this method call resolves to `<&[T; N] as IntoIterator>::into_iter` (due to backwards compatibility), but will resolve to `<[T; N] as IntoIterator>::into_iter` in Rust 2021
[INFO] [stdout]    --> src/go.rs:155:35
[INFO] [stdout]     |
[INFO] [stdout] 155 |                 c => neighbors(p).into_iter().filter_map(|&x| x).filter(|&p| self.board[p] != c.enemy()).count() == 1
[INFO] [stdout]     |                                   ^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = warning: this changes meaning in Rust 2021
[INFO] [stdout]     = note: for more information, see <https://doc.rust-lang.org/edition-guide/rust-2021/IntoIterator-for-arrays.html>
[INFO] [stdout] help: use `.iter()` instead of `.into_iter()` to avoid ambiguity
[INFO] [stdout]     |
[INFO] [stdout] 155 -                 c => neighbors(p).into_iter().filter_map(|&x| x).filter(|&p| self.board[p] != c.enemy()).count() == 1
[INFO] [stdout] 155 +                 c => neighbors(p).iter().filter_map(|&x| x).filter(|&p| self.board[p] != c.enemy()).count() == 1
[INFO] [stdout]     |
[INFO] [stdout] help: or use `IntoIterator::into_iter(..)` instead of `.into_iter()` to explicitly iterate by value
[INFO] [stdout]     |
[INFO] [stdout] 155 -                 c => neighbors(p).into_iter().filter_map(|&x| x).filter(|&p| self.board[p] != c.enemy()).count() == 1
[INFO] [stdout] 155 +                 c => IntoIterator::into_iter(neighbors(p)).filter_map(|&x| x).filter(|&p| self.board[p] != c.enemy()).count() == 1
[INFO] [stdout]     |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished `dev` profile [unoptimized + debuginfo] target(s) in 21.61s
[INFO] [stderr] warning: the following packages contain code that will be rejected by a future version of Rust: criterion v0.2.7
[INFO] [stderr] note: to see what the problems were, use the option `--future-incompat-report`, or run `cargo report future-incompatibilities --id 6`
[INFO] running `Command { std: "docker" "inspect" "8e9536cb343ece2eaad79138e9e5af512b803153e8b9cf84e37a4c45414a4bc4", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "8e9536cb343ece2eaad79138e9e5af512b803153e8b9cf84e37a4c45414a4bc4", kill_on_drop: false }`
[INFO] [stdout] 8e9536cb343ece2eaad79138e9e5af512b803153e8b9cf84e37a4c45414a4bc4
