[INFO] cloning repository https://github.com/andresilva/rust-okasaki
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/andresilva/rust-okasaki" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fandresilva%2Frust-okasaki", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fandresilva%2Frust-okasaki'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] da0f298d49be46ba9899f78944ec2b0fbbf64885
[INFO] checking andresilva/rust-okasaki/da0f298d49be46ba9899f78944ec2b0fbbf64885 against master#f609b7e0586f81fefb3523e3e17adf779ac416be for pr-129466-2
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fandresilva%2Frust-okasaki" "/workspace/builds/worker-5-tc1/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-5-tc1/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/andresilva/rust-okasaki on toolchain f609b7e0586f81fefb3523e3e17adf779ac416be
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+f609b7e0586f81fefb3523e3e17adf779ac416be" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/andresilva/rust-okasaki
[INFO] finished tweaking git repo https://github.com/andresilva/rust-okasaki
[INFO] tweaked toml for git repo https://github.com/andresilva/rust-okasaki written to /workspace/builds/worker-5-tc1/source/Cargo.toml
[INFO] crate git repo https://github.com/andresilva/rust-okasaki 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" "+f609b7e0586f81fefb3523e3e17adf779ac416be" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr] warning: no edition set: defaulting to the 2015 edition while the latest is 2021
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-5-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-5-tc1/source:/opt/rustwide/workdir:ro,Z" "-v" "/var/lib/crater-agent-workspace/cargo-home:/opt/rustwide/cargo-home:ro,Z" "-v" "/var/lib/crater-agent-workspace/rustup-home:/opt/rustwide/rustup-home:ro,Z" "-e" "SOURCE_DIR=/opt/rustwide/workdir" "-e" "CARGO_TARGET_DIR=/opt/rustwide/target" "-e" "CARGO_HOME=/opt/rustwide/cargo-home" "-e" "RUSTUP_HOME=/opt/rustwide/rustup-home" "-w" "/opt/rustwide/workdir" "-m" "1610612736" "--user" "0:0" "--network" "none" "ghcr.io/rust-lang/crates-build-env/linux@sha256:6252d7ea7fb8caaf7af6d800c5fb250a9cd862b9a7f9508afb3c54fa7fe1102e" "/opt/rustwide/cargo-home/bin/cargo" "+f609b7e0586f81fefb3523e3e17adf779ac416be" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 6036bc0d0f0db59a7899b103d10c4bda2873a03dac18970c96708b981d7fbce9
[INFO] running `Command { std: "docker" "start" "-a" "6036bc0d0f0db59a7899b103d10c4bda2873a03dac18970c96708b981d7fbce9", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "6036bc0d0f0db59a7899b103d10c4bda2873a03dac18970c96708b981d7fbce9", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "6036bc0d0f0db59a7899b103d10c4bda2873a03dac18970c96708b981d7fbce9", kill_on_drop: false }`
[INFO] [stdout] 6036bc0d0f0db59a7899b103d10c4bda2873a03dac18970c96708b981d7fbce9
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-5-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-5-tc1/source:/opt/rustwide/workdir:ro,Z" "-v" "/var/lib/crater-agent-workspace/cargo-home:/opt/rustwide/cargo-home:ro,Z" "-v" "/var/lib/crater-agent-workspace/rustup-home:/opt/rustwide/rustup-home:ro,Z" "-e" "SOURCE_DIR=/opt/rustwide/workdir" "-e" "CARGO_TARGET_DIR=/opt/rustwide/target" "-e" "CARGO_INCREMENTAL=0" "-e" "RUST_BACKTRACE=full" "-e" "RUSTFLAGS=--cap-lints=forbid" "-e" "RUSTDOCFLAGS=--cap-lints=forbid" "-e" "CARGO_HOME=/opt/rustwide/cargo-home" "-e" "RUSTUP_HOME=/opt/rustwide/rustup-home" "-w" "/opt/rustwide/workdir" "-m" "1610612736" "--user" "0:0" "--network" "none" "ghcr.io/rust-lang/crates-build-env/linux@sha256:6252d7ea7fb8caaf7af6d800c5fb250a9cd862b9a7f9508afb3c54fa7fe1102e" "/opt/rustwide/cargo-home/bin/cargo" "+f609b7e0586f81fefb3523e3e17adf779ac416be" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 8fbb8d5580aa8fb5509e0f95d9ee3259dea3d32b0a8aa3a252a2673257899238
[INFO] running `Command { std: "docker" "start" "-a" "8fbb8d5580aa8fb5509e0f95d9ee3259dea3d32b0a8aa3a252a2673257899238", kill_on_drop: false }`
[INFO] [stderr] warning: no edition set: defaulting to the 2015 edition while the latest is 2021
[INFO] [stderr]     Checking okasaki v0.0.1 (/opt/rustwide/workdir)
[INFO] [stdout] error[E0432]: unresolved import `std::num::Int`
[INFO] [stdout]  --> src/tree.rs:3:5
[INFO] [stdout]   |
[INFO] [stdout] 3 | use std::num::Int;
[INFO] [stdout]   |     ^^^^^^^^^^^^^ no `Int` in `num`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0432]: unresolved import `std::num::Float`
[INFO] [stdout]  --> src/tree_layout.rs:2:5
[INFO] [stdout]   |
[INFO] [stdout] 2 | use std::num::Float;
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^ no `Float` in `num`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0432]: unresolved import `std::num::Int`
[INFO] [stdout]  --> src/tree.rs:3:5
[INFO] [stdout]   |
[INFO] [stdout] 3 | use std::num::Int;
[INFO] [stdout]   |     ^^^^^^^^^^^^^ no `Int` in `num`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0432]: unresolved import `std::num::Float`
[INFO] [stdout]  --> src/tree_layout.rs:2:5
[INFO] [stdout]   |
[INFO] [stdout] 2 | use std::num::Float;
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^ no `Float` in `num`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: anonymous parameters are deprecated and will be removed in the next edition
[INFO] [stdout]  --> src/heap.rs:9:21
[INFO] [stdout]   |
[INFO] [stdout] 9 |     fn merge(&self, &Self) -> Self;
[INFO] [stdout]   |                     ^^^^^ help: try naming the parameter or explicitly ignoring it: `_: &Self`
[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 issue #41686 <https://github.com/rust-lang/rust/issues/41686>
[INFO] [stdout]   = note: `#[warn(anonymous_parameters)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: anonymous parameters are deprecated and will be removed in the next edition
[INFO] [stdout]   --> src/heap.rs:10:22
[INFO] [stdout]    |
[INFO] [stdout] 10 |     fn insert(&self, T) -> Self;
[INFO] [stdout]    |                      ^ help: try naming the parameter or explicitly ignoring it: `_: T`
[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 issue #41686 <https://github.com/rust-lang/rust/issues/41686>
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: use of deprecated macro `try`: use the `?` operator instead
[INFO] [stdout]   --> src/heap.rs:87:21
[INFO] [stdout]    |
[INFO] [stdout] 87 |                     try!(aux(f, r, true, &(indent.to_string() + if right { "        " } else { " |      " })));
[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/heap.rs:89:21
[INFO] [stdout]    |
[INFO] [stdout] 89 |                     try!(write!(f, "{}", indent));
[INFO] [stdout]    |                     ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: use of deprecated macro `try`: use the `?` operator instead
[INFO] [stdout]   --> src/heap.rs:90:21
[INFO] [stdout]    |
[INFO] [stdout] 90 |                     try!(if right { write!(f, "{}", " /") } else { write!(f, "{}", " \\") });
[INFO] [stdout]    |                     ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: use of deprecated macro `try`: use the `?` operator instead
[INFO] [stdout]   --> src/heap.rs:91:21
[INFO] [stdout]    |
[INFO] [stdout] 91 |                     try!(write!(f, "{}", "----- "));
[INFO] [stdout]    |                     ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: use of deprecated macro `try`: use the `?` operator instead
[INFO] [stdout]   --> src/heap.rs:93:21
[INFO] [stdout]    |
[INFO] [stdout] 93 |                     try!(writeln!(f, "(#{}, {})", rank, x));
[INFO] [stdout]    |                     ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: use of deprecated macro `try`: use the `?` operator instead
[INFO] [stdout]   --> src/heap.rs:98:21
[INFO] [stdout]    |
[INFO] [stdout] 98 |                     try!(write!(f, "{}", indent));
[INFO] [stdout]    |                     ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: use of deprecated macro `try`: use the `?` operator instead
[INFO] [stdout]   --> src/heap.rs:99:21
[INFO] [stdout]    |
[INFO] [stdout] 99 |                     try!(if right { write!(f, "{}", " /") } else { write!(f, "{}", " \\") });
[INFO] [stdout]    |                     ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: use of deprecated macro `try`: use the `?` operator instead
[INFO] [stdout]    --> src/heap.rs:100:21
[INFO] [stdout]     |
[INFO] [stdout] 100 |                     try!(write!(f, "{}", "----- "));
[INFO] [stdout]     |                     ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: use of deprecated macro `try`: use the `?` operator instead
[INFO] [stdout]    --> src/heap.rs:109:17
[INFO] [stdout]     |
[INFO] [stdout] 109 |                 try!(aux(f, r, true, ""));
[INFO] [stdout]     |                 ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: use of deprecated macro `try`: use the `?` operator instead
[INFO] [stdout]    --> src/heap.rs:110:17
[INFO] [stdout]     |
[INFO] [stdout] 110 |                 try!(writeln!(f, "(#{}, {})", rank, x));
[INFO] [stdout]     |                 ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unnecessary parentheses around `if` condition
[INFO] [stdout]    --> src/heap.rs:184:16
[INFO] [stdout]     |
[INFO] [stdout] 184 |             if (root(t) < root(&t1)) {
[INFO] [stdout]     |                ^                   ^
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unused_parens)]` on by default
[INFO] [stdout] help: remove these parentheses
[INFO] [stdout]     |
[INFO] [stdout] 184 -             if (root(t) < root(&t1)) {
[INFO] [stdout] 184 +             if root(t) < root(&t1) {
[INFO] [stdout]     |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: anonymous parameters are deprecated and will be removed in the next edition
[INFO] [stdout]  --> src/map.rs:8:20
[INFO] [stdout]   |
[INFO] [stdout] 8 |     fn bind(&self, K, V) -> Self;
[INFO] [stdout]   |                    ^ help: try naming the parameter or explicitly ignoring it: `_: K`
[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 issue #41686 <https://github.com/rust-lang/rust/issues/41686>
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: anonymous parameters are deprecated and will be removed in the next edition
[INFO] [stdout]  --> src/map.rs:8:23
[INFO] [stdout]   |
[INFO] [stdout] 8 |     fn bind(&self, K, V) -> Self;
[INFO] [stdout]   |                       ^ help: try naming the parameter or explicitly ignoring it: `_: V`
[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 issue #41686 <https://github.com/rust-lang/rust/issues/41686>
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: anonymous parameters are deprecated and will be removed in the next edition
[INFO] [stdout]  --> src/map.rs:9:22
[INFO] [stdout]   |
[INFO] [stdout] 9 |     fn lookup(&self, K) -> V;
[INFO] [stdout]   |                      ^ help: try naming the parameter or explicitly ignoring it: `_: K`
[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 issue #41686 <https://github.com/rust-lang/rust/issues/41686>
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: anonymous parameters are deprecated and will be removed in the next edition
[INFO] [stdout]  --> src/set.rs:8:22
[INFO] [stdout]   |
[INFO] [stdout] 8 |     fn insert(&self, T) -> Self;
[INFO] [stdout]   |                      ^ help: try naming the parameter or explicitly ignoring it: `_: T`
[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 issue #41686 <https://github.com/rust-lang/rust/issues/41686>
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: anonymous parameters are deprecated and will be removed in the next edition
[INFO] [stdout]  --> src/set.rs:9:22
[INFO] [stdout]   |
[INFO] [stdout] 9 |     fn member(&self, T) -> bool;
[INFO] [stdout]   |                      ^ help: try naming the parameter or explicitly ignoring it: `_: T`
[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 issue #41686 <https://github.com/rust-lang/rust/issues/41686>
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: anonymous parameters are deprecated and will be removed in the next edition
[INFO] [stdout]  --> src/stack.rs:8:20
[INFO] [stdout]   |
[INFO] [stdout] 8 |     fn cons(&self, T) -> Self;
[INFO] [stdout]   |                    ^ help: try naming the parameter or explicitly ignoring it: `_: T`
[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 issue #41686 <https://github.com/rust-lang/rust/issues/41686>
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: use of deprecated macro `try`: use the `?` operator instead
[INFO] [stdout]   --> src/stack.rs:77:9
[INFO] [stdout]    |
[INFO] [stdout] 77 |         try!(write!(f, "["));
[INFO] [stdout]    |         ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: use of deprecated macro `try`: use the `?` operator instead
[INFO] [stdout]   --> src/stack.rs:91:9
[INFO] [stdout]    |
[INFO] [stdout] 91 |         try!(_loop(f, self, true));
[INFO] [stdout]    |         ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: use of deprecated macro `try`: use the `?` operator instead
[INFO] [stdout]   --> src/stack.rs:82:32
[INFO] [stdout]    |
[INFO] [stdout] 82 |                     if first { try!(write!(f, "{}", h)); }
[INFO] [stdout]    |                                ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: use of deprecated macro `try`: use the `?` operator instead
[INFO] [stdout]   --> src/stack.rs:83:28
[INFO] [stdout]    |
[INFO] [stdout] 83 |                     else { try!(write!(f, ", {}", h)); }
[INFO] [stdout]    |                            ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `std::cmp::max`
[INFO] [stdout]  --> src/tree.rs:1:5
[INFO] [stdout]   |
[INFO] [stdout] 1 | use std::cmp::max;
[INFO] [stdout]   |     ^^^^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: use of deprecated macro `try`: use the `?` operator instead
[INFO] [stdout]   --> src/tree.rs:19:21
[INFO] [stdout]    |
[INFO] [stdout] 19 |                     try!(aux(f, r, true, &(indent.to_string() + if right { "        " } else { " |      " })));
[INFO] [stdout]    |                     ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: use of deprecated macro `try`: use the `?` operator instead
[INFO] [stdout]   --> src/tree.rs:21:21
[INFO] [stdout]    |
[INFO] [stdout] 21 |                     try!(write!(f, "{}", indent));
[INFO] [stdout]    |                     ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: use of deprecated macro `try`: use the `?` operator instead
[INFO] [stdout]   --> src/tree.rs:22:21
[INFO] [stdout]    |
[INFO] [stdout] 22 |                     try!(if right { write!(f, "{}", " /") } else { write!(f, "{}", " \\") });
[INFO] [stdout]    |                     ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: use of deprecated macro `try`: use the `?` operator instead
[INFO] [stdout]   --> src/tree.rs:23:21
[INFO] [stdout]    |
[INFO] [stdout] 23 |                     try!(write!(f, "{}", "----- "));
[INFO] [stdout]    |                     ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: use of deprecated macro `try`: use the `?` operator instead
[INFO] [stdout]   --> src/tree.rs:25:21
[INFO] [stdout]    |
[INFO] [stdout] 25 |                     try!(writeln!(f, "({})", x));
[INFO] [stdout]    |                     ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: use of deprecated macro `try`: use the `?` operator instead
[INFO] [stdout]   --> src/tree.rs:30:21
[INFO] [stdout]    |
[INFO] [stdout] 30 |                     try!(write!(f, "{}", indent));
[INFO] [stdout]    |                     ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: use of deprecated macro `try`: use the `?` operator instead
[INFO] [stdout]   --> src/tree.rs:31:21
[INFO] [stdout]    |
[INFO] [stdout] 31 |                     try!(if right { write!(f, "{}", " /") } else { write!(f, "{}", " \\") });
[INFO] [stdout]    |                     ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: use of deprecated macro `try`: use the `?` operator instead
[INFO] [stdout]   --> src/tree.rs:32:21
[INFO] [stdout]    |
[INFO] [stdout] 32 |                     try!(write!(f, "{}", "----- "));
[INFO] [stdout]    |                     ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: use of deprecated macro `try`: use the `?` operator instead
[INFO] [stdout]   --> src/tree.rs:41:17
[INFO] [stdout]    |
[INFO] [stdout] 41 |                 try!(aux(f, r, true, ""));
[INFO] [stdout]    |                 ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: use of deprecated macro `try`: use the `?` operator instead
[INFO] [stdout]   --> src/tree.rs:42:17
[INFO] [stdout]    |
[INFO] [stdout] 42 |                 try!(writeln!(f, "({})", x));
[INFO] [stdout]    |                 ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unnecessary parentheses around `for` iterator expression
[INFO] [stdout]   --> src/tree_layout.rs:14:18
[INFO] [stdout]    |
[INFO] [stdout] 14 |         for _ in (0..n) {
[INFO] [stdout]    |                  ^    ^
[INFO] [stdout]    |
[INFO] [stdout] help: remove these parentheses
[INFO] [stdout]    |
[INFO] [stdout] 14 -         for _ in (0..n) {
[INFO] [stdout] 14 +         for _ in 0..n {
[INFO] [stdout]    |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: use of deprecated macro `try`: use the `?` operator instead
[INFO] [stdout]    --> src/trie.rs:115:21
[INFO] [stdout]     |
[INFO] [stdout] 115 |                     try!(write!(f, "{}", indent));
[INFO] [stdout]     |                     ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: use of deprecated macro `try`: use the `?` operator instead
[INFO] [stdout]    --> src/trie.rs:125:21
[INFO] [stdout]     |
[INFO] [stdout] 125 |                     try!(write!(f, "{}", key));
[INFO] [stdout]     |                     ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: use of deprecated macro `try`: use the `?` operator instead
[INFO] [stdout]    --> src/trie.rs:132:21
[INFO] [stdout]     |
[INFO] [stdout] 132 |                     try!(writeln!(f, ""));
[INFO] [stdout]     |                     ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: use of deprecated macro `try`: use the `?` operator instead
[INFO] [stdout]    --> src/trie.rs:118:25
[INFO] [stdout]     |
[INFO] [stdout] 118 |                         try!(write!(f, "\\-"));
[INFO] [stdout]     |                         ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: use of deprecated macro `try`: use the `?` operator instead
[INFO] [stdout]    --> src/trie.rs:121:25
[INFO] [stdout]     |
[INFO] [stdout] 121 |                         try!(write!(f, "|-"));
[INFO] [stdout]     |                         ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: use of deprecated macro `try`: use the `?` operator instead
[INFO] [stdout]    --> src/trie.rs:128:40
[INFO] [stdout]     |
[INFO] [stdout] 128 |                         Some(ref v) => try!(write!(f, " => ({})", v)),
[INFO] [stdout]     |                                        ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: use of deprecated macro `try`: use the `?` operator instead
[INFO] [stdout]    --> src/trie.rs:135:25
[INFO] [stdout]     |
[INFO] [stdout] 135 |                         try!(aux(c, indent.clone(), i == children.len() - 1, f));
[INFO] [stdout]     |                         ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: anonymous parameters are deprecated and will be removed in the next edition
[INFO] [stdout]  --> src/heap.rs:9:21
[INFO] [stdout]   |
[INFO] [stdout] 9 |     fn merge(&self, &Self) -> Self;
[INFO] [stdout]   |                     ^^^^^ help: try naming the parameter or explicitly ignoring it: `_: &Self`
[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 issue #41686 <https://github.com/rust-lang/rust/issues/41686>
[INFO] [stdout]   = note: `#[warn(anonymous_parameters)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: anonymous parameters are deprecated and will be removed in the next edition
[INFO] [stdout]   --> src/heap.rs:10:22
[INFO] [stdout]    |
[INFO] [stdout] 10 |     fn insert(&self, T) -> Self;
[INFO] [stdout]    |                      ^ help: try naming the parameter or explicitly ignoring it: `_: T`
[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 issue #41686 <https://github.com/rust-lang/rust/issues/41686>
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: use of deprecated macro `try`: use the `?` operator instead
[INFO] [stdout]   --> src/heap.rs:87:21
[INFO] [stdout]    |
[INFO] [stdout] 87 |                     try!(aux(f, r, true, &(indent.to_string() + if right { "        " } else { " |      " })));
[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/heap.rs:89:21
[INFO] [stdout]    |
[INFO] [stdout] 89 |                     try!(write!(f, "{}", indent));
[INFO] [stdout]    |                     ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: use of deprecated macro `try`: use the `?` operator instead
[INFO] [stdout]   --> src/heap.rs:90:21
[INFO] [stdout]    |
[INFO] [stdout] 90 |                     try!(if right { write!(f, "{}", " /") } else { write!(f, "{}", " \\") });
[INFO] [stdout]    |                     ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: use of deprecated macro `try`: use the `?` operator instead
[INFO] [stdout]   --> src/heap.rs:91:21
[INFO] [stdout]    |
[INFO] [stdout] 91 |                     try!(write!(f, "{}", "----- "));
[INFO] [stdout]    |                     ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: use of deprecated macro `try`: use the `?` operator instead
[INFO] [stdout]   --> src/heap.rs:93:21
[INFO] [stdout]    |
[INFO] [stdout] 93 |                     try!(writeln!(f, "(#{}, {})", rank, x));
[INFO] [stdout]    |                     ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: use of deprecated macro `try`: use the `?` operator instead
[INFO] [stdout]   --> src/heap.rs:98:21
[INFO] [stdout]    |
[INFO] [stdout] 98 |                     try!(write!(f, "{}", indent));
[INFO] [stdout]    |                     ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: use of deprecated macro `try`: use the `?` operator instead
[INFO] [stdout]   --> src/heap.rs:99:21
[INFO] [stdout]    |
[INFO] [stdout] 99 |                     try!(if right { write!(f, "{}", " /") } else { write!(f, "{}", " \\") });
[INFO] [stdout]    |                     ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: use of deprecated macro `try`: use the `?` operator instead
[INFO] [stdout]    --> src/heap.rs:100:21
[INFO] [stdout]     |
[INFO] [stdout] 100 |                     try!(write!(f, "{}", "----- "));
[INFO] [stdout]     |                     ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: use of deprecated macro `try`: use the `?` operator instead
[INFO] [stdout]    --> src/heap.rs:109:17
[INFO] [stdout]     |
[INFO] [stdout] 109 |                 try!(aux(f, r, true, ""));
[INFO] [stdout]     |                 ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: use of deprecated macro `try`: use the `?` operator instead
[INFO] [stdout]    --> src/heap.rs:110:17
[INFO] [stdout]     |
[INFO] [stdout] 110 |                 try!(writeln!(f, "(#{}, {})", rank, x));
[INFO] [stdout]     |                 ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unnecessary parentheses around `if` condition
[INFO] [stdout]    --> src/heap.rs:184:16
[INFO] [stdout]     |
[INFO] [stdout] 184 |             if (root(t) < root(&t1)) {
[INFO] [stdout]     |                ^                   ^
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unused_parens)]` on by default
[INFO] [stdout] help: remove these parentheses
[INFO] [stdout]     |
[INFO] [stdout] 184 -             if (root(t) < root(&t1)) {
[INFO] [stdout] 184 +             if root(t) < root(&t1) {
[INFO] [stdout]     |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: anonymous parameters are deprecated and will be removed in the next edition
[INFO] [stdout]  --> src/map.rs:8:20
[INFO] [stdout]   |
[INFO] [stdout] 8 |     fn bind(&self, K, V) -> Self;
[INFO] [stdout]   |                    ^ help: try naming the parameter or explicitly ignoring it: `_: K`
[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 issue #41686 <https://github.com/rust-lang/rust/issues/41686>
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: anonymous parameters are deprecated and will be removed in the next edition
[INFO] [stdout]  --> src/map.rs:8:23
[INFO] [stdout]   |
[INFO] [stdout] 8 |     fn bind(&self, K, V) -> Self;
[INFO] [stdout]   |                       ^ help: try naming the parameter or explicitly ignoring it: `_: V`
[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 issue #41686 <https://github.com/rust-lang/rust/issues/41686>
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: anonymous parameters are deprecated and will be removed in the next edition
[INFO] [stdout]  --> src/map.rs:9:22
[INFO] [stdout]   |
[INFO] [stdout] 9 |     fn lookup(&self, K) -> V;
[INFO] [stdout]   |                      ^ help: try naming the parameter or explicitly ignoring it: `_: K`
[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 issue #41686 <https://github.com/rust-lang/rust/issues/41686>
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: anonymous parameters are deprecated and will be removed in the next edition
[INFO] [stdout]  --> src/set.rs:8:22
[INFO] [stdout]   |
[INFO] [stdout] 8 |     fn insert(&self, T) -> Self;
[INFO] [stdout]   |                      ^ help: try naming the parameter or explicitly ignoring it: `_: T`
[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 issue #41686 <https://github.com/rust-lang/rust/issues/41686>
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: anonymous parameters are deprecated and will be removed in the next edition
[INFO] [stdout]  --> src/set.rs:9:22
[INFO] [stdout]   |
[INFO] [stdout] 9 |     fn member(&self, T) -> bool;
[INFO] [stdout]   |                      ^ help: try naming the parameter or explicitly ignoring it: `_: T`
[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 issue #41686 <https://github.com/rust-lang/rust/issues/41686>
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: anonymous parameters are deprecated and will be removed in the next edition
[INFO] [stdout]  --> src/stack.rs:8:20
[INFO] [stdout]   |
[INFO] [stdout] 8 |     fn cons(&self, T) -> Self;
[INFO] [stdout]   |                    ^ help: try naming the parameter or explicitly ignoring it: `_: T`
[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 issue #41686 <https://github.com/rust-lang/rust/issues/41686>
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: use of deprecated macro `try`: use the `?` operator instead
[INFO] [stdout]   --> src/stack.rs:77:9
[INFO] [stdout]    |
[INFO] [stdout] 77 |         try!(write!(f, "["));
[INFO] [stdout]    |         ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: use of deprecated macro `try`: use the `?` operator instead
[INFO] [stdout]   --> src/stack.rs:91:9
[INFO] [stdout]    |
[INFO] [stdout] 91 |         try!(_loop(f, self, true));
[INFO] [stdout]    |         ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: use of deprecated macro `try`: use the `?` operator instead
[INFO] [stdout]   --> src/stack.rs:82:32
[INFO] [stdout]    |
[INFO] [stdout] 82 |                     if first { try!(write!(f, "{}", h)); }
[INFO] [stdout]    |                                ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: use of deprecated macro `try`: use the `?` operator instead
[INFO] [stdout]   --> src/stack.rs:83:28
[INFO] [stdout]    |
[INFO] [stdout] 83 |                     else { try!(write!(f, ", {}", h)); }
[INFO] [stdout]    |                            ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `std::cmp::max`
[INFO] [stdout]  --> src/tree.rs:1:5
[INFO] [stdout]   |
[INFO] [stdout] 1 | use std::cmp::max;
[INFO] [stdout]   |     ^^^^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: use of deprecated macro `try`: use the `?` operator instead
[INFO] [stdout]   --> src/tree.rs:19:21
[INFO] [stdout]    |
[INFO] [stdout] 19 |                     try!(aux(f, r, true, &(indent.to_string() + if right { "        " } else { " |      " })));
[INFO] [stdout]    |                     ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: use of deprecated macro `try`: use the `?` operator instead
[INFO] [stdout]   --> src/tree.rs:21:21
[INFO] [stdout]    |
[INFO] [stdout] 21 |                     try!(write!(f, "{}", indent));
[INFO] [stdout]    |                     ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: use of deprecated macro `try`: use the `?` operator instead
[INFO] [stdout]   --> src/tree.rs:22:21
[INFO] [stdout]    |
[INFO] [stdout] 22 |                     try!(if right { write!(f, "{}", " /") } else { write!(f, "{}", " \\") });
[INFO] [stdout]    |                     ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: use of deprecated macro `try`: use the `?` operator instead
[INFO] [stdout]   --> src/tree.rs:23:21
[INFO] [stdout]    |
[INFO] [stdout] 23 |                     try!(write!(f, "{}", "----- "));
[INFO] [stdout]    |                     ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: use of deprecated macro `try`: use the `?` operator instead
[INFO] [stdout]   --> src/tree.rs:25:21
[INFO] [stdout]    |
[INFO] [stdout] 25 |                     try!(writeln!(f, "({})", x));
[INFO] [stdout]    |                     ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: use of deprecated macro `try`: use the `?` operator instead
[INFO] [stdout]   --> src/tree.rs:30:21
[INFO] [stdout]    |
[INFO] [stdout] 30 |                     try!(write!(f, "{}", indent));
[INFO] [stdout]    |                     ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: use of deprecated macro `try`: use the `?` operator instead
[INFO] [stdout]   --> src/tree.rs:31:21
[INFO] [stdout]    |
[INFO] [stdout] 31 |                     try!(if right { write!(f, "{}", " /") } else { write!(f, "{}", " \\") });
[INFO] [stdout]    |                     ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: use of deprecated macro `try`: use the `?` operator instead
[INFO] [stdout]   --> src/tree.rs:32:21
[INFO] [stdout]    |
[INFO] [stdout] 32 |                     try!(write!(f, "{}", "----- "));
[INFO] [stdout]    |                     ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: use of deprecated macro `try`: use the `?` operator instead
[INFO] [stdout]   --> src/tree.rs:41:17
[INFO] [stdout]    |
[INFO] [stdout] 41 |                 try!(aux(f, r, true, ""));
[INFO] [stdout]    |                 ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: use of deprecated macro `try`: use the `?` operator instead
[INFO] [stdout]   --> src/tree.rs:42:17
[INFO] [stdout]    |
[INFO] [stdout] 42 |                 try!(writeln!(f, "({})", x));
[INFO] [stdout]    |                 ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unnecessary parentheses around `for` iterator expression
[INFO] [stdout]   --> src/tree_layout.rs:14:18
[INFO] [stdout]    |
[INFO] [stdout] 14 |         for _ in (0..n) {
[INFO] [stdout]    |                  ^    ^
[INFO] [stdout]    |
[INFO] [stdout] help: remove these parentheses
[INFO] [stdout]    |
[INFO] [stdout] 14 -         for _ in (0..n) {
[INFO] [stdout] 14 +         for _ in 0..n {
[INFO] [stdout]    |
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: use of deprecated macro `try`: use the `?` operator instead
[INFO] [stdout]    --> src/trie.rs:115:21
[INFO] [stdout]     |
[INFO] [stdout] 115 |                     try!(write!(f, "{}", indent));
[INFO] [stdout]     |                     ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: use of deprecated macro `try`: use the `?` operator instead
[INFO] [stdout]    --> src/trie.rs:125:21
[INFO] [stdout]     |
[INFO] [stdout] 125 |                     try!(write!(f, "{}", key));
[INFO] [stdout]     |                     ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: use of deprecated macro `try`: use the `?` operator instead
[INFO] [stdout]    --> src/trie.rs:132:21
[INFO] [stdout]     |
[INFO] [stdout] 132 |                     try!(writeln!(f, ""));
[INFO] [stdout]     |                     ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: use of deprecated macro `try`: use the `?` operator instead
[INFO] [stdout]    --> src/trie.rs:118:25
[INFO] [stdout]     |
[INFO] [stdout] 118 |                         try!(write!(f, "\\-"));
[INFO] [stdout]     |                         ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: use of deprecated macro `try`: use the `?` operator instead
[INFO] [stdout]    --> src/trie.rs:121:25
[INFO] [stdout]     |
[INFO] [stdout] 121 |                         try!(write!(f, "|-"));
[INFO] [stdout]     |                         ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: use of deprecated macro `try`: use the `?` operator instead
[INFO] [stdout]    --> src/trie.rs:128:40
[INFO] [stdout]     |
[INFO] [stdout] 128 |                         Some(ref v) => try!(write!(f, " => ({})", v)),
[INFO] [stdout]     |                                        ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: use of deprecated macro `try`: use the `?` operator instead
[INFO] [stdout]    --> src/trie.rs:135:25
[INFO] [stdout]     |
[INFO] [stdout] 135 |                         try!(aux(c, indent.clone(), i == children.len() - 1, f));
[INFO] [stdout]     |                         ^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0599]: no method named `tail` found for struct `Vec<Tree<(T, f64)>>` in the current scope
[INFO] [stdout]   --> src/tree_layout.rs:45:29
[INFO] [stdout]    |
[INFO] [stdout] 45 |                 aux(current.tail().to_vec(), next, o);
[INFO] [stdout]    |                             ^^^^ method not found in `Vec<Tree<(T, f64)>>`
[INFO] [stdout]    |
[INFO] [stdout]    = help: items from traits can only be used if the trait is implemented and in scope
[INFO] [stdout] note: `Stack` defines an item `tail`, perhaps you need to implement it
[INFO] [stdout]   --> src/stack.rs:4:1
[INFO] [stdout]    |
[INFO] [stdout] 4  | pub trait Stack<T> {
[INFO] [stdout]    | ^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0599]: no method named `tail` found for struct `Vec<Tree<(T, f64)>>` in the current scope
[INFO] [stdout]   --> src/tree_layout.rs:45:29
[INFO] [stdout]    |
[INFO] [stdout] 45 |                 aux(current.tail().to_vec(), next, o);
[INFO] [stdout]    |                             ^^^^ method not found in `Vec<Tree<(T, f64)>>`
[INFO] [stdout]    |
[INFO] [stdout]    = help: items from traits can only be used if the trait is implemented and in scope
[INFO] [stdout] note: `Stack` defines an item `tail`, perhaps you need to implement it
[INFO] [stdout]   --> src/stack.rs:4:1
[INFO] [stdout]    |
[INFO] [stdout] 4  | pub trait Stack<T> {
[INFO] [stdout]    | ^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0599]: no method named `tail` found for struct `Vec<Vec<(f64, f64)>>` in the current scope
[INFO] [stdout]    --> src/tree_layout.rs:172:36
[INFO] [stdout]     |
[INFO] [stdout] 172 |                 let mut r = aux(es.tail().to_vec(), merge_extent(acc.clone(), move_extent(e.clone().to_vec(), x)));
[INFO] [stdout]     |                                    ^^^^ method not found in `Vec<Vec<(f64, f64)>>`
[INFO] [stdout]     |
[INFO] [stdout]     = help: items from traits can only be used if the trait is implemented and in scope
[INFO] [stdout] note: `Stack` defines an item `tail`, perhaps you need to implement it
[INFO] [stdout]    --> src/stack.rs:4:1
[INFO] [stdout]     |
[INFO] [stdout] 4   | pub trait Stack<T> {
[INFO] [stdout]     | ^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0599]: no method named `tail` found for struct `Vec<(f64, f64)>` in the current scope
[INFO] [stdout]    --> src/tree_layout.rs:189:25
[INFO] [stdout]     |
[INFO] [stdout] 189 |             rmax(fit(e1.tail().to_vec(), e2.tail().to_vec()), p - q + 1.0),
[INFO] [stdout]     |                         ^^^^ method not found in `Vec<(f64, f64)>`
[INFO] [stdout]     |
[INFO] [stdout]     = help: items from traits can only be used if the trait is implemented and in scope
[INFO] [stdout] note: `Stack` defines an item `tail`, perhaps you need to implement it
[INFO] [stdout]    --> src/stack.rs:4:1
[INFO] [stdout]     |
[INFO] [stdout] 4   | pub trait Stack<T> {
[INFO] [stdout]     | ^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0599]: no method named `tail` found for struct `Vec<(f64, f64)>` in the current scope
[INFO] [stdout]    --> src/tree_layout.rs:189:45
[INFO] [stdout]     |
[INFO] [stdout] 189 |             rmax(fit(e1.tail().to_vec(), e2.tail().to_vec()), p - q + 1.0),
[INFO] [stdout]     |                                             ^^^^ method not found in `Vec<(f64, f64)>`
[INFO] [stdout]     |
[INFO] [stdout]     = help: items from traits can only be used if the trait is implemented and in scope
[INFO] [stdout] note: `Stack` defines an item `tail`, perhaps you need to implement it
[INFO] [stdout]    --> src/stack.rs:4:1
[INFO] [stdout]     |
[INFO] [stdout] 4   | pub trait Stack<T> {
[INFO] [stdout]     | ^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0599]: no method named `tail` found for struct `Vec<(f64, f64)>` in the current scope
[INFO] [stdout]    --> src/tree_layout.rs:199:41
[INFO] [stdout]     |
[INFO] [stdout] 199 |             let mut m = merge_extent(e1.tail().to_vec(), e2.tail().to_vec());
[INFO] [stdout]     |                                         ^^^^ method not found in `Vec<(f64, f64)>`
[INFO] [stdout]     |
[INFO] [stdout]     = help: items from traits can only be used if the trait is implemented and in scope
[INFO] [stdout] note: `Stack` defines an item `tail`, perhaps you need to implement it
[INFO] [stdout]    --> src/stack.rs:4:1
[INFO] [stdout]     |
[INFO] [stdout] 4   | pub trait Stack<T> {
[INFO] [stdout]     | ^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0599]: no method named `tail` found for struct `Vec<Vec<(f64, f64)>>` in the current scope
[INFO] [stdout]    --> src/tree_layout.rs:172:36
[INFO] [stdout]     |
[INFO] [stdout] 172 |                 let mut r = aux(es.tail().to_vec(), merge_extent(acc.clone(), move_extent(e.clone().to_vec(), x)));
[INFO] [stdout]     |                                    ^^^^ method not found in `Vec<Vec<(f64, f64)>>`
[INFO] [stdout]     |
[INFO] [stdout]     = help: items from traits can only be used if the trait is implemented and in scope
[INFO] [stdout] note: `Stack` defines an item `tail`, perhaps you need to implement it
[INFO] [stdout]    --> src/stack.rs:4:1
[INFO] [stdout]     |
[INFO] [stdout] 4   | pub trait Stack<T> {
[INFO] [stdout]     | ^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0599]: no method named `tail` found for struct `Vec<(f64, f64)>` in the current scope
[INFO] [stdout]    --> src/tree_layout.rs:199:61
[INFO] [stdout]     |
[INFO] [stdout] 199 |             let mut m = merge_extent(e1.tail().to_vec(), e2.tail().to_vec());
[INFO] [stdout]     |                                                             ^^^^ method not found in `Vec<(f64, f64)>`
[INFO] [stdout]     |
[INFO] [stdout]     = help: items from traits can only be used if the trait is implemented and in scope
[INFO] [stdout] note: `Stack` defines an item `tail`, perhaps you need to implement it
[INFO] [stdout]    --> src/stack.rs:4:1
[INFO] [stdout]     |
[INFO] [stdout] 4   | pub trait Stack<T> {
[INFO] [stdout]     | ^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0599]: no method named `tail` found for struct `Vec<(f64, f64)>` in the current scope
[INFO] [stdout]    --> src/tree_layout.rs:189:25
[INFO] [stdout]     |
[INFO] [stdout] 189 |             rmax(fit(e1.tail().to_vec(), e2.tail().to_vec()), p - q + 1.0),
[INFO] [stdout]     |                         ^^^^ method not found in `Vec<(f64, f64)>`
[INFO] [stdout]     |
[INFO] [stdout]     = help: items from traits can only be used if the trait is implemented and in scope
[INFO] [stdout] note: `Stack` defines an item `tail`, perhaps you need to implement it
[INFO] [stdout]    --> src/stack.rs:4:1
[INFO] [stdout]     |
[INFO] [stdout] 4   | pub trait Stack<T> {
[INFO] [stdout]     | ^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0599]: no method named `tail` found for struct `Vec<(f64, f64)>` in the current scope
[INFO] [stdout]    --> src/tree_layout.rs:189:45
[INFO] [stdout]     |
[INFO] [stdout] 189 |             rmax(fit(e1.tail().to_vec(), e2.tail().to_vec()), p - q + 1.0),
[INFO] [stdout]     |                                             ^^^^ method not found in `Vec<(f64, f64)>`
[INFO] [stdout]     |
[INFO] [stdout]     = help: items from traits can only be used if the trait is implemented and in scope
[INFO] [stdout] note: `Stack` defines an item `tail`, perhaps you need to implement it
[INFO] [stdout]    --> src/stack.rs:4:1
[INFO] [stdout]     |
[INFO] [stdout] 4   | pub trait Stack<T> {
[INFO] [stdout]     | ^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0599]: no method named `tail` found for struct `Vec<(f64, f64)>` in the current scope
[INFO] [stdout]    --> src/tree_layout.rs:199:41
[INFO] [stdout]     |
[INFO] [stdout] 199 |             let mut m = merge_extent(e1.tail().to_vec(), e2.tail().to_vec());
[INFO] [stdout]     |                                         ^^^^ method not found in `Vec<(f64, f64)>`
[INFO] [stdout]     |
[INFO] [stdout]     = help: items from traits can only be used if the trait is implemented and in scope
[INFO] [stdout] note: `Stack` defines an item `tail`, perhaps you need to implement it
[INFO] [stdout]    --> src/stack.rs:4:1
[INFO] [stdout]     |
[INFO] [stdout] 4   | pub trait Stack<T> {
[INFO] [stdout]     | ^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0599]: no method named `char_at` found for reference `&str` in the current scope
[INFO] [stdout]   --> src/trie.rs:59:40
[INFO] [stdout]    |
[INFO] [stdout] 59 |                     children.insert(k1.char_at(0), Rc::new(add_children(self, k1.to_string(), v)));
[INFO] [stdout]    |                                        ^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout] help: there is a method `chars` with a similar name, but with different arguments
[INFO] [stdout]   --> /rustc/f609b7e0586f81fefb3523e3e17adf779ac416be/library/core/src/str/mod.rs:835:5
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0599]: no method named `tail` found for struct `Vec<(f64, f64)>` in the current scope
[INFO] [stdout]    --> src/tree_layout.rs:199:61
[INFO] [stdout]     |
[INFO] [stdout] 199 |             let mut m = merge_extent(e1.tail().to_vec(), e2.tail().to_vec());
[INFO] [stdout]     |                                                             ^^^^ method not found in `Vec<(f64, f64)>`
[INFO] [stdout]     |
[INFO] [stdout]     = help: items from traits can only be used if the trait is implemented and in scope
[INFO] [stdout] note: `Stack` defines an item `tail`, perhaps you need to implement it
[INFO] [stdout]    --> src/stack.rs:4:1
[INFO] [stdout]     |
[INFO] [stdout] 4   | pub trait Stack<T> {
[INFO] [stdout]     | ^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0599]: no method named `char_at` found for reference `&str` in the current scope
[INFO] [stdout]   --> src/trie.rs:67:28
[INFO] [stdout]    |
[INFO] [stdout] 67 |                         k1.char_at(0) => Rc::new(Node { key: k1.to_string(), value: value.clone(), children: children.clone() })];
[INFO] [stdout]    |                            ^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout] help: there is a method `chars` with a similar name, but with different arguments
[INFO] [stdout]   --> /rustc/f609b7e0586f81fefb3523e3e17adf779ac416be/library/core/src/str/mod.rs:835:5
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0599]: no method named `char_at` found for reference `&str` in the current scope
[INFO] [stdout]   --> src/trie.rs:78:28
[INFO] [stdout]    |
[INFO] [stdout] 78 |                         k1.char_at(0) => Rc::new(Node { key: k1.to_string(), value: value.clone(), children: children.clone() }),
[INFO] [stdout]    |                            ^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout] help: there is a method `chars` with a similar name, but with different arguments
[INFO] [stdout]   --> /rustc/f609b7e0586f81fefb3523e3e17adf779ac416be/library/core/src/str/mod.rs:835:5
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0599]: no method named `char_at` found for reference `&str` in the current scope
[INFO] [stdout]   --> src/trie.rs:59:40
[INFO] [stdout]    |
[INFO] [stdout] 59 |                     children.insert(k1.char_at(0), Rc::new(add_children(self, k1.to_string(), v)));
[INFO] [stdout]    |                                        ^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout] help: there is a method `chars` with a similar name, but with different arguments
[INFO] [stdout]   --> /rustc/f609b7e0586f81fefb3523e3e17adf779ac416be/library/core/src/str/mod.rs:835:5
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0599]: no method named `char_at` found for reference `&str` in the current scope
[INFO] [stdout]   --> src/trie.rs:79:28
[INFO] [stdout]    |
[INFO] [stdout] 79 |                         k2.char_at(0) => Rc::new(Node { key: k2.to_string(), value: Some(v), children: hashmap![] })];
[INFO] [stdout]    |                            ^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout] help: there is a method `chars` with a similar name, but with different arguments
[INFO] [stdout]   --> /rustc/f609b7e0586f81fefb3523e3e17adf779ac416be/library/core/src/str/mod.rs:835:5
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0599]: no method named `char_at` found for reference `&str` in the current scope
[INFO] [stdout]   --> src/trie.rs:67:28
[INFO] [stdout]    |
[INFO] [stdout] 67 |                         k1.char_at(0) => Rc::new(Node { key: k1.to_string(), value: value.clone(), children: children.clone() })];
[INFO] [stdout]    |                            ^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout] help: there is a method `chars` with a similar name, but with different arguments
[INFO] [stdout]   --> /rustc/f609b7e0586f81fefb3523e3e17adf779ac416be/library/core/src/str/mod.rs:835:5
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0599]: no method named `char_at` found for struct `String` in the current scope
[INFO] [stdout]   --> src/trie.rs:38:43
[INFO] [stdout]    |
[INFO] [stdout] 38 |                     match children.get(&k.char_at(0)) {
[INFO] [stdout]    |                                           ^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout] help: there is a method `chars` with a similar name, but with different arguments
[INFO] [stdout]   --> /rustc/f609b7e0586f81fefb3523e3e17adf779ac416be/library/core/src/str/mod.rs:835:5
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0599]: no method named `char_at` found for reference `&str` in the current scope
[INFO] [stdout]   --> src/trie.rs:78:28
[INFO] [stdout]    |
[INFO] [stdout] 78 |                         k1.char_at(0) => Rc::new(Node { key: k1.to_string(), value: value.clone(), children: children.clone() }),
[INFO] [stdout]    |                            ^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout] help: there is a method `chars` with a similar name, but with different arguments
[INFO] [stdout]   --> /rustc/f609b7e0586f81fefb3523e3e17adf779ac416be/library/core/src/str/mod.rs:835:5
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0599]: no method named `char_at` found for struct `String` in the current scope
[INFO] [stdout]   --> src/trie.rs:97:43
[INFO] [stdout]    |
[INFO] [stdout] 97 |                     match children.get(&k.char_at(key.len())) {
[INFO] [stdout]    |                                           ^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout] help: there is a method `chars` with a similar name, but with different arguments
[INFO] [stdout]   --> /rustc/f609b7e0586f81fefb3523e3e17adf779ac416be/library/core/src/str/mod.rs:835:5
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0599]: no method named `char_at` found for reference `&str` in the current scope
[INFO] [stdout]   --> src/trie.rs:79:28
[INFO] [stdout]    |
[INFO] [stdout] 79 |                         k2.char_at(0) => Rc::new(Node { key: k2.to_string(), value: Some(v), children: hashmap![] })];
[INFO] [stdout]    |                            ^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout] help: there is a method `chars` with a similar name, but with different arguments
[INFO] [stdout]   --> /rustc/f609b7e0586f81fefb3523e3e17adf779ac416be/library/core/src/str/mod.rs:835:5
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0599]: no method named `char_at` found for struct `String` in the current scope
[INFO] [stdout]   --> src/trie.rs:38:43
[INFO] [stdout]    |
[INFO] [stdout] 38 |                     match children.get(&k.char_at(0)) {
[INFO] [stdout]    |                                           ^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout] help: there is a method `chars` with a similar name, but with different arguments
[INFO] [stdout]   --> /rustc/f609b7e0586f81fefb3523e3e17adf779ac416be/library/core/src/str/mod.rs:835:5
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]    --> src/heap.rs:120:14
[INFO] [stdout]     |
[INFO] [stdout] 120 |          let mut vec = ::std::collections::VecDeque::new();
[INFO] [stdout]     |              ----^^^
[INFO] [stdout]     |              |
[INFO] [stdout]     |              help: remove this `mut`
[INFO] [stdout] ...
[INFO] [stdout] 176 |             ((**h.front().unwrap()).clone(), vecdeque![])
[INFO] [stdout]     |                                              ----------- in this macro invocation
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unused_mut)]` on by default
[INFO] [stdout]     = note: this warning originates in the macro `vecdeque` (in Nightly builds, run with -Z macro-backtrace for more info)
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]    --> src/heap.rs:120:14
[INFO] [stdout]     |
[INFO] [stdout] 120 |          let mut vec = ::std::collections::VecDeque::new();
[INFO] [stdout]     |              ----^^^
[INFO] [stdout]     |              |
[INFO] [stdout]     |              help: remove this `mut`
[INFO] [stdout] ...
[INFO] [stdout] 196 |         vecdeque![]
[INFO] [stdout]     |         ----------- in this macro invocation
[INFO] [stdout]     |
[INFO] [stdout]     = note: this warning originates in the macro `vecdeque` (in Nightly builds, run with -Z macro-backtrace for more info)
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]    --> src/heap.rs:120:14
[INFO] [stdout]     |
[INFO] [stdout] 120 |          let mut vec = ::std::collections::VecDeque::new();
[INFO] [stdout]     |              ----^^^
[INFO] [stdout]     |              |
[INFO] [stdout]     |              help: remove this `mut`
[INFO] [stdout] ...
[INFO] [stdout] 228 |         insert_tree(self, &BinomialTree(0, x, vecdeque![]))
[INFO] [stdout]     |                                               ----------- in this macro invocation
[INFO] [stdout]     |
[INFO] [stdout]     = note: this warning originates in the macro `vecdeque` (in Nightly builds, run with -Z macro-backtrace for more info)
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0599]: no method named `char_at` found for struct `String` in the current scope
[INFO] [stdout]   --> src/trie.rs:97:43
[INFO] [stdout]    |
[INFO] [stdout] 97 |                     match children.get(&k.char_at(key.len())) {
[INFO] [stdout]    |                                           ^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout] help: there is a method `chars` with a similar name, but with different arguments
[INFO] [stdout]   --> /rustc/f609b7e0586f81fefb3523e3e17adf779ac416be/library/core/src/str/mod.rs:835:5
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]    --> src/heap.rs:120:14
[INFO] [stdout]     |
[INFO] [stdout] 120 |          let mut vec = ::std::collections::VecDeque::new();
[INFO] [stdout]     |              ----^^^
[INFO] [stdout]     |              |
[INFO] [stdout]     |              help: remove this `mut`
[INFO] [stdout] ...
[INFO] [stdout] 176 |             ((**h.front().unwrap()).clone(), vecdeque![])
[INFO] [stdout]     |                                              ----------- in this macro invocation
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unused_mut)]` on by default
[INFO] [stdout]     = note: this warning originates in the macro `vecdeque` (in Nightly builds, run with -Z macro-backtrace for more info)
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]    --> src/heap.rs:120:14
[INFO] [stdout]     |
[INFO] [stdout] 120 |          let mut vec = ::std::collections::VecDeque::new();
[INFO] [stdout]     |              ----^^^
[INFO] [stdout]     |              |
[INFO] [stdout]     |              help: remove this `mut`
[INFO] [stdout] ...
[INFO] [stdout] 196 |         vecdeque![]
[INFO] [stdout]     |         ----------- in this macro invocation
[INFO] [stdout]     |
[INFO] [stdout]     = note: this warning originates in the macro `vecdeque` (in Nightly builds, run with -Z macro-backtrace for more info)
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]    --> src/heap.rs:120:14
[INFO] [stdout]     |
[INFO] [stdout] 120 |          let mut vec = ::std::collections::VecDeque::new();
[INFO] [stdout]     |              ----^^^
[INFO] [stdout]     |              |
[INFO] [stdout]     |              help: remove this `mut`
[INFO] [stdout] ...
[INFO] [stdout] 228 |         insert_tree(self, &BinomialTree(0, x, vecdeque![]))
[INFO] [stdout]     |                                               ----------- in this macro invocation
[INFO] [stdout]     |
[INFO] [stdout]     = note: this warning originates in the macro `vecdeque` (in Nightly builds, run with -Z macro-backtrace for more info)
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: aborting due to 14 previous errors; 45 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] Some errors have detailed explanations: E0432, E0599.
[INFO] [stdout] 
[INFO] [stdout] For more information about an error, try `rustc --explain E0432`.
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `okasaki` (lib) due to 15 previous errors; 45 warnings emitted
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[INFO] [stdout] error: aborting due to 14 previous errors; 45 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] Some errors have detailed explanations: E0432, E0599.
[INFO] [stdout] 
[INFO] [stdout] For more information about an error, try `rustc --explain E0432`.
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `okasaki` (lib test) due to 15 previous errors; 45 warnings emitted
[INFO] running `Command { std: "docker" "inspect" "8fbb8d5580aa8fb5509e0f95d9ee3259dea3d32b0a8aa3a252a2673257899238", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "8fbb8d5580aa8fb5509e0f95d9ee3259dea3d32b0a8aa3a252a2673257899238", kill_on_drop: false }`
[INFO] [stdout] 8fbb8d5580aa8fb5509e0f95d9ee3259dea3d32b0a8aa3a252a2673257899238