[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 against master#a609fb45efad59dfd459c76e50899be9f0583b5a for pr-80579
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fandresilva%2Frust-okasaki" "/workspace/builds/worker-9/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-9/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/andresilva/rust-okasaki on toolchain a609fb45efad59dfd459c76e50899be9f0583b5a
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+a609fb45efad59dfd459c76e50899be9f0583b5a" "read-manifest" "--manifest-path" "Cargo.toml", 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-9/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: "/workspace/cargo-home/bin/cargo" "+a609fb45efad59dfd459c76e50899be9f0583b5a" "fetch" "--locked" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-9/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-9/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" "rustops/crates-build-env@sha256:b8eeb62f26c39b23691079a6cb6de528d8e88b4d71a8f6b1d30f8ba7d9c16de9" "/opt/rustwide/cargo-home/bin/cargo" "+a609fb45efad59dfd459c76e50899be9f0583b5a" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] b3b5420fe925bde3df222501afa091f30c2b16d1c27717cf5ff803a5685a43a0
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] running `Command { std: "docker" "start" "-a" "b3b5420fe925bde3df222501afa091f30c2b16d1c27717cf5ff803a5685a43a0", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "b3b5420fe925bde3df222501afa091f30c2b16d1c27717cf5ff803a5685a43a0", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "b3b5420fe925bde3df222501afa091f30c2b16d1c27717cf5ff803a5685a43a0", kill_on_drop: false }`
[INFO] [stdout] b3b5420fe925bde3df222501afa091f30c2b16d1c27717cf5ff803a5685a43a0
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-9/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-9/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" "CARGO_HOME=/opt/rustwide/cargo-home" "-e" "RUSTUP_HOME=/opt/rustwide/rustup-home" "-w" "/opt/rustwide/workdir" "-m" "1610612736" "--user" "0:0" "--network" "none" "rustops/crates-build-env@sha256:b8eeb62f26c39b23691079a6cb6de528d8e88b4d71a8f6b1d30f8ba7d9c16de9" "/opt/rustwide/cargo-home/bin/cargo" "+a609fb45efad59dfd459c76e50899be9f0583b5a" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 9f9768075b479c57a6a7063ca4d7af8012442160a324bcf3a8f6ca180ce5cc05
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] running `Command { std: "docker" "start" "-a" "9f9768075b479c57a6a7063ca4d7af8012442160a324bcf3a8f6ca180ce5cc05", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]     Blocking waiting for file lock on package cache
[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: 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]     = 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:110:17
[INFO] [stdout]     |
[INFO] [stdout] 110 |                 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:87:21
[INFO] [stdout]    |
[INFO] [stdout] 87 |                     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/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: unnecessary parentheses around `if` condition
[INFO] [stdout]    --> src/heap.rs:184:16
[INFO] [stdout]     |
[INFO] [stdout] 184 |             if (root(t) < root(&t1)) {
[INFO] [stdout]     |                ^^^^^^^^^^^^^^^^^^^^^ help: remove these parentheses
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unused_parens)]` on by default
[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: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: 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: 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]    |                  ^^^^^^ help: remove these parentheses
[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: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: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: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: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: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: 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]     = 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:110:17
[INFO] [stdout]     |
[INFO] [stdout] 110 |                 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:87:21
[INFO] [stdout]    |
[INFO] [stdout] 87 |                     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/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: unnecessary parentheses around `if` condition
[INFO] [stdout]    --> src/heap.rs:184:16
[INFO] [stdout]     |
[INFO] [stdout] 184 |             if (root(t) < root(&t1)) {
[INFO] [stdout]     |                ^^^^^^^^^^^^^^^^^^^^^ help: remove these parentheses
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unused_parens)]` on by default
[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: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: 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: 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]    |                  ^^^^^^ help: remove these parentheses
[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: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: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: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: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: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<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<(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<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 `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]    |                                        ^^^^^^^ method not found in `&str`
[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]    |                            ^^^^^^^ method not found in `&str`
[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]    |                            ^^^^^^^ method not found in `&str`
[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]    |                            ^^^^^^^ method not found in `&str`
[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]    |                                           ^^^^^^^ method not found in `String`
[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]    |                                           ^^^^^^^ method not found in `String`
[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: aborting due to 14 previous errors; 34 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] [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<(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:59:40
[INFO] [stdout]    |
[INFO] [stdout] 59 |                     children.insert(k1.char_at(0), Rc::new(add_children(self, k1.to_string(), v)));
[INFO] [stdout]    |                                        ^^^^^^^ method not found in `&str`
[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]    |                            ^^^^^^^ method not found in `&str`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `okasaki`
[INFO] [stderr] 
[INFO] [stderr] To learn more, run the command again with --verbose.
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[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]    |                            ^^^^^^^ method not found in `&str`
[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]    |                            ^^^^^^^ method not found in `&str`
[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]    |                                           ^^^^^^^ method not found in `String`
[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]    |                                           ^^^^^^^ method not found in `String`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: aborting due to 14 previous errors; 34 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: build failed
[INFO] running `Command { std: "docker" "inspect" "9f9768075b479c57a6a7063ca4d7af8012442160a324bcf3a8f6ca180ce5cc05", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "9f9768075b479c57a6a7063ca4d7af8012442160a324bcf3a8f6ca180ce5cc05", kill_on_drop: false }`
[INFO] [stdout] 9f9768075b479c57a6a7063ca4d7af8012442160a324bcf3a8f6ca180ce5cc05