[INFO] updating cached repository andresilva/rust-okasaki
[INFO] running `"git" "fetch" "--all"`
[INFO] [stdout] Fetching origin
[INFO] [stderr] From git://github.com/andresilva/rust-okasaki
[INFO] [stderr]  * branch            HEAD       -> FETCH_HEAD
[INFO] running `"git" "clone" "work/cache/sources/gh/andresilva/rust-okasaki" "work/ex/pr-62849/sources/master#435236b8877cdb98c82eaebfb7887782277265c5/gh/andresilva/rust-okasaki"`
[INFO] [stderr] Cloning into 'work/ex/pr-62849/sources/master#435236b8877cdb98c82eaebfb7887782277265c5/gh/andresilva/rust-okasaki'...
[INFO] [stderr] done.
[INFO] running `"git" "clone" "work/cache/sources/gh/andresilva/rust-okasaki" "work/ex/pr-62849/sources/try#b5c7f157c20453dde8d47371abe73b32351b4e7f/gh/andresilva/rust-okasaki"`
[INFO] [stderr] Cloning into 'work/ex/pr-62849/sources/try#b5c7f157c20453dde8d47371abe73b32351b4e7f/gh/andresilva/rust-okasaki'...
[INFO] [stderr] done.
[INFO] running `"git" "rev-parse" "HEAD"`
[INFO] [stdout] da0f298d49be46ba9899f78944ec2b0fbbf64885
[INFO] sha for GitHub repo andresilva/rust-okasaki: da0f298d49be46ba9899f78944ec2b0fbbf64885
[INFO] validating manifest of andresilva/rust-okasaki on toolchain master#435236b8877cdb98c82eaebfb7887782277265c5
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+435236b8877cdb98c82eaebfb7887782277265c5-alt" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] validating manifest of andresilva/rust-okasaki on toolchain try#b5c7f157c20453dde8d47371abe73b32351b4e7f
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+b5c7f157c20453dde8d47371abe73b32351b4e7f-alt" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] started frobbing andresilva/rust-okasaki
[INFO] finished frobbing andresilva/rust-okasaki
[INFO] frobbed toml for andresilva/rust-okasaki written to work/ex/pr-62849/sources/master#435236b8877cdb98c82eaebfb7887782277265c5/gh/andresilva/rust-okasaki/Cargo.toml
[INFO] started frobbing andresilva/rust-okasaki
[INFO] finished frobbing andresilva/rust-okasaki
[INFO] frobbed toml for andresilva/rust-okasaki written to work/ex/pr-62849/sources/try#b5c7f157c20453dde8d47371abe73b32351b4e7f/gh/andresilva/rust-okasaki/Cargo.toml
[INFO] crate andresilva/rust-okasaki already has a lockfile, it will not be regenerated
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+435236b8877cdb98c82eaebfb7887782277265c5-alt" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+b5c7f157c20453dde8d47371abe73b32351b4e7f-alt" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] checking andresilva/rust-okasaki against try#b5c7f157c20453dde8d47371abe73b32351b4e7f for pr-62849
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/pr-62849/worker-0/try#b5c7f157c20453dde8d47371abe73b32351b4e7f:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/pr-62849/sources/try#b5c7f157c20453dde8d47371abe73b32351b4e7f/gh/andresilva/rust-okasaki:/opt/crater/workdir:ro,Z" "-v" "/mnt/big/crater/work/local/cargo-home:/opt/crater/cargo-home:ro,Z" "-v" "/mnt/big/crater/work/local/rustup-home:/opt/crater/rustup-home:ro,Z" "-e" "USER_ID=1000" "-e" "SOURCE_DIR=/opt/crater/workdir" "-e" "MAP_USER_ID=1000" "-e" "CARGO_TARGET_DIR=/opt/crater/target" "-e" "CARGO_INCREMENTAL=0" "-e" "RUST_BACKTRACE=full" "-e" "RUSTFLAGS=--cap-lints=forbid" "-e" "CARGO_HOME=/opt/crater/cargo-home" "-e" "RUSTUP_HOME=/opt/crater/rustup-home" "-w" "/opt/crater/workdir" "-m" "1536M" "--network" "none" "rustops/crates-build-env" "/opt/crater/cargo-home/bin/cargo" "+b5c7f157c20453dde8d47371abe73b32351b4e7f-alt" "check" "--frozen" "--all" "--all-targets"`
[INFO] [stdout] 1d9d39326a73693eb7712eea3d2ed03f250b7e562ee4cc26f030bffaa3165684
[INFO] running `"docker" "start" "-a" "1d9d39326a73693eb7712eea3d2ed03f250b7e562ee4cc26f030bffaa3165684"`
[INFO] [stderr]     Checking okasaki v0.0.1 (/opt/crater/workdir)
[INFO] [stderr] error[E0432]: unresolved import `std::num::Int`
[INFO] [stderr]  --> src/tree.rs:3:5
[INFO] [stderr]   |
[INFO] [stderr] 3 | use std::num::Int;
[INFO] [stderr]   |     ^^^^^^^^^^^^^ no `Int` in `num`
[INFO] [stderr] 
[INFO] [stderr] error[E0432]: unresolved import `std::num::Float`
[INFO] [stderr]  --> src/tree_layout.rs:2:5
[INFO] [stderr]   |
[INFO] [stderr] 2 | use std::num::Float;
[INFO] [stderr]   |     ^^^^^^^^^^^^^^^ no `Float` in `num`
[INFO] [stderr] 
[INFO] [stderr] warning: unnecessary parentheses around `if` condition
[INFO] [stderr]    --> src/heap.rs:184:16
[INFO] [stderr]     |
[INFO] [stderr] 184 |             if (root(t) < root(&t1)) {
[INFO] [stderr]     |                ^^^^^^^^^^^^^^^^^^^^^ help: remove these parentheses
[INFO] [stderr]     |
[INFO] [stderr]     = note: `#[warn(unused_parens)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `std::cmp::max`
[INFO] [stderr]  --> src/tree.rs:1:5
[INFO] [stderr]   |
[INFO] [stderr] 1 | use std::cmp::max;
[INFO] [stderr]   |     ^^^^^^^^^^^^^
[INFO] [stderr]   |
[INFO] [stderr]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unnecessary parentheses around `for` head expression
[INFO] [stderr]   --> src/tree_layout.rs:14:18
[INFO] [stderr]    |
[INFO] [stderr] 14 |         for _ in (0..n) {
[INFO] [stderr]    |                  ^^^^^^ help: remove these parentheses
[INFO] [stderr] 
[INFO] [stderr] error[E0432]: unresolved import `std::num::Int`
[INFO] [stderr]  --> src/tree.rs:3:5
[INFO] [stderr]   |
[INFO] [stderr] 3 | use std::num::Int;
[INFO] [stderr]   |     ^^^^^^^^^^^^^ no `Int` in `num`
[INFO] [stderr] 
[INFO] [stderr] error[E0432]: unresolved import `std::num::Float`
[INFO] [stderr]  --> src/tree_layout.rs:2:5
[INFO] [stderr]   |
[INFO] [stderr] 2 | use std::num::Float;
[INFO] [stderr]   |     ^^^^^^^^^^^^^^^ no `Float` in `num`
[INFO] [stderr] 
[INFO] [stderr] warning: unnecessary parentheses around `if` condition
[INFO] [stderr]    --> src/heap.rs:184:16
[INFO] [stderr]     |
[INFO] [stderr] 184 |             if (root(t) < root(&t1)) {
[INFO] [stderr]     |                ^^^^^^^^^^^^^^^^^^^^^ help: remove these parentheses
[INFO] [stderr]     |
[INFO] [stderr]     = note: `#[warn(unused_parens)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `std::cmp::max`
[INFO] [stderr]  --> src/tree.rs:1:5
[INFO] [stderr]   |
[INFO] [stderr] 1 | use std::cmp::max;
[INFO] [stderr]   |     ^^^^^^^^^^^^^
[INFO] [stderr]   |
[INFO] [stderr]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unnecessary parentheses around `for` head expression
[INFO] [stderr]   --> src/tree_layout.rs:14:18
[INFO] [stderr]    |
[INFO] [stderr] 14 |         for _ in (0..n) {
[INFO] [stderr]    |                  ^^^^^^ help: remove these parentheses
[INFO] [stderr] 
[INFO] [stderr] error[E0599]: no method named `tail` found for type `std::vec::Vec<tree::Tree<(T, f64)>>` in the current scope
[INFO] [stderr]   --> src/tree_layout.rs:45:29
[INFO] [stderr]    |
[INFO] [stderr] 45 |                 aux(current.tail().to_vec(), next, o);
[INFO] [stderr]    |                             ^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = help: items from traits can only be used if the trait is implemented and in scope
[INFO] [stderr]    = note: the following trait defines an item `tail`, perhaps you need to implement it:
[INFO] [stderr]            candidate #1: `stack::Stack`
[INFO] [stderr] 
[INFO] [stderr] error[E0599]: no method named `tail` found for type `std::vec::Vec<std::vec::Vec<(f64, f64)>>` in the current scope
[INFO] [stderr]    --> src/tree_layout.rs:172:36
[INFO] [stderr]     |
[INFO] [stderr] 172 |                 let mut r = aux(es.tail().to_vec(), merge_extent(acc.clone(), move_extent(e.clone().to_vec(), x)));
[INFO] [stderr]     |                                    ^^^^
[INFO] [stderr]     |
[INFO] [stderr]     = help: items from traits can only be used if the trait is implemented and in scope
[INFO] [stderr]     = note: the following trait defines an item `tail`, perhaps you need to implement it:
[INFO] [stderr]             candidate #1: `stack::Stack`
[INFO] [stderr] 
[INFO] [stderr] error[E0599]: no method named `tail` found for type `std::vec::Vec<(f64, f64)>` in the current scope
[INFO] [stderr]    --> src/tree_layout.rs:189:25
[INFO] [stderr]     |
[INFO] [stderr] 189 |             rmax(fit(e1.tail().to_vec(), e2.tail().to_vec()), p - q + 1.0),
[INFO] [stderr]     |                         ^^^^
[INFO] [stderr]     |
[INFO] [stderr]     = help: items from traits can only be used if the trait is implemented and in scope
[INFO] [stderr]     = note: the following trait defines an item `tail`, perhaps you need to implement it:
[INFO] [stderr]             candidate #1: `stack::Stack`
[INFO] [stderr] 
[INFO] [stderr] error[E0599]: no method named `tail` found for type `std::vec::Vec<(f64, f64)>` in the current scope
[INFO] [stderr]    --> src/tree_layout.rs:189:45
[INFO] [stderr]     |
[INFO] [stderr] 189 |             rmax(fit(e1.tail().to_vec(), e2.tail().to_vec()), p - q + 1.0),
[INFO] [stderr]     |                                             ^^^^
[INFO] [stderr]     |
[INFO] [stderr]     = help: items from traits can only be used if the trait is implemented and in scope
[INFO] [stderr]     = note: the following trait defines an item `tail`, perhaps you need to implement it:
[INFO] [stderr]             candidate #1: `stack::Stack`
[INFO] [stderr] 
[INFO] [stderr] error[E0599]: no method named `tail` found for type `std::vec::Vec<(f64, f64)>` in the current scope
[INFO] [stderr]    --> src/tree_layout.rs:199:41
[INFO] [stderr]     |
[INFO] [stderr] 199 |             let mut m = merge_extent(e1.tail().to_vec(), e2.tail().to_vec());
[INFO] [stderr]     |                                         ^^^^
[INFO] [stderr]     |
[INFO] [stderr]     = help: items from traits can only be used if the trait is implemented and in scope
[INFO] [stderr]     = note: the following trait defines an item `tail`, perhaps you need to implement it:
[INFO] [stderr]             candidate #1: `stack::Stack`
[INFO] [stderr] 
[INFO] [stderr] error[E0599]: no method named `tail` found for type `std::vec::Vec<(f64, f64)>` in the current scope
[INFO] [stderr]    --> src/tree_layout.rs:199:61
[INFO] [stderr]     |
[INFO] [stderr] 199 |             let mut m = merge_extent(e1.tail().to_vec(), e2.tail().to_vec());
[INFO] [stderr]     |                                                             ^^^^
[INFO] [stderr]     |
[INFO] [stderr]     = help: items from traits can only be used if the trait is implemented and in scope
[INFO] [stderr]     = note: the following trait defines an item `tail`, perhaps you need to implement it:
[INFO] [stderr]             candidate #1: `stack::Stack`
[INFO] [stderr] 
[INFO] [stderr] error[E0599]: no method named `char_at` found for type `&str` in the current scope
[INFO] [stderr]   --> src/trie.rs:59:40
[INFO] [stderr]    |
[INFO] [stderr] 59 |                     children.insert(k1.char_at(0), Rc::new(add_children(self, k1.to_string(), v)));
[INFO] [stderr]    |                                        ^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] error[E0599]: no method named `char_at` found for type `&str` in the current scope
[INFO] [stderr]   --> src/trie.rs:67:28
[INFO] [stderr]    |
[INFO] [stderr] 67 |                         k1.char_at(0) => Rc::new(Node { key: k1.to_string(), value: value.clone(), children: children.clone() })];
[INFO] [stderr]    |                            ^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] error[E0599]: no method named `char_at` found for type `&str` in the current scope
[INFO] [stderr]   --> src/trie.rs:78:28
[INFO] [stderr]    |
[INFO] [stderr] 78 |                         k1.char_at(0) => Rc::new(Node { key: k1.to_string(), value: value.clone(), children: children.clone() }),
[INFO] [stderr]    |                            ^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] error[E0599]: no method named `char_at` found for type `&str` in the current scope
[INFO] [stderr]   --> src/trie.rs:79:28
[INFO] [stderr]    |
[INFO] [stderr] 79 |                         k2.char_at(0) => Rc::new(Node { key: k2.to_string(), value: Some(v), children: hashmap![] })];
[INFO] [stderr]    |                            ^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] error[E0599]: no method named `char_at` found for type `std::string::String` in the current scope
[INFO] [stderr]   --> src/trie.rs:38:43
[INFO] [stderr]    |
[INFO] [stderr] 38 |                     match children.get(&k.char_at(0)) {
[INFO] [stderr]    |                                           ^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] error[E0599]: no method named `char_at` found for type `std::string::String` in the current scope
[INFO] [stderr]   --> src/trie.rs:97:43
[INFO] [stderr]    |
[INFO] [stderr] 97 |                     match children.get(&k.char_at(key.len())) {
[INFO] [stderr]    |                                           ^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] error: aborting due to 14 previous errors
[INFO] [stderr] 
[INFO] [stderr] Some errors have detailed explanations: E0432, E0599.
[INFO] [stderr] For more information about an error, try `rustc --explain E0432`.
[INFO] [stderr] error[E0599]: no method named `tail` found for type `std::vec::Vec<tree::Tree<(T, f64)>>` in the current scope
[INFO] [stderr]   --> src/tree_layout.rs:45:29
[INFO] [stderr]    |
[INFO] [stderr] 45 |                 aux(current.tail().to_vec(), next, o);
[INFO] [stderr]    |                             ^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = help: items from traits can only be used if the trait is implemented and in scope
[INFO] [stderr]    = note: the following trait defines an item `tail`, perhaps you need to implement it:
[INFO] [stderr]            candidate #1: `stack::Stack`
[INFO] [stderr] 
[INFO] [stderr] error: Could not compile `okasaki`.
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[INFO] [stderr] error[E0599]: no method named `tail` found for type `std::vec::Vec<std::vec::Vec<(f64, f64)>>` in the current scope
[INFO] [stderr]    --> src/tree_layout.rs:172:36
[INFO] [stderr]     |
[INFO] [stderr] 172 |                 let mut r = aux(es.tail().to_vec(), merge_extent(acc.clone(), move_extent(e.clone().to_vec(), x)));
[INFO] [stderr]     |                                    ^^^^
[INFO] [stderr]     |
[INFO] [stderr]     = help: items from traits can only be used if the trait is implemented and in scope
[INFO] [stderr]     = note: the following trait defines an item `tail`, perhaps you need to implement it:
[INFO] [stderr]             candidate #1: `stack::Stack`
[INFO] [stderr] 
[INFO] [stderr] error[E0599]: no method named `tail` found for type `std::vec::Vec<(f64, f64)>` in the current scope
[INFO] [stderr]    --> src/tree_layout.rs:189:25
[INFO] [stderr]     |
[INFO] [stderr] 189 |             rmax(fit(e1.tail().to_vec(), e2.tail().to_vec()), p - q + 1.0),
[INFO] [stderr]     |                         ^^^^
[INFO] [stderr]     |
[INFO] [stderr]     = help: items from traits can only be used if the trait is implemented and in scope
[INFO] [stderr]     = note: the following trait defines an item `tail`, perhaps you need to implement it:
[INFO] [stderr]             candidate #1: `stack::Stack`
[INFO] [stderr] 
[INFO] [stderr] error[E0599]: no method named `tail` found for type `std::vec::Vec<(f64, f64)>` in the current scope
[INFO] [stderr]    --> src/tree_layout.rs:189:45
[INFO] [stderr]     |
[INFO] [stderr] 189 |             rmax(fit(e1.tail().to_vec(), e2.tail().to_vec()), p - q + 1.0),
[INFO] [stderr]     |                                             ^^^^
[INFO] [stderr]     |
[INFO] [stderr]     = help: items from traits can only be used if the trait is implemented and in scope
[INFO] [stderr]     = note: the following trait defines an item `tail`, perhaps you need to implement it:
[INFO] [stderr]             candidate #1: `stack::Stack`
[INFO] [stderr] 
[INFO] [stderr] error[E0599]: no method named `tail` found for type `std::vec::Vec<(f64, f64)>` in the current scope
[INFO] [stderr]    --> src/tree_layout.rs:199:41
[INFO] [stderr]     |
[INFO] [stderr] 199 |             let mut m = merge_extent(e1.tail().to_vec(), e2.tail().to_vec());
[INFO] [stderr]     |                                         ^^^^
[INFO] [stderr]     |
[INFO] [stderr]     = help: items from traits can only be used if the trait is implemented and in scope
[INFO] [stderr]     = note: the following trait defines an item `tail`, perhaps you need to implement it:
[INFO] [stderr]             candidate #1: `stack::Stack`
[INFO] [stderr] 
[INFO] [stderr] error[E0599]: no method named `tail` found for type `std::vec::Vec<(f64, f64)>` in the current scope
[INFO] [stderr]    --> src/tree_layout.rs:199:61
[INFO] [stderr]     |
[INFO] [stderr] 199 |             let mut m = merge_extent(e1.tail().to_vec(), e2.tail().to_vec());
[INFO] [stderr]     |                                                             ^^^^
[INFO] [stderr]     |
[INFO] [stderr]     = help: items from traits can only be used if the trait is implemented and in scope
[INFO] [stderr]     = note: the following trait defines an item `tail`, perhaps you need to implement it:
[INFO] [stderr]             candidate #1: `stack::Stack`
[INFO] [stderr] 
[INFO] [stderr] error[E0599]: no method named `char_at` found for type `&str` in the current scope
[INFO] [stderr]   --> src/trie.rs:59:40
[INFO] [stderr]    |
[INFO] [stderr] 59 |                     children.insert(k1.char_at(0), Rc::new(add_children(self, k1.to_string(), v)));
[INFO] [stderr]    |                                        ^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] error[E0599]: no method named `char_at` found for type `&str` in the current scope
[INFO] [stderr]   --> src/trie.rs:67:28
[INFO] [stderr]    |
[INFO] [stderr] 67 |                         k1.char_at(0) => Rc::new(Node { key: k1.to_string(), value: value.clone(), children: children.clone() })];
[INFO] [stderr]    |                            ^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] error[E0599]: no method named `char_at` found for type `&str` in the current scope
[INFO] [stderr]   --> src/trie.rs:78:28
[INFO] [stderr]    |
[INFO] [stderr] 78 |                         k1.char_at(0) => Rc::new(Node { key: k1.to_string(), value: value.clone(), children: children.clone() }),
[INFO] [stderr]    |                            ^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] error[E0599]: no method named `char_at` found for type `&str` in the current scope
[INFO] [stderr]   --> src/trie.rs:79:28
[INFO] [stderr]    |
[INFO] [stderr] 79 |                         k2.char_at(0) => Rc::new(Node { key: k2.to_string(), value: Some(v), children: hashmap![] })];
[INFO] [stderr]    |                            ^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] error[E0599]: no method named `char_at` found for type `std::string::String` in the current scope
[INFO] [stderr]   --> src/trie.rs:38:43
[INFO] [stderr]    |
[INFO] [stderr] 38 |                     match children.get(&k.char_at(0)) {
[INFO] [stderr]    |                                           ^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] error[E0599]: no method named `char_at` found for type `std::string::String` in the current scope
[INFO] [stderr]   --> src/trie.rs:97:43
[INFO] [stderr]    |
[INFO] [stderr] 97 |                     match children.get(&k.char_at(key.len())) {
[INFO] [stderr]    |                                           ^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] error: aborting due to 14 previous errors
[INFO] [stderr] 
[INFO] [stderr] Some errors have detailed explanations: E0432, E0599.
[INFO] [stderr] For more information about an error, try `rustc --explain E0432`.
[INFO] [stderr] error: Could not compile `okasaki`.
[INFO] [stderr] 
[INFO] [stderr] To learn more, run the command again with --verbose.
[INFO] running `"docker" "inspect" "1d9d39326a73693eb7712eea3d2ed03f250b7e562ee4cc26f030bffaa3165684"`
[INFO] running `"docker" "rm" "-f" "1d9d39326a73693eb7712eea3d2ed03f250b7e562ee4cc26f030bffaa3165684"`
[INFO] [stdout] 1d9d39326a73693eb7712eea3d2ed03f250b7e562ee4cc26f030bffaa3165684