[INFO] updating cached repository remexre/datalog
[INFO] running `"git" "fetch" "--all"`
[INFO] [stdout] Fetching origin
[INFO] [stderr] From git://github.com/remexre/datalog
[INFO] [stderr]  * branch            HEAD       -> FETCH_HEAD
[INFO] running `"git" "clone" "work/cache/sources/gh/remexre/datalog" "work/ex/pr-58948/sources/master#0f88167f89fffe321590c5148f21b7d51d44388d/gh/remexre/datalog"`
[INFO] [stderr] Cloning into 'work/ex/pr-58948/sources/master#0f88167f89fffe321590c5148f21b7d51d44388d/gh/remexre/datalog'...
[INFO] [stderr] done.
[INFO] running `"git" "clone" "work/cache/sources/gh/remexre/datalog" "work/ex/pr-58948/sources/try#a829e31f924ec11e400e8d0c2fd2c4bb8937ae6b/gh/remexre/datalog"`
[INFO] [stderr] Cloning into 'work/ex/pr-58948/sources/try#a829e31f924ec11e400e8d0c2fd2c4bb8937ae6b/gh/remexre/datalog'...
[INFO] [stderr] done.
[INFO] running `"git" "rev-parse" "HEAD"`
[INFO] [stdout] 58da741a50543d581c6f29a5a56dac7b90dec907
[INFO] sha for GitHub repo remexre/datalog: 58da741a50543d581c6f29a5a56dac7b90dec907
[INFO] validating manifest of remexre/datalog on toolchain master#0f88167f89fffe321590c5148f21b7d51d44388d
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+0f88167f89fffe321590c5148f21b7d51d44388d-alt" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] validating manifest of remexre/datalog on toolchain try#a829e31f924ec11e400e8d0c2fd2c4bb8937ae6b
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+a829e31f924ec11e400e8d0c2fd2c4bb8937ae6b-alt" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] started frobbing remexre/datalog
[INFO] finished frobbing remexre/datalog
[INFO] frobbed toml for remexre/datalog written to work/ex/pr-58948/sources/master#0f88167f89fffe321590c5148f21b7d51d44388d/gh/remexre/datalog/Cargo.toml
[INFO] started frobbing remexre/datalog
[INFO] finished frobbing remexre/datalog
[INFO] frobbed toml for remexre/datalog written to work/ex/pr-58948/sources/try#a829e31f924ec11e400e8d0c2fd2c4bb8937ae6b/gh/remexre/datalog/Cargo.toml
[INFO] crate remexre/datalog already has a lockfile, it will not be regenerated
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+0f88167f89fffe321590c5148f21b7d51d44388d-alt" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+a829e31f924ec11e400e8d0c2fd2c4bb8937ae6b-alt" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] checking remexre/datalog against try#a829e31f924ec11e400e8d0c2fd2c4bb8937ae6b for pr-58948
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/pr-58948/worker-6/try#a829e31f924ec11e400e8d0c2fd2c4bb8937ae6b:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/pr-58948/sources/try#a829e31f924ec11e400e8d0c2fd2c4bb8937ae6b/gh/remexre/datalog:/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" "+a829e31f924ec11e400e8d0c2fd2c4bb8937ae6b-alt" "check" "--frozen" "--all" "--all-targets"`
[INFO] [stdout] 1655b7cd89e79d60afc8f90b9aa4c1c0cf06712fbb230e74b2dbe6c038752b8c
[INFO] running `"docker" "start" "-a" "1655b7cd89e79d60afc8f90b9aa4c1c0cf06712fbb230e74b2dbe6c038752b8c"`
[INFO] [stderr]     Checking spin v0.4.6
[INFO] [stderr]    Compiling pest v1.0.2
[INFO] [stderr]     Checking try_opt v0.1.1
[INFO] [stderr]     Checking itertools v0.7.6
[INFO] [stderr]     Checking liner v0.4.4
[INFO] [stderr]     Checking proptest v0.4.2
[INFO] [stderr]     Checking regex v0.2.5
[INFO] [stderr]     Checking symbol v0.1.1
[INFO] [stderr]    Compiling pest_derive v1.0.2
[INFO] [stderr]     Checking sparkly v0.1.4
[INFO] [stderr]     Checking datalog v0.1.0 (/opt/crater/workdir)
[INFO] [stderr] warning: use of deprecated item 'std::error::Error::cause': replaced by Error::source, which can support downcasting
[INFO] [stderr]   --> src/errors.rs:9:1
[INFO] [stderr]    |
[INFO] [stderr] 9  | / error_chain! {
[INFO] [stderr] 10 | |     errors {
[INFO] [stderr] 11 | |         NoSuchClause(clause: Clause) {
[INFO] [stderr] 12 | |             description("A non-existent clause was found")
[INFO] [stderr] ...  |
[INFO] [stderr] 21 | |     }
[INFO] [stderr] 22 | | }
[INFO] [stderr]    | |_^
[INFO] [stderr]    |
[INFO] [stderr]    = note: #[warn(deprecated)] on by default
[INFO] [stderr]    = note: this error originates in a macro outside of the current crate (in Nightly builds, run with -Z external-macro-backtrace for more info)
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `body`
[INFO] [stderr]    --> src/ast/mod.rs:119:26
[INFO] [stderr]     |
[INFO] [stderr] 119 |         let Clause(head, body) = self.clone();
[INFO] [stderr]     |                          ^^^^ help: consider prefixing with an underscore: `_body`
[INFO] [stderr]     |
[INFO] [stderr]     = note: #[warn(unused_variables)] on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `name`
[INFO] [stderr]    --> src/ast/mod.rs:123:21
[INFO] [stderr]     |
[INFO] [stderr] 123 |         let Literal(name, mut hargs) = head;
[INFO] [stderr]     |                     ^^^^ help: consider prefixing with an underscore: `_name`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `other`
[INFO] [stderr]  --> src/ast/eq.rs:5:28
[INFO] [stderr]   |
[INFO] [stderr] 5 |     pub fn alpha_eq(&self, other: &Clause) -> bool {
[INFO] [stderr]   |                            ^^^^^ help: consider prefixing with an underscore: `_other`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `lv`
[INFO] [stderr]   --> src/ast/pattern_match.rs:32:24
[INFO] [stderr]    |
[INFO] [stderr] 32 |             (Term::Var(lv), Term::Var(rv)) => {}
[INFO] [stderr]    |                        ^^ help: consider prefixing with an underscore: `_lv`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `rv`
[INFO] [stderr]   --> src/ast/pattern_match.rs:32:39
[INFO] [stderr]    |
[INFO] [stderr] 32 |             (Term::Var(lv), Term::Var(rv)) => {}
[INFO] [stderr]    |                                       ^^ help: consider prefixing with an underscore: `_rv`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `clause`
[INFO] [stderr]    --> src/naive/mod.rs:103:34
[INFO] [stderr]     |
[INFO] [stderr] 103 |     fn run_retraction(&mut self, clause: Clause) -> Result<()> {
[INFO] [stderr]     |                                  ^^^^^^ help: consider prefixing with an underscore: `_clause`
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `entry_fn`
[INFO] [stderr]   --> src/util.rs:7:1
[INFO] [stderr]    |
[INFO] [stderr] 7  | / pub fn entry_fn<F, K, V>(map: &mut HashMap<K, V>, key: K, f: F)
[INFO] [stderr] 8  | | where
[INFO] [stderr] 9  | |     F: FnOnce(&K, Option<V>) -> Option<V>,
[INFO] [stderr] 10 | |     K: Eq + Hash,
[INFO] [stderr] ...  |
[INFO] [stderr] 15 | |     }
[INFO] [stderr] 16 | | }
[INFO] [stderr]    | |_^
[INFO] [stderr]    |
[INFO] [stderr]    = note: #[warn(dead_code)] on by default
[INFO] [stderr] 
[INFO] [stderr] warning: use of deprecated item 'std::error::Error::cause': replaced by Error::source, which can support downcasting
[INFO] [stderr]   --> src/errors.rs:9:1
[INFO] [stderr]    |
[INFO] [stderr] 9  | / error_chain! {
[INFO] [stderr] 10 | |     errors {
[INFO] [stderr] 11 | |         NoSuchClause(clause: Clause) {
[INFO] [stderr] 12 | |             description("A non-existent clause was found")
[INFO] [stderr] ...  |
[INFO] [stderr] 21 | |     }
[INFO] [stderr] 22 | | }
[INFO] [stderr]    | |_^
[INFO] [stderr]    |
[INFO] [stderr]    = note: #[warn(deprecated)] on by default
[INFO] [stderr]    = note: this error originates in a macro outside of the current crate (in Nightly builds, run with -Z external-macro-backtrace for more info)
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `body`
[INFO] [stderr]    --> src/ast/mod.rs:119:26
[INFO] [stderr]     |
[INFO] [stderr] 119 |         let Clause(head, body) = self.clone();
[INFO] [stderr]     |                          ^^^^ help: consider prefixing with an underscore: `_body`
[INFO] [stderr]     |
[INFO] [stderr]     = note: #[warn(unused_variables)] on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `name`
[INFO] [stderr]    --> src/ast/mod.rs:123:21
[INFO] [stderr]     |
[INFO] [stderr] 123 |         let Literal(name, mut hargs) = head;
[INFO] [stderr]     |                     ^^^^ help: consider prefixing with an underscore: `_name`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `other`
[INFO] [stderr]  --> src/ast/eq.rs:5:28
[INFO] [stderr]   |
[INFO] [stderr] 5 |     pub fn alpha_eq(&self, other: &Clause) -> bool {
[INFO] [stderr]   |                            ^^^^^ help: consider prefixing with an underscore: `_other`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `lv`
[INFO] [stderr]   --> src/ast/pattern_match.rs:32:24
[INFO] [stderr]    |
[INFO] [stderr] 32 |             (Term::Var(lv), Term::Var(rv)) => {}
[INFO] [stderr]    |                        ^^ help: consider prefixing with an underscore: `_lv`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `rv`
[INFO] [stderr]   --> src/ast/pattern_match.rs:32:39
[INFO] [stderr]    |
[INFO] [stderr] 32 |             (Term::Var(lv), Term::Var(rv)) => {}
[INFO] [stderr]    |                                       ^^ help: consider prefixing with an underscore: `_rv`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `clause`
[INFO] [stderr]    --> src/naive/mod.rs:103:34
[INFO] [stderr]     |
[INFO] [stderr] 103 |     fn run_retraction(&mut self, clause: Clause) -> Result<()> {
[INFO] [stderr]     |                                  ^^^^^^ help: consider prefixing with an underscore: `_clause`
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `entry_fn`
[INFO] [stderr]   --> src/util.rs:7:1
[INFO] [stderr]    |
[INFO] [stderr] 7  | / pub fn entry_fn<F, K, V>(map: &mut HashMap<K, V>, key: K, f: F)
[INFO] [stderr] 8  | | where
[INFO] [stderr] 9  | |     F: FnOnce(&K, Option<V>) -> Option<V>,
[INFO] [stderr] 10 | |     K: Eq + Hash,
[INFO] [stderr] ...  |
[INFO] [stderr] 15 | |     }
[INFO] [stderr] 16 | | }
[INFO] [stderr]    | |_^
[INFO] [stderr]    |
[INFO] [stderr]    = note: #[warn(dead_code)] on by default
[INFO] [stderr] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 24.92s
[INFO] running `"docker" "inspect" "1655b7cd89e79d60afc8f90b9aa4c1c0cf06712fbb230e74b2dbe6c038752b8c"`
[INFO] running `"docker" "rm" "-f" "1655b7cd89e79d60afc8f90b9aa4c1c0cf06712fbb230e74b2dbe6c038752b8c"`
[INFO] [stdout] 1655b7cd89e79d60afc8f90b9aa4c1c0cf06712fbb230e74b2dbe6c038752b8c