[INFO] fetching crate lpsettings 0.2.3...
[INFO] testing lpsettings-0.2.3 against 1.59.0 for beta-1.60-1
[INFO] extracting crate lpsettings 0.2.3 into /workspace/builds/worker-4/source
[INFO] validating manifest of crates.io crate lpsettings 0.2.3 on toolchain 1.59.0
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.59.0" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking crates.io crate lpsettings 0.2.3
[INFO] finished tweaking crates.io crate lpsettings 0.2.3
[INFO] tweaked toml for crates.io crate lpsettings 0.2.3 written to /workspace/builds/worker-4/source/Cargo.toml
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.59.0" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update", kill_on_drop: false }`
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.59.0" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-4/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-4/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@sha256:0cd99ca24d8e8c98e67c542213511d985b8778b5bdcbb160e038429496686047" "/opt/rustwide/cargo-home/bin/cargo" "+1.59.0" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 44d12b577a30079378a5a869ef02269ad742a7834778dc0c85acf7d6c89872e7
[INFO] running `Command { std: "docker" "start" "-a" "44d12b577a30079378a5a869ef02269ad742a7834778dc0c85acf7d6c89872e7", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "44d12b577a30079378a5a869ef02269ad742a7834778dc0c85acf7d6c89872e7", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "44d12b577a30079378a5a869ef02269ad742a7834778dc0c85acf7d6c89872e7", kill_on_drop: false }`
[INFO] [stdout] 44d12b577a30079378a5a869ef02269ad742a7834778dc0c85acf7d6c89872e7
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-4/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-4/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=warn" "-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@sha256:0cd99ca24d8e8c98e67c542213511d985b8778b5bdcbb160e038429496686047" "/opt/rustwide/cargo-home/bin/cargo" "+1.59.0" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 3c0b7a2e64c3dfaa71a58546b604a62652fe8bb3a67b50983c2f7aaad22b468e
[INFO] running `Command { std: "docker" "start" "-a" "3c0b7a2e64c3dfaa71a58546b604a62652fe8bb3a67b50983c2f7aaad22b468e", kill_on_drop: false }`
[INFO] [stderr]    Compiling memchr v2.4.1
[INFO] [stderr]    Compiling serde v1.0.136
[INFO] [stderr]    Compiling serde_test v1.0.136
[INFO] [stderr]    Compiling regex-syntax v0.6.25
[INFO] [stderr]    Compiling num-traits v0.2.14
[INFO] [stderr]    Compiling num-integer v0.1.44
[INFO] [stderr]    Compiling time v0.1.44
[INFO] [stderr]    Compiling dirs v1.0.5
[INFO] [stderr]    Compiling object v0.27.1
[INFO] [stderr]    Compiling aho-corasick v0.7.18
[INFO] [stderr]    Compiling chrono v0.4.19
[INFO] [stderr]    Compiling regex v1.5.4
[INFO] [stderr]    Compiling toml v0.4.10
[INFO] [stderr]    Compiling backtrace v0.3.64
[INFO] [stderr]    Compiling version-lp v0.2.1
[INFO] [stderr]    Compiling failure v0.1.8
[INFO] [stderr]    Compiling settingsfile v0.2.8
[INFO] [stderr]    Compiling lpsettings v0.2.3 (/opt/rustwide/workdir)
[INFO] [stdout] warning: variant is never constructed: `Best`
[INFO] [stdout]  --> src/location.rs:9:5
[INFO] [stdout]   |
[INFO] [stdout] 9 |     Best,
[INFO] [stdout]   |     ^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variant is never constructed: `Local`
[INFO] [stdout]   --> src/location.rs:11:5
[INFO] [stdout]    |
[INFO] [stdout] 11 |     Local,
[INFO] [stdout]    |     ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variant is never constructed: `Global`
[INFO] [stdout]   --> src/location.rs:13:5
[INFO] [stdout]    |
[INFO] [stdout] 13 |     Global
[INFO] [stdout]    |     ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `get_location`
[INFO] [stdout]   --> src/location.rs:17:12
[INFO] [stdout]    |
[INFO] [stdout] 17 |     pub fn get_location() -> Location {
[INFO] [stdout]    |            ^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `to_string_cap`
[INFO] [stdout]   --> src/location.rs:27:12
[INFO] [stdout]    |
[INFO] [stdout] 27 |     pub fn to_string_cap(&self) -> String {
[INFO] [stdout]    |            ^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `key_value_set`
[INFO] [stdout]   --> src/theme.rs:19:8
[INFO] [stdout]    |
[INFO] [stdout] 19 | pub fn key_value_set<T: AsRef<str>>(text : T) -> String {
[INFO] [stdout]    |        ^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `error`
[INFO] [stdout]   --> src/theme.rs:23:8
[INFO] [stdout]    |
[INFO] [stdout] 23 | pub fn error<T: AsRef<str>>(text : T) -> String {
[INFO] [stdout]    |        ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `error_message`
[INFO] [stdout]   --> src/theme.rs:26:8
[INFO] [stdout]    |
[INFO] [stdout] 26 | pub fn error_message<T: AsRef<str>>(text : T) -> String {
[INFO] [stdout]    |        ^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 8 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 8.55s
[INFO] running `Command { std: "docker" "inspect" "3c0b7a2e64c3dfaa71a58546b604a62652fe8bb3a67b50983c2f7aaad22b468e", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "3c0b7a2e64c3dfaa71a58546b604a62652fe8bb3a67b50983c2f7aaad22b468e", kill_on_drop: false }`
[INFO] [stdout] 3c0b7a2e64c3dfaa71a58546b604a62652fe8bb3a67b50983c2f7aaad22b468e
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-4/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-4/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=warn" "-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@sha256:0cd99ca24d8e8c98e67c542213511d985b8778b5bdcbb160e038429496686047" "/opt/rustwide/cargo-home/bin/cargo" "+1.59.0" "test" "--frozen" "--no-run" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 5f6a86387f5fe50cc0efc3667d969e7b541dfd263cfe12770bb4ecf159f282af
[INFO] running `Command { std: "docker" "start" "-a" "5f6a86387f5fe50cc0efc3667d969e7b541dfd263cfe12770bb4ecf159f282af", kill_on_drop: false }`
[INFO] [stderr]    Compiling lpsettings v0.2.3 (/opt/rustwide/workdir)
[INFO] [stdout] warning: variant is never constructed: `Best`
[INFO] [stdout]  --> src/location.rs:9:5
[INFO] [stdout]   |
[INFO] [stdout] 9 |     Best,
[INFO] [stdout]   |     ^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variant is never constructed: `Local`
[INFO] [stdout]   --> src/location.rs:11:5
[INFO] [stdout]    |
[INFO] [stdout] 11 |     Local,
[INFO] [stdout]    |     ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variant is never constructed: `Global`
[INFO] [stdout]   --> src/location.rs:13:5
[INFO] [stdout]    |
[INFO] [stdout] 13 |     Global
[INFO] [stdout]    |     ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `get_location`
[INFO] [stdout]   --> src/location.rs:17:12
[INFO] [stdout]    |
[INFO] [stdout] 17 |     pub fn get_location() -> Location {
[INFO] [stdout]    |            ^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `to_string_cap`
[INFO] [stdout]   --> src/location.rs:27:12
[INFO] [stdout]    |
[INFO] [stdout] 27 |     pub fn to_string_cap(&self) -> String {
[INFO] [stdout]    |            ^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `key_value_set`
[INFO] [stdout]   --> src/theme.rs:19:8
[INFO] [stdout]    |
[INFO] [stdout] 19 | pub fn key_value_set<T: AsRef<str>>(text : T) -> String {
[INFO] [stdout]    |        ^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `error`
[INFO] [stdout]   --> src/theme.rs:23:8
[INFO] [stdout]    |
[INFO] [stdout] 23 | pub fn error<T: AsRef<str>>(text : T) -> String {
[INFO] [stdout]    |        ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `error_message`
[INFO] [stdout]   --> src/theme.rs:26:8
[INFO] [stdout]    |
[INFO] [stdout] 26 | pub fn error_message<T: AsRef<str>>(text : T) -> String {
[INFO] [stdout]    |        ^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 8 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variant is never constructed: `Best`
[INFO] [stdout]  --> src/location.rs:9:5
[INFO] [stdout]   |
[INFO] [stdout] 9 |     Best,
[INFO] [stdout]   |     ^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variant is never constructed: `Local`
[INFO] [stdout]   --> src/location.rs:11:5
[INFO] [stdout]    |
[INFO] [stdout] 11 |     Local,
[INFO] [stdout]    |     ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variant is never constructed: `Global`
[INFO] [stdout]   --> src/location.rs:13:5
[INFO] [stdout]    |
[INFO] [stdout] 13 |     Global
[INFO] [stdout]    |     ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `get_location`
[INFO] [stdout]   --> src/location.rs:17:12
[INFO] [stdout]    |
[INFO] [stdout] 17 |     pub fn get_location() -> Location {
[INFO] [stdout]    |            ^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function is never used: `to_string_cap`
[INFO] [stdout]   --> src/location.rs:27:12
[INFO] [stdout]    |
[INFO] [stdout] 27 |     pub fn to_string_cap(&self) -> String {
[INFO] [stdout]    |            ^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `key_value_set`
[INFO] [stdout]   --> src/theme.rs:19:8
[INFO] [stdout]    |
[INFO] [stdout] 19 | pub fn key_value_set<T: AsRef<str>>(text : T) -> String {
[INFO] [stdout]    |        ^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `error`
[INFO] [stdout]   --> src/theme.rs:23:8
[INFO] [stdout]    |
[INFO] [stdout] 23 | pub fn error<T: AsRef<str>>(text : T) -> String {
[INFO] [stdout]    |        ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `error_message`
[INFO] [stdout]   --> src/theme.rs:26:8
[INFO] [stdout]    |
[INFO] [stdout] 26 | pub fn error_message<T: AsRef<str>>(text : T) -> String {
[INFO] [stdout]    |        ^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 8 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished test [unoptimized + debuginfo] target(s) in 1.03s
[INFO] running `Command { std: "docker" "inspect" "5f6a86387f5fe50cc0efc3667d969e7b541dfd263cfe12770bb4ecf159f282af", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "5f6a86387f5fe50cc0efc3667d969e7b541dfd263cfe12770bb4ecf159f282af", kill_on_drop: false }`
[INFO] [stdout] 5f6a86387f5fe50cc0efc3667d969e7b541dfd263cfe12770bb4ecf159f282af
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-4/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-4/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=warn" "-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@sha256:0cd99ca24d8e8c98e67c542213511d985b8778b5bdcbb160e038429496686047" "/opt/rustwide/cargo-home/bin/cargo" "+1.59.0" "test" "--frozen", kill_on_drop: false }`
[INFO] [stdout] fd70cb8ec3794461919c81b5f489408ae3346703ab12f51363418d7730e4159c
[INFO] running `Command { std: "docker" "start" "-a" "fd70cb8ec3794461919c81b5f489408ae3346703ab12f51363418d7730e4159c", kill_on_drop: false }`
[INFO] [stderr] warning: variant is never constructed: `Best`
[INFO] [stderr]  --> src/location.rs:9:5
[INFO] [stderr]   |
[INFO] [stderr] 9 |     Best,
[INFO] [stderr]   |     ^^^^
[INFO] [stderr]   |
[INFO] [stderr]   = note: `#[warn(dead_code)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: variant is never constructed: `Local`
[INFO] [stderr]   --> src/location.rs:11:5
[INFO] [stderr]    |
[INFO] [stderr] 11 |     Local,
[INFO] [stderr]    |     ^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: variant is never constructed: `Global`
[INFO] [stderr]   --> src/location.rs:13:5
[INFO] [stderr]    |
[INFO] [stderr] 13 |     Global
[INFO] [stderr]    |     ^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: associated function is never used: `get_location`
[INFO] [stderr]   --> src/location.rs:17:12
[INFO] [stderr]    |
[INFO] [stderr] 17 |     pub fn get_location() -> Location {
[INFO] [stderr]    |            ^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: associated function is never used: `to_string_cap`
[INFO] [stderr]   --> src/location.rs:27:12
[INFO] [stderr]    |
[INFO] [stderr] 27 |     pub fn to_string_cap(&self) -> String {
[INFO] [stderr]    |            ^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `key_value_set`
[INFO] [stderr]   --> src/theme.rs:19:8
[INFO] [stderr]    |
[INFO] [stderr] 19 | pub fn key_value_set<T: AsRef<str>>(text : T) -> String {
[INFO] [stderr]    |        ^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `error`
[INFO] [stderr]   --> src/theme.rs:23:8
[INFO] [stderr]    |
[INFO] [stderr] 23 | pub fn error<T: AsRef<str>>(text : T) -> String {
[INFO] [stderr]    |        ^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `error_message`
[INFO] [stderr]   --> src/theme.rs:26:8
[INFO] [stderr]    |
[INFO] [stderr] 26 | pub fn error_message<T: AsRef<str>>(text : T) -> String {
[INFO] [stderr]    |        ^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: `lpsettings` (lib) generated 8 warnings
[INFO] [stderr] warning: `lpsettings` (lib test) generated 8 warnings (8 duplicates)
[INFO] [stderr]     Finished test [unoptimized + debuginfo] target(s) in 0.12s
[INFO] [stderr]      Running unittests (/opt/rustwide/target/debug/deps/lpsettings-bd4199323531fb1f)
[INFO] [stdout] 
[INFO] [stderr]    Doc-tests lpsettings
[INFO] [stdout] running 0 tests
[INFO] [stdout] 
[INFO] [stdout] test result: ok. 0 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 0.00s
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] running 1 test
[INFO] [stderr] error: test failed, to rerun pass '--doc'
[INFO] [stdout] test src/map.rs - map::get_user_input (line 35) ... FAILED
[INFO] [stdout] 
[INFO] [stdout] failures:
[INFO] [stdout] 
[INFO] [stdout] ---- src/map.rs - map::get_user_input (line 35) stdout ----
[INFO] [stdout] error[E0425]: cannot find function `get_user_input` in this scope
[INFO] [stdout]  --> src/map.rs:36:1
[INFO] [stdout]   |
[INFO] [stdout] 3 | get_user_input("Some question for the user");
[INFO] [stdout]   | ^^^^^^^^^^^^^^ not found in this scope
[INFO] [stdout] 
[INFO] [stdout] error: aborting due to previous error
[INFO] [stdout] 
[INFO] [stdout] For more information about this error, try `rustc --explain E0425`.
[INFO] [stdout] Couldn't compile the test.
[INFO] [stdout] 
[INFO] [stdout] failures:
[INFO] [stdout]     src/map.rs - map::get_user_input (line 35)
[INFO] [stdout] 
[INFO] [stdout] test result: FAILED. 0 passed; 1 failed; 0 ignored; 0 measured; 0 filtered out; finished in 0.16s
[INFO] [stdout] 
[INFO] running `Command { std: "docker" "inspect" "fd70cb8ec3794461919c81b5f489408ae3346703ab12f51363418d7730e4159c", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "fd70cb8ec3794461919c81b5f489408ae3346703ab12f51363418d7730e4159c", kill_on_drop: false }`
[INFO] [stdout] fd70cb8ec3794461919c81b5f489408ae3346703ab12f51363418d7730e4159c