[INFO] cloning repository https://github.com/dfhoughton/jobrog [INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/dfhoughton/jobrog" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fdfhoughton%2Fjobrog", kill_on_drop: false }` [INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fdfhoughton%2Fjobrog'... [INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }` [INFO] [stdout] cd7d633d995eb1de0971927c4ae3aded0f815c3a [INFO] checking dfhoughton/jobrog against master#385fa9d845dd326c6bbfd58c22244215e431948a for absurd-question-mark-desugar [INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fdfhoughton%2Fjobrog" "/workspace/builds/worker-7-tc1/source", kill_on_drop: false }` [INFO] [stderr] Cloning into '/workspace/builds/worker-7-tc1/source'... [INFO] [stderr] done. [INFO] validating manifest of git repo https://github.com/dfhoughton/jobrog on toolchain 385fa9d845dd326c6bbfd58c22244215e431948a [INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+385fa9d845dd326c6bbfd58c22244215e431948a" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }` [INFO] started tweaking git repo https://github.com/dfhoughton/jobrog [INFO] finished tweaking git repo https://github.com/dfhoughton/jobrog [INFO] tweaked toml for git repo https://github.com/dfhoughton/jobrog written to /workspace/builds/worker-7-tc1/source/Cargo.toml [INFO] crate git repo https://github.com/dfhoughton/jobrog already has a lockfile, it will not be regenerated [INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+385fa9d845dd326c6bbfd58c22244215e431948a" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }` [INFO] [stderr] Updating crates.io index [INFO] [stderr] Downloading crates ... [INFO] [stderr] Downloaded two_timer v2.1.0 [INFO] [stderr] Downloaded const-random-macro v0.1.8 [INFO] [stderr] Downloaded const-random v0.1.8 [INFO] [stderr] Downloaded serde_json v1.0.49 [INFO] [stderr] Downloaded larry v0.3.0 [INFO] [stderr] Downloaded utf8parse v0.1.1 [INFO] [stderr] Downloaded strip-ansi-escapes v0.1.0 [INFO] [stderr] Downloaded hashbrown v0.7.0 [INFO] [stderr] Downloaded ahash v0.3.2 [INFO] [stderr] Downloaded regex-syntax v0.6.16 [INFO] [stderr] Downloaded colonnade v1.3.1 [INFO] [stderr] Downloaded pidgin v0.4.0 [INFO] [stderr] Downloaded ordered-multimap v0.2.4 [INFO] [stderr] Downloaded rust-ini v0.15.2 [INFO] [stderr] Downloaded serde_regex v0.4.0 [INFO] [stderr] Downloaded vte v0.3.3 [INFO] [stderr] Downloaded proc-macro2 v1.0.4 [INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-7-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-7-tc1/source:/opt/rustwide/workdir:ro,Z" "-v" "/var/lib/crater-agent-workspace/cargo-home:/opt/rustwide/cargo-home:ro,Z" "-v" "/var/lib/crater-agent-workspace/rustup-home:/opt/rustwide/rustup-home:ro,Z" "-e" "SOURCE_DIR=/opt/rustwide/workdir" "-e" "CARGO_TARGET_DIR=/opt/rustwide/target" "-e" "CARGO_HOME=/opt/rustwide/cargo-home" "-e" "RUSTUP_HOME=/opt/rustwide/rustup-home" "-w" "/opt/rustwide/workdir" "-m" "1610612736" "--user" "0:0" "--network" "none" "ghcr.io/rust-lang/crates-build-env/linux@sha256:2788e3201cd34a07e3172128adcd8b3090168a8e3bcc40d7c032b9dda1df7d1c" "/opt/rustwide/cargo-home/bin/cargo" "+385fa9d845dd326c6bbfd58c22244215e431948a" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }` [INFO] [stdout] 5e73995ed74143b5bdffd3e2b251b90134c5f87b2c2a7a3b0218ed26cbfa230e [INFO] running `Command { std: "docker" "start" "-a" "5e73995ed74143b5bdffd3e2b251b90134c5f87b2c2a7a3b0218ed26cbfa230e", kill_on_drop: false }` [INFO] running `Command { std: "docker" "inspect" "5e73995ed74143b5bdffd3e2b251b90134c5f87b2c2a7a3b0218ed26cbfa230e", kill_on_drop: false }` [INFO] running `Command { std: "docker" "rm" "-f" "5e73995ed74143b5bdffd3e2b251b90134c5f87b2c2a7a3b0218ed26cbfa230e", kill_on_drop: false }` [INFO] [stdout] 5e73995ed74143b5bdffd3e2b251b90134c5f87b2c2a7a3b0218ed26cbfa230e [INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-7-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-7-tc1/source:/opt/rustwide/workdir:ro,Z" "-v" "/var/lib/crater-agent-workspace/cargo-home:/opt/rustwide/cargo-home:ro,Z" "-v" "/var/lib/crater-agent-workspace/rustup-home:/opt/rustwide/rustup-home:ro,Z" "-e" "SOURCE_DIR=/opt/rustwide/workdir" "-e" "CARGO_TARGET_DIR=/opt/rustwide/target" "-e" "CARGO_INCREMENTAL=0" "-e" "RUST_BACKTRACE=full" "-e" "RUSTFLAGS=--cap-lints=forbid" "-e" "RUSTDOCFLAGS=--cap-lints=forbid" "-e" "CARGO_HOME=/opt/rustwide/cargo-home" "-e" "RUSTUP_HOME=/opt/rustwide/rustup-home" "-w" "/opt/rustwide/workdir" "-m" "1610612736" "--user" "0:0" "--network" "none" "ghcr.io/rust-lang/crates-build-env/linux@sha256:2788e3201cd34a07e3172128adcd8b3090168a8e3bcc40d7c032b9dda1df7d1c" "/opt/rustwide/cargo-home/bin/cargo" "+385fa9d845dd326c6bbfd58c22244215e431948a" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }` [INFO] [stdout] fb45b811db4e69cb9478bc46159533831e974e3c159764433578f8c33a998ae2 [INFO] running `Command { std: "docker" "start" "-a" "fb45b811db4e69cb9478bc46159533831e974e3c159764433578f8c33a998ae2", kill_on_drop: false }` [INFO] [stderr] Compiling libc v0.2.66 [INFO] [stderr] Compiling proc-macro2 v1.0.4 [INFO] [stderr] Compiling syn v1.0.5 [INFO] [stderr] Checking spin v0.5.2 [INFO] [stderr] Compiling autocfg v0.1.4 [INFO] [stderr] Compiling memchr v2.2.1 [INFO] [stderr] Compiling serde v1.0.101 [INFO] [stderr] Checking ppv-lite86 v0.2.6 [INFO] [stderr] Checking regex-syntax v0.6.16 [INFO] [stderr] Compiling ryu v1.0.2 [INFO] [stderr] Compiling bitflags v1.1.0 [INFO] [stderr] Checking cfg-if v0.1.9 [INFO] [stderr] Checking utf8parse v0.1.1 [INFO] [stderr] Compiling hashbrown v0.7.0 [INFO] [stderr] Checking itoa v0.4.4 [INFO] [stderr] Checking unicode-width v0.1.5 [INFO] [stderr] Checking vte v0.3.3 [INFO] [stderr] Checking lazy_static v1.4.0 [INFO] [stderr] Checking thread_local v1.0.1 [INFO] [stderr] Checking adler32 v1.0.4 [INFO] [stderr] Checking strip-ansi-escapes v0.1.0 [INFO] [stderr] Checking textwrap v0.11.0 [INFO] [stderr] Checking crc32fast v1.2.0 [INFO] [stderr] Checking miniz_oxide v0.3.5 [INFO] [stderr] Checking unicode-segmentation v1.6.0 [INFO] [stderr] Checking vec_map v0.8.1 [INFO] [stderr] Compiling num-traits v0.2.8 [INFO] [stderr] Compiling num-integer v0.1.41 [INFO] [stderr] Checking ansi_term v0.12.1 [INFO] [stderr] Checking larry v0.3.0 [INFO] [stderr] Checking c2-chacha v0.2.3 [INFO] [stderr] Checking aho-corasick v0.7.6 [INFO] [stderr] Compiling quote v1.0.2 [INFO] [stderr] Checking getrandom v0.1.6 [INFO] [stderr] Checking time v0.1.42 [INFO] [stderr] Checking atty v0.2.11 [INFO] [stderr] Checking dirs-sys v0.3.6 [INFO] [stderr] Checking flate2 v1.0.13 [INFO] [stderr] Checking term_size v0.3.1 [INFO] [stderr] Checking clap v2.34.0 [INFO] [stderr] Checking dirs v4.0.0 [INFO] [stderr] Checking rand_core v0.5.1 [INFO] [stderr] Checking rand_chacha v0.2.1 [INFO] [stderr] Checking rand v0.7.3 [INFO] [stderr] Checking regex v1.3.4 [INFO] [stderr] Checking chrono v0.4.10 [INFO] [stderr] Checking dlv-list v0.2.2 [INFO] [stderr] Checking colonnade v1.3.1 [INFO] [stderr] Compiling proc-macro-hack v0.5.11 [INFO] [stderr] Compiling serde_derive v1.0.101 [INFO] [stderr] Compiling const-random-macro v0.1.8 [INFO] [stderr] Checking const-random v0.1.8 [INFO] [stderr] Checking ahash v0.3.2 [INFO] [stderr] Checking ordered-multimap v0.2.4 [INFO] [stderr] Checking rust-ini v0.15.2 [INFO] [stderr] Checking serde_regex v0.4.0 [INFO] [stderr] Checking serde_json v1.0.49 [INFO] [stderr] Checking pidgin v0.4.0 [INFO] [stderr] Checking two_timer v2.1.0 [INFO] [stderr] Checking jobrog v1.1.0 (/opt/rustwide/workdir) [INFO] [stdout] warning: the item `Duration` is imported redundantly [INFO] [stdout] --> src/log.rs:638:9 [INFO] [stdout] | [INFO] [stdout] 637 | use super::*; [INFO] [stdout] | -------- the item `Duration` is already imported here [INFO] [stdout] 638 | use chrono::Duration; [INFO] [stdout] | ^^^^^^^^^^^^^^^^ [INFO] [stdout] | [INFO] [stdout] = note: `#[warn(unused_imports)]` on by default [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: the item `File` is imported redundantly [INFO] [stdout] --> src/log.rs:641:9 [INFO] [stdout] | [INFO] [stdout] 637 | use super::*; [INFO] [stdout] | -------- the item `File` is already imported here [INFO] [stdout] ... [INFO] [stdout] 641 | use std::fs::File; [INFO] [stdout] | ^^^^^^^^^^^^^ [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: the item `Event` is imported redundantly [INFO] [stdout] --> src/vacation.rs:1269:28 [INFO] [stdout] | [INFO] [stdout] 1268 | use super::*; [INFO] [stdout] | -------- the item `Event` is already imported here [INFO] [stdout] 1269 | use crate::log::{Done, Event, LogController}; [INFO] [stdout] | ^^^^^ [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: 3 warnings emitted [INFO] [stdout] [INFO] [stdout] [INFO] [stderr] Finished `dev` profile [unoptimized + debuginfo] target(s) in 16.58s [INFO] running `Command { std: "docker" "inspect" "fb45b811db4e69cb9478bc46159533831e974e3c159764433578f8c33a998ae2", kill_on_drop: false }` [INFO] running `Command { std: "docker" "rm" "-f" "fb45b811db4e69cb9478bc46159533831e974e3c159764433578f8c33a998ae2", kill_on_drop: false }` [INFO] [stdout] fb45b811db4e69cb9478bc46159533831e974e3c159764433578f8c33a998ae2 [INFO] checking dfhoughton/jobrog against try#645bb72776a6a56a1a8f52631a44bd082b2ba509 for absurd-question-mark-desugar [INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fdfhoughton%2Fjobrog" "/workspace/builds/worker-7-tc2/source", kill_on_drop: false }` [INFO] [stderr] Cloning into '/workspace/builds/worker-7-tc2/source'... [INFO] [stderr] done. [INFO] validating manifest of git repo https://github.com/dfhoughton/jobrog on toolchain 645bb72776a6a56a1a8f52631a44bd082b2ba509 [INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+645bb72776a6a56a1a8f52631a44bd082b2ba509" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }` [INFO] started tweaking git repo https://github.com/dfhoughton/jobrog [INFO] finished tweaking git repo https://github.com/dfhoughton/jobrog [INFO] tweaked toml for git repo https://github.com/dfhoughton/jobrog written to /workspace/builds/worker-7-tc2/source/Cargo.toml [INFO] crate git repo https://github.com/dfhoughton/jobrog already has a lockfile, it will not be regenerated [INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+645bb72776a6a56a1a8f52631a44bd082b2ba509" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }` [INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-7-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-7-tc2/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@sha256:2788e3201cd34a07e3172128adcd8b3090168a8e3bcc40d7c032b9dda1df7d1c" "/opt/rustwide/cargo-home/bin/cargo" "+645bb72776a6a56a1a8f52631a44bd082b2ba509" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }` [INFO] [stdout] db747519dd43f3457bf4678470838d1af6f8a468716ce28b95c1a0717f1b0c3c [INFO] running `Command { std: "docker" "start" "-a" "db747519dd43f3457bf4678470838d1af6f8a468716ce28b95c1a0717f1b0c3c", kill_on_drop: false }` [INFO] running `Command { std: "docker" "inspect" "db747519dd43f3457bf4678470838d1af6f8a468716ce28b95c1a0717f1b0c3c", kill_on_drop: false }` [INFO] running `Command { std: "docker" "rm" "-f" "db747519dd43f3457bf4678470838d1af6f8a468716ce28b95c1a0717f1b0c3c", kill_on_drop: false }` [INFO] [stdout] db747519dd43f3457bf4678470838d1af6f8a468716ce28b95c1a0717f1b0c3c [INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-7-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-7-tc2/source:/opt/rustwide/workdir:ro,Z" "-v" "/var/lib/crater-agent-workspace/cargo-home:/opt/rustwide/cargo-home:ro,Z" "-v" "/var/lib/crater-agent-workspace/rustup-home:/opt/rustwide/rustup-home:ro,Z" "-e" "SOURCE_DIR=/opt/rustwide/workdir" "-e" "CARGO_TARGET_DIR=/opt/rustwide/target" "-e" "CARGO_INCREMENTAL=0" "-e" "RUST_BACKTRACE=full" "-e" "RUSTFLAGS=--cap-lints=forbid" "-e" "RUSTDOCFLAGS=--cap-lints=forbid" "-e" "CARGO_HOME=/opt/rustwide/cargo-home" "-e" "RUSTUP_HOME=/opt/rustwide/rustup-home" "-w" "/opt/rustwide/workdir" "-m" "1610612736" "--user" "0:0" "--network" "none" "ghcr.io/rust-lang/crates-build-env/linux@sha256:2788e3201cd34a07e3172128adcd8b3090168a8e3bcc40d7c032b9dda1df7d1c" "/opt/rustwide/cargo-home/bin/cargo" "+645bb72776a6a56a1a8f52631a44bd082b2ba509" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }` [INFO] [stdout] 82c98ac66d0258be106b9498ba2c6683ec5bfda5d481a0d5e582e6831ae4b11c [INFO] running `Command { std: "docker" "start" "-a" "82c98ac66d0258be106b9498ba2c6683ec5bfda5d481a0d5e582e6831ae4b11c", kill_on_drop: false }` [INFO] [stderr] Compiling libc v0.2.66 [INFO] [stderr] Compiling proc-macro2 v1.0.4 [INFO] [stderr] Compiling syn v1.0.5 [INFO] [stderr] Checking spin v0.5.2 [INFO] [stderr] Compiling autocfg v0.1.4 [INFO] [stderr] Compiling memchr v2.2.1 [INFO] [stderr] Checking ppv-lite86 v0.2.6 [INFO] [stderr] Compiling serde v1.0.101 [INFO] [stderr] Checking regex-syntax v0.6.16 [INFO] [stderr] Compiling ryu v1.0.2 [INFO] [stderr] Checking cfg-if v0.1.9 [INFO] [stderr] Checking utf8parse v0.1.1 [INFO] [stderr] Compiling hashbrown v0.7.0 [INFO] [stderr] Compiling bitflags v1.1.0 [INFO] [stderr] Checking adler32 v1.0.4 [INFO] [stderr] Compiling lazy_static v1.4.0 [INFO] [stderr] Checking itoa v0.4.4 [INFO] [stderr] Checking unicode-width v0.1.5 [INFO] [stderr] Checking vte v0.3.3 [INFO] [stderr] Checking crc32fast v1.2.0 [INFO] [stderr] Checking thread_local v1.0.1 [INFO] [stderr] Checking textwrap v0.11.0 [INFO] [stderr] Checking miniz_oxide v0.3.5 [INFO] [stderr] Checking strip-ansi-escapes v0.1.0 [INFO] [stderr] Checking unicode-segmentation v1.6.0 [INFO] [stderr] Checking c2-chacha v0.2.3 [INFO] [stderr] Checking ansi_term v0.12.1 [INFO] [stderr] Compiling num-traits v0.2.8 [INFO] [stderr] Compiling num-integer v0.1.41 [INFO] [stderr] Checking vec_map v0.8.1 [INFO] [stderr] Checking larry v0.3.0 [INFO] [stderr] Checking aho-corasick v0.7.6 [INFO] [stderr] Compiling getrandom v0.1.6 [INFO] [stderr] Checking time v0.1.42 [INFO] [stderr] Checking atty v0.2.11 [INFO] [stderr] Checking dirs-sys v0.3.6 [INFO] [stderr] Checking flate2 v1.0.13 [INFO] [stderr] Checking term_size v0.3.1 [INFO] [stderr] Checking clap v2.34.0 [INFO] [stderr] Checking rand_core v0.5.1 [INFO] [stderr] Checking dirs v4.0.0 [INFO] [stderr] Compiling quote v1.0.2 [INFO] [stderr] Checking rand_chacha v0.2.1 [INFO] [stderr] Checking rand v0.7.3 [INFO] [stderr] Checking chrono v0.4.10 [INFO] [stderr] Checking regex v1.3.4 [INFO] [stderr] Checking dlv-list v0.2.2 [INFO] [stderr] Checking colonnade v1.3.1 [INFO] [stderr] Compiling proc-macro-hack v0.5.11 [INFO] [stderr] Compiling serde_derive v1.0.101 [INFO] [stderr] Compiling const-random-macro v0.1.8 [INFO] [stderr] Checking const-random v0.1.8 [INFO] [stderr] Checking ahash v0.3.2 [INFO] [stderr] Checking ordered-multimap v0.2.4 [INFO] [stderr] Checking rust-ini v0.15.2 [INFO] [stderr] Checking serde_regex v0.4.0 [INFO] [stderr] Checking serde_json v1.0.49 [INFO] [stderr] Checking pidgin v0.4.0 [INFO] [stderr] Checking two_timer v2.1.0 [INFO] [stderr] Checking jobrog v1.1.0 (/opt/rustwide/workdir) [INFO] [stdout] warning: the item `Duration` is imported redundantly [INFO] [stdout] --> src/log.rs:638:9 [INFO] [stdout] | [INFO] [stdout] 637 | use super::*; [INFO] [stdout] | -------- the item `Duration` is already imported here [INFO] [stdout] 638 | use chrono::Duration; [INFO] [stdout] | ^^^^^^^^^^^^^^^^ [INFO] [stdout] | [INFO] [stdout] = note: `#[warn(unused_imports)]` on by default [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: the item `File` is imported redundantly [INFO] [stdout] --> src/log.rs:641:9 [INFO] [stdout] | [INFO] [stdout] 637 | use super::*; [INFO] [stdout] | -------- the item `File` is already imported here [INFO] [stdout] ... [INFO] [stdout] 641 | use std::fs::File; [INFO] [stdout] | ^^^^^^^^^^^^^ [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: the item `Event` is imported redundantly [INFO] [stdout] --> src/vacation.rs:1269:28 [INFO] [stdout] | [INFO] [stdout] 1268 | use super::*; [INFO] [stdout] | -------- the item `Event` is already imported here [INFO] [stdout] 1269 | use crate::log::{Done, Event, LogController}; [INFO] [stdout] | ^^^^^ [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: 3 warnings emitted [INFO] [stdout] [INFO] [stdout] [INFO] [stderr] Finished `dev` profile [unoptimized + debuginfo] target(s) in 11.75s [INFO] running `Command { std: "docker" "inspect" "82c98ac66d0258be106b9498ba2c6683ec5bfda5d481a0d5e582e6831ae4b11c", kill_on_drop: false }` [INFO] running `Command { std: "docker" "rm" "-f" "82c98ac66d0258be106b9498ba2c6683ec5bfda5d481a0d5e582e6831ae4b11c", kill_on_drop: false }` [INFO] [stdout] 82c98ac66d0258be106b9498ba2c6683ec5bfda5d481a0d5e582e6831ae4b11c