[INFO] fetching crate yarte_dom 0.15.1... [INFO] checking yarte_dom-0.15.1 against master#385fa9d845dd326c6bbfd58c22244215e431948a for absurd-question-mark-desugar [INFO] extracting crate yarte_dom 0.15.1 into /workspace/builds/worker-1-tc1/source [INFO] validating manifest of crates.io crate yarte_dom 0.15.1 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 crates.io crate yarte_dom 0.15.1 [INFO] finished tweaking crates.io crate yarte_dom 0.15.1 [INFO] tweaked toml for crates.io crate yarte_dom 0.15.1 written to /workspace/builds/worker-1-tc1/source/Cargo.toml [INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+385fa9d845dd326c6bbfd58c22244215e431948a" "generate-lockfile" "--manifest-path" "Cargo.toml", kill_on_drop: false }` [INFO] [stderr] Updating crates.io index [INFO] [stderr] Locking 74 packages [INFO] [stderr] Adding annotate-snippets v0.9.2 (latest: v0.11.1) [INFO] [stderr] Adding bitflags v1.3.2 (latest: v2.5.0) [INFO] [stderr] Adding convert_case v0.4.0 (latest: v0.6.0) [INFO] [stderr] Adding markup5ever v0.11.0 (latest: v0.12.0) [INFO] [stderr] Adding phf v0.10.1 (latest: v0.11.2) [INFO] [stderr] Adding phf_codegen v0.10.0 (latest: v0.11.2) [INFO] [stderr] Adding phf_generator v0.10.0 (latest: v0.11.2) [INFO] [stderr] Adding phf_shared v0.10.0 (latest: v0.11.2) [INFO] [stderr] Adding prettyplease v0.1.25 (latest: v0.2.17) [INFO] [stderr] Adding redox_syscall v0.4.1 (latest: v0.5.1) [INFO] [stderr] Adding siphasher v0.3.11 (latest: v1.0.1) [INFO] [stderr] Adding syn v1.0.109 (latest: v2.0.58) [INFO] [stderr] Adding toml v0.5.11 (latest: v0.8.12) [INFO] [stderr] Adding wasi v0.11.0+wasi-snapshot-preview1 (latest: v0.13.0+wasi-0.2.0) [INFO] [stderr] Adding windows-targets v0.48.5 (latest: v0.52.4) [INFO] [stderr] Adding windows_aarch64_gnullvm v0.48.5 (latest: v0.52.4) [INFO] [stderr] Adding windows_aarch64_msvc v0.48.5 (latest: v0.52.4) [INFO] [stderr] Adding windows_i686_gnu v0.48.5 (latest: v0.52.4) [INFO] [stderr] Adding windows_i686_msvc v0.48.5 (latest: v0.52.4) [INFO] [stderr] Adding windows_x86_64_gnu v0.48.5 (latest: v0.52.4) [INFO] [stderr] Adding windows_x86_64_gnullvm v0.48.5 (latest: v0.52.4) [INFO] [stderr] Adding windows_x86_64_msvc v0.48.5 (latest: v0.52.4) [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] Downloading crates ... [INFO] [stderr] Downloaded yarte_hir v0.15.6 [INFO] [stderr] Downloaded annotate-snippets v0.9.2 [INFO] [stderr] Downloaded yansi-term v0.1.2 [INFO] [stderr] Downloaded v_eval v0.6.0 [INFO] [stderr] Downloaded v_htmlescape v0.15.8 [INFO] [stderr] Downloaded yarte_html v0.15.2 [INFO] [stderr] Downloaded yarte_helpers v0.15.8 [INFO] [stderr] Downloaded yarte_parser v0.15.2 [INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-1-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-1-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] 0b28058d0985f22c56f0dcead71fbb2ff4dc85cb99b080f46068e93ecc69e301 [INFO] running `Command { std: "docker" "start" "-a" "0b28058d0985f22c56f0dcead71fbb2ff4dc85cb99b080f46068e93ecc69e301", kill_on_drop: false }` [INFO] running `Command { std: "docker" "inspect" "0b28058d0985f22c56f0dcead71fbb2ff4dc85cb99b080f46068e93ecc69e301", kill_on_drop: false }` [INFO] running `Command { std: "docker" "rm" "-f" "0b28058d0985f22c56f0dcead71fbb2ff4dc85cb99b080f46068e93ecc69e301", kill_on_drop: false }` [INFO] [stdout] 0b28058d0985f22c56f0dcead71fbb2ff4dc85cb99b080f46068e93ecc69e301 [INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-1-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-1-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] 8b4cc2399c59e05f4ac2fa4aaf96f6b89d2da046d125eb444945057934807747 [INFO] running `Command { std: "docker" "start" "-a" "8b4cc2399c59e05f4ac2fa4aaf96f6b89d2da046d125eb444945057934807747", kill_on_drop: false }` [INFO] [stderr] Compiling proc-macro2 v1.0.79 [INFO] [stderr] Compiling syn v1.0.109 [INFO] [stderr] Checking unicode-ident v1.0.12 [INFO] [stderr] Compiling ppv-lite86 v0.2.17 [INFO] [stderr] Compiling siphasher v0.3.11 [INFO] [stderr] Compiling v_htmlescape v0.15.8 [INFO] [stderr] Checking memchr v2.7.2 [INFO] [stderr] Compiling prettyplease v0.1.25 [INFO] [stderr] Checking new_debug_unreachable v1.0.6 [INFO] [stderr] Checking mac v0.1.1 [INFO] [stderr] Compiling libc v0.2.153 [INFO] [stderr] Checking yansi-term v0.1.2 [INFO] [stderr] Checking dtoa v1.0.9 [INFO] [stderr] Checking unicode-xid v0.2.4 [INFO] [stderr] Checking precomputed-hash v0.1.1 [INFO] [stderr] Checking utf-8 v0.7.6 [INFO] [stderr] Checking futf v0.1.5 [INFO] [stderr] Compiling phf_shared v0.10.0 [INFO] [stderr] Checking annotate-snippets v0.9.2 [INFO] [stderr] Checking tendril v0.4.3 [INFO] [stderr] Checking phf v0.10.1 [INFO] [stderr] Checking aho-corasick v1.1.3 [INFO] [stderr] Compiling getrandom v0.2.12 [INFO] [stderr] Checking quote v1.0.35 [INFO] [stderr] Compiling rand_core v0.6.4 [INFO] [stderr] Compiling syn v2.0.58 [INFO] [stderr] Compiling rand_chacha v0.3.1 [INFO] [stderr] Compiling rand v0.8.5 [INFO] [stderr] Checking regex-automata v0.4.6 [INFO] [stderr] Compiling phf_generator v0.10.0 [INFO] [stderr] Compiling phf_codegen v0.10.0 [INFO] [stderr] Compiling string_cache_codegen v0.5.2 [INFO] [stderr] Compiling markup5ever v0.11.0 [INFO] [stderr] Compiling serde_derive v1.0.197 [INFO] [stderr] Checking regex v1.10.4 [INFO] [stderr] Checking v_eval v0.6.0 [INFO] [stderr] Compiling derive_more v0.99.17 [INFO] [stderr] Compiling yarte_html v0.15.2 [INFO] [stderr] Checking serde v1.0.197 [INFO] [stderr] Checking toml v0.5.11 [INFO] [stderr] Checking string_cache v0.8.7 [INFO] [stderr] Checking yarte_helpers v0.15.8 [INFO] [stderr] Checking yarte_parser v0.15.2 [INFO] [stderr] Checking yarte_hir v0.15.6 [INFO] [stderr] Checking yarte_dom v0.15.1 (/opt/rustwide/workdir) [INFO] [stdout] warning: field `0` is never read [INFO] [stdout] --> src/sink.rs:135:23 [INFO] [stdout] | [INFO] [stdout] 135 | pub struct ParseError(Cow<'static, str>); [INFO] [stdout] | ---------- ^^^^^^^^^^^^^^^^^ [INFO] [stdout] | | [INFO] [stdout] | field in this struct [INFO] [stdout] | [INFO] [stdout] = note: `ParseError` has a derived impl for the trait `Debug`, but this is intentionally ignored during dead code analysis [INFO] [stdout] = note: `#[warn(dead_code)]` on by default [INFO] [stdout] help: consider changing the field to be of unit type to suppress this warning while preserving the field numbering, or remove the field [INFO] [stdout] | [INFO] [stdout] 135 | pub struct ParseError(()); [INFO] [stdout] | ~~ [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: field `0` is never read [INFO] [stdout] --> src/sink.rs:135:23 [INFO] [stdout] | [INFO] [stdout] 135 | pub struct ParseError(Cow<'static, str>); [INFO] [stdout] | ---------- ^^^^^^^^^^^^^^^^^ [INFO] [stdout] | | [INFO] [stdout] | field in this struct [INFO] [stdout] | [INFO] [stdout] = note: `ParseError` has a derived impl for the trait `Debug`, but this is intentionally ignored during dead code analysis [INFO] [stdout] = note: `#[warn(dead_code)]` on by default [INFO] [stdout] help: consider changing the field to be of unit type to suppress this warning while preserving the field numbering, or remove the field [INFO] [stdout] | [INFO] [stdout] 135 | pub struct ParseError(()); [INFO] [stdout] | ~~ [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: 1 warning emitted [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: 1 warning emitted [INFO] [stdout] [INFO] [stdout] [INFO] [stderr] Finished `dev` profile [unoptimized + debuginfo] target(s) in 15.27s [INFO] running `Command { std: "docker" "inspect" "8b4cc2399c59e05f4ac2fa4aaf96f6b89d2da046d125eb444945057934807747", kill_on_drop: false }` [INFO] running `Command { std: "docker" "rm" "-f" "8b4cc2399c59e05f4ac2fa4aaf96f6b89d2da046d125eb444945057934807747", kill_on_drop: false }` [INFO] [stdout] 8b4cc2399c59e05f4ac2fa4aaf96f6b89d2da046d125eb444945057934807747 [INFO] checking yarte_dom-0.15.1 against try#645bb72776a6a56a1a8f52631a44bd082b2ba509 for absurd-question-mark-desugar [INFO] extracting crate yarte_dom 0.15.1 into /workspace/builds/worker-1-tc2/source [INFO] validating manifest of crates.io crate yarte_dom 0.15.1 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 crates.io crate yarte_dom 0.15.1 [INFO] finished tweaking crates.io crate yarte_dom 0.15.1 [INFO] tweaked toml for crates.io crate yarte_dom 0.15.1 written to /workspace/builds/worker-1-tc2/source/Cargo.toml [INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+645bb72776a6a56a1a8f52631a44bd082b2ba509" "generate-lockfile" "--manifest-path" "Cargo.toml", kill_on_drop: false }` [INFO] [stderr] Updating crates.io index [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-1-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-1-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] 3c499310425b9b723e6766c3b9774f6d1a7763c4f171d4915448555cd566a1d2 [INFO] running `Command { std: "docker" "start" "-a" "3c499310425b9b723e6766c3b9774f6d1a7763c4f171d4915448555cd566a1d2", kill_on_drop: false }` [INFO] running `Command { std: "docker" "inspect" "3c499310425b9b723e6766c3b9774f6d1a7763c4f171d4915448555cd566a1d2", kill_on_drop: false }` [INFO] running `Command { std: "docker" "rm" "-f" "3c499310425b9b723e6766c3b9774f6d1a7763c4f171d4915448555cd566a1d2", kill_on_drop: false }` [INFO] [stdout] 3c499310425b9b723e6766c3b9774f6d1a7763c4f171d4915448555cd566a1d2 [INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-1-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-1-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] 1631d2300d1361eab99f2ac561ec2bce9c2f7ac82b323086b9262daba46b5fc7 [INFO] running `Command { std: "docker" "start" "-a" "1631d2300d1361eab99f2ac561ec2bce9c2f7ac82b323086b9262daba46b5fc7", kill_on_drop: false }` [INFO] [stderr] Compiling proc-macro2 v1.0.79 [INFO] [stderr] Compiling syn v1.0.109 [INFO] [stderr] Checking unicode-ident v1.0.12 [INFO] [stderr] Compiling ppv-lite86 v0.2.17 [INFO] [stderr] Compiling siphasher v0.3.11 [INFO] [stderr] Compiling v_htmlescape v0.15.8 [INFO] [stderr] Checking memchr v2.7.2 [INFO] [stderr] Compiling prettyplease v0.1.25 [INFO] [stderr] Checking new_debug_unreachable v1.0.6 [INFO] [stderr] Compiling libc v0.2.153 [INFO] [stderr] Checking yansi-term v0.1.2 [INFO] [stderr] Checking dtoa v1.0.9 [INFO] [stderr] Checking mac v0.1.1 [INFO] [stderr] Checking precomputed-hash v0.1.1 [INFO] [stderr] Checking unicode-xid v0.2.4 [INFO] [stderr] Checking utf-8 v0.7.6 [INFO] [stderr] Checking futf v0.1.5 [INFO] [stderr] Checking phf_shared v0.10.0 [INFO] [stderr] Checking annotate-snippets v0.9.2 [INFO] [stderr] Checking tendril v0.4.3 [INFO] [stderr] Checking phf v0.10.1 [INFO] [stderr] Checking aho-corasick v1.1.3 [INFO] [stderr] Compiling getrandom v0.2.12 [INFO] [stderr] Checking quote v1.0.35 [INFO] [stderr] Compiling rand_core v0.6.4 [INFO] [stderr] Compiling syn v2.0.58 [INFO] [stderr] Compiling rand_chacha v0.3.1 [INFO] [stderr] Compiling rand v0.8.5 [INFO] [stderr] Checking regex-automata v0.4.6 [INFO] [stderr] Compiling phf_generator v0.10.0 [INFO] [stderr] Compiling phf_codegen v0.10.0 [INFO] [stderr] Compiling string_cache_codegen v0.5.2 [INFO] [stderr] Compiling markup5ever v0.11.0 [INFO] [stderr] Compiling serde_derive v1.0.197 [INFO] [stderr] Checking regex v1.10.4 [INFO] [stderr] Checking v_eval v0.6.0 [INFO] [stderr] Checking serde v1.0.197 [INFO] [stderr] Compiling derive_more v0.99.17 [INFO] [stderr] Compiling yarte_html v0.15.2 [INFO] [stderr] Checking toml v0.5.11 [INFO] [stderr] Checking string_cache v0.8.7 [INFO] [stderr] Checking yarte_helpers v0.15.8 [INFO] [stderr] Checking yarte_parser v0.15.2 [INFO] [stderr] Checking yarte_hir v0.15.6 [INFO] [stderr] Checking yarte_dom v0.15.1 (/opt/rustwide/workdir) [INFO] [stdout] warning: field `0` is never read [INFO] [stdout] --> src/sink.rs:135:23 [INFO] [stdout] | [INFO] [stdout] 135 | pub struct ParseError(Cow<'static, str>); [INFO] [stdout] | ---------- ^^^^^^^^^^^^^^^^^ [INFO] [stdout] | | [INFO] [stdout] | field in this struct [INFO] [stdout] | [INFO] [stdout] = note: `ParseError` has a derived impl for the trait `Debug`, but this is intentionally ignored during dead code analysis [INFO] [stdout] = note: `#[warn(dead_code)]` on by default [INFO] [stdout] help: consider changing the field to be of unit type to suppress this warning while preserving the field numbering, or remove the field [INFO] [stdout] | [INFO] [stdout] 135 | pub struct ParseError(()); [INFO] [stdout] | ~~ [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: field `0` is never read [INFO] [stdout] --> src/sink.rs:135:23 [INFO] [stdout] | [INFO] [stdout] 135 | pub struct ParseError(Cow<'static, str>); [INFO] [stdout] | ---------- ^^^^^^^^^^^^^^^^^ [INFO] [stdout] | | [INFO] [stdout] | field in this struct [INFO] [stdout] | [INFO] [stdout] = note: `ParseError` has a derived impl for the trait `Debug`, but this is intentionally ignored during dead code analysis [INFO] [stdout] = note: `#[warn(dead_code)]` on by default [INFO] [stdout] help: consider changing the field to be of unit type to suppress this warning while preserving the field numbering, or remove the field [INFO] [stdout] | [INFO] [stdout] 135 | pub struct ParseError(()); [INFO] [stdout] | ~~ [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: 1 warning emitted [INFO] [stdout] [INFO] [stdout] [INFO] [stdout] warning: 1 warning emitted [INFO] [stdout] [INFO] [stdout] [INFO] [stderr] Finished `dev` profile [unoptimized + debuginfo] target(s) in 12.20s [INFO] running `Command { std: "docker" "inspect" "1631d2300d1361eab99f2ac561ec2bce9c2f7ac82b323086b9262daba46b5fc7", kill_on_drop: false }` [INFO] running `Command { std: "docker" "rm" "-f" "1631d2300d1361eab99f2ac561ec2bce9c2f7ac82b323086b9262daba46b5fc7", kill_on_drop: false }` [INFO] [stdout] 1631d2300d1361eab99f2ac561ec2bce9c2f7ac82b323086b9262daba46b5fc7