[INFO] crate cassandra-cpp-sys 0.12.0 is already in cache
[INFO] extracting crate cassandra-cpp-sys 0.12.0 into work/ex/pr-63247/sources/master#452087b4bf18cece2d52d7cd8c9147195e5404bf/reg/cassandra-cpp-sys/0.12.0
[INFO] extracting crate cassandra-cpp-sys 0.12.0 into work/ex/pr-63247/sources/try#757dacae0a9f1b46b3ab58a1f1232332e8fc7dab/reg/cassandra-cpp-sys/0.12.0
[INFO] validating manifest of cassandra-cpp-sys-0.12.0 on toolchain master#452087b4bf18cece2d52d7cd8c9147195e5404bf
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+452087b4bf18cece2d52d7cd8c9147195e5404bf-alt" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] validating manifest of cassandra-cpp-sys-0.12.0 on toolchain try#757dacae0a9f1b46b3ab58a1f1232332e8fc7dab
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+757dacae0a9f1b46b3ab58a1f1232332e8fc7dab-alt" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] started frobbing cassandra-cpp-sys-0.12.0
[INFO] finished frobbing cassandra-cpp-sys-0.12.0
[INFO] frobbed toml for cassandra-cpp-sys-0.12.0 written to work/ex/pr-63247/sources/master#452087b4bf18cece2d52d7cd8c9147195e5404bf/reg/cassandra-cpp-sys/0.12.0/Cargo.toml
[INFO] started frobbing cassandra-cpp-sys-0.12.0
[INFO] finished frobbing cassandra-cpp-sys-0.12.0
[INFO] frobbed toml for cassandra-cpp-sys-0.12.0 written to work/ex/pr-63247/sources/try#757dacae0a9f1b46b3ab58a1f1232332e8fc7dab/reg/cassandra-cpp-sys/0.12.0/Cargo.toml
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+452087b4bf18cece2d52d7cd8c9147195e5404bf-alt" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update"`
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+757dacae0a9f1b46b3ab58a1f1232332e8fc7dab-alt" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update"`
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+452087b4bf18cece2d52d7cd8c9147195e5404bf-alt" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+757dacae0a9f1b46b3ab58a1f1232332e8fc7dab-alt" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] checking cassandra-cpp-sys-0.12.0 against try#757dacae0a9f1b46b3ab58a1f1232332e8fc7dab for pr-63247
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/pr-63247/worker-1/try#757dacae0a9f1b46b3ab58a1f1232332e8fc7dab:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/pr-63247/sources/try#757dacae0a9f1b46b3ab58a1f1232332e8fc7dab/reg/cassandra-cpp-sys/0.12.0:/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" "+757dacae0a9f1b46b3ab58a1f1232332e8fc7dab-alt" "check" "--frozen" "--all" "--all-targets"`
[INFO] [stdout] 1912bc7ce8867e0c8c0ea89e7d787ed44f17c42c09156b6bdd4dae85e660ffa9
[INFO] running `"docker" "start" "-a" "1912bc7ce8867e0c8c0ea89e7d787ed44f17c42c09156b6bdd4dae85e660ffa9"`
[INFO] [stderr]    Compiling cassandra-cpp-sys v0.12.0 (/opt/crater/workdir)
[INFO] [stderr] warning: unused variable: `result`
[INFO] [stderr]   --> examples/simple.rs:23:13
[INFO] [stderr]    |
[INFO] [stderr] 23 |         let result = match cass_future_error_code(connect_future) {
[INFO] [stderr]    |             ^^^^^^ help: consider prefixing with an underscore: `_result`
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(unused_variables)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `rc`
[INFO] [stderr]   --> examples/simple.rs:52:21
[INFO] [stderr]    |
[INFO] [stderr] 52 |                     rc => {
[INFO] [stderr]    |                     ^^ help: consider prefixing with an underscore: `_rc`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `rc`
[INFO] [stderr]   --> examples/simple.rs:70:13
[INFO] [stderr]    |
[INFO] [stderr] 70 |             rc => {
[INFO] [stderr]    |             ^^ help: consider prefixing with an underscore: `_rc`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `rc`
[INFO] [stderr]   --> examples/named_parameters.rs:91:13
[INFO] [stderr]    |
[INFO] [stderr] 91 |         let rc = cass_future_error_code(future);
[INFO] [stderr]    |             ^^ help: consider prefixing with an underscore: `_rc`
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(unused_variables)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `result`
[INFO] [stderr]   --> examples/named_parameters.rs:92:13
[INFO] [stderr]    |
[INFO] [stderr] 92 |         let result = match cass_future_error_code(future) {
[INFO] [stderr]    |             ^^^^^^ help: consider prefixing with an underscore: `_result`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `result`
[INFO] [stderr]    --> examples/named_parameters.rs:170:13
[INFO] [stderr]     |
[INFO] [stderr] 170 |         let result = match connect_session(session, cluster) {
[INFO] [stderr]     |             ^^^^^^ help: consider prefixing with an underscore: `_result`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `rc`
[INFO] [stderr]    --> examples/named_parameters.rs:172:13
[INFO] [stderr]     |
[INFO] [stderr] 172 |             rc => {
[INFO] [stderr]     |             ^^ help: consider prefixing with an underscore: `_rc`
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `rc`
[INFO] [stderr]   --> examples/ssl.rs:92:21
[INFO] [stderr]    |
[INFO] [stderr] 92 |                     rc => {
[INFO] [stderr]    |                     ^^ help: consider prefixing with an underscore: `_rc`
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(unused_variables)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: variable does not need to be mutable
[INFO] [stderr]   --> examples/async.rs:54:13
[INFO] [stderr]    |
[INFO] [stderr] 54 |         let mut cluster = create_cluster();
[INFO] [stderr]    |             ----^^^^^^^
[INFO] [stderr]    |             |
[INFO] [stderr]    |             help: remove this `mut`
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(unused_mut)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `rc`
[INFO] [stderr]   --> examples/tuple.rs:36:13
[INFO] [stderr]    |
[INFO] [stderr] 36 |         let rc = cass_future_error_code(future);
[INFO] [stderr]    |             ^^ help: consider prefixing with an underscore: `_rc`
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(unused_variables)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `rc`
[INFO] [stderr]   --> examples/tuple.rs:39:13
[INFO] [stderr]    |
[INFO] [stderr] 39 |             rc => print_error(future),
[INFO] [stderr]    |             ^^ help: consider prefixing with an underscore: `_rc`
[INFO] [stderr] 
[INFO] [stderr] warning: variable does not need to be mutable
[INFO] [stderr]    --> examples/tuple.rs:123:13
[INFO] [stderr]     |
[INFO] [stderr] 123 |         let mut session = &mut *cass_session_new();
[INFO] [stderr]     |             ----^^^^^^^
[INFO] [stderr]     |             |
[INFO] [stderr]     |             help: remove this `mut`
[INFO] [stderr]     |
[INFO] [stderr]     = note: `#[warn(unused_mut)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `result`
[INFO] [stderr]   --> examples/maps.rs:36:13
[INFO] [stderr]    |
[INFO] [stderr] 36 |         let result = match cass_future_error_code(future) {
[INFO] [stderr]    |             ^^^^^^ help: consider prefixing with an underscore: `_result`
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(unused_variables)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `select_from_maps`
[INFO] [stderr]   --> examples/maps.rs:51:1
[INFO] [stderr]    |
[INFO] [stderr] 51 | fn select_from_maps(session: &mut CassSession, key: &str) -> Result<(), CassError> {
[INFO] [stderr]    | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(dead_code)]` on by default
[INFO] [stderr] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 6.82s
[INFO] running `"docker" "inspect" "1912bc7ce8867e0c8c0ea89e7d787ed44f17c42c09156b6bdd4dae85e660ffa9"`
[INFO] running `"docker" "rm" "-f" "1912bc7ce8867e0c8c0ea89e7d787ed44f17c42c09156b6bdd4dae85e660ffa9"`
[INFO] [stdout] 1912bc7ce8867e0c8c0ea89e7d787ed44f17c42c09156b6bdd4dae85e660ffa9