[INFO] fetching crate mech-wasm 0.0.1...
[INFO] extracting crate mech-wasm 0.0.1 into work/ex/pr-61629/sources/master#c8865d8e195813ade6b84434ac9f8850e7112d1a/reg/mech-wasm/0.0.1
[INFO] extracting crate mech-wasm 0.0.1 into work/ex/pr-61629/sources/try#e212b7d492c96d3837691ba29d32d5f468933fb8/reg/mech-wasm/0.0.1
[INFO] validating manifest of mech-wasm-0.0.1 on toolchain master#c8865d8e195813ade6b84434ac9f8850e7112d1a
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+c8865d8e195813ade6b84434ac9f8850e7112d1a-alt" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] validating manifest of mech-wasm-0.0.1 on toolchain try#e212b7d492c96d3837691ba29d32d5f468933fb8
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+e212b7d492c96d3837691ba29d32d5f468933fb8-alt" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] started frobbing mech-wasm-0.0.1
[INFO] finished frobbing mech-wasm-0.0.1
[INFO] frobbed toml for mech-wasm-0.0.1 written to work/ex/pr-61629/sources/master#c8865d8e195813ade6b84434ac9f8850e7112d1a/reg/mech-wasm/0.0.1/Cargo.toml
[INFO] started frobbing mech-wasm-0.0.1
[INFO] finished frobbing mech-wasm-0.0.1
[INFO] frobbed toml for mech-wasm-0.0.1 written to work/ex/pr-61629/sources/try#e212b7d492c96d3837691ba29d32d5f468933fb8/reg/mech-wasm/0.0.1/Cargo.toml
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+c8865d8e195813ade6b84434ac9f8850e7112d1a-alt" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update"`
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+e212b7d492c96d3837691ba29d32d5f468933fb8-alt" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update"`
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+c8865d8e195813ade6b84434ac9f8850e7112d1a-alt" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] [stderr]  Downloading crates ...
[INFO] [stderr]   Downloaded mech-syntax v0.0.1
[INFO] [stderr]   Downloaded mech-core v0.0.1
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+e212b7d492c96d3837691ba29d32d5f468933fb8-alt" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] testing mech-wasm-0.0.1 against master#c8865d8e195813ade6b84434ac9f8850e7112d1a for pr-61629
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/pr-61629/worker-1/master#c8865d8e195813ade6b84434ac9f8850e7112d1a:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/pr-61629/sources/master#c8865d8e195813ade6b84434ac9f8850e7112d1a/reg/mech-wasm/0.0.1:/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" "+c8865d8e195813ade6b84434ac9f8850e7112d1a-alt" "build" "--frozen"`
[INFO] [stdout] 987df3bba4793c45c16b06d6badc145983c8c30127d5c67aadb0c83129917c6f
[INFO] running `"docker" "start" "-a" "987df3bba4793c45c16b06d6badc145983c8c30127d5c67aadb0c83129917c6f"`
[INFO] [stderr]     Blocking waiting for file lock on package cache lock
[INFO] [stderr]    Compiling serde v1.0.92
[INFO] [stderr]    Compiling rand v0.4.6
[INFO] [stderr]    Compiling wasm-bindgen v0.2.45
[INFO] [stderr]    Compiling web-sys v0.3.22
[INFO] [stderr]    Compiling js-sys v0.3.22
[INFO] [stderr]    Compiling mech-core v0.0.1
[INFO] [stderr] error[E0502]: cannot borrow `self.store` as mutable because it is also borrowed as immutable
[INFO] [stderr]    --> /opt/crater/cargo-home/registry/src/github.com-1ecc6299db9ec823/mech-core-0.0.1/src/lib.rs:179:13
[INFO] [stderr]     |
[INFO] [stderr] 177 |         match &self.store.changes[ix] {
[INFO] [stderr]     |                ------------------ immutable borrow occurs here
[INFO] [stderr] 178 |           Change::Set{table, row, column, value} => {
[INFO] [stderr] 179 |             self.store.process_transaction(&Transaction::from_change(
[INFO] [stderr]     |             ^^^^^^^^^^ mutable borrow occurs here
[INFO] [stderr] 180 |               Change::Remove{table: *table, row: row.clone(), column: column.clone(), value: value.clone()}
[INFO] [stderr]     |                                     ------ immutable borrow later used here
[INFO] [stderr] 
[INFO] [stderr] error[E0502]: cannot borrow `self.store` as mutable because it is also borrowed as immutable
[INFO] [stderr]    --> /opt/crater/cargo-home/registry/src/github.com-1ecc6299db9ec823/mech-core-0.0.1/src/lib.rs:184:13
[INFO] [stderr]     |
[INFO] [stderr] 177 |         match &self.store.changes[ix] {
[INFO] [stderr]     |                ------------------ immutable borrow occurs here
[INFO] [stderr] ...
[INFO] [stderr] 184 |             self.store.process_transaction(&Transaction::from_change(
[INFO] [stderr]     |             ^^^^^^^^^^ mutable borrow occurs here
[INFO] [stderr] 185 |               Change::Set{table: *table, row: row.clone(), column: column.clone(), value: value.clone()}
[INFO] [stderr]     |                                  ------ immutable borrow later used here
[INFO] [stderr] 
[INFO] [stderr] error: aborting due to 2 previous errors
[INFO] [stderr] 
[INFO] [stderr] For more information about this error, try `rustc --explain E0502`.
[INFO] [stderr] error: Could not compile `mech-core`.
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[INFO] [stderr] error: build failed
[INFO] running `"docker" "inspect" "987df3bba4793c45c16b06d6badc145983c8c30127d5c67aadb0c83129917c6f"`
[INFO] running `"docker" "rm" "-f" "987df3bba4793c45c16b06d6badc145983c8c30127d5c67aadb0c83129917c6f"`
[INFO] [stdout] 987df3bba4793c45c16b06d6badc145983c8c30127d5c67aadb0c83129917c6f