[INFO] crate itsy 0.1.0 is already in cache
[INFO] extracting crate itsy 0.1.0 into work/ex/beta-1.38-1/sources/1.37.0/reg/itsy/0.1.0
[INFO] extracting crate itsy 0.1.0 into work/ex/beta-1.38-1/sources/beta-2019-08-13/reg/itsy/0.1.0
[INFO] validating manifest of itsy-0.1.0 on toolchain 1.37.0
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+1.37.0" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] validating manifest of itsy-0.1.0 on toolchain beta-2019-08-13
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+beta-2019-08-13" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] started frobbing itsy-0.1.0
[INFO] finished frobbing itsy-0.1.0
[INFO] frobbed toml for itsy-0.1.0 written to work/ex/beta-1.38-1/sources/1.37.0/reg/itsy/0.1.0/Cargo.toml
[INFO] started frobbing itsy-0.1.0
[INFO] finished frobbing itsy-0.1.0
[INFO] frobbed toml for itsy-0.1.0 written to work/ex/beta-1.38-1/sources/beta-2019-08-13/reg/itsy/0.1.0/Cargo.toml
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+1.37.0" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update"`
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+beta-2019-08-13" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update"`
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+1.37.0" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+beta-2019-08-13" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] testing itsy-0.1.0 against beta-2019-08-13 for beta-1.38-1
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/beta-1.38-1/worker-2/beta-2019-08-13:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/beta-1.38-1/sources/beta-2019-08-13/reg/itsy/0.1.0:/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=warn" "-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" "+beta-2019-08-13" "build" "--frozen"`
[INFO] [stdout] 5dbf9bdef23f1104c55e12e8584e009c15f59ecc191884525af8f1d93139d89b
[INFO] running `"docker" "start" "-a" "5dbf9bdef23f1104c55e12e8584e009c15f59ecc191884525af8f1d93139d89b"`
[INFO] [stderr]    Compiling itsy v0.1.0 (/opt/crater/workdir)
[INFO] [stderr] warning: unused doc comment
[INFO] [stderr]   --> src/util/typed_ids.rs:32:1
[INFO] [stderr]    |
[INFO] [stderr] 32 | /// Unique numeric id of a type.
[INFO] [stderr]    | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 33 | impl_typed_id!(TypeId);
[INFO] [stderr]    | ----------------------- rustdoc does not generate documentation for macro expansions
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(unused_doc_comments)]` on by default
[INFO] [stderr]    = help: to document an item produced by a macro, the macro must produce the documentation as part of its expansion
[INFO] [stderr] 
[INFO] [stderr] warning: unused doc comment
[INFO] [stderr]   --> src/util/typed_ids.rs:41:1
[INFO] [stderr]    |
[INFO] [stderr] 41 | /// Unique numeric id of a scope.
[INFO] [stderr]    | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 42 | impl_typed_id!(ScopeId);
[INFO] [stderr]    | ------------------------ rustdoc does not generate documentation for macro expansions
[INFO] [stderr]    |
[INFO] [stderr]    = help: to document an item produced by a macro, the macro must produce the documentation as part of its expansion
[INFO] [stderr] 
[INFO] [stderr] warning: unused doc comment
[INFO] [stderr]   --> src/util/typed_ids.rs:44:1
[INFO] [stderr]    |
[INFO] [stderr] 44 | /// Unique numeric id of a variable binding.
[INFO] [stderr]    | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 45 | impl_typed_id!(BindingId);
[INFO] [stderr]    | -------------------------- rustdoc does not generate documentation for macro expansions
[INFO] [stderr]    |
[INFO] [stderr]    = help: to document an item produced by a macro, the macro must produce the documentation as part of its expansion
[INFO] [stderr] 
[INFO] [stderr] warning: unused doc comment
[INFO] [stderr]   --> src/util/typed_ids.rs:47:1
[INFO] [stderr]    |
[INFO] [stderr] 47 | /// Unique numeric id of a function.
[INFO] [stderr]    | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 48 | impl_typed_id!(FunctionId);
[INFO] [stderr]    | --------------------------- rustdoc does not generate documentation for macro expansions
[INFO] [stderr]    |
[INFO] [stderr]    = help: to document an item produced by a macro, the macro must produce the documentation as part of its expansion
[INFO] [stderr] 
[INFO] [stderr] warning: cannot borrow `*self` as mutable because it is also borrowed as immutable
[INFO] [stderr]    --> src/frontend/resolver.rs:354:13
[INFO] [stderr]     |
[INFO] [stderr] 353 |             let function_type = self.scopes.function_type(function_id);
[INFO] [stderr]     |                                 ----------- immutable borrow occurs here
[INFO] [stderr] 354 |             self.resolve_block(&mut item.block, function_type.ret_type);
[INFO] [stderr]     |             ^^^^ mutable borrow occurs here     ---------------------- immutable borrow later used here
[INFO] [stderr]     |
[INFO] [stderr]     = note: `#[warn(mutable_borrow_reservation_conflict)]` on by default
[INFO] [stderr]     = warning: this borrowing pattern was not meant to be accepted, and may become a hard error in the future
[INFO] [stderr]     = note: for more information, see issue #59159 <https://github.com/rust-lang/rust/issues/59159>
[INFO] [stderr] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 10.52s
[INFO] running `"docker" "inspect" "5dbf9bdef23f1104c55e12e8584e009c15f59ecc191884525af8f1d93139d89b"`
[INFO] running `"docker" "rm" "-f" "5dbf9bdef23f1104c55e12e8584e009c15f59ecc191884525af8f1d93139d89b"`
[INFO] [stdout] 5dbf9bdef23f1104c55e12e8584e009c15f59ecc191884525af8f1d93139d89b
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/beta-1.38-1/worker-2/beta-2019-08-13:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/beta-1.38-1/sources/beta-2019-08-13/reg/itsy/0.1.0:/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=warn" "-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" "+beta-2019-08-13" "test" "--frozen" "--no-run"`
[INFO] [stdout] d7cbd3bc08ddf134671f8eca96d850ab97bd097283be1866add24572aeb224f2
[INFO] running `"docker" "start" "-a" "d7cbd3bc08ddf134671f8eca96d850ab97bd097283be1866add24572aeb224f2"`
[INFO] [stderr]    Compiling itsy v0.1.0 (/opt/crater/workdir)
[INFO] [stderr] warning: unused doc comment
[INFO] [stderr]   --> src/util/typed_ids.rs:32:1
[INFO] [stderr]    |
[INFO] [stderr] 32 | /// Unique numeric id of a type.
[INFO] [stderr]    | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 33 | impl_typed_id!(TypeId);
[INFO] [stderr]    | ----------------------- rustdoc does not generate documentation for macro expansions
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(unused_doc_comments)]` on by default
[INFO] [stderr]    = help: to document an item produced by a macro, the macro must produce the documentation as part of its expansion
[INFO] [stderr] 
[INFO] [stderr] warning: unused doc comment
[INFO] [stderr]   --> src/util/typed_ids.rs:41:1
[INFO] [stderr]    |
[INFO] [stderr] 41 | /// Unique numeric id of a scope.
[INFO] [stderr]    | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 42 | impl_typed_id!(ScopeId);
[INFO] [stderr]    | ------------------------ rustdoc does not generate documentation for macro expansions
[INFO] [stderr]    |
[INFO] [stderr]    = help: to document an item produced by a macro, the macro must produce the documentation as part of its expansion
[INFO] [stderr] 
[INFO] [stderr] warning: unused doc comment
[INFO] [stderr]   --> src/util/typed_ids.rs:44:1
[INFO] [stderr]    |
[INFO] [stderr] 44 | /// Unique numeric id of a variable binding.
[INFO] [stderr]    | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 45 | impl_typed_id!(BindingId);
[INFO] [stderr]    | -------------------------- rustdoc does not generate documentation for macro expansions
[INFO] [stderr]    |
[INFO] [stderr]    = help: to document an item produced by a macro, the macro must produce the documentation as part of its expansion
[INFO] [stderr] 
[INFO] [stderr] warning: unused doc comment
[INFO] [stderr]   --> src/util/typed_ids.rs:47:1
[INFO] [stderr]    |
[INFO] [stderr] 47 | /// Unique numeric id of a function.
[INFO] [stderr]    | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 48 | impl_typed_id!(FunctionId);
[INFO] [stderr]    | --------------------------- rustdoc does not generate documentation for macro expansions
[INFO] [stderr]    |
[INFO] [stderr]    = help: to document an item produced by a macro, the macro must produce the documentation as part of its expansion
[INFO] [stderr] 
[INFO] [stderr] warning: unused doc comment
[INFO] [stderr]   --> tests/vm.rs:24:1
[INFO] [stderr]    |
[INFO] [stderr] 24 |   /// Implement some VM methods to write values to the VM context.
[INFO] [stderr]    |   ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 25 | / extern_rust!(TestFns, Context, {
[INFO] [stderr] 26 | |     /// Pushes an i32 to the context.
[INFO] [stderr] 27 | |     fn ret_i32(vm: &mut VM, value: i32) {
[INFO] [stderr] 28 | |         vm.context().push(Box::new(value));
[INFO] [stderr] ...  |
[INFO] [stderr] 33 | |     }
[INFO] [stderr] 34 | | });
[INFO] [stderr]    | |___- rustdoc does not generate documentation for macro expansions
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(unused_doc_comments)]` on by default
[INFO] [stderr]    = help: to document an item produced by a macro, the macro must produce the documentation as part of its expansion
[INFO] [stderr] 
[INFO] [stderr] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stderr]  --> tests/vm.rs:5:27
[INFO] [stderr]   |
[INFO] [stderr] 5 | type ContextElement = Box<Any>;
[INFO] [stderr]   |                           ^^^ help: use `dyn`: `dyn Any`
[INFO] [stderr]   |
[INFO] [stderr]   = note: `#[warn(bare_trait_objects)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: cannot borrow `*self` as mutable because it is also borrowed as immutable
[INFO] [stderr]    --> src/frontend/resolver.rs:354:13
[INFO] [stderr]     |
[INFO] [stderr] 353 |             let function_type = self.scopes.function_type(function_id);
[INFO] [stderr]     |                                 ----------- immutable borrow occurs here
[INFO] [stderr] 354 |             self.resolve_block(&mut item.block, function_type.ret_type);
[INFO] [stderr]     |             ^^^^ mutable borrow occurs here     ---------------------- immutable borrow later used here
[INFO] [stderr]     |
[INFO] [stderr]     = note: `#[warn(mutable_borrow_reservation_conflict)]` on by default
[INFO] [stderr]     = warning: this borrowing pattern was not meant to be accepted, and may become a hard error in the future
[INFO] [stderr]     = note: for more information, see issue #59159 <https://github.com/rust-lang/rust/issues/59159>
[INFO] [stderr] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 4.24s
[INFO] running `"docker" "inspect" "d7cbd3bc08ddf134671f8eca96d850ab97bd097283be1866add24572aeb224f2"`
[INFO] running `"docker" "rm" "-f" "d7cbd3bc08ddf134671f8eca96d850ab97bd097283be1866add24572aeb224f2"`
[INFO] [stdout] d7cbd3bc08ddf134671f8eca96d850ab97bd097283be1866add24572aeb224f2
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/beta-1.38-1/worker-2/beta-2019-08-13:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/beta-1.38-1/sources/beta-2019-08-13/reg/itsy/0.1.0:/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=warn" "-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" "+beta-2019-08-13" "test" "--frozen"`
[INFO] [stdout] 75387dd139f66b63d687937200bbb8641c2bee59d69fd4538261ec8f6b632e05
[INFO] running `"docker" "start" "-a" "75387dd139f66b63d687937200bbb8641c2bee59d69fd4538261ec8f6b632e05"`
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 0.03s
[INFO] [stderr]      Running /opt/crater/target/debug/deps/itsy-c840c721b55d6213
[INFO] [stdout] 
[INFO] [stdout] running 0 tests
[INFO] [stdout] 
[INFO] [stdout] test result: ok. 0 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out
[INFO] [stdout] 
[INFO] [stderr]      Running /opt/crater/target/debug/deps/playground-28f2e3692191d765
[INFO] [stdout] 
[INFO] [stdout] running 0 tests
[INFO] [stdout] 
[INFO] [stdout] test result: ok. 0 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out
[INFO] [stdout] 
[INFO] [stderr]      Running /opt/crater/target/debug/deps/vm-97e6c0356a282dc6
[INFO] [stdout] 
[INFO] [stdout] running 4 tests
[INFO] [stdout] test recursion ... ok
[INFO] [stdout] test floats ... ok
[INFO] [stdout] test branching ... ok
[INFO] [stdout] test binary_op ... ok
[INFO] [stdout] 
[INFO] [stdout] test result: ok. 4 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out
[INFO] [stdout] 
[INFO] [stderr]    Doc-tests itsy
[INFO] [stdout] 
[INFO] [stdout] running 2 tests
[INFO] [stdout] test src/lib.rs - extern_rust (line 18) ... ok
[INFO] [stdout] test src/lib.rs - vm (line 181) ... ok
[INFO] [stdout] 
[INFO] [stdout] test result: ok. 2 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out
[INFO] [stdout] 
[INFO] running `"docker" "inspect" "75387dd139f66b63d687937200bbb8641c2bee59d69fd4538261ec8f6b632e05"`
[INFO] running `"docker" "rm" "-f" "75387dd139f66b63d687937200bbb8641c2bee59d69fd4538261ec8f6b632e05"`
[INFO] [stdout] 75387dd139f66b63d687937200bbb8641c2bee59d69fd4538261ec8f6b632e05