[INFO] fetching crate rust_json_parser 1.0.1...
[INFO] testing rust_json_parser-1.0.1 against master#cdb45c87e2cd43495379f7e867e3cc15dcee9f93 for pr-145838-1
[INFO] extracting crate rust_json_parser 1.0.1 into /workspace/builds/worker-6-tc1/source
[INFO] started tweaking crates.io crate rust_json_parser 1.0.1
[INFO] finished tweaking crates.io crate rust_json_parser 1.0.1
[INFO] tweaked toml for crates.io crate rust_json_parser 1.0.1 written to /workspace/builds/worker-6-tc1/source/Cargo.toml
[INFO] validating manifest of crates.io crate rust_json_parser 1.0.1 on toolchain cdb45c87e2cd43495379f7e867e3cc15dcee9f93
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+cdb45c87e2cd43495379f7e867e3cc15dcee9f93" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+cdb45c87e2cd43495379f7e867e3cc15dcee9f93" "generate-lockfile" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Updating crates.io index
[INFO] [stderr]      Locking 10 packages to latest compatible versions
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+cdb45c87e2cd43495379f7e867e3cc15dcee9f93" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-6-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-6-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@sha256:7ad1b28ee6f5f7f699f6cf7015098d6ccdd96d6f2d78dd06228f5b4c9faf309c" "/opt/rustwide/cargo-home/bin/cargo" "+cdb45c87e2cd43495379f7e867e3cc15dcee9f93" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] b16ebff832e94eca5b1c8d20c5f3f5b99e173dbc629e65db4c394a12e17aa165
[INFO] running `Command { std: "docker" "start" "-a" "b16ebff832e94eca5b1c8d20c5f3f5b99e173dbc629e65db4c394a12e17aa165", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "b16ebff832e94eca5b1c8d20c5f3f5b99e173dbc629e65db4c394a12e17aa165", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "b16ebff832e94eca5b1c8d20c5f3f5b99e173dbc629e65db4c394a12e17aa165", kill_on_drop: false }`
[INFO] [stdout] b16ebff832e94eca5b1c8d20c5f3f5b99e173dbc629e65db4c394a12e17aa165
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-6-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-6-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@sha256:7ad1b28ee6f5f7f699f6cf7015098d6ccdd96d6f2d78dd06228f5b4c9faf309c" "/opt/rustwide/cargo-home/bin/cargo" "+cdb45c87e2cd43495379f7e867e3cc15dcee9f93" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 8816f0e759f0d8dbfb7a8fba11d3cc33e021a65f99192b2650ebe65c923bfef9
[INFO] running `Command { std: "docker" "start" "-a" "8816f0e759f0d8dbfb7a8fba11d3cc33e021a65f99192b2650ebe65c923bfef9", kill_on_drop: false }`
[INFO] [stderr]    Compiling serde v1.0.219
[INFO] [stderr]    Compiling serde_json v1.0.143
[INFO] [stderr]    Compiling rust_json_parser v1.0.1 (/opt/rustwide/workdir)
[INFO] [stdout] warning: unused import: `Value`
[INFO] [stdout]  --> src/lib.rs:1:39
[INFO] [stdout]   |
[INFO] [stdout] 1 | use serde_json::{from_str, to_string, Value};
[INFO] [stdout]   |                                       ^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: this function depends on never type fallback being `()`
[INFO] [stdout]  --> src/lib.rs:5:1
[INFO] [stdout]   |
[INFO] [stdout] 5 | fn parse_json_string(json_str: &str) -> Result<String, String> {
[INFO] [stdout]   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = warning: this was previously accepted by the compiler but is being phased out; it will become a hard error in Rust 2024 and in a future release in all editions!
[INFO] [stdout]   = note: for more information, see <https://doc.rust-lang.org/edition-guide/rust-2024/never-type-fallback.html>
[INFO] [stdout]   = help: specify the types explicitly
[INFO] [stdout] note: in edition 2024, the requirement `!: serde::ser::Serialize` will fail
[INFO] [stdout]  --> src/lib.rs:8:28
[INFO] [stdout]   |
[INFO] [stdout] 8 |     let result = to_string(&parsed_json).map_err(|e| format!("Failed to serialize JSON: {}", e))?;
[INFO] [stdout]   |                            ^^^^^^^^^^^^
[INFO] [stdout]   = note: `#[warn(dependency_on_unit_never_type_fallback)]` (part of `#[warn(rust_2024_compatibility)]`) on by default
[INFO] [stdout] help: use `()` annotations to avoid fallback changes
[INFO] [stdout]   |
[INFO] [stdout] 6 |     let parsed_json: () = from_str(json_str).map_err(|e| format!("Failed to parse JSON: {}", e))?;
[INFO] [stdout]   |                    ++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished `dev` profile [unoptimized + debuginfo] target(s) in 3.29s
[INFO] [stderr] warning: the following packages contain code that will be rejected by a future version of Rust: rust_json_parser v1.0.1 (/opt/rustwide/workdir)
[INFO] [stderr] note: to see what the problems were, use the option `--future-incompat-report`, or run `cargo report future-incompatibilities --id 1`
[INFO] running `Command { std: "docker" "inspect" "8816f0e759f0d8dbfb7a8fba11d3cc33e021a65f99192b2650ebe65c923bfef9", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "8816f0e759f0d8dbfb7a8fba11d3cc33e021a65f99192b2650ebe65c923bfef9", kill_on_drop: false }`
[INFO] [stdout] 8816f0e759f0d8dbfb7a8fba11d3cc33e021a65f99192b2650ebe65c923bfef9
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-6-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-6-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@sha256:7ad1b28ee6f5f7f699f6cf7015098d6ccdd96d6f2d78dd06228f5b4c9faf309c" "/opt/rustwide/cargo-home/bin/cargo" "+cdb45c87e2cd43495379f7e867e3cc15dcee9f93" "test" "--frozen" "--no-run" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] fea243ba773d084a81f3334c5a47c89b25855f2001dd367a23c5fb6b1f7e3bf0
[INFO] running `Command { std: "docker" "start" "-a" "fea243ba773d084a81f3334c5a47c89b25855f2001dd367a23c5fb6b1f7e3bf0", kill_on_drop: false }`
[INFO] [stderr]    Compiling rust_json_parser v1.0.1 (/opt/rustwide/workdir)
[INFO] [stdout] warning: unused import: `Value`
[INFO] [stdout]  --> src/lib.rs:1:39
[INFO] [stdout]   |
[INFO] [stdout] 1 | use serde_json::{from_str, to_string, Value};
[INFO] [stdout]   |                                       ^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: this function depends on never type fallback being `()`
[INFO] [stdout]  --> src/lib.rs:5:1
[INFO] [stdout]   |
[INFO] [stdout] 5 | fn parse_json_string(json_str: &str) -> Result<String, String> {
[INFO] [stdout]   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = warning: this was previously accepted by the compiler but is being phased out; it will become a hard error in Rust 2024 and in a future release in all editions!
[INFO] [stdout]   = note: for more information, see <https://doc.rust-lang.org/edition-guide/rust-2024/never-type-fallback.html>
[INFO] [stdout]   = help: specify the types explicitly
[INFO] [stdout] note: in edition 2024, the requirement `!: serde::ser::Serialize` will fail
[INFO] [stdout]  --> src/lib.rs:8:28
[INFO] [stdout]   |
[INFO] [stdout] 8 |     let result = to_string(&parsed_json).map_err(|e| format!("Failed to serialize JSON: {}", e))?;
[INFO] [stdout]   |                            ^^^^^^^^^^^^
[INFO] [stdout]   = note: `#[warn(dependency_on_unit_never_type_fallback)]` (part of `#[warn(rust_2024_compatibility)]`) on by default
[INFO] [stdout] help: use `()` annotations to avoid fallback changes
[INFO] [stdout]   |
[INFO] [stdout] 6 |     let parsed_json: () = from_str(json_str).map_err(|e| format!("Failed to parse JSON: {}", e))?;
[INFO] [stdout]   |                    ++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished `test` profile [unoptimized + debuginfo] target(s) in 0.15s
[INFO] [stderr] warning: the following packages contain code that will be rejected by a future version of Rust: rust_json_parser v1.0.1 (/opt/rustwide/workdir)
[INFO] [stderr] note: to see what the problems were, use the option `--future-incompat-report`, or run `cargo report future-incompatibilities --id 1`
[INFO] running `Command { std: "docker" "inspect" "fea243ba773d084a81f3334c5a47c89b25855f2001dd367a23c5fb6b1f7e3bf0", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "fea243ba773d084a81f3334c5a47c89b25855f2001dd367a23c5fb6b1f7e3bf0", kill_on_drop: false }`
[INFO] [stdout] fea243ba773d084a81f3334c5a47c89b25855f2001dd367a23c5fb6b1f7e3bf0
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-6-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-6-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@sha256:7ad1b28ee6f5f7f699f6cf7015098d6ccdd96d6f2d78dd06228f5b4c9faf309c" "/opt/rustwide/cargo-home/bin/cargo" "+cdb45c87e2cd43495379f7e867e3cc15dcee9f93" "test" "--frozen", kill_on_drop: false }`
[INFO] [stdout] d43f57b335a8f34f540309f386a04ffaabace33590e18a5d0ae3b968dbd5f803
[INFO] running `Command { std: "docker" "start" "-a" "d43f57b335a8f34f540309f386a04ffaabace33590e18a5d0ae3b968dbd5f803", kill_on_drop: false }`
[INFO] [stderr] warning: unused import: `Value`
[INFO] [stderr]  --> src/lib.rs:1:39
[INFO] [stderr]   |
[INFO] [stderr] 1 | use serde_json::{from_str, to_string, Value};
[INFO] [stderr]   |                                       ^^^^^
[INFO] [stderr]   |
[INFO] [stderr]   = note: `#[warn(unused_imports)]` (part of `#[warn(unused)]`) on by default
[INFO] [stderr] 
[INFO] [stderr] warning: this function depends on never type fallback being `()`
[INFO] [stderr]  --> src/lib.rs:5:1
[INFO] [stderr]   |
[INFO] [stderr] 5 | fn parse_json_string(json_str: &str) -> Result<String, String> {
[INFO] [stderr]   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]   |
[INFO] [stderr]   = warning: this was previously accepted by the compiler but is being phased out; it will become a hard error in Rust 2024 and in a future release in all editions!
[INFO] [stderr]   = note: for more information, see <https://doc.rust-lang.org/edition-guide/rust-2024/never-type-fallback.html>
[INFO] [stderr]   = help: specify the types explicitly
[INFO] [stderr] note: in edition 2024, the requirement `!: serde::ser::Serialize` will fail
[INFO] [stderr]  --> src/lib.rs:8:28
[INFO] [stderr]   |
[INFO] [stderr] 8 |     let result = to_string(&parsed_json).map_err(|e| format!("Failed to serialize JSON: {}", e))?;
[INFO] [stderr]   |                            ^^^^^^^^^^^^
[INFO] [stderr]   = note: `#[warn(dependency_on_unit_never_type_fallback)]` (part of `#[warn(rust_2024_compatibility)]`) on by default
[INFO] [stderr] help: use `()` annotations to avoid fallback changes
[INFO] [stderr]   |
[INFO] [stderr] 6 |     let parsed_json: () = from_str(json_str).map_err(|e| format!("Failed to parse JSON: {}", e))?;
[INFO] [stderr]   |                    ++++
[INFO] [stderr] 
[INFO] [stderr] warning: `rust_json_parser` (lib test) generated 2 warnings (run `cargo fix --lib -p rust_json_parser --tests` to apply 2 suggestions)
[INFO] [stderr]     Finished `test` profile [unoptimized + debuginfo] target(s) in 0.01s
[INFO] [stderr] warning: the following packages contain code that will be rejected by a future version of Rust: rust_json_parser v1.0.1 (/opt/rustwide/workdir)
[INFO] [stderr] note: to see what the problems were, use the option `--future-incompat-report`, or run `cargo report future-incompatibilities --id 1`
[INFO] [stderr]      Running unittests src/lib.rs (/opt/rustwide/target/debug/deps/mylib-2aad4d6471cf6e6f)
[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; finished in 0.00s
[INFO] [stdout] 
[INFO] running `Command { std: "docker" "inspect" "d43f57b335a8f34f540309f386a04ffaabace33590e18a5d0ae3b968dbd5f803", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "d43f57b335a8f34f540309f386a04ffaabace33590e18a5d0ae3b968dbd5f803", kill_on_drop: false }`
[INFO] [stdout] d43f57b335a8f34f540309f386a04ffaabace33590e18a5d0ae3b968dbd5f803