[INFO] fetching crate rust_json_parser 1.0.1...
[INFO] checking rust_json_parser-1.0.1 against try#24cd45d7714ba43afd4b8e62fb677b069b21c4a5 for pr-129543
[INFO] extracting crate rust_json_parser 1.0.1 into /workspace/builds/worker-3-tc2/source
[INFO] validating manifest of crates.io crate rust_json_parser 1.0.1 on toolchain 24cd45d7714ba43afd4b8e62fb677b069b21c4a5
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+24cd45d7714ba43afd4b8e62fb677b069b21c4a5" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[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-3-tc2/source/Cargo.toml
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+24cd45d7714ba43afd4b8e62fb677b069b21c4a5" "generate-lockfile" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Updating crates.io index
[INFO] [stderr]      Locking 11 packages to latest compatible versions
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+24cd45d7714ba43afd4b8e62fb677b069b21c4a5" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-3-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-3-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@sha256:923055f121b5182466d55868a8b05e67af8ba4a3a3f6bad814e953ca3cd3ac2a" "/opt/rustwide/cargo-home/bin/cargo" "+24cd45d7714ba43afd4b8e62fb677b069b21c4a5" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 3c63c9497a143a123a1be44e2f55f26c4f776349cfef564069020619a13736dd
[INFO] running `Command { std: "docker" "start" "-a" "3c63c9497a143a123a1be44e2f55f26c4f776349cfef564069020619a13736dd", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "3c63c9497a143a123a1be44e2f55f26c4f776349cfef564069020619a13736dd", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "3c63c9497a143a123a1be44e2f55f26c4f776349cfef564069020619a13736dd", kill_on_drop: false }`
[INFO] [stdout] 3c63c9497a143a123a1be44e2f55f26c4f776349cfef564069020619a13736dd
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-3-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-3-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@sha256:923055f121b5182466d55868a8b05e67af8ba4a3a3f6bad814e953ca3cd3ac2a" "/opt/rustwide/cargo-home/bin/cargo" "+24cd45d7714ba43afd4b8e62fb677b069b21c4a5" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 4aa3a812e3426e38ffeb6c56729192bc001d155d5996fa66c84800b4190f07c8
[INFO] running `Command { std: "docker" "start" "-a" "4aa3a812e3426e38ffeb6c56729192bc001d155d5996fa66c84800b4190f07c8", kill_on_drop: false }`
[INFO] [stderr]    Compiling serde v1.0.209
[INFO] [stderr]     Checking serde_json v1.0.127
[INFO] [stderr]     Checking 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)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[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)]` 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 a future release!
[INFO] [stdout]   = note: for more information, see issue #123748 <https://github.com/rust-lang/rust/issues/123748>
[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)]` 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 a future release!
[INFO] [stdout]   = note: for more information, see issue #123748 <https://github.com/rust-lang/rust/issues/123748>
[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)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 2 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 2 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished `dev` profile [unoptimized + debuginfo] target(s) in 3.77s
[INFO] running `Command { std: "docker" "inspect" "4aa3a812e3426e38ffeb6c56729192bc001d155d5996fa66c84800b4190f07c8", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "4aa3a812e3426e38ffeb6c56729192bc001d155d5996fa66c84800b4190f07c8", kill_on_drop: false }`
[INFO] [stdout] 4aa3a812e3426e38ffeb6c56729192bc001d155d5996fa66c84800b4190f07c8