Constant HARNESS_TEMPLATE 

pub const HARNESS_TEMPLATE: &'static str;

Available on crate feature code only.

The harness template that wraps user code.

The user provides fn run(input: serde_json::Value) -> serde_json::Value. The harness reads JSON from stdin, calls run(), and prints JSON to stdout.

Available to User Code

• serde_json::Value (imported at top level)
• All public items from serde_json (e.g., serde_json::json!, serde_json::Map)
• The full Rust standard library

Not Available

• External crates other than serde_json
• fn main() (provided by the harness)
• Crate-level attributes (#![...])
• Multi-file modules