Function parse_file 

pub fn parse_file<B: ParseBackend>(
    input: &str,
    file_id: FileId,
    backend: &B,
) -> ParseResult

Parse a single file with the given backend, using default ParseOptions.

This is a thin convenience wrapper over parse_with_backend for the common case where the caller does not need to customize parse options (Oracle 19c target, statement-boundary recovery).

A backend is supplied explicitly: this crate is the backend-independent parsing surface (R2 / R20) and intentionally has no knowledge of any concrete backend. Callers that need a zero-configuration entry point construct their chosen backend once and pass it here.

let result = parse_file("BEGIN NULL; END;", FileId::new(1), &MyBackend);
assert!(result.is_clean());