Function parse_recovering 

pub fn parse_recovering(
    source: &str,
    name: &str,
    options: ParseOptions,
) -> (Module, Vec<Diagnostic>)

Parse and return the module even when diagnostics were recorded.

Tooling (editor diagnostics on broken files) and recovery tests need the partial tree; parse stays the strict entry point that fails on any error. Trivia and spans remain accurate for the parts that parsed.