if let Some(rest) = head.strip_prefix("ref: ").map(str::trim) {
The president, fixated on unsubstantiated claims that noncitizens are stealing US elections ahead of midterm elections that are expected to be bruising for Republicans, said on Truth Social Sunday that the Save America Act “must be done immediately” and “supersedes everything else”.
，这一点在新收录的资料中也有详细论述
context_filter='{"task.success": true}',
fn make_adder(n: int) - fn(int) - int {