{"ast_node_type":"function","tokens":[{"end":55,"kind":"keyword","start":0,"text":"fn"}]}
fn try_extract_error_from_region_constraints<'a, 'tcx>(
#[instrument(level = "debug", skip(infcx, region_var_origin, universe_of_region))]
    infcx: &'a InferCtxt<'tcx>,