syntax_data: {"ast_node_type":"function","tokens":[{"end":73,"kind":"keyword","start":0,"text":"RegionFolder"}]}
source_snippet:         RegionFolder { cx, current_index: ty::INNERMOST, fold_region_fn }
context_before:     pub fn new(cx: I, fold_region_fn: F) -> RegionFolder<I, F> {
context_after:     }