syntax_data: {"ast_node_type":"other","tokens":[{"end":68,"kind":"keyword","start":0,"text":"///"}]}
source_snippet: /// `RePlaceholder` is designed for this purpose. In these contexts,
context_before: /// yet known, so you can't just call `resolve_regions_and_report_errors`.
context_after: /// there's also the risk that some inference variable laying around will