syntax_data: {"ast_node_type":"other","tokens":[{"end":70,"kind":"keyword","start":0,"text":"c.dtorck_types.retain(|&val|"}]}
source_snippet:     c.dtorck_types.retain(|&val| dtorck_types.replace(val).is_none());
context_before:     c.outlives.retain(|&val| outlives.replace(val).is_none());
context_after: }