syntax_data: {"ast_node_type":"other","tokens":[{"end":69,"kind":"keyword","start":0,"text":"//"}]}
source_snippet:     // that all components in the projection outlive `'a`). This code
context_before:     // conservative way -- we can prove that `T: 'a` (more generally,
context_after:     // is not in a position to judge which is the best technique, so