syntax_data: {"ast_node_type":"import","tokens":[{"end":81,"kind":"keyword","start":0,"text":"//"}]}
source_snippet:     // 1. because symbol names depend on both `def_id` and `instantiating_crate`,
context_before:     // We solve these as follows:
context_after:     // both their `CrateNum`s are stable for any given instance, so we can pick