syntax_data: {"ast_node_type":"import","tokens":[{"end":75,"kind":"keyword","start":0,"text":"//"}]}
source_snippet:         // we enable "auto" ThinLTO where we use multiple codegen units and
context_before:         // hasn't asked for anything. Our next decision is whether or not
context_after:         // then do ThinLTO over those codegen units. The logic below will