syntax_data: {"ast_node_type":"other","tokens":[{"end":76,"kind":"keyword","start":0,"text":"//"}]}
source_snippet:                 // example `Option<u128>` can be lowered as `{ i128, i128 }`
context_before:                 // exactly the return type is lowered to an LLVM IR type. For
context_after:                 // in which case the x86_64 backend would use a return area