syntax_data: {"ast_node_type":"variable","tokens":[{"end":85,"kind":"keyword","start":0,"text":"let"}]}
source_snippet:                 let tail = tcx.struct_tail_for_codegen(arg.layout.ty, cx.typing_env);
context_before:                 // Also, must not be `extern` type.
context_after:                 if matches!(tail.kind(), ty::Foreign(..)) {