{"ast_node_type":"other","tokens":[{"end":76,"kind":"keyword","start":0,"text":"//"}]}
    // See also `src/llvm-project/clang/lib/CodeGen/CoverageMappingGen.cpp`.
    // <https://llvm.org/docs/CoverageMappingFormat.html#llvm-ir-representation>
    let covmap_header = cx.const_struct(