pub unsafe extern "C" fn LLVMRustCoverageWriteMappingToBuffer(
VirtualFileMappingIDs: *const c_uint,
NumVirtualFileMappingIDs: c_uint,
Expressions: *const CounterExpression,
NumExpressions: c_uint,
MappingRegions: *const CounterMappingRegion,
NumMappingRegions: c_uint,
BufferOut: &RustString
)