Function LLVMRustDIBuilderCreateFile 

pub(crate) unsafe extern "C" fn LLVMRustDIBuilderCreateFile<'a>(
    Builder: &DIBuilder<'a>,
    Filename: *const c_char,
    FilenameLen: size_t,
    Directory: *const c_char,
    DirectoryLen: size_t,
    CSKind: ChecksumKind,
    Checksum: *const c_char,
    ChecksumLen: size_t,
    Source: *const c_char,
    SourceLen: size_t,
) -> &'a Metadata

We can’t use LLVM-C’s LLVMDIBuilderCreateFileWithChecksum because it requires a checksum, but we sometimes don’t provide one.