Auto merge of #105397 - matthiaskrgr:rollup-xv5imz8, r=matthiaskrgr

Rollup of 6 pull requests

Successful merges:

 - #105298 (llvm-wrapper: adapt for an LLVM API change)
 - #105358 (Add a test for #104260)
 - #105380 (add const generics ping files things for me)
 - #105382 (remove an excess `this`)
 - #105388 (rustdoc: remove redundant CSS `.import-item .stab { font-size }`)
 - #105390 (unstable-book: Add `ignore` to `abi_efiapi` example code)

Failed merges:

r? `@ghost`
`@rustbot` modify labels: rollup

1 files changed, 16 insertions, 0 deletions

diff --git a/compiler/rustc_llvm/llvm-wrapper/RustWrapper.cpp b/compiler/rustc_llvm/llvm-wrapper/RustWrapper.cpp
index 792d921c6a4..3a748f38995 100644
--- a/compiler/rustc_llvm/llvm-wrapper/RustWrapper.cpp
+++ b/compiler/rustc_llvm/llvm-wrapper/RustWrapper.cpp
@@ -17,7 +17,9 @@
 #include "llvm/Pass.h"
 #include "llvm/Bitcode/BitcodeWriter.h"
 #include "llvm/Support/Signals.h"
+#if LLVM_VERSION_LT(16, 0)
 #include "llvm/ADT/Optional.h"
+#endif
 
 #include <iostream>
 
@@ -708,7 +710,11 @@ enum class LLVMRustChecksumKind {
   SHA256,
 };
 
+#if LLVM_VERSION_LT(16, 0)
 static Optional<DIFile::ChecksumKind> fromRust(LLVMRustChecksumKind Kind) {
+#else
+static std::optional<DIFile::ChecksumKind> fromRust(LLVMRustChecksumKind Kind) {
+#endif
   switch (Kind) {
   case LLVMRustChecksumKind::None:
     return None;
@@ -787,8 +793,18 @@ extern "C" LLVMMetadataRef LLVMRustDIBuilderCreateFile(
     const char *Filename, size_t FilenameLen,
     const char *Directory, size_t DirectoryLen, LLVMRustChecksumKind CSKind,
     const char *Checksum, size_t ChecksumLen) {
+
+#if LLVM_VERSION_LT(16, 0)
   Optional<DIFile::ChecksumKind> llvmCSKind = fromRust(CSKind);
+#else
+  std::optional<DIFile::ChecksumKind> llvmCSKind = fromRust(CSKind);
+#endif
+
+#if LLVM_VERSION_LT(16, 0)
   Optional<DIFile::ChecksumInfo<StringRef>> CSInfo{};
+#else
+  std::optional<DIFile::ChecksumInfo<StringRef>> CSInfo{};
+#endif
   if (llvmCSKind)
     CSInfo.emplace(*llvmCSKind, StringRef{Checksum, ChecksumLen});
   return wrap(Builder->createFile(StringRef(Filename, FilenameLen),