================
@@ -320,6 +320,92 @@ bool 
clang::analyze_format_string::ParseUTF8InvalidSpecifier(
 // Methods on ArgType.
 
//===----------------------------------------------------------------------===//
 
+static bool namedTypeToLengthModifierKind(ASTContext &Ctx, QualType QT,
+                                          LengthModifier::Kind &K) {
+  for (/**/; const auto *TT = QT->getAs<TypedefType>();
+       QT = TT->getDecl()->getUnderlyingType()) {
+    const auto *TD = TT->getDecl();
+    const auto *DC = TT->getDecl()->getDeclContext();
+    bool RC = false;
+    if (Ctx.getLangOpts().C99) {
+      RC = DC->isTranslationUnit();
----------------
erichkeane wrote:

AH!  That is different, that is `getStdNamespace`, since mentioning it can 
cause the namespace to be created (which is a nonsensical thing to do).  Asking 
`isStdNamespace` is not problematic.

https://github.com/llvm/llvm-project/pull/143653
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