[clang] [clang][OpenMP] Diagnose badly-formed collapsed imperfect loop nests (#60678) (PR #101305)

[Alexey Bataev via cfe-commits]

================
@@ -7668,6 +7669,47 @@ struct LoopIterationSpace final {
   Expr *FinalCondition = nullptr;
 };
 
+class ForSubExprChecker : public RecursiveASTVisitor<ForSubExprChecker> {
+  const llvm::SmallSet<Decl *, 4> *CollapsedLoopVarDecls;
+  VarDecl *ForbiddenVar;
+  SourceRange ErrLoc;
+
+public:
+  explicit ForSubExprChecker(
+      const llvm::SmallSet<Decl *, 4> *CollapsedLoopVarDecls)
+      : CollapsedLoopVarDecls(CollapsedLoopVarDecls), ForbiddenVar(nullptr) {}
+
+  bool shouldVisitImplicitCode() const { return true; }
----------------
alexey-bataev wrote:

unused? Drop then

https://github.com/llvm/llvm-project/pull/101305