[clang] [clang-tools-extra] [CLANGD] Do not crash on designator initialization of union (PR #83369)

[via cfe-commits]

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@@ -4601,8 +4601,15 @@ SourceRange DesignatedInitExpr::getDesignatorsSourceRange() const {
 SourceLocation DesignatedInitExpr::getBeginLoc() const {
   auto *DIE = const_cast<DesignatedInitExpr *>(this);
   Designator &First = *DIE->getDesignator(0);
-  if (First.isFieldDesignator())
-    return GNUSyntax ? First.getFieldLoc() : First.getDotLoc();
+  if (First.isFieldDesignator()) {
+    for (unsigned int i = 0; i < DIE->size(); i++) {
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alirezamoshtaghi wrote:

I ended up using EXPECT_UNAVAILABLE because it still fails for crashing case.

but when I use EXPECT_AVAILABLE, it complains as:
Expected equality of these values:
  true
  isAvailable(AST, R)
    Which is: false

    struct A {
      struct {
        int x;
      };
    };
    struct B {
      int y;
    };
    void foo(struct B *b) {
      struct A a = {.[[x]]=b->y};
    }


https://github.com/llvm/llvm-project/pull/83369