[clang-tidy]: Add TagDecl into LastTagDeclRanges in UseUsingCheck only when it is a definition (#67639)

Fix issue 67529, [clang-tidy: modernize-use-using fails when type is
implicitly forward
declared](https://github.com/llvm/llvm-project/issues/67529)
The problem is that using `Lexer` to get record declaration will lose
the type information when its original type is pointer or reference.
This patch fix this problem by skip adding the tag declaration when it's
only a 'declaration' and not a 'definition'.

Co-authored-by: huqizhi <836744285@qq.com>

1 files changed, 2 insertions, 1 deletions

diff --git a/clang-tools-extra/clang-tidy/modernize/UseUsingCheck.cpp b/clang-tools-extra/clang-tidy/modernize/UseUsingCheck.cpp
index 22dc9e2..e6293ed 100644
--- a/clang-tools-extra/clang-tidy/modernize/UseUsingCheck.cpp
+++ b/clang-tools-extra/clang-tidy/modernize/UseUsingCheck.cpp
@@ -61,7 +61,8 @@ void UseUsingCheck::check(const MatchFinder::MatchResult &Result) {
     // before the typedef will be the nested one (PR#50990). Therefore, we also
     // keep track of the parent declaration, so that we can look up the last
     // TagDecl that is a sibling of the typedef in the AST.
-    LastTagDeclRanges[ParentDecl] = MatchedTagDecl->getSourceRange();
+    if (MatchedTagDecl->isThisDeclarationADefinition())
+      LastTagDeclRanges[ParentDecl] = MatchedTagDecl->getSourceRange();
     return;
   }