[clang] Fix a crash introduced by 3d5e9ab by adding a nullptr check. (PR #90301)

Sun, 28 Apr 2024 00:06:41 -0700 

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@@ -54,7 +54,7 @@ class UncountedCallArgsChecker
       bool shouldVisitImplicitCode() const { return false; }
 
       bool TraverseDecl(Decl *D) {
-        if (isa<ClassTemplateDecl>(D) && isRefType(safeGetName(D)))
+        if (D && isa<ClassTemplateDecl>(D) && isRefType(safeGetName(D)))
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steakhal wrote:

Have you considered using "isa_and_nonull"?

https://github.com/llvm/llvm-project/pull/90301
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