[clang] [clang] Migrate away from PointerUnion::dyn_cast (NFC) (PR #124425)

[Kazu Hirata via cfe-commits]

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@@ -1391,7 +1391,9 @@ class DeclContextLookupResult {
   const_iterator end() const { return iterator(); }
 
   bool empty() const { return Result.isNull();  }
-  bool isSingleResult() const { return Result.dyn_cast<NamedDecl*>(); }
+  bool isSingleResult() const {
+    return dyn_cast_if_present<NamedDecl *>(Result);
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kazutakahirata wrote:

Revised.

https://github.com/llvm/llvm-project/pull/124425
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