[clang] [AST] Migrate away from PointerUnion::dyn_cast (NFC) (PR #124446)

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llvmbot wrote:


<!--LLVM PR SUMMARY COMMENT-->

@llvm/pr-subscribers-clang

Author: Kazu Hirata (kazutakahirata)

<details>
<summary>Changes</summary>

Note that PointerUnion::dyn_cast has been soft deprecated in
PointerUnion.h:

  // FIXME: Replace the uses of is(), get() and dyn_cast() with
  //        isa&lt;T&gt;, cast&lt;T&gt; and the llvm::dyn_cast&lt;T&gt;

Literal migration would result in dyn_cast_if_present (see the
definition of PointerUnion::dyn_cast), but this patch uses dyn_cast
because we expect Pattern to be nonnull.


---
Full diff: https://github.com/llvm/llvm-project/pull/124446.diff


1 Files Affected:

- (modified) clang/lib/AST/DeclTemplate.cpp (+1-1) 


``````````diff
diff --git a/clang/lib/AST/DeclTemplate.cpp b/clang/lib/AST/DeclTemplate.cpp
index e4cb7dcb16a456..de81bc64106f18 100644
--- a/clang/lib/AST/DeclTemplate.cpp
+++ b/clang/lib/AST/DeclTemplate.cpp
@@ -1463,7 +1463,7 @@ SourceRange 
VarTemplateSpecializationDecl::getSourceRange() const {
     assert(!Pattern.isNull() &&
            "Variable template specialization without pattern?");
     if (const auto *VTPSD =
-            Pattern.dyn_cast<VarTemplatePartialSpecializationDecl *>())
+            dyn_cast<VarTemplatePartialSpecializationDecl *>(Pattern))
       return VTPSD->getSourceRange();
     VarTemplateDecl *VTD = cast<VarTemplateDecl *>(Pattern);
     if (hasInit()) {

``````````

</details>


https://github.com/llvm/llvm-project/pull/124446
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