Merge pull request #14999 from nkcsgexi/fix-refactoring-crash-init-null

Author: swift-ci

lib/IDE/Refactoring.cpp

@@ -1884,8 +1884,11 @@ class ExpandableBindingTernaryExprInfo: public ExpandableTernaryExprInfo {
   Binding(Binding) {}
 
   IfExpr *getIf() {
-    if (Binding && Binding->getNumPatternEntries() == 1)
-      return dyn_cast<IfExpr>(Binding->getInit(0));
+    if (Binding && Binding->getNumPatternEntries() == 1) {
+      if (auto *Init = Binding->getInit(0)) {
+        return dyn_cast<IfExpr>(Init);
+      }
+    }
 
     return nullptr;
   }

test/refactoring/RefactoringKind/crashers.swift

@@ -5,7 +5,9 @@ func foo() {
   doit {
     let s = S()
   }
+  var a: Int
 }
 
 // RUN: %refactor -source-filename %s -pos=6:5 -end-pos=6:13 | %FileCheck %s -check-prefix=CHECK1
+// RUN: %refactor -source-filename %s -pos=8:1 -end-pos=8:13 | %FileCheck %s -check-prefix=CHECK1
 // CHECK1: Action begins