Merge pull request swiftlang#5500 from nkcsgexi/closure

Author: swift-ci

test/SourceKit/CodeExpand/code-expand.swift

@@ -79,3 +79,5 @@ func f1() {
   bar(a : {}}, <#T##d: () -> ()##() -> ()#>)
 }
 // CHECK: bar(a : {}}, <#T##d: () -> ()##() -> ()#>)
+
+foo(withDuration: 1, animations: <#T##() -> Void#>)

tools/SourceKit/lib/SwiftLang/SwiftEditor.cpp

@@ -1447,7 +1447,7 @@ class PlaceholderExpansionScanner {
   bool containClosure(Expr *E) {
     if (E->getStartLoc().isInvalid())
       return false;
-    EditorPlaceholderExpr *Found;
+    EditorPlaceholderExpr *Found = nullptr;
     ClosureInfo Info;
     ClosureTypeWalker ClosureWalker(SM, Info);
     PlaceholderFinder Finder(E->getStartLoc(), Found);