[Type Checker] Check subpattern storage instead of whole pattern.

include/swift/AST/Pattern.h

@@ -163,6 +163,9 @@ class alignas(8) Pattern {
     });
   }
 
+  /// Does this binding declare something that requires storage?
+  bool hasStorage() const;
+
   static bool classof(const Pattern *P) { return true; }
 
   //*** Allocation Routines ************************************************/

lib/AST/Decl.cpp

@@ -1132,14 +1132,10 @@ StaticSpellingKind PatternBindingDecl::getCorrectStaticSpelling() const {
 bool PatternBindingDecl::hasStorage() const {
   // Walk the pattern, to check to see if any of the VarDecls included in it
   // have storage.
-  bool HasStorage = false;
   for (auto entry : getPatternList())
-    entry.getPattern()->forEachVariable([&](VarDecl *VD) {
-      if (VD->hasStorage())
-        HasStorage = true;
-    });
-
-  return HasStorage;
+    if (entry.getPattern()->hasStorage())
+      return true;
+  return false;
 }
 
 void PatternBindingDecl::setPattern(unsigned i, Pattern *P) {

lib/AST/Pattern.cpp

@@ -237,6 +237,16 @@ void Pattern::forEachNode(const std::function<void(Pattern*)> &f) {
   }
 }
 
+bool Pattern::hasStorage() const {
+  bool HasStorage = false;
+  forEachVariable([&](VarDecl *VD) {
+    if (VD->hasStorage())
+      HasStorage = true;
+  });
+
+  return HasStorage;
+}
+
 /// Return true if this is a non-resolved ExprPattern which is syntactically
 /// irrefutable.
 static bool isIrrefutableExprPattern(const ExprPattern *EP) {

lib/Sema/TypeCheckDecl.cpp

@@ -2866,7 +2866,7 @@ class DeclChecker : public DeclVisitor<DeclChecker> {
         // default-initializable. If so, do it.
         if (PBD->getPattern(i)->hasType() &&
             !PBD->getInit(i) &&
-            PBD->hasStorage() &&
+            PBD->getPattern(i)->hasStorage() &&
             !PBD->getPattern(i)->getType()->is<ErrorType>()) {
 
           // If we have a type-adjusting attribute (like ownership), apply it now.

test/decl/var/NSManaged_properties.swift

@@ -50,6 +50,9 @@ class SwiftGizmo : A {
   @NSManaged func mutableArrayValueForB() {} // expected-error {{NSManaged method cannot have a body; it must be provided at runtime}}
   @NSManaged class func mutableArrayValueForA() {} // expected-error {{@NSManaged only allowed on an instance property or method}}
 
+  // SR-1050: don't assert
+  @NSManaged var multiA, multiB, multiC : NSNumber?
+
   override init() {}
 }