[IDE] Type check property wrappers so their USRs can be reported in cursor info

Author: ahoppen

lib/IDE/CursorInfo.cpp

@@ -50,6 +50,11 @@ void typeCheckDeclAndParentClosures(ValueDecl *VD) {
   typeCheckASTNodeAtLoc(
       TypeCheckASTNodeAtLocContext::declContext(VD->getDeclContext()),
       VD->getLoc());
+  // Type check any attached property wrappers so the annotated declaration can
+  // refer to their USRs
+  if (auto VarD = dyn_cast<VarDecl>(VD)) {
+    (void)VarD->getPropertyWrapperBackingPropertyType();
+  }
 }
 
 // MARK: - NodeFinderResults

test/SourceKit/CursorInfo/cursor_local_var_with_property_wrapper.swift

@@ -0,0 +1,9 @@
+@propertyWrapper struct State {
+    public init(initialValue value: Int)
+    public var wrappedValue: Int { get nonmutating set }
+}
+
+func loadPage() {
+  // RUN: %sourcekitd-test -req=cursor -pos=%(line + 1):14 %s -- %s
+  @State var pageListener: Int
+}