Fix rdar://23681566, a bug noticed by Marcin Krzyzanowski on twitter where

we would reject an invalid @objc enum with:

<unknown>:0: error: cannot assign value of type '(progress: Int) -> Status' to type 'Status'

because we were poking at the enum element before it was validated.

Author: lattner

lib/Sema/TypeCheckDecl.cpp

@@ -2603,6 +2603,9 @@ static void checkEnumRawValues(TypeChecker &TC, EnumDecl *ED) {
   llvm::SmallDenseMap<RawValueKey, RawValueSource, 8> uniqueRawValues;
 
   for (auto elt : ED->getAllElements()) {
+    // Make sure the element is checked out before we poke at it.
+    TC.validateDecl(elt);
+    
     if (elt->isInvalid())
       continue;
 

test/Parse/objc_enum.swift

@@ -29,3 +29,9 @@ class Bar {
   @objc func foo(x: Foo) {}
   @objc func nonObjC(x: NonObjCEnum) {} //expected-error{{type of the parameter cannot be represented in Objective-C}} //expected-note{{non-'@objc' enums cannot be represented in Objective-C}}
 }
+
+// <rdar://problem/23681566> @objc enums with payloads rejected with no source location info
+@objc enum r23681566 : Int {  // expected-note {{declared raw type 'Int' here}}
+  case Foo(progress: Int)     // expected-error {{enum with raw type cannot have cases with arguments}}
+}
+

test/Parse/pointer_conversion.swift

@@ -243,6 +243,10 @@ func f23202128() {
   let pipe: [Int32] = [0, 0]  // expected-note {{change 'let' to 'var' to make it mutable}}}}
   UMP(&pipe)  // expected-error {{cannot pass immutable value as inout argument: 'pipe' is a 'let' constant}}
 
+  var pipe2: [Int] = [0, 0]
+  UMP(&pipe2) // expected-error {{cannot convert value of type '[Int]' to expected argument type 'Int32'}}
+
+  
   UP(pipe)    // ok
   UP(&pipe)   // expected-error {{'&' is not allowed passing array value as 'UnsafePointer<Int32>' argument}} {{6-7=}}
 }