Small update to diagnostics to avoid the word yet

include/swift/AST/DiagnosticsSema.def

@@ -1779,8 +1779,8 @@ NOTE(overridden_near_match_here,none,
      "potential overridden %0 %1 here",
       (DescriptiveDeclKind, DeclName))
 ERROR(override_decl_extension,none,
-      "declarations %select{in extensions|from extensions}0 cannot "
-      "%select{override|be overridden}0 yet", (bool))
+      "overriding declarations %select{in extensions|from extensions}0 "
+      "is not supported", (bool))
 NOTE(overridden_here,none,
      "overridden declaration is here", ())
 ERROR(override_objc_type_mismatch_method,none,
@@ -2056,7 +2056,7 @@ NOTE(construct_raw_representable_from_unwrapped_value,none,
 // Derived conformances
 
 ERROR(cannot_synthesize_in_extension,none,
-      "implementation of %0 cannot be automatically synthesized in an extension yet", (Type))
+      "implementation of %0 cannot be automatically synthesized in an extension", (Type))
 
 ERROR(broken_raw_representable_requirement,none,
       "RawRepresentable protocol is broken: unexpected requirement", ())

test/attr/attr_override.swift

@@ -138,7 +138,7 @@ class B : A {
 }
 
 extension B {
-  override func overriddenInExtension() {} // expected-error{{declarations in extensions cannot override yet}}
+  override func overriddenInExtension() {} // expected-error{{overriding declarations in extensions is not supported}}
 }
 
 struct S {

test/decl/class/classes.swift

@@ -6,7 +6,7 @@ class B : A {
   func g() -> (B, B) { return (B(), B()) } // expected-error {{declaration 'g()' cannot override more than one superclass declaration}}
   override func h() -> (A, B) { return (B(), B()) } // expected-note {{'h()' previously overridden here}}
   override func h() -> (B, A) { return (B(), B()) } // expected-error {{'h()' has already been overridden}}
-  func i() {} // expected-error {{declarations from extensions cannot be overridden yet}}
+  func i() {} // expected-error {{overriding declarations from extensions is not supported}}
   override func j() -> Int { return 0 }
   func j() -> Float { return 0.0 }
   func k() -> Float { return 0.0 }

test/decl/func/static_func.swift

@@ -83,8 +83,8 @@ class C_Derived : C {
   override class func f2() {}
   class override func f3() {}
 
-  override class func ef2() {} // expected-error {{declarations from extensions cannot be overridden yet}}
-  class override func ef3() {} // expected-error {{declarations from extensions cannot be overridden yet}}
+  override class func ef2() {} // expected-error {{overriding declarations from extensions is not supported}}
+  class override func ef3() {} // expected-error {{overriding declarations from extensions is not supported}}
   override static func f7() {} // expected-error {{static method overrides a 'final' class method}}
 }
 
@@ -98,11 +98,11 @@ class C_Derived3 : C {
 }
 
 extension C_Derived {
-  override class func f4() {} // expected-error {{declarations in extensions cannot override yet}}
-  class override func f5() {} // expected-error {{declarations in extensions cannot override yet}}
+  override class func f4() {} // expected-error {{overriding declarations in extensions is not supported}}
+  class override func f5() {} // expected-error {{overriding declarations in extensions is not supported}}
 
-  override class func ef4() {} // expected-error {{declarations in extensions cannot override yet}}
-  class override func ef5() {} // expected-error {{declarations in extensions cannot override yet}}
+  override class func ef4() {} // expected-error {{overriding declarations in extensions is not supported}}
+  class override func ef5() {} // expected-error {{overriding declarations in extensions is not supported}}
 }
 
 protocol P {

test/decl/inherit/override.swift

@@ -28,8 +28,8 @@ extension A {
 class B : A { }
 
 extension B { 
-  func f1() { }  // expected-error{{declarations in extensions cannot override yet}}
-  func f2() -> B { } // expected-error{{declarations in extensions cannot override yet}}
+  func f1() { }  // expected-error{{overriding declarations in extensions is not supported}}
+  func f2() -> B { } // expected-error{{overriding declarations in extensions is not supported}}
 
   override func f3() { } // expected-error{{cannot override a non-dynamic class declaration from an extension}}
   override func f4() -> ObjCClassB { } // expected-error{{cannot override a non-dynamic class declaration from an extension}}
@@ -46,8 +46,8 @@ extension B {
   override func f3D() { }
   override func f4D() -> ObjCClassB { }
 
-  func f5() { }  // expected-error{{declarations in extensions cannot override yet}}
-  func f6() -> A { }  // expected-error{{declarations in extensions cannot override yet}}
+  func f5() { }  // expected-error{{overriding declarations in extensions is not supported}}
+  func f6() -> A { }  // expected-error{{overriding declarations in extensions is not supported}}
 
   @objc override func f7() { }
   @objc override func f8() -> ObjCClassA { }

test/decl/protocol/special/coding/class_codable_failure_diagnostics.swift

@@ -129,5 +129,5 @@ class C6 : Codable {
 // Classes cannot yet synthesize Encodable or Decodable in extensions.
 class C7 {}
 extension C7 : Codable {}
-// CHECK: error: implementation of 'Decodable' cannot be automatically synthesized in an extension yet
-// CHECK: error: implementation of 'Encodable' cannot be automatically synthesized in an extension yet
+// CHECK: error: implementation of 'Decodable' cannot be automatically synthesized in an extension
+// CHECK: error: implementation of 'Encodable' cannot be automatically synthesized in an extension

test/decl/protocol/special/coding/struct_codable_failure_diagnostics.swift

@@ -91,7 +91,7 @@ extension S6 : Codable {}
 // CHECK: note: protocol requires initializer 'init(from:)' with type 'Decodable'
 // CHECK: note: cannot automatically synthesize 'Decodable' because 'b' does not have a matching CodingKey and does not have a default value
 
-// CHECK: error: implementation of 'Decodable' cannot be automatically synthesized in an extension yet
+// CHECK: error: implementation of 'Decodable' cannot be automatically synthesized in an extension
 
 // }
 
@@ -115,6 +115,6 @@ extension S6 : Codable {}
 // CHECK: note: CodingKey case 'b2' does not match any stored properties
 // CHECK: note: CodingKey case 'c2' does not match any stored properties
 
-// CHECK: error: implementation of 'Encodable' cannot be automatically synthesized in an extension yet
+// CHECK: error: implementation of 'Encodable' cannot be automatically synthesized in an extension
 
 // }

test/decl/var/properties.swift

@@ -1126,7 +1126,7 @@ class rdar17391625derived :  rdar17391625 {
 
 extension rdar17391625derived {
   // Not a stored property, computed because it is an override.
-  override var prop: Int { // expected-error {{declarations in extensions cannot override yet}}
+  override var prop: Int { // expected-error {{overriding declarations in extensions is not supported}}
   didSet {
   }
   }