Rework feature flag expectations in tests

Author: tbkka

Tests/SwiftParserTest/DeclarationTests.swift

@@ -3445,6 +3445,24 @@ final class DeclarationTests: ParserTestCase {
   }
 
   func testCoroutineAccessors() {
+    assertParse(
+      """
+      var i: Int {
+        yielding borrow {
+          yield _i
+        }
+        yielding mutate {
+          yield &_i
+        }
+      }
+      """
+    )
+  }
+
+  func testCoroutineAccessorsLegacyFormat() {
+    // `read` and `modify` syntax require experimental feature
+    // flag and always will, since that wasn't the final accepted
+    // syntax for SE-0474
     assertParse(
       """
       var irm: Int {
@@ -3467,21 +3485,15 @@ final class DeclarationTests: ParserTestCase {
         read {
           yield _i
         }
-        yielding borrow {
-          yield _i
-        }
         _modify {
           yield &_i
         }
         modify {
           yield &_i
         }
-        yielding mutate {
-          yield &_i
-        }
       }
       """,
-      experimentalFeatures: [.coroutineAccessors, .borrowAndMutateAccessors]
+      experimentalFeatures: .coroutineAccessors
     )
     assertParse(
       """
@@ -3519,6 +3531,20 @@ final class DeclarationTests: ParserTestCase {
     )
   }
 
+  func testMultipleModifiers() {
+    assertParse(
+      """
+      public struct S {
+        var v: Int {
+          __consuming consuming borrowing mutating nonmutating yielding get {
+            0
+          }
+        }
+      }
+      """
+    )
+  }
+
   func testBorrowAndMutateAccessors() {
     assertParse(
       """
@@ -3536,8 +3562,7 @@ final class DeclarationTests: ParserTestCase {
           }
         }
       }
-      """,
-      experimentalFeatures: .borrowAndMutateAccessors
+      """
     )
   }