Compute mixin application constructors in the ClassElement.constructors getter.

pkg/analyzer/test/generated/compile_time_error_code_test.dart

Index: pkg/analyzer/test/generated/compile_time_error_code_test.dart
diff --git a/pkg/analyzer/test/generated/compile_time_error_code_test.dart b/pkg/analyzer/test/generated/compile_time_error_code_test.dart
index cfc2f626a02c90f30962199c809c242e234c53f9..e2124442a74b33fcd254e9f4a658ca49ac233549 100644
--- a/pkg/analyzer/test/generated/compile_time_error_code_test.dart
+++ b/pkg/analyzer/test/generated/compile_time_error_code_test.dart
@@ -1912,10 +1912,7 @@ class C = a.A with M;'''
 class M {}
 class C = bool with M;''');
     computeLibrarySourceErrors(source);
-    assertErrors(source, [
-      CompileTimeErrorCode.EXTENDS_DISALLOWED_CLASS,
-      CompileTimeErrorCode.MIXIN_HAS_NO_CONSTRUCTORS
-    ]);
+    assertErrors(source, [CompileTimeErrorCode.EXTENDS_DISALLOWED_CLASS]);
     verify([source]);
   }
 
@@ -1933,10 +1930,7 @@ class C = double with M;''');
 class M {}
 class C = int with M;''');
     computeLibrarySourceErrors(source);
-    assertErrors(source, [
-      CompileTimeErrorCode.EXTENDS_DISALLOWED_CLASS,
-      CompileTimeErrorCode.MIXIN_HAS_NO_CONSTRUCTORS
-    ]);
+    assertErrors(source, [CompileTimeErrorCode.EXTENDS_DISALLOWED_CLASS]);
     verify([source]);
   }
 
@@ -1963,10 +1957,7 @@ class C = num with M;''');
 class M {}
 class C = String with M;''');
     computeLibrarySourceErrors(source);
-    assertErrors(source, [
-      CompileTimeErrorCode.EXTENDS_DISALLOWED_CLASS,
-      CompileTimeErrorCode.MIXIN_HAS_NO_CONSTRUCTORS
-    ]);
+    assertErrors(source, [CompileTimeErrorCode.EXTENDS_DISALLOWED_CLASS]);
     verify([source]);
   }
 
@@ -5282,6 +5273,22 @@ class M2 = Object with M1;''');
     verify([source]);
   }
 
+  void test_recursiveInterfaceInheritance_mixin_superclass() {
+    // Make sure we don't get CompileTimeErrorCode.MIXIN_HAS_NO_CONSTRUCTORS in
+    // addition--that would just be confusing.
+    Source source = addSource('''
+class C = D with M;
+class D = C with M;
+class M {}
+''');
+    computeLibrarySourceErrors(source);
+    assertErrors(source, [
+      CompileTimeErrorCode.RECURSIVE_INTERFACE_INHERITANCE,
+      CompileTimeErrorCode.RECURSIVE_INTERFACE_INHERITANCE
+    ]);
+    verify([source]);
+  }
+
   void test_recursiveInterfaceInheritance_tail() {
     Source source = addSource(r'''
 abstract class A implements A {}