anchor.diff:    }
   }
   
  -/**
  - * A single string literal expression.
  - *
  - *    singleStringLiteral ::=
  - *        [SimpleStringLiteral]
  - *      | [StringInterpolation]
  - */
  +/// A single string literal expression.
  +///
  +///    singleStringLiteral ::=
  +///        [SimpleStringLiteral]
  +///      | [StringInterpolation]
   abstract class SingleStringLiteralImpl extends StringLiteralImpl
       implements SingleStringLiteral {}
   
  
positive.code:     _returnType = _becomeParentOf(type as TypeAnnotationImpl);
    }
  
    /**
     * Return the type parameters for the function type, or `null` if the function
     * type does not have any type parameters.
     */
    TypeParameterList get typeParameters => _typeParameters;
  
    /**
     * Set the type parameters for the function type to the given list of
     * [typeParameters].
     */
    void set typeParameters(TypeParameterList typeParameters) {
      _typeParameters = _becomeParentOf(typeParameters as TypeParameterListImpl);
    }
  
negative.code:   }
  }
  
  /// An assert in the initializer list of a constructor.
  ///
  ///    assertInitializer ::=
  ///        'assert' '(' [Expression] (',' [Expression])? ')'
  class AssertInitializerImpl extends ConstructorInitializerImpl
      implements AssertInitializer {
    @override
  