var c2 = cDefinition.Construct(ImmutableArray.Create(TypeWithAnnotations.Create(cDefinition.TypeParameters.Single(), NullableAnnotation.NotAnnotated)));
// Construct from cDefinition with unannotated T from cDefinition
var c2 = cDefinition.Construct(ImmutableArray.Create(TypeWithAnnotations.Create(cDefinition.TypeParameters.Single(), NullableAnnotation.NotAnnotated)));
// (20,47): error CS0539: 'Outer<T>.Inner<U>.Derived4.Derived5.Method<K>(T, U[], List<U>, Dictionary<K, T>)' in explicit interface declaration is not a member of interface
// (20,47): error CS0539: 'Outer<T>.Inner<U>.Derived4.Derived5.Method<K>(T, U[], List<U>, Dictionary<K, T>)' in explicit interface declaration is not found among members of the interface that can be implemented
@@ -85642,10 +85935,7 @@ class C<CT1, CT2> : I2<CT1, CT2>,
var expected = new DiagnosticDescription[] {
// (2,7): warning CS8645: 'I1<C1<CT1, CT2>>' is already listed in the interface list on type 'C<CT1, CT2>' with different nullability of reference types.