tests/cases/conformance/types/typeRelationships/typeAndMemberIdentity/objectTypesIdentityWithPrivates3.ts(25,1): error TS2352: Neither type 'C3' nor type 'C4' is assignable to the other. Property 'y' is missing in type 'C3'. ==== tests/cases/conformance/types/typeRelationships/typeAndMemberIdentity/objectTypesIdentityWithPrivates3.ts (1 errors) ==== interface T1 { } interface T2 { z } class C1 { private x; } class C2 extends C1 { y; } var c1: C1; c1; // Should succeed (private x originates in the same declaration) class C3 { private x: T; // This T is the difference between C3 and C1 } class C4 extends C3 { y; } var c3: C3; c3; // Should fail (private x originates in the same declaration, but different types) ~~~~~~ !!! error TS2352: Neither type 'C3' nor type 'C4' is assignable to the other. !!! error TS2352: Property 'y' is missing in type 'C3'.