TypeScript/tests/baselines/reference/inheritSameNamePropertiesWithDifferentOptionality.errors.txt

tests/cases/compiler/inheritSameNamePropertiesWithDifferentOptionality.ts(9,11): error TS2320: Interface 'A' cannot simultaneously extend types 'C' and 'C2'.
  Named property 'x' of types 'C' and 'C2' are not identical.


==== tests/cases/compiler/inheritSameNamePropertiesWithDifferentOptionality.ts (1 errors) ====
    interface C {
        x?: number;
    }
    
    interface C2 {
        x: number;
    }
    
    interface A extends C, C2 { // error
              ~
!!! error TS2320: Interface 'A' cannot simultaneously extend types 'C' and 'C2'.
!!! error TS2320:   Named property 'x' of types 'C' and 'C2' are not identical.
        y: string;
    }