tests/cases/conformance/override/override8.ts(6,17): error TS4115: This parameter property must have an 'override' modifier because it overrides a member in base class 'B'.
tests/cases/conformance/override/override8.ts(18,17): error TS4115: This parameter property must have an 'override' modifier because it overrides a member in base class 'BB'.
tests/cases/conformance/override/override8.ts(24,12): error TS4114: This member must have an 'override' modifier because it overrides a member in the base class 'BB'.