tests/cases/compiler/extendsClauseAlreadySeen2.ts(4,30): error TS1172: 'extends' clause already seen. ==== tests/cases/compiler/extendsClauseAlreadySeen2.ts (1 errors) ==== class C { } class D extends C extends C { ~~~~~~~ !!! error TS1172: 'extends' clause already seen. baz() { } }