tests/cases/conformance/es6/computedProperties/computedPropertyNamesDeclarationEmit4_ES5.ts(2,5): error TS1170: A computed property name in a type literal must directly refer to a built-in symbol. ==== tests/cases/conformance/es6/computedProperties/computedPropertyNamesDeclarationEmit4_ES5.ts (1 errors) ==== var v: { ["" + ""](): void; ~~~~~~~~~ !!! error TS1170: A computed property name in a type literal must directly refer to a built-in symbol. }