tests/cases/conformance/parser/ecmascript6/Symbols/parserSymbolIndexer1.ts(2,6): error TS1023: An index signature parameter type must be 'string' or 'number'.


==== tests/cases/conformance/parser/ecmascript6/Symbols/parserSymbolIndexer1.ts (1 errors) ====
    interface I {
        [s: symbol]: string;
         ~
!!! error TS1023: An index signature parameter type must be 'string' or 'number'.
    }