tests/cases/conformance/parser/ecmascript5/Symbols/parserES5SymbolIndexer2.ts(2,6): error TS1023: An index signature parameter type must be 'string' or 'number'.
==== tests/cases/conformance/parser/ecmascript5/Symbols/parserES5SymbolIndexer2.ts (1 errors) ====
class C {
[s: symbol]: string;
~
!!! error TS1023: An index signature parameter type must be 'string' or 'number'.
}