tests/cases/conformance/parser/ecmascript5/IndexSignatures/parserIndexSignature8.ts(1,13): error TS1023: An index signature parameter type must be 'string' or 'number'.
tests/cases/conformance/parser/ecmascript5/IndexSignatures/parserIndexSignature8.ts(2,14): error TS1023: An index signature parameter type must be 'string' or 'number'.