tests/cases/conformance/parser/ecmascript5/IndexSignatures/parserIndexSignature7.ts(2,3): error TS1021: An index signature must have a type annotation.


==== tests/cases/conformance/parser/ecmascript5/IndexSignatures/parserIndexSignature7.ts (1 errors) ====
    interface I {
      [a:string]
      ~~~~~~~~~~
!!! error TS1021: An index signature must have a type annotation.
    }