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[async] Cannot read property 'members' of undefined #3978

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@nippur72

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@nippur72

when compiling this code for ES5 (not ES6)

async function f() {
   return { };  
}

instead of giving the "only available in ES6" warning, it throws this exception:

               throw e;
                     ^
TypeError: Cannot read property 'members' of undefined
   at resolveDeclaredMembers (C:\Users\Nino\AppData\Roaming\npm\node_modules\typescript\bin\tsc.js:15429:65)
   at resolveTypeReferenceMembers (C:\Users\Nino\AppData\Roaming\npm\node_modules\typescript\bin\tsc.js:15459:26)
   at resolveStructuredTypeMembers (C:\Users\Nino\AppData\Roaming\npm\node_modules\typescript\bin\tsc.js:15665:21)
   at getPropertiesOfObjectType (C:\Users\Nino\AppData\Roaming\npm\node_modules\typescript\bin\tsc.js:15673:24)
   at propertiesRelatedTo (C:\Users\Nino\AppData\Roaming\npm\node_modules\typescript\bin\tsc.js:17141:34)
   at objectTypeRelatedTo (C:\Users\Nino\AppData\Roaming\npm\node_modules\typescript\bin\tsc.js:17107:30)
   at isRelatedTo (C:\Users\Nino\AppData\Roaming\npm\node_modules\typescript\bin\tsc.js:16935:34)
   at checkTypeRelatedTo (C:\Users\Nino\AppData\Roaming\npm\node_modules\typescript\bin\tsc.js:16824:26)
   at checkTypeAssignableTo (C:\Users\Nino\AppData\Roaming\npm\node_modules\typescript\bin\tsc.js:16797:20)
   at isTypeAssignableTo (C:\Users\Nino\AppData\Roaming\npm\node_modules\typescript\bin\tsc.js:16791:20)

using tsc 1.5.3

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