tests/cases/conformance/async/es6/functionDeclarations/asyncFunctionDeclaration15_es6.ts(6,23): error TS1064: The return type of an async function or method must be the global Promise<T> type. Did you mean to write 'Promise<{}>'?
tests/cases/conformance/async/es6/functionDeclarations/asyncFunctionDeclaration15_es6.ts(6,23): error TS2355: A function whose declared type is neither 'void' nor 'any' must return a value.
tests/cases/conformance/async/es6/functionDeclarations/asyncFunctionDeclaration15_es6.ts(7,23): error TS1064: The return type of an async function or method must be the global Promise<T> type. Did you mean to write 'Promise<any>'?
tests/cases/conformance/async/es6/functionDeclarations/asyncFunctionDeclaration15_es6.ts(8,23): error TS1064: The return type of an async function or method must be the global Promise<T> type. Did you mean to write 'Promise<number>'?
tests/cases/conformance/async/es6/functionDeclarations/asyncFunctionDeclaration15_es6.ts(8,23): error TS2355: A function whose declared type is neither 'void' nor 'any' must return a value.
tests/cases/conformance/async/es6/functionDeclarations/asyncFunctionDeclaration15_es6.ts(9,23): error TS1064: The return type of an async function or method must be the global Promise<T> type. Did you mean to write 'Promise<void>'?
tests/cases/conformance/async/es6/functionDeclarations/asyncFunctionDeclaration15_es6.ts(10,23): error TS1064: The return type of an async function or method must be the global Promise<T> type. Did you mean to write 'Promise<void>'?
tests/cases/conformance/async/es6/functionDeclarations/asyncFunctionDeclaration15_es6.ts(17,16): error TS1058: The return type of an async function must either be a valid promise or must not contain a callable 'then' member.
tests/cases/conformance/async/es6/functionDeclarations/asyncFunctionDeclaration15_es6.ts(23,25): error TS1320: Type of 'await' operand must either be a valid promise or must not contain a callable 'then' member.


==== tests/cases/conformance/async/es6/functionDeclarations/asyncFunctionDeclaration15_es6.ts (9 errors) ====
    declare class Thenable { then(): void; }
    declare let a: any;
    declare let obj: { then: string; };
    declare let thenable: Thenable;
    async function fn1() { } // valid: Promise<void>
    async function fn2(): { } { } // error
                          ~~~
!!! error TS1064: The return type of an async function or method must be the global Promise<T> type. Did you mean to write 'Promise<{}>'?
                          ~~~
!!! error TS2355: A function whose declared type is neither 'void' nor 'any' must return a value.
    async function fn3(): any { } // error
                          ~~~
!!! error TS1064: The return type of an async function or method must be the global Promise<T> type. Did you mean to write 'Promise<any>'?
    async function fn4(): number { } // error
                          ~~~~~~
!!! error TS1064: The return type of an async function or method must be the global Promise<T> type. Did you mean to write 'Promise<number>'?
                          ~~~~~~
!!! error TS2355: A function whose declared type is neither 'void' nor 'any' must return a value.
    async function fn5(): PromiseLike<void> { } // error
                          ~~~~~~~~~~~~~~~~~
!!! error TS1064: The return type of an async function or method must be the global Promise<T> type. Did you mean to write 'Promise<void>'?
    async function fn6(): Thenable { } // error
                          ~~~~~~~~
!!! error TS1064: The return type of an async function or method must be the global Promise<T> type. Did you mean to write 'Promise<void>'?
    async function fn7() { return; } // valid: Promise<void>
    async function fn8() { return 1; } // valid: Promise<number>
    async function fn9() { return null; } // valid: Promise<any>
    async function fn10() { return undefined; } // valid: Promise<any>
    async function fn11() { return a; } // valid: Promise<any>
    async function fn12() { return obj; } // valid: Promise<{ then: string; }>
    async function fn13() { return thenable; } // error
                   ~~~~
!!! error TS1058: The return type of an async function must either be a valid promise or must not contain a callable 'then' member.
    async function fn14() { await 1; } // valid: Promise<void>
    async function fn15() { await null; } // valid: Promise<void>
    async function fn16() { await undefined; } // valid: Promise<void>
    async function fn17() { await a; } // valid: Promise<void>
    async function fn18() { await obj; } // valid: Promise<void>
    async function fn19() { await thenable; } // error
                            ~~~~~~~~~~~~~~
!!! error TS1320: Type of 'await' operand must either be a valid promise or must not contain a callable 'then' member.