=== tests/cases/conformance/statements/returnStatements/returnStatements.ts ===
// all the following should be valid
function fn1(): number { return 1; }
>fn1 : () => number, Symbol(fn1, Decl(returnStatements.ts, 0, 0))
>1 : number

function fn2(): string { return ''; }
>fn2 : () => string, Symbol(fn2, Decl(returnStatements.ts, 1, 36))
>'' : string

function fn3(): void { return undefined; }
>fn3 : () => void, Symbol(fn3, Decl(returnStatements.ts, 2, 37))
>undefined : undefined, Symbol(undefined)

function fn4(): void { return; }
>fn4 : () => void, Symbol(fn4, Decl(returnStatements.ts, 3, 42))

function fn5(): boolean { return true; }
>fn5 : () => boolean, Symbol(fn5, Decl(returnStatements.ts, 4, 32))
>true : boolean

function fn6(): Date { return new Date(12); }
>fn6 : () => Date, Symbol(fn6, Decl(returnStatements.ts, 5, 40))
>Date : Date, Symbol(Date, Decl(lib.d.ts, 633, 23), Decl(lib.d.ts, 815, 11))
>new Date(12) : Date
>Date : DateConstructor, Symbol(Date, Decl(lib.d.ts, 633, 23), Decl(lib.d.ts, 815, 11))
>12 : number

function fn7(): any { return null; }
>fn7 : () => any, Symbol(fn7, Decl(returnStatements.ts, 6, 45))
>null : null

function fn8(): any { return; } // OK, eq. to 'return undefined'
>fn8 : () => any, Symbol(fn8, Decl(returnStatements.ts, 7, 36))

interface I { id: number }
>I : I, Symbol(I, Decl(returnStatements.ts, 8, 31))
>id : number, Symbol(id, Decl(returnStatements.ts, 10, 13))

class C implements I {
>C : C, Symbol(C, Decl(returnStatements.ts, 10, 26))
>I : I, Symbol(I, Decl(returnStatements.ts, 8, 31))

    id: number;
>id : number, Symbol(id, Decl(returnStatements.ts, 11, 22))

    dispose() {}
>dispose : () => void, Symbol(dispose, Decl(returnStatements.ts, 12, 15))
}
class D extends C {
>D : D, Symbol(D, Decl(returnStatements.ts, 14, 1))
>C : C, Symbol(C, Decl(returnStatements.ts, 10, 26))

    name: string;
>name : string, Symbol(name, Decl(returnStatements.ts, 15, 19))
}
function fn10(): I { return { id: 12 }; } 
>fn10 : () => I, Symbol(fn10, Decl(returnStatements.ts, 17, 1))
>I : I, Symbol(I, Decl(returnStatements.ts, 8, 31))
>{ id: 12 } : { id: number; }
>id : number, Symbol(id, Decl(returnStatements.ts, 18, 29))
>12 : number

function fn11(): I { return new C(); }
>fn11 : () => I, Symbol(fn11, Decl(returnStatements.ts, 18, 41))
>I : I, Symbol(I, Decl(returnStatements.ts, 8, 31))
>new C() : C
>C : typeof C, Symbol(C, Decl(returnStatements.ts, 10, 26))

function fn12(): C { return new D(); }
>fn12 : () => C, Symbol(fn12, Decl(returnStatements.ts, 20, 38))
>C : C, Symbol(C, Decl(returnStatements.ts, 10, 26))
>new D() : D
>D : typeof D, Symbol(D, Decl(returnStatements.ts, 14, 1))

function fn13(): C { return null; }
>fn13 : () => C, Symbol(fn13, Decl(returnStatements.ts, 21, 38))
>C : C, Symbol(C, Decl(returnStatements.ts, 10, 26))
>null : null