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=== tests/cases/compiler/inheritedFunctionAssignmentCompatibility.ts ===
interface IResultCallback extends Function { }
function fn(cb: IResultCallback) { }
>fn : (cb: IResultCallback) => void
>cb : IResultCallback
fn((a, b) => true);
>fn((a, b) => true) : void
>fn : (cb: IResultCallback) => void
>(a, b) => true : (a: any, b: any) => boolean
>a : any
>b : any
>true : true
fn(function (a, b) { return true; })
>fn(function (a, b) { return true; }) : void
>fn : (cb: IResultCallback) => void
>function (a, b) { return true; } : (a: any, b: any) => boolean
>a : any
>b : any
>true : true
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