=== tests/cases/compiler/doNotWidenAtObjectLiteralPropertyAssignment.ts ===
interface ITestEventInterval {
>ITestEventInterval : ITestEventInterval

    begin: number;
>begin : number
}

interface IIntervalTreeNode {
>IIntervalTreeNode : IIntervalTreeNode

    interval: ITestEventInterval;
>interval : ITestEventInterval
>ITestEventInterval : ITestEventInterval

    children?: IIntervalTreeNode[];
>children : IIntervalTreeNode[]
>IIntervalTreeNode : IIntervalTreeNode
}

var test: IIntervalTreeNode[] = [{ interval: { begin: 0 }, children: null }]; // was error here because best common type is {}
>test : IIntervalTreeNode[]
>IIntervalTreeNode : IIntervalTreeNode
>[{ interval: { begin: 0 }, children: null }] : { interval: { begin: number; }; children: null; }[]
>{ interval: { begin: 0 }, children: null } : { interval: { begin: number; }; children: null; }
>interval : { begin: number; }
>{ begin: 0 } : { begin: number; }
>begin : number
>0 : number
>children : null
>null : null