//@filename: file.tsx
//@jsx: preserve
declare module JSX {
	interface Element { }
	interface IntrinsicElements {
		test1: Attribs1;
	}
}
interface Attribs1 {
	x(n: string): void;
}

// OK
<test1 {... {x: (n) => 0} } />;

// Error, no member 'len' on 'string'
<test1 {... {x: (n) => n.len} } />;