Extract-method with namespace declaration results in invalid code

TypeScript Version: nightly (2.6.0-dev.20170916)

See test extract-method-empty-namespace.ts.

Code

function f() {
    namespace N {}
}

Extract "namespace N" out to a global function.

Expected behavior:

function f() {
    newFunction();
}
function newFunction() {
    namespace N { }
}

Actual behavior:

function f() {
    newFunction(N);
}
function newFunction(N: any) {
    namespace N { }
}

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