This issue was originally filed by @seaneagan

What steps will reproduce the problem?
1.
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What is the expected output? What do you see instead?

What version of the product are you using? On what operating system?

currently it doesn't read as nicely as other matchers:

expect(x, new isInstanceOf<int>());
expect(f, throwsA(new isInstanceOf<ExpectedError>()));

better would be:

expect(x, isA(int));
expect(f, throwsA(isA(ExpectedError)));

or even:

expect(x, int);
expect(f, throwsA(ExpectedError));

I think this is blocked on issue #10406.

Please provide any additional information below.