Maximum call stack size exceeded with Test.fuzz2

SSCCE:

```elm

module Example exposing (suite)

import Expect
import Fuzz
import Test exposing (..)

suite : Test
suite =
fuzz2 Fuzz.float (Fuzz.floatRange -1.0e100 1.0e100) "should not run out of stack" <|
\a b ->
Expect.fail "always fail"

```
## Expected

Test to fail

## Actual
```
elm-test 0.19.0-beta8
---------------------

Running 1 test. To reproduce these results, run: elm-test --fuzz 100 --seed 48737553166794

↓ Example
✗ should not run out of stack

This test failed because it threw an exception: "RangeError: Maximum call stack size exceeded"
```

## Notes

- This only occurs when a test fails.
- Changing `floatRange` to `float` fixes this.
- Possibly related #22