foo : () String Float parses but gives confusing type mismatch

[rtfeldman]

I'd expect this to give me a parsing error:

foo : () String Float
foo =
    ( "foo", 3.2 )

Instead it parses and gives me a nonsensical type mismatch:

-- TYPE MISMATCH ---------------------------------------------------------------

The definition of `foo` does not match its type annotation.

 8| foo : () String Float
 9| foo =
10|>    ( "foo", 3.2 )

The type annotation for `foo` says it is a:

    ( String, Float )

But the definition (shown above) is a:

    ( String, Float )