[Issue 1466] Spec claims maximal munch technique always works: not for "1..3"

[Jascha Wetzel]

d-bugmail at puremagic.com wrote:
>         // thinks it's [0 ... 1], no maximal munch taking place
>         assert (Foo[0... 1] == 0);
> }

this *is* maximal munch taking place. because of the ".." lexeme, float 
literals are not lexemes. they are context free production rules 
consisting of multiple lexemes. therefore "0." consists of two lexemes 
and "..." wins the max munch over ".".