Deprecate implicit `int` to `bool` conversion for integer literals

[Walter Bright]

On 11/14/2017 5:20 AM, Nick Treleaven wrote:
> An very similar problem exists for int and char overloads:
> 
> alias foo = (char c) => 1;
> alias foo = (int i) => 4;
> 
> enum int e = 7;
> static assert(foo(e) == 4); // fails

I cannot reproduce this error.