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

[Michael V. Franklin]

On Wednesday, 15 November 2017 at 04:30:32 UTC, Walter Bright 
wrote:

> I just tried:
>
>   import core.stdc.stdio;
>   void foo(char c) { printf("char\n"); }
>   void foo(int c) { printf("int\n"); }
>   void main() {
>     enum int e = 1;
>     foo(e);
>     foo(1);
>     foo('c');
>   }
>
> and it prints:
>
>   int
>   int
>   char

The code posted was incorrect.  See 
http://forum.dlang.org/post/mailman.154.1510704335.9493.digitalmars-d@puremagic.com