Clash When Using Function as Template Value-Parameters?

[Vijay Nayar]

On Saturday, 26 May 2018 at 11:56:30 UTC, Vijay Nayar wrote:
> The error is:
> ```
> onlineapp.d(8): Error: function literal `__lambda6(char a)` is 
> not callable using argument types `(int)`
> onlineapp.d(8):        cannot pass argument `val` of type `int` 
> to parameter `char a`
> onlineapp.d(15): Error: template instance 
> `onlineapp.BTree!(int, int, function (char a) => a)` error 
> instantiating
> ```

Just to clarify.  In the example above, if I create a 'BTree!int' 
by itself, it's fine.  If I create a 'BTree!char' by itself, it's 
fine also.  But if I create both, even if they are created in 
different modules, the compiler seems to mix up the types of the 
function template-parameter, and tries to fit a 'char' to the 
'int' function or an 'int' to the 'char' function, depending on 
which was declared first.