This code:

import std.string;
import std.traits;

void main()
{
    isNumeric("hello world");
}


fails to compile, giving this error:

std/traits.d(2576): Error: template std.traits.isNumeric(T) is not a function template


There should be no confusion between std.string.isNumeric (which is a normal function - not even a templated function) and std.traits.isNumeric (which is an eponymous template). The syntax for each is quite distinct. There shouldn't be any confusion. One takes a variable as a function argument. The other takes a type as a templated argument.

_Worst_ case, this should complain that you need to specify which of the two isNumerics that you mean, but it should be quite clear which is meant, so ideally, it should just work with no error at all. Regardless, the error given really shouldn't be given. Either this needs to be fixed to work properly or a better error message needs to be given (similar to what occurs when you have ambiguity between overload sets).