This code:


------------------
import std.meta;

void main() {
    func!(double, int, double);
}

void func(A...)() {
    static foreach(Type; A) {{
        enum isType(T) = is(T == Type);
        alias filtered = Filter!(isType, A);
        pragma(msg, "Type: ", Type, " filtered: ", filtered);
    }}
}
------------------

Should print:

Type: double filtered: (double, double)
Type: int filtered: (int)
Type: double filtered: (double, double)


However, it prints this instead:

Type: double filtered: (double, double)
Type: int filtered: (double, double)
Type: double filtered: (double, double)


This is especially egregious since not using a double brace causes the compiler to complain that `isType` has already been defined. The double braces make the error go away but only the first implementation is used.