Getting the names of all the top-level functions in module

[Adam D Ruppe]

Here's one with param names:

----

module qwe;

struct FunctionInfo {
         string name;
         string[] paramNames;
}

enum FunctionInfo[] functionInfo(alias M) = ()
{
         FunctionInfo[] res;
         foreach(memberName; __traits(derivedMembers, M))
             static if (is(typeof(__traits(getMember, M, 
memberName)) Params == __parameters)) {
                 FunctionInfo fi = FunctionInfo(memberName);
                 foreach(idx, param; Params)
                         fi.paramNames ~= __traits(identifier, 
Params[idx .. idx + 1]);
                 res ~= fi;
             }
         return res;
}();

void main() {
         import std.stdio;
         writeln(functionInfo!qwe);
}

void foo(int a, int b){}

----


Of course the weird thing here is the need to slice the params 
tuple to get the idenfitier. I had to borrow that trick from 
Phobos but now that I know it it is very useful.

Otherwise the code is still fairly simple. Only hte one is 
expression since if it doesn't have params it doesn't trigger the 
condition and if all functions have params (even if it is an 
empty set)