Cursed Code

import std.stdio;
import std.traits;

alias FooFn = void function(int) nothrow;

void callFoo(FooFn fooFn)
{
    fooFn(42);
}

void foo(int x)
{
    writeln(x);
}

void bar(string s)
{
    writeln(s);
}

void main(string [] args) {
    FooFn fooFn = cast(SetFunctionAttributes!(FooFn, functionLinkage!FooFn, FunctionAttribute.nothrow_))&bar;
    callFoo(fooFn);
}