Another shot at fixing the issues with (constant) struct literals and their addresses. See DMD2682, #218, #324. The idea is to separate the notion of const from 'this variable can always be replaced with its initializer' in the frontend. To do that, I introduced Declaration::isSameAsInitializer, which is overridden in VarDeclaration to return false for constants that have a struct literal initializer. So {{{ const S s = S(5); void foo() { auto ps = &s; } // is no longer replaced by void foo() { auto ps = &(S(5)); } }}} To make taking the address of a struct constant with a struct-initializer outside of function scope possible, I made sure that AddrExp::optimize doesn't try to run the argument's optimization with WANTinterpret - that'd again replace the constant with a struct literal temporary.

/**
 * These functions are built-in intrinsics to the compiler.
 *
 * Copyright: Public Domain
 * License:   Public Domain
 * Authors:   David Friedman
 */
module std.stdarg;

version( GNU )
{
    private import gcc.builtins;
    alias __builtin_va_list va_list;
    alias __builtin_va_end  va_end;
    alias __builtin_va_copy va_copy;
}

template va_start(T)
{
    void va_start( out va_list ap, inout T parmn )
    {

    }
}

template va_arg(T)
{
    T va_arg( inout va_list ap )
    {
        return T.init;
    }
}