diff --git a/dmd/func.c b/dmd/func.c
index be2561a2..0aa5f540 100644
--- a/dmd/func.c
+++ b/dmd/func.c
@@ -787,8 +787,6 @@ void FuncDeclaration::semantic3(Scope *sc)
 		    parameters->push(v);
 		localsymtab->insert(v);
 		v->parent = this;
-        // for llvm d
-        arg->vardecl = v;
 	    }
 	}
 
diff --git a/dmd/mtype.c b/dmd/mtype.c
index d7657e3f..fa927a84 100644
--- a/dmd/mtype.c
+++ b/dmd/mtype.c
@@ -5057,7 +5057,6 @@ Argument::Argument(unsigned storageClass, Type *type, Identifier *ident, Express
     this->ident = ident;
     this->storageClass = storageClass;
     this->defaultArg = defaultArg;
-    this->vardecl = 0;
 }
 
 Argument *Argument::syntaxCopy()
diff --git a/dmd/mtype.h b/dmd/mtype.h
index 2b39bdc5..886e2c99 100644
--- a/dmd/mtype.h
+++ b/dmd/mtype.h
@@ -674,9 +674,6 @@ struct Argument : Object
     static void argsToDecoBuffer(OutBuffer *buf, Arguments *arguments);
     static size_t dim(Arguments *arguments);
     static Argument *getNth(Arguments *arguments, size_t nth, size_t *pn = NULL);
-
-    // backend
-    VarDeclaration* vardecl;
 };
 
 extern int PTRSIZE;
diff --git a/gen/arrays.cpp b/gen/arrays.cpp
index f0541f4c..835d5eb1 100644
--- a/gen/arrays.cpp
+++ b/gen/arrays.cpp
@@ -604,6 +604,17 @@ void DtoCatArrayElement(llvm::Value* arr, Expression* exp1, Expression* exp2)
     Type* t1 = DtoDType(exp1->type);
     Type* t2 = DtoDType(exp2->type);
 
+    // handle reverse case
+    if (t2->next && t1 == DtoDType(t2->next))
+    {
+        Type* tmp = t1;
+        t1 = t2;
+        t2 = tmp;
+        Expression* e = exp1;
+        exp1 = exp2;
+        exp2 = e;
+    }
+
     assert(t1->ty == Tarray);
     assert(t2 == DtoDType(t1->next));
 
@@ -778,7 +789,7 @@ llvm::Value* DtoDynArrayIs(TOK op, llvm::Value* l, llvm::Value* r)
 
     if (r == NULL) {
         llvm::Value* ll = gIR->ir->CreateLoad(DtoGEPi(l, 0,0, "tmp"),"tmp");
-        llvm::Value* rl = DtoConstSize_t(0);
+        llvm::Value* rl = llvm::Constant::getNullValue(ll->getType());//DtoConstSize_t(0);
         llvm::Value* b1 = gIR->ir->CreateICmp(pred,ll,rl,"tmp");
 
         llvm::Value* lp = gIR->ir->CreateLoad(DtoGEPi(l, 0,1, "tmp"),"tmp");
diff --git a/gen/functions.cpp b/gen/functions.cpp
index 6112949c..c705cba3 100644
--- a/gen/functions.cpp
+++ b/gen/functions.cpp
@@ -28,8 +28,13 @@ const llvm::FunctionType* DtoFunctionType(Type* type, const llvm::Type* thistype
     }
 
     bool typesafeVararg = false;
-    if (f->linkage == LINKd && f->varargs == 1) {
-        typesafeVararg = true;
+    bool arrayVararg = false;
+    if (f->linkage == LINKd)
+    {
+        if (f->varargs == 1)
+            typesafeVararg = true;
+        else if (f->varargs == 2)
+            arrayVararg = true;
     }
 
     // return value type
@@ -82,6 +87,10 @@ const llvm::FunctionType* DtoFunctionType(Type* type, const llvm::Type* thistype
         paramvec.push_back(getPtrToType(t1));
         paramvec.push_back(getPtrToType(llvm::Type::Int8Ty));
     }
+    else if (arrayVararg)
+    {
+        // do nothing?
+    }
 
     size_t n = Argument::dim(f->parameters);
 
@@ -120,7 +129,7 @@ const llvm::FunctionType* DtoFunctionType(Type* type, const llvm::Type* thistype
     }
 
     // construct function type
-    bool isvararg = !typesafeVararg && f->varargs;
+    bool isvararg = !(typesafeVararg || arrayVararg) && f->varargs;
     llvm::FunctionType* functype = llvm::FunctionType::get(actualRettype, paramvec, isvararg);
 
     f->llvmRetInPtr = retinptr;
@@ -383,51 +392,49 @@ void DtoDeclareFunction(FuncDeclaration* fdecl)
         gIR->dtors.push_back(fdecl);
     }
 
-    // name parameters
-    llvm::Function::arg_iterator iarg = func->arg_begin();
-    int k = 0;
-    if (f->llvmRetInPtr) {
-        iarg->setName("retval");
-        gIR->irDsymbol[fdecl].irFunc->retArg = iarg;
-        ++iarg;
-    }
-    if (f->llvmUsesThis) {
-        iarg->setName("this");
-        gIR->irDsymbol[fdecl].irFunc->thisVar = iarg;
-        assert(gIR->irDsymbol[fdecl].irFunc->thisVar);
-        ++iarg;
-    }
-
-    if (f->linkage == LINKd && f->varargs == 1) {
-        iarg->setName("_arguments");
-        gIR->irDsymbol[fdecl].irFunc->_arguments = iarg;
-        ++iarg;
-        iarg->setName("_argptr");
-        gIR->irDsymbol[fdecl].irFunc->_argptr = iarg;
-        ++iarg;
-    }
-
-    for (; iarg != func->arg_end(); ++iarg)
+    // we never reference parameters of function prototypes
+    if (!declareOnly)
     {
-        Argument* arg = Argument::getNth(f->parameters, k++);
-        //arg->llvmValue = iarg;
-        //Logger::println("identifier: '%s' %p\n", arg->ident->toChars(), arg->ident);
-        if (arg && arg->ident != 0) {
-            if (arg->vardecl) {
-                if (gIR->irDsymbol[arg->vardecl].irLocal)
-                {
-                    Logger::cout() << "WTF!?!: " << *gIR->irDsymbol[arg->vardecl].irLocal->value << '\n';
-                }
-                assert(!gIR->irDsymbol[arg->vardecl].irLocal);
-                assert(!gIR->irDsymbol[arg->vardecl].irGlobal);
-                assert(!gIR->irDsymbol[arg->vardecl].irField);
-                gIR->irDsymbol[arg->vardecl].irLocal = new IrLocal(arg->vardecl);
-                gIR->irDsymbol[arg->vardecl].irLocal->value = iarg;
-            }
-            iarg->setName(arg->ident->toChars());
+        // name parameters
+        llvm::Function::arg_iterator iarg = func->arg_begin();
+        int k = 0;
+        if (f->llvmRetInPtr) {
+            iarg->setName("retval");
+            gIR->irDsymbol[fdecl].irFunc->retArg = iarg;
+            ++iarg;
         }
-        else {
-            iarg->setName("unnamed");
+        if (f->llvmUsesThis) {
+            iarg->setName("this");
+            gIR->irDsymbol[fdecl].irFunc->thisVar = iarg;
+            assert(gIR->irDsymbol[fdecl].irFunc->thisVar);
+            ++iarg;
+        }
+
+        if (f->linkage == LINKd && f->varargs == 1) {
+            iarg->setName("_arguments");
+            gIR->irDsymbol[fdecl].irFunc->_arguments = iarg;
+            ++iarg;
+            iarg->setName("_argptr");
+            gIR->irDsymbol[fdecl].irFunc->_argptr = iarg;
+            ++iarg;
+        }
+
+        for (; iarg != func->arg_end(); ++iarg)
+        {
+            if (fdecl->parameters && fdecl->parameters->dim > k)
+            {
+                Dsymbol* argsym = (Dsymbol*)fdecl->parameters->data[k++];
+                VarDeclaration* argvd = argsym->isVarDeclaration();
+                assert(argvd);
+                assert(!gIR->irDsymbol[argvd].irLocal);
+                gIR->irDsymbol[argvd].irLocal = new IrLocal(argvd);
+                gIR->irDsymbol[argvd].irLocal->value = iarg;
+                iarg->setName(argvd->ident->toChars());
+            }
+            else
+            {
+                iarg->setName("unnamed");
+            }
         }
     }
 
@@ -500,25 +507,28 @@ void DtoDefineFunc(FuncDeclaration* fd)
                 }
 
                 // give arguments storage
-                size_t n = Argument::dim(f->parameters);
-                for (int i=0; i < n; ++i) {
-                    Argument* arg = Argument::getNth(f->parameters, i);
-                    if (arg && arg->vardecl) {
-                        VarDeclaration* vd = arg->vardecl;
+                if (fd->parameters)
+                {
+                    size_t n = fd->parameters->dim;
+                    for (int i=0; i < n; ++i)
+                    {
+                        Dsymbol* argsym = (Dsymbol*)fd->parameters->data[i];
+                        VarDeclaration* vd = argsym->isVarDeclaration();
+                        assert(vd);
+
                         if (!vd->needsStorage || vd->nestedref || vd->isRef() || vd->isOut() || DtoIsPassedByRef(vd->type))
                             continue;
+
                         llvm::Value* a = gIR->irDsymbol[vd].irLocal->value;
                         assert(a);
                         std::string s(a->getName());
                         Logger::println("giving argument '%s' storage", s.c_str());
                         s.append("_storage");
+
                         llvm::Value* v = new llvm::AllocaInst(a->getType(),s,allocaPoint);
                         gIR->ir->CreateStore(a,v);
                         gIR->irDsymbol[vd].irLocal->value = v;
                     }
-                    else {
-                        Logger::attention(fd->loc, "some unknown argument: %s", arg ? arg->toChars() : 0);
-                    }
                 }
 
                 // debug info
diff --git a/gen/toir.cpp b/gen/toir.cpp
index ff5d70e0..10de5fa6 100644
--- a/gen/toir.cpp
+++ b/gen/toir.cpp
@@ -253,6 +253,7 @@ DValue* VarExp::toElem(IRState* p)
         assert(sdecltype->ty == Tstruct);
         TypeStruct* ts = (TypeStruct*)sdecltype;
         assert(ts->sym);
+        DtoForceConstInitDsymbol(ts->sym);
         assert(gIR->irDsymbol[ts->sym].irStruct->init);
         return new DVarValue(type, gIR->irDsymbol[ts->sym].irStruct->init, true);
     }
@@ -2291,6 +2292,15 @@ DValue* IdentityExp::toElem(IRState* p)
         }
         eval = DtoDynArrayIs(op,l,r);
     }
+    else if (t1->ty == Tdelegate) {
+        if (v->isNull()) {
+            r = NULL;
+        }
+        else {
+            assert(l->getType() == r->getType());
+        }
+        eval = DtoDynArrayIs(op,l,r);
+    }
     else if (t1->isfloating())
     {
         llvm::FCmpInst::Predicate pred = (op == TOKidentity) ? llvm::FCmpInst::FCMP_OEQ : llvm::FCmpInst::FCMP_ONE;
diff --git a/llvmdc.kdevelop.filelist b/llvmdc.kdevelop.filelist
index f550c48e..2c545b01 100644
--- a/llvmdc.kdevelop.filelist
+++ b/llvmdc.kdevelop.filelist
@@ -753,6 +753,7 @@ tangotests/constructors.d
 tangotests/d.d
 tangotests/e.d
 tangotests/f.d
+tangotests/files1.d
 tangotests/g.d
 tangotests/h.d
 tangotests/i.d
@@ -768,6 +769,7 @@ tangotests/r.d
 tangotests/s.d
 tangotests/stdout1.d
 tangotests/t.d
+tangotests/vararg1.d
 test
 test/a.d
 test/aa1.d
diff --git a/tangotests/files1.d b/tangotests/files1.d
new file mode 100644
index 00000000..3bc88df0
--- /dev/null
+++ b/tangotests/files1.d
@@ -0,0 +1,12 @@
+module tangotests.files1;
+
+//import tango.io.Stdout;
+import tango.io.File;
+
+void main()
+{
+    auto file = new File("files1.output");
+    char[] str = "hello world from files1 test\n";
+    void[] data = cast(void[])str;
+    file.write(str);
+}