diff --git a/src/nasal_vm.h b/src/nasal_vm.h
index ac45233..a5f3855 100644
--- a/src/nasal_vm.h
+++ b/src/nasal_vm.h
@@ -322,6 +322,19 @@ inline void vm::o_sub() {op_calc(-);}
 inline void vm::o_mul() {op_calc(*);}
 inline void vm::o_div() {op_calc(/);}
 inline void vm::o_lnk() {
+    if (ctx.top[-1].type==vm_vec && ctx.top[0].type==vm_vec) {
+        ngc.temp = ngc.alloc(vm_vec);
+        for(auto i : ctx.top[-1].vec().elems) {
+            ngc.temp.vec().elems.push_back(i);
+        }
+        for(auto i : ctx.top[0].vec().elems) {
+            ngc.temp.vec().elems.push_back(i);
+        }
+        ctx.top[-1] = ngc.temp;
+        ngc.temp = nil;
+        --ctx.top;
+        return;
+    }
     ctx.top[-1] = ngc.newstr(ctx.top[-1].tostr()+ctx.top[0].tostr());
     --ctx.top;
 }
diff --git a/std/sort.nas b/std/sort.nas
index 109d8bd..c6ce726 100644
--- a/std/sort.nas
+++ b/std/sort.nas
@@ -45,12 +45,12 @@ var var_sort=func(){
             j-=1;
         }
         vec[i]=tmp;
-        quick_sort_core(vec,left,i-1,cmp);
-        quick_sort_core(vec,i+1,right,cmp);
+        quick_sort_core(vec,left,i-1);
+        quick_sort_core(vec,i+1,right);
         return nil;
     }
     return func(vec){
-        quick_sort_core(vec,0,size(vec)-1,cmp);
+        quick_sort_core(vec,0,size(vec)-1);
         return nil;
     }
 }();
\ No newline at end of file
diff --git a/test/quick_sort.nas b/test/quick_sort.nas
index 21b6438..aefd196 100644
--- a/test/quick_sort.nas
+++ b/test/quick_sort.nas
@@ -1,9 +1,10 @@
 import.std.sort;
 
 var vec=[];
+setsize(vec, 1e4);
 rand(time(0));
 for(var i=0;i<1e4;i+=1)
-    append(vec,int(rand()*1e5));
+    vec[i] = int(rand()*1e5);
 sort(vec);
 for(var i=1;i<1e4;i+=1) {
     if (vec[i]<vec[i-1]) {
@@ -20,7 +21,7 @@ var test=func(n){
     var ts=maketimestamp();
     ts.stamp();
     var_sort(a);
-    println("[time] ",str(n)," in ",ts.elapsedMSec()/1000," sec (value)");
+    println("[time] ",str(n)," in ",ts.elapsedMSec()/1000," sec (direct cmp)");
 
     var a=[];
     setsize(a,n);
@@ -29,7 +30,7 @@ var test=func(n){
     }
     ts.stamp();
     sort(a);
-    println("[time] ",str(n)," in ",ts.elapsedMSec()/1000," sec (lambda)");
+    println("[time] ",str(n)," in ",ts.elapsedMSec()/1000," sec (lambda cmp)");
 }
 
 for(var i=1000;i<1e6;i*=10){
diff --git a/test/sample.nas b/test/sample.nas
index 5865f17..53d2f10 100644
--- a/test/sample.nas
+++ b/test/sample.nas
@@ -245,6 +245,7 @@ var next_to_last = list1[-2];
 # concatenate vectors:
 #
 var joined_list = [1, 2, 3] ~ [4, 5, 6];
+print(joined_list, "\n");
 
 ###
 ### Now some fun examples:
diff --git a/test/scalar.nas b/test/scalar.nas
index a0bdefd..160ac38 100644
--- a/test/scalar.nas
+++ b/test/scalar.nas
@@ -228,4 +228,6 @@ for(var a=0;a<16;a+=1) {
         var temp=b;
         println("temp^=0x"~h[a]~" -> 0x",h[temp^=a]," temp&=0x"~h[a]~" -> 0x",h[temp&=a]," temp|=0x"~h[a]~" -> 0x",h[temp|=a]);
     }
-}
\ No newline at end of file
+}
+
+print([0, 1, 2]~[3, 4, 5], "\n");
\ No newline at end of file