diff --git a/core/metaprogramming.nom b/core/metaprogramming.nom
index 67219ac..0223e17 100644
--- a/core/metaprogramming.nom
+++ b/core/metaprogramming.nom
@@ -370,9 +370,10 @@ externally (type of %) means:
 
 test:
     assume ((run "return (2 + 99)") == 101)
-    external %passed = (no)
-    run "external %passed = (yes)"
-    assume %passed
+    %x = 0
+    externally (set to %) means: external %x = %
+    run "set to 1"
+    assume %x == 1
     assume (run \(return \(\(5) + \(5)))) == 10
 (run %nomsu_code) compiles to "run_1_in(\(%nomsu_code as lua expr), _ENV)"
 [compile %block, compiled %block, %block compiled] all compile to "\
diff --git a/tools/test.nom b/tools/test.nom
index 52e548f..1fd5ee3 100755
--- a/tools/test.nom
+++ b/tools/test.nom
@@ -12,9 +12,15 @@ use "lib/consolecolor.nom"
 for %filename in (command line args).extra_args: use %filename
 %tests = {: for %s = %t in (tests): add (=lua "Source:from_string(\%s)") = %t}
 for %filename in (command line args).extra_args:
+    %file = (read file %filename)
+    %version = (%file::matching "#![^\n]* nomsu %-V[ ]*([^\n]*)")
     %file_tests = []
     for %src = %test in %tests:
         if (%src.filename == %filename):
+            if %version:
+                %test = "\
+                    ..#!/usr/bin/env nomsu -V\(%version)
+                    \%test"
             %file_tests::add {test: %test, source: %src}
     
     unless (%file_tests is empty):