nac3artiq: remove errors from demo

nac3artiq/demo/demo.py

@@ -1,14 +1,12 @@
 from min_artiq import *
 from numpy import int32, int64
 
+
 @extern
 def output_int(x: int32):
     ...
 
 
-class InexistingException(Exception):
-    pass
-
 @nac3
 class Demo:
     core: KernelInvariant[Core]
@@ -20,16 +18,6 @@ class Demo:
         self.led0 = TTLOut(self.core, 18)
         self.led1 = TTLOut(self.core, 19)
 
-    @kernel
-    def test(self):
-        a = (1, True)
-        a[0]()
-
-    @kernel
-    def test2(self):
-        a = (1, True)
-        output_int(int32(a))
-
     @kernel
     def run(self):
         self.core.reset()