add test for barrier

guppy_examples/general/quantum-barrier-1.py

@@ -0,0 +1,30 @@
+import sys
+from typing import no_type_check
+
+from guppylang import guppy, qubit
+from guppylang.std.builtins import result
+from guppylang.std.quantum import h, measure
+from guppylang.std.platform import barrier
+
+@guppy
+@no_type_check
+def main() -> None:
+    q0, q1 = qubit(), qubit()
+    h(q0)
+    barrier(q0)
+    h(q0)
+    a = measure(q0)
+    b = False
+    if a:
+        h(q1)
+        b = measure(q1)
+        if b:
+            b = False
+    else:
+        b = measure(q1)
+    result("a", a)
+    result("b", b)
+
+
+if __name__ == "__main__":
+    sys.stdout.buffer.write(main.compile().to_bytes())