Build and compile expressions as semantic tree nodes

kerboscript_tests/integration/func.ks

@@ -4,4 +4,10 @@ function a
   print("a").
 }
 
-a().
+a().
+
+set b to {
+  print("b").
+}.
+
+b().

kerboscript_tests/integration/short_circuit.ks

@@ -0,0 +1,15 @@
+
+function a {
+  print("a").
+  return false.
+}
+
+function b {
+  print("b").
+  return true.
+}
+
+print(a() and b()).
+print(a() or b()).
+print(b() and a()).
+print(b() or a()).

src/kOS.Safe.Test/Execution/SimpleTest.cs

@@ -41,7 +41,8 @@ public void TestFunc()
             RunScript("integration/func.ks");
             RunSingleStep();
             AssertOutput(
-                "a"
+                "a",
+                "b"
             );
         }
 
@@ -116,5 +117,27 @@ public void TestSuffixes()
                 "False"
             );
         }
+
+        [Test]
+        public void TestShortCircuit()
+        {
+            // Test that boolean logic short circuits
+            RunScript("integration/short_circuit.ks");
+            RunSingleStep();
+            AssertOutput(
+                "a",
+                // short circuit away b
+                "False",
+                "a",
+                "b",
+                "True",
+                "b",
+                "a",
+                "False",
+                "b",
+                // short circuit away a
+                "True"
+            );
+        }
     }
 }