improve errors, add warnings, add some compile-time optimizations, fix variables, make sure conditionals and loops get booleans, affirm types, keep variables to a single type

lib/testing.ang

@@ -0,0 +1,25 @@
+
+NAMESPACE := ""
+
+func namespace(name: string, test: func()) {
+    NAMESPACE = name
+    test()
+}
+
+func assertEqual(a: any, b: any) {
+    if a != b {
+        write(format("assertion error: % should (but doesn't) equal %", [a, b]))
+        exit(1)
+    } else if env("DEBUG") != "" {
+        write(format("assertion success: % equals %", [a, b]))
+    }
+}
+
+func assertNotEqual(a: any, b: any) {
+    if a == b {
+        write(format("assertion error: % shouldn't (but does) equal %", [a, b]))
+        exit(1)
+    } else if env("DEBUG") != "" {
+        write(format("assertion success: % doesn't equal %", [a, b]))
+    }
+}