diff --git a/src/alu.c b/src/alu.c
index 31e1654..9bc8a4f 100644
--- a/src/alu.c
+++ b/src/alu.c
@@ -1460,6 +1460,7 @@ static void int_handle_dyadic_operator(struct object *self, struct op *op, struc
 		self->u.number.val.intval = ((uintval_t) (self->u.number.val.intval)) >> other->u.number.val.intval;
 		break;
 	case OPID_LESSOREQUAL:
+// FIXME - all comparison results should clear all force bits and set fits_byte! also for floats!
 		self->u.number.val.intval = (self->u.number.val.intval <= other->u.number.val.intval);
 		break;
 	case OPID_LESSTHAN:
diff --git a/testing/errors/alreadydefined1.a b/testing/errors/alreadydefined1.a
new file mode 100644
index 0000000..28583ab
--- /dev/null
+++ b/testing/errors/alreadydefined1.a
@@ -0,0 +1,2 @@
+	a = 3
+	a = 3.0	; -> "already defined" (type has changed)
diff --git a/testing/errors/alreadydefined2.a b/testing/errors/alreadydefined2.a
new file mode 100644
index 0000000..23123de
--- /dev/null
+++ b/testing/errors/alreadydefined2.a
@@ -0,0 +1,2 @@
+	a = 3
+	a = 4	; -> "already defined" (value has changed)
diff --git a/testing/errors/alreadydefined3.a b/testing/errors/alreadydefined3.a
new file mode 100644
index 0000000..6daccf4
--- /dev/null
+++ b/testing/errors/alreadydefined3.a
@@ -0,0 +1,4 @@
+	*=$1000
+label
+	nop
+label	; -> already defined
diff --git a/testing/errors/toolateforpostfix1.a b/testing/errors/toolateforpostfix1.a
new file mode 100644
index 0000000..62a4ab1
--- /dev/null
+++ b/testing/errors/toolateforpostfix1.a
@@ -0,0 +1,3 @@
+	a = 3
+	b = a	; read a
+	a+2 = 3	; -> "too late for postfix"
diff --git a/testing/errors/toolateforpostfix2.a b/testing/errors/toolateforpostfix2.a
new file mode 100644
index 0000000..0ba2f8e
--- /dev/null
+++ b/testing/errors/toolateforpostfix2.a
@@ -0,0 +1,4 @@
+	*=$1000
+label
+	b = label	; read symbol
+label+2	; -> too late for postfix