exits successfully lol

test/call-factorial.ssa

@@ -0,0 +1,11 @@
+function w $factorial (w %n, w %acc) {
+@start
+	jnz %n, @nz, @z
+@z
+	ret %acc
+@nz
+	%n_next =w sub %n, 1
+	%acc_next =w mul %n, %acc
+	%r =w call $factorial (w %n_next, w %acc)
+	ret %r
+}

test/tail.ssa

@@ -1,6 +1,6 @@
 function w $factorial (w %n, w %acc) {
 @start
-	jnz %n, @z, @nz
+	jnz %n, @nz, @z
 @z
 	ret %acc
 @nz