fix #157: add test for infinite recursion on asm blocks

Author: hlorenzi

tests/issue157/err_infinite_recursion.asm

@@ -0,0 +1,12 @@
+#ruledef {
+  a {a} => {
+    assert(a == 0)
+    0`1
+  }
+  a {a} => {
+    1`1 @ asm {
+      a ({a}-1)
+    }
+  }
+}
+a 3 ; error: failed / note:_:6: within / error:_:8: failed / error:_:7: recursion