next steps for closure iterators

tests/controlflow/tblock1.nim

@@ -0,0 +1,18 @@
+discard """
+  file: "tblock1.nim"
+  line: 14
+  errormsg: "undeclared identifier: \'ha\'"
+"""
+# check for forward label and
+# for failure when label is not declared
+
+proc main =
+  block endLess:
+    write(stdout, "Muaahh!\N")
+    break endLess
+
+  break ha #ERROR
+
+main()
+
+

tests/controlflow/tnestif.nim

@@ -0,0 +1,24 @@
+discard """
+  file: "tnestif.nim"
+  output: "i == 2"
+"""
+# test nested ifs
+
+var
+    x, y: int
+x = 2
+if x == 0:
+    write(stdout, "i == 0")
+    if y == 0:
+        write(stdout, x)
+    else:
+        write(stdout, y)
+elif x == 1:
+    write(stdout, "i == 1")
+elif x == 2:
+    write(stdout, "i == 2")
+else:
+    write(stdout, "looks like Python")
+#OUT i == 2
+
+