fixes #1418

tests/controlflow/tbreak.nim

@@ -0,0 +1,33 @@
+discard """
+  output: '''10'''
+"""
+
+var
+  x = false
+  run = true
+
+while run:
+  run = false
+  block myblock:
+    if true:
+      break
+    echo "leaving myblock"
+  x = true
+doAssert(x)
+
+# bug #1418
+iterator foo: int =
+  for x in 0 .. 9:
+    for y in [10,20,30,40,50,60,70,80,90]:
+      yield x + y
+
+for p in foo():
+  echo p
+  break
+
+iterator permutations: int =
+  yield 10
+
+for p in permutations():
+  break
+