fixes #22297; return in the finally in the closure iterators (#22300)

ref #22297; return in the finally in the closure iterators

(cherry picked from commit b02c1dd6ca)

compiler/closureiters.nim

@@ -852,7 +852,9 @@ proc transformReturnsInTry(ctx: var Ctx, n: PNode): PNode =
   case n.kind
   of nkReturnStmt:
     # We're somewhere in try, transform to finally unrolling
-    assert(ctx.nearestFinally != 0)
+    if ctx.nearestFinally == 0:
+      # return is within the finally
+      return
 
     result = newNodeI(nkStmtList, n.info)
 

tests/closure/tclosure.nim

@@ -491,3 +491,14 @@ block tnoclosure:
       row = zip(row & @[0], @[0] & row).mapIt(it[0] + it[1])
     echo row
   pascal(10)
+
+block: # bug #22297
+  iterator f: int {.closure.} =
+    try:
+      yield 12
+    finally:
+      return 14
+
+  let s = f
+  doAssert s() == 12
+  doAssert s() == 14