fixes #25849; fixes #25872; Iteration on elements of array (#25860)

fixes #25849
fixes https://github.com/nim-lang/Nim/issues/25872

tests/lent/titems_array_lent.nim

@@ -0,0 +1,38 @@
+discard """
+  targets: "c cpp js"
+"""
+
+template sameAddress(a, b): bool =
+  when defined(js):
+    a == b
+  else:
+    a.unsafeAddr == b.unsafeAddr
+
+proc main() =
+  block:
+    let a = [10, 11, 12]
+    for ai in items(a):
+      doAssert sameAddress(ai, a[0])
+      break
+
+  block:
+    let a = [[1, 2], [1, 2], [1, 2]]
+    for ai in items(a):
+      doAssert sameAddress(ai[0], a[0][0])
+      break
+
+  block:
+    let s = @[(1, 2), (3, 4), (5, 6)]
+    doAssert (3, 4) in s
+
+main()
+
+static:
+  main()
+
+block: # issue #25849
+  static:
+    const key = "NIM_TESTS_TOSENV_KEY"
+    for val in ["val", "", "\xc3\x86"]:
+      let s = @[(key, "val"), (key, ""), (key, "\xc3\x86")]
+      doAssert (key, val) in s