basic 'lent T' test works

tests/lent/tbasic_lent_check.nim

@@ -0,0 +1,17 @@
+discard """
+  cmd: "nim c --newRuntime $file"
+  output: "1"
+"""
+
+proc viewInto(a: array[4, string]): lent string =
+  result = a[0]
+
+proc passToVar(x: var string) =
+  discard
+
+proc main =
+  let x = ["1", "2", "3", "4"]
+  echo viewInto(x)
+  doAssert(not compiles(passToVar(viewInto(x))))
+
+main()