add test case for getAst regression

tests/template/tgetast_typeliar.nim

@@ -0,0 +1,23 @@
+
+# just ensure this keeps compiling:
+
+import macros
+
+proc error(s: string) = quit s
+
+macro assertOrReturn*(condition: bool; message: string): typed =
+  var line = condition.lineInfo()
+  result = quote do:
+    block:
+      if not likely(`condition`):
+        error("Assertion failed: " & $(`message`) & "\n" & `line`)
+        return
+
+macro assertOrReturn*(condition: bool): typed =
+  var message = condition.toStrLit()
+  result = getAst assertOrReturn(condition, message)
+
+proc point*(size: int16): tuple[x, y: int16] =
+  # returns random point in square area with given `size`
+
+  assertOrReturn size > 0