update a few stray letrec examples

Technologicat · Technologicat · commit 61896ca81f6d · 2021-05-08T15:36:35.000+03:00
diff --git a/doc/dialects/lispython.md b/doc/dialects/lispython.md
@@ -46,8 +46,8 @@ def factorial(n):
 assert factorial(4) == 24
 factorial(5000)  # no crash
 
-t = letrec[((evenp, lambda x: (x == 0) or oddp(x - 1)),
-            (oddp, lambda x: (x != 0) and evenp(x - 1))) in
+t = letrec[[evenp << (lambda x: (x == 0) or oddp(x - 1)),
+            oddp << (lambda x: (x != 0) and evenp(x - 1))] in
            evenp(10000)]
 assert t is True
 
diff --git a/unpythonic/dialects/tests/test_lispython.py b/unpythonic/dialects/tests/test_lispython.py
@@ -101,8 +101,8 @@ def f(k, acc):
     #
     # With `mcpyrate` this shouldn't matter, but we're keeping the example.
     with testset("autonamed letrec lambdas, multiple-expression let body"):
-        t = letrec[((evenp, lambda x: (x == 0) or oddp(x - 1)),  # noqa: F821
-                    (oddp, lambda x:(x != 0) and evenp(x - 1))) in  # noqa: F821
+        t = letrec[[evenp << (lambda x: (x == 0) or oddp(x - 1)),  # noqa: F821
+                    oddp << (lambda x:(x != 0) and evenp(x - 1))] in  # noqa: F821
                    [local[x << evenp(100)],  # noqa: F821, multi-expression let body is a do[] environment
                     (x, evenp.__name__, oddp.__name__)]]  # noqa: F821
         test[t == (True, "evenp", "oddp")]
