add nil as synonym for None

hy/lex/parser.py

@@ -229,6 +229,7 @@ def t_identifier(p):
     table = {
         "true": "True",
         "false": "False",
+        "nil": "None",
         "null": "None",
     }
 

tests/native_tests/language.hy

@@ -86,9 +86,10 @@
 
 (defn test-is []
   "NATIVE: test is can deal with None"
-  (setv a null)
-  (assert (is a null))
-  (assert (is-not a "b")))
+  (setv a nil)
+  (assert (is a nil))
+  (assert (is-not a "b"))
+  (assert (none? a)))
 
 
 (defn test-branching []

tests/native_tests/unless.hy

@@ -4,5 +4,7 @@
   (assert (= (unless false 1 2) 2))
   (assert (= (unless false 1 3) 3))
   (assert (= (unless true 2) null))
+  (assert (= (unless true 2) nil))
   (assert (= (unless (!= 1 2) 42) null))
+  (assert (= (unless (!= 1 2) 42) nil))
   (assert (= (unless (!= 2 2) 42) 42)))

tests/native_tests/when.hy

@@ -5,4 +5,6 @@
   (assert (= (when true 1 3) 3))
   (assert (= (when false 2) null))
   (assert (= (when (= 1 2) 42) null))
+  (assert (= (when false 2) nil))
+  (assert (= (when (= 1 2) 42) nil))
   (assert (= (when (= 2 2) 42) 42)))