docs: Add defun to README

yants-tests.nix

@@ -1,54 +0,0 @@
-with (import ./yants.nix {});
-with builtins;
-
-# Note: Derivations are not included in the tests below as they cause
-# issues with deepSeq.
-
-deepSeq rec {
-  # Test that all primitive types match
-  primitives = [
-    (int 15)
-    (bool false)
-    (float 13.37)
-    (string "Hello!")
-    (function (x: x * 2))
-  ];
-
-  # Test that polymorphic types work as intended
-  poly = [
-    (option int null)
-    (list string [ "foo" "bar" ])
-    (either int float 42)
-  ];
-
-  # Test that structures work as planned.
-  person = struct "person" {
-    name = string;
-    age  = int;
-
-    contact = option (struct {
-      email = string;
-      phone = option string;
-    });
-  };
-
-  testPerson = person {
-    name = "Brynhjulf";
-    age  = 42;
-    contact.email = "brynhjulf@yants.nix";
-  };
-
-  # Test enum definitions & matching
-  colour = enum "colour" [ "red" "blue" "green" ];
-  testMatch = colour.match "red" {
-    red = "It is in fact red!";
-    blue = throw "It should not be blue!";
-    green = throw "It should not be green!";
-  };
-
-  # Test curried function definitions
-  func = defun [ string int string ]
-  (name: age: "${name} is ${toString age} years old");
-
-  testFunc = func "Brynhjulf" 42;
-} "All tests passed!\n"