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lib/trivial: add a few examples of usage of assertMsg/assertOneOf

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This commit is contained in:
Profpatsch 2018-08-06 01:36:09 +02:00
parent 320cdecd16
commit 3e45b61a99
5 changed files with 20 additions and 10 deletions
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7
lib/lists.nix
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@ -509,7 +509,8 @@ rec {
=> 3
*/
last = list:
assert list != []; elemAt list (length list - 1);
assert assertMsg (list != []) "lists.last: list must not be empty!";
elemAt list (length list - 1);
/* Return all elements but the last
@ -517,7 +518,9 @@ rec {
init [ 1 2 3 ]
=> [ 1 2 ]
*/
init = list: assert list != []; take (length list - 1) list;
init = list:
assert assertMsg (list != []) "lists.init: list must not be empty!";
take (length list - 1) list;
/* return the image of the cross product of some lists by a function