nix/eval-okay-getattrpos-functionargs.nix at 3731208dc120b5d12f1c5c63ec58bcdb34c42195 - nix - nordic-dev.net

nordic-dev.net/nix

mirror of https://github.com/NixOS/nix.git synced 2025-02-22 03:42:48 +00:00

Silvan Mosberger c34e96f7e0

Make function arguments retain position info

This allows querying the location of function arguments. E.g.

  builtins.unsafeGetAttrPos "x" (builtins.functionArgs ({ x }: null))

  => { column = 57; file = "/home/infinisil/src/nix/inst/test.nix"; line = 1; }

2020-04-02 05:52:52 +02:00

5 lines

156 B

Nix

Raw Blame History

 let
   fun = { foo }: {};
   pos = builtins.unsafeGetAttrPos "foo" (builtins.functionArgs fun);
 in { inherit (pos) column line; file = baseNameOf pos.file; }