lix/tests/lang/eval-okay-getattrpos-functionargs.nix at 7b5fc4a984a2db7c90e7fc884e2e0c076ad07df7 - bbjubjub2494/lix - Lix Systems

bbjubjub2494/lix

forked from lix-project/lix

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

4 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; }