nix/eval-okay-getattrpos-functionargs.nix at a5d85d07faa94cf3518e98273be4bee3d495f06a - nix - nordic-dev.net

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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

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