nixpkgs/pkgs/lib/debug.nix

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Nix
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let lib = import ./default.nix; in
rec {
# Wrapper aroung the primop `addErrorContext', which shouldn't used
# directly. It evaluates and returns `val', but if an evaluation
# error occurs, the text in `msg' is added to the error context
# (stack trace) printed by Nix.
addErrorContext =
if builtins ? addErrorContext
then builtins.addErrorContext
else msg: val: val;
addErrorContextToAttrs = lib.mapAttrs (a : v : lib.addErrorContext "while evaluating ${a}" v);
}