Without the fix the eval fails as:
$ nix build --no-link -f. pre-commit.tests
error:
… while calling a functor (an attribute set with a '__functor' attribute)
at lib/customisation.nix:304:7:
303| if missingArgs == { } then
304| makeOverridable f allArgs
| ^
305| # This needs to be an abort so it can't be caught with `builtins.tryEval`,
… while evaluating a branch condition
at lib/customisation.nix:171:7:
170| in
171| if isAttrs result then
| ^
172| result
(stack trace truncated; use '--show-trace' to show the full, detailed trace)
error: function 'anonymous lambda' called with unexpected argument 'git'
at pkgs/by-name/pr/pre-commit/tests.nix:1:1:
1| {
| ^
2| gitMinimal,
f0204274d3