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{ lib }:
let
# This is essentially the same thing as `lib.makeOverridable`, except storing
# the override method in a method named `overridePackage` so that it's not
# shadowed by the `override` method added by `callPackage`
makePackageOverridable = f: args:
let
result = lib.makeOverridable f args;
copyArgs = g: lib.setFunctionArgs g (lib.functionArgs f);
overrideWith =
update: args // (if lib.isFunction update then update args else update);
overridePackage =
copyArgs (update: makePackageOverridable f (overrideWith update));
in
result // { inherit overridePackage; };
in
lib // {
inherit makePackageOverridable;
}
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