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Closes #168327 The issue reported there can be demonstrated with the following expression: → nix-instantiate --eval -E "with import ./. {}; pkgs.lib.options.showDefs [ { file = \"foo\"; value = pkgs.rust.packages.stable.buildRustPackages; } ]" error: attempt to call something which is not a function but a string at /home/ma27/Projects/nixpkgs/lib/trivial.nix:442:35: 441| isFunction = f: builtins.isFunction f || 442| (f ? __functor && isFunction (f.__functor f)); | ^ 443| Basically, if a `__functor` is in an attribute-set at depth-limit, `__functor` will be set to `"<unevaluated>"`. This however breaks `lib.isFunction` which checks for a `__functor` by invoking `__functor` with `f` itself. The same issue - "magic" attributes being shadowed by `withRecursion` - also applies to others such as `__pretty`/`__functionArgs`/`__toString`. Since these attributes have a low-risk of causing a stack overflow (because these are flat attr-sets or even functions), ignoring them in `withRecursion` seems like a valid solution. |
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