From ad65a50a94a97bf1f1a1902f43542d28a2e8206b Mon Sep 17 00:00:00 2001
From: Tom Sydney Kerckhove <syd@cs-syd.eu>
Date: Sat, 20 Apr 2024 14:46:23 +0200
Subject: [PATCH] Remove the 'prev' check

---
 src/nix/flake.cc | 5 -----
 1 file changed, 5 deletions(-)

diff --git a/src/nix/flake.cc b/src/nix/flake.cc
index 4825ab0e1..d5987237f 100644
--- a/src/nix/flake.cc
+++ b/src/nix/flake.cc
@@ -454,11 +454,6 @@ struct CmdFlakeCheck : FlakeCommand
                 if (v.payload.lambda.fun->hasFormals()
                     || !argHasName(v.payload.lambda.fun->arg, "final"))
                     throw Error("overlay does not take an argument named 'final'");
-                auto body = dynamic_cast<ExprLambda *>(v.payload.lambda.fun->body);
-                if (!body
-                    || body->hasFormals()
-                    || !argHasName(body->arg, "prev"))
-                    throw Error("overlay does not take an argument named 'prev'");
                 // FIXME: if we have a 'nixpkgs' input, use it to
                 // evaluate the overlay.
             } catch (Error & e) {