From a5b549e816e9eeb1e76303f837ee2d1324c250a5 Mon Sep 17 00:00:00 2001
From: Frederik Rietdijk <fridh@fridh.nl>
Date: Sun, 18 Aug 2019 13:01:45 +0200
Subject: [PATCH] icestorm: fix eval

---
 pkgs/development/tools/icestorm/default.nix | 8 ++++----
 1 file changed, 4 insertions(+), 4 deletions(-)

diff --git a/pkgs/development/tools/icestorm/default.nix b/pkgs/development/tools/icestorm/default.nix
index b7b302fe08cf..851acd17b7ea 100644
--- a/pkgs/development/tools/icestorm/default.nix
+++ b/pkgs/development/tools/icestorm/default.nix
@@ -9,13 +9,13 @@
 , usePyPy ? stdenv.isx86_64 /* pypy3 seems broken on i686 */
 }:
 
-let
-  pythonPkg = if usePyPy then pypy3 else python3;
-  pythonInterp = pythonPkg.interpreter;
-in stdenv.mkDerivation rec {
+stdenv.mkDerivation rec {
   pname = "icestorm";
   version = "2019.08.08";
 
+  pythonPkg = if usePyPy then pypy3 else python3;
+  pythonInterp = pythonPkg.interpreter;
+
   src = fetchFromGitHub {
     owner  = "cliffordwolf";
     repo   = "icestorm";