From dc251ab95c8b1ea304afaa10842fb9397ad7c980 Mon Sep 17 00:00:00 2001
From: Sergei Trofimovich <slyich@gmail.com>
Date: Sun, 1 Jun 2025 10:05:17 +0100
Subject: [PATCH] pythonInterpreters.pypy310_prebuilt: set `mainProgram`
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Without the change the eval fails as:

    $ nix build --no-link -f. pythonInterpreters.pypy310_prebuilt.tests.test-packageOverrides
    error:
       … in the condition of the assert statement
         at pkgs/development/interpreters/python/tests.nix:212:11:
          211|           in
          212|           assert myPython.pkgs.foobar == myPython.pkgs.numpy;
             |           ^
          213|           myPython.withPackages (ps: with ps; [ foobar ]);

       … while evaluating the attribute 'outPath'
         at lib/customisation.nix:421:7:
          420|         drv.drvPath;
          421|       outPath =
             |       ^
          422|         assert condition;

       (stack trace truncated; use '--show-trace' to show the full, detailed trace)

       error: attribute 'mainProgram' missing
       at pkgs/by-name/me/meson/package.nix:75:52:
           74|           --replace-fail "PythonExternalProgram('python3', mesonlib.python_command)" \
           75|                          "PythonExternalProgram('${python3.meta.mainProgram}', mesonlib.python_command)"
             |                                                    ^
           76|         substituteInPlace mesonbuild/modules/python3.py \
---
 pkgs/development/interpreters/python/pypy/prebuilt.nix | 1 +
 1 file changed, 1 insertion(+)

diff --git a/pkgs/development/interpreters/python/pypy/prebuilt.nix b/pkgs/development/interpreters/python/pypy/prebuilt.nix
index b80429328f32..ec920405067e 100644
--- a/pkgs/development/interpreters/python/pypy/prebuilt.nix
+++ b/pkgs/development/interpreters/python/pypy/prebuilt.nix
@@ -176,6 +176,7 @@ stdenv.mkDerivation {
   meta = with lib; {
     homepage = "http://pypy.org/";
     description = "Fast, compliant alternative implementation of the Python language (${pythonVersion})";
+    mainProgram = "pypy";
     license = licenses.mit;
     platforms = lib.mapAttrsToList (arch: _: arch) downloadUrls;
   };