stdenv/check-meta: construct name from pname and version if name unavailable

pkgs/stdenv/generic/check-meta.nix

@@ -7,6 +7,7 @@ let
   # If we're in hydra, we can dispense with the more verbose error
   # messages and make problems easier to spot.
   inHydra = config.inHydra or false;
+  getName = attrs: attrs.name or ("${attrs.pname or "«name-missing»"}-${attrs.version or "«version-missing»"}");
 
   # See discussion at https://github.com/NixOS/nixpkgs/pull/25304#issuecomment-298385426
   # for why this defaults to false, but I (@copumpkin) want to default it to true soon.
@@ -107,23 +108,23 @@ let
         You can install it anyway by whitelisting this package, using the
         following methods:
 
-        a) for `nixos-rebuild` you can add ‘${attrs.name or "«name-missing»"}’ to
+        a) for `nixos-rebuild` you can add ‘${getName attrs}’ to
            `nixpkgs.config.permittedInsecurePackages` in the configuration.nix,
            like so:
 
              {
                nixpkgs.config.permittedInsecurePackages = [
-                 "${attrs.name or "«name-missing»"}"
+                 "${getName attrs}"
                ];
              }
 
         b) For `nix-env`, `nix-build`, `nix-shell` or any other Nix command you can add
-        ‘${attrs.name or "«name-missing»"}’ to `permittedInsecurePackages` in
+        ‘${getName attrs}’ to `permittedInsecurePackages` in
         ~/.config/nixpkgs/config.nix, like so:
 
              {
                permittedInsecurePackages = [
-                 "${attrs.name or "«name-missing»"}"
+                 "${getName attrs}"
                ];
              }
 
@@ -134,9 +135,9 @@ let
       actualOutputs = attrs.outputs or [ "out" ];
       missingOutputs = builtins.filter (output: ! builtins.elem output actualOutputs) expectedOutputs;
     in ''
-      The package ${attrs.name} has set meta.outputsToInstall to: ${builtins.concatStringsSep ", " expectedOutputs}
+      The package ${getName attrs} has set meta.outputsToInstall to: ${builtins.concatStringsSep ", " expectedOutputs}
 
-      however ${attrs.name} only has the outputs: ${builtins.concatStringsSep ", " actualOutputs}
+      however ${getName attrs} only has the outputs: ${builtins.concatStringsSep ", " actualOutputs}
 
       and is missing the following ouputs:
 
@@ -146,9 +147,9 @@ let
   handleEvalIssue = { meta, attrs }: { reason , errormsg ? "" }:
     let
       msg = if inHydra
-        then "Failed to evaluate ${attrs.name or "«name-missing»"}: «${reason}»: ${errormsg}"
+        then "Failed to evaluate ${getName attrs}: «${reason}»: ${errormsg}"
         else ''
-          Package ‘${attrs.name or "«name-missing»"}’ in ${pos_str meta} ${errormsg}, refusing to evaluate.
+          Package ‘${getName attrs}’ in ${pos_str meta} ${errormsg}, refusing to evaluate.
 
         '' + (builtins.getAttr reason remediation) attrs;