Don't support overrides

src/transformers/attribute-sets.js

@@ -13,6 +13,7 @@ const objectLiteral = require("./templates/object-literal");
 
 // TODO: Optimize lazy evaluation wrappers by only unpacking them selectively when used in an actual expression; in particular, that avoids the "wrapper that just calls another wrapper" overhead when passing attributes as function arguments
 // TODO: Change to a prototype-based scope object chain? This should produce more consistent output regardless of whether a given set of bindings is static vs. dynamic and recursive vs. non-recursive
+// TODO: Implement __overrides support. Maybe. If I am ever truly desperate for a torturous task. nixpkgs yote it all the way back in 2014 because it is so broken.
 
 let tmplAssertKeys = template(`
 	$assertUniqueKeys( %%keyList%% )
@@ -162,8 +163,13 @@ module.exports = {
 				});
 
 				let hasDynamicBindings = bindings.some((binding) => typeof binding.name !== "string");
+				let hasOverrides = bindings.some((binding) => binding.name === "__overrides");
 
 				if (isRecursive) {
+					if (hasOverrides) {
+						throw new Error(`The __overrides feature is not supported in jsNix`);
+					}
+
 					if (hasDynamicBindings) {
 						return objectRecursiveDynamic(bindings);
 					} else {

tests/upstream-nix.js

@@ -1,5 +1,10 @@
 "use strict";
 
+let ignoredTests = new Set([
+	// We do not support the overrides feature at all, and probably never will
+	"eval-okay-overrides"
+]);
+
 try {
 	const tape = require("tape-catch");
 	const fs = require("fs");
@@ -31,6 +36,10 @@ try {
 
 	for (let test of tests) {
 		try {
+			if (ignoredTests.has(test)) {
+				continue;
+			}
+
 			let expression = fs.readFileSync(path.join(testsPath, `${test}.nix`), "utf8");
 			let expectedResult = fs.readFileSync(path.join(testsPath, `${test}.exp`), "utf8").replace(/\n$/, "");