fixed module cyclic imports (#329)

tests/assert.js

@@ -0,0 +1,49 @@
+export function assert(actual, expected, message) {
+    if (arguments.length === 1)
+        expected = true;
+
+    if (typeof actual === typeof expected) {
+        if (actual === expected) {
+            if (actual !== 0 || (1 / actual) === (1 / expected))
+                return;
+        }
+        if (typeof actual === 'number') {
+            if (isNaN(actual) && isNaN(expected))
+                return;
+        }
+        if (typeof actual === 'object') {
+            if (actual !== null && expected !== null
+            &&  actual.constructor === expected.constructor
+            &&  actual.toString() === expected.toString())
+                return;
+        }
+    }
+    throw Error("assertion failed: got |" + actual + "|" +
+                ", expected |" + expected + "|" +
+                (message ? " (" + message + ")" : ""));
+}
+
+export function assertThrows(err, func)
+{
+    var ex;
+    ex = false;
+    try {
+        func();
+    } catch(e) {
+        ex = true;
+        assert(e instanceof err);
+    }
+    assert(ex, true, "exception expected");
+}
+
+export function assertArrayEquals(a, b)
+{
+    if (!Array.isArray(a) || !Array.isArray(b))
+        return assert(false);
+
+    assert(a.length, b.length);
+
+    a.forEach((value, idx) => {
+        assert(b[idx], value);
+    });
+}

tests/fixture_cyclic_import.js

@@ -0,0 +1,2 @@
+import * as a from "./test_cyclic_import.js"
+export function f(x) { return 2 * a.g(x) }

tests/test_cyclic_import.js

@@ -0,0 +1,12 @@
+/*---
+negative:
+  phase: resolution
+  type: SyntaxError
+---*/
+// FIXME(bnoordhuis) shouldn't throw SyntaxError but that's still better
+// than segfaulting, see https://github.com/quickjs-ng/quickjs/issues/567
+import {assert} from "./assert.js"
+import {f} from "./fixture_cyclic_import.js"
+export {f}
+export function g(x) { return x + 1 }
+assert(f(1), 4)