Merge commit '3c60637c1a27da8ba66888de518d58d5707801f2' as 'repos/effect-smol'

repos/effect-smol/packages/effect/test/MutableHashSet.test.ts

@@ -0,0 +1,10 @@
+import { describe, it } from "@effect/vitest"
+import { assertFalse, assertTrue } from "@effect/vitest/utils"
+import { MutableHashSet } from "effect"
+
+describe("MutableHashSet", () => {
+  it("isMutableHashSet distinguishes Effect mutable hash sets from native sets", () => {
+    assertTrue(MutableHashSet.isMutableHashSet(MutableHashSet.make("a", "b")))
+    assertFalse(MutableHashSet.isMutableHashSet(new Set(["a", "b"])))
+  })
+})