[PowerAssert] Reproduce KT-66208

plugins/power-assert/testData/codegen/operator/ContainsOperator.kt

@@ -1,3 +1,21 @@
 fun box() = expectThrowableMessage {
     assert("Name" in listOf("Hello", "World"))
+} + "\n\n" + expectThrowableMessage {
+    // Test that we don't just search for `in` in the expression.
+    assert(" in " in listOf("Hello", "World"))
+} + "\n\n" + expectThrowableMessage {
+    // Test multiline case
+    assert(
+        " in "
+
+                        in
+
+                   listOf("Hello", "World")
+    )
+} + "\n\n" + expectThrowableMessage {
+    // Test that we don't assume whitespaces around the infix operator
+    assert("Name"/*in*/in/*in*/listOf("Hello", "World"))
+} + "\n\n" + expectThrowableMessage {
+    // Test nested `in`
+    assert(("Name" in listOf("Hello", "World")) in listOf(true))
 }