Fixed duplication of some generic functions in code completion

idea/idea-completion/testData/basic/multifile/NoGenericFunDuplication/NoGenericFunDuplication.dependency.kt

@@ -0,0 +1,5 @@
+package dependency
+
+class MyPair<A, B>(public val first: A, public val second: B)
+
+public fun <A, B> A.pair(that: B): MyPair<A, B> = MyPair(this, that)

idea/idea-completion/testData/basic/multifile/NoGenericFunDuplication/NoGenericFunDuplication.kt

@@ -0,0 +1,9 @@
+// this test tests correct substitution equality checking for generic functions
+import dependency.pair
+
+fun foo() {
+    1 pai<caret>
+}
+
+// EXIST: pair
+// NUMBER: 1