K2: add a pair of KJ tests related to KT-64846 but w/out explicit override

compiler/testData/diagnostics/tests/j+k/collectionOverrides/charAtAndOverloadWithoutExplicitOverride.kt

@@ -0,0 +1,24 @@
+// FIR_IDENTICAL
+// SCOPE_DUMP: KA:get
+
+// FILE: A.java
+abstract public class A implements CharSequence {
+    public final int length() {
+        return 0;
+    }
+
+    public char charAt(int index) {
+        return ' ';
+    }
+
+    public char get(int index) {
+        return 'X';
+    }
+}
+
+// FILE: main.kt
+abstract class KA : A()
+
+fun foo(a: A, ka: KA) {
+    ka.get(0)
+}

compiler/testData/diagnostics/tests/j+k/collectionOverrides/charAtAndOverloadWithoutExplicitOverride.overrides.txt

@@ -0,0 +1,6 @@
+KA:
+  [Enhancement]: public open operator fun get(index: R|kotlin/Int|): R|kotlin/Char| from Use site scope of /KA [id: 0]
+    [Enhancement]: public open operator fun get(index: R|kotlin/Int|): R|kotlin/Char| from Java enhancement scope for /A [id: 0]
+  [Enhancement]: /* hidden due to clash */ public open operator fun get(index: R|kotlin/Int|): R|kotlin/Char| from Use site scope of /KA [id: 0]
+    [Enhancement]: /* hidden due to clash */ public open operator fun get(index: R|kotlin/Int|): R|kotlin/Char| from Java enhancement scope for /A [id: 0]
+      [Library]: public abstract operator fun get(index: R|kotlin/Int|): R|kotlin/Char| from Use site scope of kotlin/CharSequence [id: 1]

compiler/testData/diagnostics/tests/j+k/collectionOverrides/containsAndOverloadWithoutExplicitOverride.fir.kt

@@ -0,0 +1,18 @@
+// !DIAGNOSTICS: -UNUSED_PARAMETER -UNUSED_VARIABLE -PARAMETER_NAME_CHANGED_ON_OVERRIDE
+// SCOPE_DUMP: KA:contains
+
+// FILE: A.java
+abstract public class A implements java.util.Collection<String> {
+    public boolean contains(Object x) {return false;}
+    public boolean contains(String x) {return false;}
+}
+
+// FILE: main.kt
+abstract class KA : A()
+
+fun foo(a: A, ka: KA) {
+    ka.contains("")
+    ka.contains(<!ARGUMENT_TYPE_MISMATCH!>1<!>)
+    "" in ka
+    <!ARGUMENT_TYPE_MISMATCH!>1<!> in ka
+}

compiler/testData/diagnostics/tests/j+k/collectionOverrides/containsAndOverloadWithoutExplicitOverride.fir.overrides.txt

@@ -0,0 +1,13 @@
+KA:
+  [Enhancement]: public open operator fun contains(x: R|kotlin/String!|): R|kotlin/Boolean| from Use site scope of /KA [id: 0]
+    [Enhancement]: public open operator fun contains(x: R|kotlin/String!|): R|kotlin/Boolean| from Java enhancement scope for /A [id: 0]
+      [SubstitutionOverride(DeclarationSite)]: public abstract operator fun contains(element: R|kotlin/String!|): R|kotlin/Boolean| from Substitution scope for [Use site scope of kotlin/collections/MutableCollection] for type A [id: 1]
+        [SubstitutionOverride(DeclarationSite)]: public abstract operator fun contains(element: R|E|): R|kotlin/Boolean| from Use site scope of kotlin/collections/MutableCollection [id: 2]
+          [SubstitutionOverride(DeclarationSite)]: public abstract operator fun contains(element: R|E|): R|kotlin/Boolean| from Substitution scope for [Use site scope of kotlin/collections/Collection] for type kotlin/collections/MutableCollection<E> [id: 2]
+            [Library]: public abstract operator fun contains(element: R|E|): R|kotlin/Boolean| from Use site scope of kotlin/collections/Collection [id: 3]
+  [Enhancement]: /* hidden due to clash */ public open operator fun contains(x: R|kotlin/String!|): R|kotlin/Boolean| from Use site scope of /KA [id: 0]
+    [Enhancement]: /* hidden due to clash */ public open operator fun contains(x: R|kotlin/String!|): R|kotlin/Boolean| from Java enhancement scope for /A [id: 0]
+      [SubstitutionOverride(DeclarationSite)]: public abstract operator fun contains(element: R|kotlin/String!|): R|kotlin/Boolean| from Substitution scope for [Use site scope of kotlin/collections/MutableCollection] for type A [id: 1]
+        [SubstitutionOverride(DeclarationSite)]: public abstract operator fun contains(element: R|E|): R|kotlin/Boolean| from Use site scope of kotlin/collections/MutableCollection [id: 2]
+          [SubstitutionOverride(DeclarationSite)]: public abstract operator fun contains(element: R|E|): R|kotlin/Boolean| from Substitution scope for [Use site scope of kotlin/collections/Collection] for type kotlin/collections/MutableCollection<E> [id: 2]
+            [Library]: public abstract operator fun contains(element: R|E|): R|kotlin/Boolean| from Use site scope of kotlin/collections/Collection [id: 3]

compiler/testData/diagnostics/tests/j+k/collectionOverrides/containsAndOverloadWithoutExplicitOverride.kt

@@ -0,0 +1,18 @@
+// !DIAGNOSTICS: -UNUSED_PARAMETER -UNUSED_VARIABLE -PARAMETER_NAME_CHANGED_ON_OVERRIDE
+// SCOPE_DUMP: KA:contains
+
+// FILE: A.java
+abstract public class A implements java.util.Collection<String> {
+    public boolean contains(Object x) {return false;}
+    public boolean contains(String x) {return false;}
+}
+
+// FILE: main.kt
+abstract class KA : A()
+
+fun foo(a: A, ka: KA) {
+    ka.contains("")
+    ka.contains(<!CONSTANT_EXPECTED_TYPE_MISMATCH!>1<!>)
+    "" in ka
+    <!CONSTANT_EXPECTED_TYPE_MISMATCH!>1<!> in ka
+}