K1/K2: add more tests around intellij.vcs.git example

compiler/testData/diagnostics/tests/j+k/withTestConnection2.kt

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+// FIR_IDENTICAL
+// FULL_JDK
+// JVM_TARGET: 1.8
+
+// FILE: test.kt
+
+fun waitTestConnection(res: B<*>) {
+    C.wait(res.toFuture())
+}
+
+// FILE: B.kt
+
+import java.util.concurrent.CompletableFuture
+
+abstract class B<S> {
+    abstract fun toFuture(): CompletableFuture<S>
+}
+
+// FILE: C.java
+
+import java.util.concurrent.Future;
+
+public class C {
+    public static <F> F wait(Future<F> future) {
+        return null;
+    }
+}

compiler/testData/diagnostics/tests/j+k/withTestConnection3.fir.kt

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+// FULL_JDK
+// JVM_TARGET: 1.8
+
+// FILE: test.kt
+
+fun waitTestConnection(res: B<*>) {
+    C.wait(res.toFuture()).length
+}
+
+// FILE: B.kt
+
+import java.util.concurrent.CompletableFuture
+
+abstract class B<S : CharSequence?> {
+    abstract fun toFuture(): CompletableFuture<S>
+}
+
+// FILE: C.java
+
+import java.util.concurrent.Future;
+
+public class C {
+    public static <F> F wait(Future<F> future) {
+        return null;
+    }
+}

compiler/testData/diagnostics/tests/j+k/withTestConnection3.kt

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+// FULL_JDK
+// JVM_TARGET: 1.8
+
+// FILE: test.kt
+
+fun waitTestConnection(res: B<*>) {
+    C.wait(res.toFuture())<!UNSAFE_CALL!>.<!>length
+}
+
+// FILE: B.kt
+
+import java.util.concurrent.CompletableFuture
+
+abstract class B<S : CharSequence?> {
+    abstract fun toFuture(): CompletableFuture<S>
+}
+
+// FILE: C.java
+
+import java.util.concurrent.Future;
+
+public class C {
+    public static <F> F wait(Future<F> future) {
+        return null;
+    }
+}

compiler/testData/diagnostics/tests/j+k/withTestConnection4.kt

@@ -0,0 +1,27 @@
+// FIR_IDENTICAL
+// FULL_JDK
+// JVM_TARGET: 1.8
+
+// FILE: test.kt
+
+fun waitTestConnection(res: B<*>) {
+    C.wait(res.toFuture())
+}
+
+// FILE: B.kt
+
+import java.util.concurrent.CompletableFuture
+
+abstract class B<S> {
+    abstract fun toFuture(): CompletableFuture<MutableList<S>>
+}
+
+// FILE: C.java
+
+import java.util.concurrent.Future;
+
+public class C {
+    public static <F> F wait(Future<F> future) {
+        return null;
+    }
+}