Add tests for obsolete issues

#KT-31784 Obsolete
 #KT-31757 Obsolete

compiler/testData/codegen/box/coroutines/kt31784.kt

@@ -0,0 +1,34 @@
+// !LANGUAGE: +NewInference
+// WITH_RUNTIME
+
+@file:UseExperimental(ExperimentalTypeInference::class)
+
+package test
+
+import kotlin.experimental.ExperimentalTypeInference
+
+interface Builder<T : Any> {
+    fun filter(filter: (T) -> Boolean)
+}
+
+fun <T : Any> build(@BuilderInference block: Builder<T>.() -> Unit): T {
+    val o = object : Builder<T> {
+        override fun filter(filter: (T) -> Boolean) {
+
+        }
+    }
+
+    o.block()
+
+    return 42 as T
+}
+
+fun box(): String {
+    val r = build<Int> {
+        filter {
+            it > 10
+        }
+    }
+
+    return if (r == 42) "OK" else "Fail: $r"
+}

compiler/testData/codegen/box/fullJdk/kt31757.kt

@@ -0,0 +1,19 @@
+// !LANGUAGE: +NewInference
+// TARGET_BACKEND: JVM
+// FULL_JDK
+
+package test
+
+import java.util.function.*
+
+interface Interface1<T> : () -> T, Supplier<T> {
+    override fun invoke() = get()
+}
+
+class Impl : Interface1<String> {
+    override fun get(): String = "OK"
+}
+
+fun box(): String {
+    return Impl()()
+}