Allowed call value with extension function type as simple function type.

compiler/testData/diagnostics/tests/resolve/invoke/errors/receiverPresenceErrorForInvoke.kt

@@ -1,7 +1,7 @@
 fun test1(f: String.() -> Unit) {
-    <!MISSING_RECEIVER!>(f)<!>()
+    (f)(<!NO_VALUE_FOR_PARAMETER!>)<!>
 
-    <!MISSING_RECEIVER!>f<!>()
+    f(<!NO_VALUE_FOR_PARAMETER!>)<!>
 }
 
 fun test2(f: (Int) -> Int) {

compiler/testData/diagnostics/tests/resolve/invoke/extensionValueAsNonExtension.kt

@@ -0,0 +1,22 @@
+// !DIAGNOSTICS: -UNUSED_EXPRESSION -UNUSED_PARAMETER -UNUSED_VARIABLE
+class A
+
+fun test(foo: A.() -> Int, a: A) {
+    val b: Int = foo(a)
+    val c: Int = (foo)(a)
+}
+
+class B {
+    val foo: A.() -> Int = null!!
+
+    init {
+        val b: Int = foo(A())
+    }
+}
+
+fun foo(): A.() -> Int {
+    val b: Int = foo()(A())
+    val c: Int = (foo())(A())
+
+    <!UNREACHABLE_CODE!>return<!> null!!
+}

compiler/testData/diagnostics/tests/resolve/invoke/extensionValueAsNonExtension.txt

@@ -0,0 +1,19 @@
+package
+
+public fun foo(): A.() -> kotlin.Int
+public fun test(/*0*/ foo: A.() -> kotlin.Int, /*1*/ a: A): kotlin.Unit
+
+public final class A {
+    public constructor A()
+    public open override /*1*/ /*fake_override*/ fun equals(/*0*/ other: kotlin.Any?): kotlin.Boolean
+    public open override /*1*/ /*fake_override*/ fun hashCode(): kotlin.Int
+    public open override /*1*/ /*fake_override*/ fun toString(): kotlin.String
+}
+
+public final class B {
+    public constructor B()
+    public final val foo: A.() -> kotlin.Int
+    public open override /*1*/ /*fake_override*/ fun equals(/*0*/ other: kotlin.Any?): kotlin.Boolean
+    public open override /*1*/ /*fake_override*/ fun hashCode(): kotlin.Int
+    public open override /*1*/ /*fake_override*/ fun toString(): kotlin.String
+}