NI: improve lambdas completion – look at all postponed arguments during resolution lambdas by additional conditions

^KT-36819 Fixed
^KT-36069 Fixed

compiler/testData/diagnostics/tests/inference/completion/lambdaWithVariableAndNothing.kt

@@ -46,7 +46,7 @@ fun testNoSmartCast3(s: String?) {
 fun testNoSmartCast4(s: String?) {
     id(
         if (s != null) ( {""} )
-        else <!IMPLICIT_NOTHING_TYPE_ARGUMENT_IN_RETURN_POSITION!>noSmartCast4<!>(null) <!TYPE_MISMATCH!>{ <!TYPE_MISMATCH!>""<!> }<!>
+        else noSmartCast4(null) { "" }
     )
     s<!UNSAFE_CALL!>.<!>length
 }

compiler/testData/diagnostics/tests/inference/kt36819.fir.kt

@@ -1,18 +0,0 @@
-// !LANGUAGE: +NewInference
-// !DIAGNOSTICS: -UNUSED_PARAMETER -UNUSED_VARIABLE
-// ISSUE: KT-36819
-
-fun <K> select(vararg x: K) = x[0]
-interface A
-class B: A
-class C: A
-fun <T> id1(x: T): T = x
-fun <R> id2(x: R): R = x
-
-class Out<out R>(x: R)
-
-fun main() {
-    val x1 = select(id1 { B() }, id2 { C() })
-    val x2 = select({ B() }, { C() }) // OK, CST = () -> A
-    val x3 = select(id1(Out(B())), id2(Out(C()))) // OK, CST = Out<A>
-}

compiler/testData/diagnostics/tests/inference/kt36819.kt

@@ -1,5 +1,6 @@
+// FIR_IDENTICAL
 // !LANGUAGE: +NewInference
-// !DIAGNOSTICS: -UNUSED_PARAMETER -UNUSED_VARIABLE
+// !DIAGNOSTICS: -UNUSED_PARAMETER -UNUSED_VARIABLE -UNUSED_ANONYMOUS_PARAMETER
 // ISSUE: KT-36819
 
 fun <K> select(vararg x: K) = x[0]
@@ -12,7 +13,13 @@ fun <R> id2(x: R): R = x
 class Out<out R>(x: R)
 
 fun main() {
-    val x1 = select(id1 { B() }, id2 { <!TYPE_MISMATCH, TYPE_MISMATCH!>C()<!> })
-    val x2 = select({ B() }, { C() }) // OK, CST = () -> A
-    val x3 = select(id1(Out(B())), id2(Out(C()))) // OK, CST = Out<A>
-}
+    val x1 = select(id1 { B() }, id2 { C() })
+    val x2 = select({ B() }, { C() })
+    val x3 = select(id1(Out(B())), id2(Out(C())))
+}
+
+fun <R> fold(initial: R, operation: (R) -> Unit) {}
+
+fun foo() {
+    fold({ x: Int -> x }) { acc -> }
+}

compiler/testData/diagnostics/tests/inference/kt36819.txt

@@ -1,5 +1,7 @@
 package
 
+public fun </*0*/ R> fold(/*0*/ initial: R, /*1*/ operation: (R) -> kotlin.Unit): kotlin.Unit
+public fun foo(): kotlin.Unit
 public fun </*0*/ T> id1(/*0*/ x: T): T
 public fun </*0*/ R> id2(/*0*/ x: R): R
 public fun main(): kotlin.Unit