[FIR] Fix missing receiver type if anonymous function without label

compiler/testData/diagnostics/tests/inference/constraints/equalityConstraintOnNullableType.fir.kt

@@ -1,19 +0,0 @@
-// !CHECK_TYPE
-interface A<T>
-
-fun <T> foo(a: A<T>, aN: A<T?>): T = throw Exception("$a $aN")
-
-fun <T> doA(a: A<T>): T = throw Exception("$a")
-
-fun test(a: A<Int>, aN: A<Int?>) {
-    val aa = doA(aN)
-    aa checkType {  <!UNRESOLVED_REFERENCE!>_<!><Int?>() }
-
-    val nullable = foo(aN, aN)
-    //T = Int?, T? = Int? => T = Int?
-    nullable checkType { <!UNRESOLVED_REFERENCE!>_<!><Int?>() }
-
-    val notNullable = foo(a, aN)
-    //T = Int, T? = Int? => T = Int
-    notNullable checkType { <!UNRESOLVED_REFERENCE!>_<!><Int>() }
-}

compiler/testData/diagnostics/tests/inference/constraints/equalityConstraintOnNullableType.kt

@@ -1,3 +1,4 @@
+// FIR_IDENTICAL
 // !CHECK_TYPE
 interface A<T>
 

compiler/testData/diagnostics/tests/inference/constraints/notNullConstraintOnNullableType.fir.kt

@@ -15,7 +15,7 @@ fun test(out: Out<Int>, i: In<Int>, inv: A<Int>) {
     // T? >: Int => T = Int
     doT(1)
     val r = doOut(out)
-    r checkType { <!UNRESOLVED_REFERENCE!>_<!><Int>() }
+    r checkType { _<Int>() }
 
     // T? <: Int => error
     <!INAPPLICABLE_CANDIDATE!>doIn<!>(i)

compiler/testData/diagnostics/tests/inference/constraints/subtypeConstraintOnNullableType.fir.kt

@@ -1,22 +0,0 @@
-// !CHECK_TYPE
-interface A<T>
-
-interface Out<out T>
-
-fun <T> foo(a: A<T>, o: Out<T?>): T = throw Exception("$a $o")
-
-fun <T> doOut(o: Out<T?>): T = throw Exception("$o")
-
-fun test(a: A<Int>, aN: A<Int?>, o: Out<Int?>) {
-    val out = doOut(o)
-    //T? >: Int? => T >: Int
-    out checkType { <!UNRESOLVED_REFERENCE!>_<!><Int>() }
-
-    val nullable = foo(aN, o)
-    //T = Int?, T? >: Int? => T = Int?
-    nullable checkType { <!UNRESOLVED_REFERENCE!>_<!><Int?>() }
-
-    val notNullable = foo(a, o)
-    //T = Int, T? >: Int? => T = Int
-    notNullable checkType { <!UNRESOLVED_REFERENCE!>_<!><Int>() }
-}

compiler/testData/diagnostics/tests/inference/constraints/subtypeConstraintOnNullableType.kt

@@ -1,3 +1,4 @@
+// FIR_IDENTICAL
 // !CHECK_TYPE
 interface A<T>
 

compiler/testData/diagnostics/tests/inference/constraints/supertypeConstraintOnNullableType.fir.kt

@@ -1,22 +0,0 @@
-// !CHECK_TYPE
-interface A<T>
-
-interface In<in T>
-
-fun <T> foo(a: A<T>, i: In<T>): T = throw Exception("$a $i")
-
-fun <T> doIn(i: In<T?>): T = throw Exception("$i")
-
-fun test(a: A<Int>, aN: A<Int?>, i: In<Int?>) {
-    val _in = doIn(i)
-    //T? <: Int? => T <: Int?
-    _in checkType { <!UNRESOLVED_REFERENCE!>_<!><Int?>() }
-
-    val notNullable = foo(a, i)
-    //T = Int, T? <: Int? => T = Int
-    notNullable checkType { <!UNRESOLVED_REFERENCE!>_<!><Int>() }
-
-    val nullable = foo(aN, i)
-    //T = Int?, T? <: Int? => T = Int?
-    nullable checkType { <!UNRESOLVED_REFERENCE!>_<!><Int?>() }
-}

compiler/testData/diagnostics/tests/inference/constraints/supertypeConstraintOnNullableType.kt

@@ -1,3 +1,4 @@
+// FIR_IDENTICAL
 // !CHECK_TYPE
 interface A<T>