NI: do type checking for anonymous functions not inside a call

^KT-38890 Fixed
^KT-38439 Fixed

compiler/testData/diagnostics/tests/functionLiterals/ExpectedParameterTypeMismatchVariance.kt

@@ -16,6 +16,6 @@ fun test(s: Sub) {
         t: Trait -> s
     }
 
-    foo(<!TYPE_MISMATCH!>fun(<!EXPECTED_PARAMETER_TYPE_MISMATCH!>t: Sub<!>) = s<!>)
+    foo(<!NI;TYPE_MISMATCH, TYPE_MISMATCH!>fun(<!EXPECTED_PARAMETER_TYPE_MISMATCH!>t: Sub<!>) = s<!>)
     foo(<!TYPE_MISMATCH!>fun(t): Super = s<!>)
 }

compiler/testData/diagnostics/tests/functionLiterals/missedTypeMismatch.fir.kt

@@ -0,0 +1,40 @@
+// !DIAGNOSTICS: -UNUSED_VARIABLE -UNUSED_PARAMETER -UNUSED_ANONYMOUS_PARAMETER -UNCHECKED_CAST
+// Issues: KT-38890, KT-38439
+
+fun foo(x: () -> Int) {}
+
+fun <T>id(x: T) = x
+
+// Before the fix, there wasn't any type mismatch error in NI due to result type not being a subtype of expected type
+fun main() {
+    val x: () -> Int = { "" }
+
+    val a0: () -> Int = fun(): String = "1"
+    val a1: () -> Int = (fun() = "1")
+    val a2: () -> Unit = (fun() = "1")
+    val a3: Unit = (fun() = "1")
+    val a4 = (fun() = "1")
+    val a5 = (fun(): String = "1")
+    val a6: () -> Int = (fun() = 1)
+    val a7: () -> Int = (fun(): String = "1") as () -> Int
+    val a8: () -> Int = fun(): String = "1"
+    val a9: () -> () -> () -> Int = fun(): () -> () -> String = fun(): () -> String = fun(): String = "1"
+
+    <!INAPPLICABLE_CANDIDATE!>foo<!>(fun(): String = "1")
+    <!INAPPLICABLE_CANDIDATE!>foo<!>(((fun(): String = "1")))
+
+    val a10: Int.(String) -> Int = fun (x: String) = 10
+    val a11: () -> () -> () -> Int = fun() = fun() = fun(): String = "1"
+
+    val a12: Int = fun(): String = "1"
+    val a13: Int = fun() = fun(): String = "1"
+    val a14: Int = fun() = fun() = "1"
+    val a15: Int = fun() = fun() = {}
+    val a16: Int = fun() = fun() {}
+
+    val a17: () -> Unit = fun() {}
+    val a18: () -> Int = fun() {}
+    val a19: () -> () -> Int = fun() = fun() {}
+    val a20: () -> () -> () -> Unit = fun() = fun() = {}
+    val a21: () -> () -> () -> Int = fun() = fun() = {}
+}

compiler/testData/diagnostics/tests/functionLiterals/missedTypeMismatch.kt

@@ -0,0 +1,40 @@
+// !DIAGNOSTICS: -UNUSED_VARIABLE -UNUSED_PARAMETER -UNUSED_ANONYMOUS_PARAMETER -UNCHECKED_CAST
+// Issues: KT-38890, KT-38439
+
+fun foo(x: () -> Int) {}
+
+fun <T>id(x: T) = x
+
+// Before the fix, there wasn't any type mismatch error in NI due to result type not being a subtype of expected type
+fun main() {
+    val x: () -> Int = { <!TYPE_MISMATCH!>""<!> }
+
+    val a0: () -> Int = <!TYPE_MISMATCH!>fun(): String = "1"<!>
+    val a1: () -> Int = (<!TYPE_MISMATCH!>fun() = "1"<!>)
+    val a2: () -> Unit = (<!TYPE_MISMATCH!>fun() = "1"<!>)
+    val a3: Unit = (<!TYPE_MISMATCH!>fun() = "1"<!>)
+    val a4 = (fun() = "1")
+    val a5 = (fun(): String = "1")
+    val a6: () -> Int = (fun() = 1)
+    val a7: () -> Int = (fun(): String = "1") as () -> Int
+    val a8: () -> Int = <!TYPE_MISMATCH!>fun(): String = "1"<!>
+    val a9: () -> () -> () -> Int = <!TYPE_MISMATCH!>fun(): () -> () -> String = fun(): () -> String = fun(): String = "1"<!>
+
+    foo(<!TYPE_MISMATCH!>fun(): String = "1"<!>)
+    foo(((<!TYPE_MISMATCH!>fun(): String = "1"<!>)))
+
+    val a10: Int.(String) -> Int = <!TYPE_MISMATCH!>fun (x: String) = 10<!>
+    val a11: () -> () -> () -> Int = <!TYPE_MISMATCH!>fun() = fun() = fun(): String = "1"<!>
+
+    val a12: Int = <!TYPE_MISMATCH!>fun(): String = "1"<!>
+    val a13: Int = <!TYPE_MISMATCH!>fun() = fun(): String = "1"<!>
+    val a14: Int = <!TYPE_MISMATCH!>fun() = fun() = "1"<!>
+    val a15: Int = <!TYPE_MISMATCH!>fun() = fun() = {}<!>
+    val a16: Int = <!TYPE_MISMATCH!>fun() = fun() {}<!>
+
+    val a17: () -> Unit = fun() {}
+    val a18: () -> Int = <!TYPE_MISMATCH!>fun() {}<!>
+    val a19: () -> () -> Int = <!TYPE_MISMATCH!>fun() = fun() {}<!>
+    val a20: () -> () -> () -> Unit = fun() = fun() = {}
+    val a21: () -> () -> () -> Int = <!TYPE_MISMATCH!>fun() = fun() = {}<!>
+}

compiler/testData/diagnostics/tests/functionLiterals/missedTypeMismatch.txt

@@ -0,0 +1,5 @@
+package
+
+public fun foo(/*0*/ x: () -> kotlin.Int): kotlin.Unit
+public fun </*0*/ T> id(/*0*/ x: T): T
+public fun main(): kotlin.Unit