[FIR] Prevent missing diagnostics on free lambdas

The change in `FirPsiDiagnosticTestGenerated.Resolve#testCast`
only highlights the existing
problem that we don't assign a
valid type to `_`.

^KT-58906 Fixed

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

@@ -9,8 +9,8 @@ val returnTypeWithParameter = { <!COMPONENT_FUNCTION_MISSING!>(b: Int): Int<!> -
 
 val receiverWithFunctionType = { ((Int)<!SYNTAX!><!> <!SYNTAX!>-> Int).() -><!> }
 
-val parenthesizedParameters = { <!COMPONENT_FUNCTION_MISSING!>(a: Int)<!> -> }
-val parenthesizedParameters2 = { <!COMPONENT_FUNCTION_MISSING!>(b)<!> -> }
+val parenthesizedParameters = { <!COMPONENT_FUNCTION_MISSING, VALUE_PARAMETER_WITH_NO_TYPE_ANNOTATION!>(a: Int)<!> -> }
+val parenthesizedParameters2 = { <!COMPONENT_FUNCTION_MISSING, VALUE_PARAMETER_WITH_NO_TYPE_ANNOTATION!>(b)<!> -> }
 
 val none = { -> }
 
@@ -18,7 +18,7 @@ val none = { -> }
 val parameterWithFunctionType = { a: ((Int) -> Int) -> <!SYNTAX!><!>} // todo fix parser
 
 val newSyntax = { a: Int -> }
-val newSyntax1 = { a, b -> }
+val newSyntax1 = { <!VALUE_PARAMETER_WITH_NO_TYPE_ANNOTATION!>a<!>, <!VALUE_PARAMETER_WITH_NO_TYPE_ANNOTATION!>b<!> -> }
 val newSyntax2 = { a: Int, b: Int -> }
-val newSyntax3 = { a, b: Int -> }
-val newSyntax4 = { a: Int, b -> }
+val newSyntax3 = { <!VALUE_PARAMETER_WITH_NO_TYPE_ANNOTATION!>a<!>, b: Int -> }
+val newSyntax4 = { a: Int, <!VALUE_PARAMETER_WITH_NO_TYPE_ANNOTATION!>b<!> -> }