FIR: partial function type resolve + some rendering fixes

compiler/fir/tree/src/org/jetbrains/kotlin/fir/FirRenderer.kt

@@ -14,6 +14,7 @@ import org.jetbrains.kotlin.fir.symbols.ConeSymbol
 import org.jetbrains.kotlin.fir.symbols.impl.FirTypeParameterSymbol
 import org.jetbrains.kotlin.fir.types.*
 import org.jetbrains.kotlin.fir.visitors.FirVisitorVoid
+import org.jetbrains.kotlin.name.SpecialNames
 import org.jetbrains.kotlin.types.Variance
 import org.jetbrains.kotlin.utils.Printer
 
@@ -92,6 +93,7 @@ class FirRenderer(builder: StringBuilder) : FirVisitorVoid() {
         visitMemberDeclaration(callableMember)
         val receiverType = callableMember.receiverType
         if (receiverType != null) {
+            print(" ")
             receiverType.accept(this)
             print(".")
         }
@@ -324,7 +326,9 @@ class FirRenderer(builder: StringBuilder) : FirVisitorVoid() {
         if (valueParameter.isVararg) {
             print("vararg ")
         }
-        print(valueParameter.name.toString() + ": ")
+        if (valueParameter.name != SpecialNames.NO_NAME_PROVIDED) {
+            print(valueParameter.name.toString() + ": ")
+        }
         valueParameter.returnType.accept(this)
         valueParameter.defaultValue?.let {
             print(" = ")
@@ -399,7 +403,7 @@ class FirRenderer(builder: StringBuilder) : FirVisitorVoid() {
             print(".")
         }
         functionType.valueParameters.renderParameters()
-        print(": ")
+        print(" -> ")
         functionType.returnType.accept(this)
         print(" )")
         visitTypeWithNullability(functionType)