Introduce call checker for Unit-conversions

compiler/resolution/src/org/jetbrains/kotlin/resolve/calls/components/UnitTypeConversions.kt

@@ -75,6 +75,8 @@ object UnitTypeConversions : ParameterTypeConversion {
             suspendFunction = expectedParameterType.isSuspendFunctionType
         )
 
+        candidate.resolvedCall.registerArgumentWithUnitConversion(argument, nonUnitReturnedParameterType)
+
         candidate.addDiagnostic(LowerPriorityToPreserveCompatibility)
 
         return nonUnitReturnedParameterType

compiler/resolution/src/org/jetbrains/kotlin/resolve/calls/model/ResolutionAtoms.kt

@@ -69,6 +69,7 @@ abstract class ResolvedCallAtom : ResolvedAtom() {
     abstract val knownParametersSubstitutor: TypeSubstitutor
     abstract val argumentsWithConversion: Map<KotlinCallArgument, SamConversionDescription>
     abstract val argumentsWithSuspendConversion: Map<KotlinCallArgument, UnwrappedType>
+    abstract val argumentsWithUnitConversion: Map<KotlinCallArgument, UnwrappedType>
     abstract val argumentsWithConstantConversion: Map<KotlinCallArgument, IntegerValueTypeConstant>
 }
 

compiler/resolution/src/org/jetbrains/kotlin/resolve/calls/model/ResolutionCandidate.kt

@@ -193,6 +193,7 @@ class MutableResolvedCallAtom(
     lateinit var argumentToCandidateParameter: Map<KotlinCallArgument, ValueParameterDescriptor>
     private var samAdapterMap: HashMap<KotlinCallArgument, SamConversionDescription>? = null
     private var suspendAdapterMap: HashMap<KotlinCallArgument, UnwrappedType>? = null
+    private var unitAdapterMap: HashMap<KotlinCallArgument, UnwrappedType>? = null
     private var signedUnsignedConstantConversions: HashMap<KotlinCallArgument, IntegerValueTypeConstant>? = null
 
     val hasSamConversion: Boolean
@@ -207,6 +208,9 @@ class MutableResolvedCallAtom(
     override val argumentsWithSuspendConversion: Map<KotlinCallArgument, UnwrappedType>
         get() = suspendAdapterMap ?: emptyMap()
 
+    override val argumentsWithUnitConversion: Map<KotlinCallArgument, UnwrappedType>
+        get() = unitAdapterMap ?: emptyMap()
+
     override val argumentsWithConstantConversion: Map<KotlinCallArgument, IntegerValueTypeConstant>
         get() = signedUnsignedConstantConversions ?: emptyMap()
 
@@ -224,6 +228,13 @@ class MutableResolvedCallAtom(
         suspendAdapterMap!![argument] = convertedType
     }
 
+    fun registerArgumentWithUnitConversion(argument: KotlinCallArgument, convertedType: UnwrappedType) {
+        if (unitAdapterMap == null)
+            unitAdapterMap = hashMapOf()
+
+        unitAdapterMap!![argument] = convertedType
+    }
+
     fun registerArgumentWithConstantConversion(argument: KotlinCallArgument, convertedConstant: IntegerValueTypeConstant) {
         if (signedUnsignedConstantConversions == null)
             signedUnsignedConstantConversions = hashMapOf()