[FIR] Transform qualified access / callable refs type arguments properly

compiler/fir/resolve/src/org/jetbrains/kotlin/fir/resolve/FirDoubleColonExpressionResolver.kt

@@ -14,10 +14,9 @@ import org.jetbrains.kotlin.fir.declarations.FirTypeAlias
 import org.jetbrains.kotlin.fir.declarations.expandedConeType
 import org.jetbrains.kotlin.fir.expressions.*
 import org.jetbrains.kotlin.fir.references.FirNamedReference
-import org.jetbrains.kotlin.fir.types.ConeKotlinType
-import org.jetbrains.kotlin.fir.types.ConeStarProjection
-import org.jetbrains.kotlin.fir.types.FirResolvedTypeRef
+import org.jetbrains.kotlin.fir.types.*
 import org.jetbrains.kotlin.fir.types.impl.ConeClassLikeTypeImpl
+import org.jetbrains.kotlin.types.Variance
 
 sealed class DoubleColonLHS(val type: ConeKotlinType) {
     /**
@@ -153,7 +152,22 @@ class FirDoubleColonExpressionResolver(
 
         val type = ConeClassLikeTypeImpl(
             firClass.symbol.toLookupTag(),
-            Array(firClass.typeParameters.size) { ConeStarProjection },
+            Array(firClass.typeParameters.size) { index ->
+                val typeArgument = expression.typeArguments.getOrNull(index)
+                if (typeArgument == null) ConeStarProjection
+                else when (typeArgument) {
+                    is FirTypeProjectionWithVariance -> {
+                        val coneType = typeArgument.typeRef.coneTypeSafe<ConeKotlinType>()
+                        if (coneType == null) ConeStarProjection
+                        else when (typeArgument.variance) {
+                            Variance.INVARIANT -> coneType
+                            Variance.IN_VARIANCE -> ConeKotlinTypeProjectionIn(coneType)
+                            Variance.OUT_VARIANCE -> ConeKotlinTypeProjectionOut(coneType)
+                        }
+                    }
+                    else -> ConeStarProjection
+                }
+            },
             isNullable = false // TODO: Use org.jetbrains.kotlin.psi.KtDoubleColonExpression.getHasQuestionMarks
         )
 

compiler/fir/resolve/src/org/jetbrains/kotlin/fir/resolve/transformers/body/resolve/FirExpressionsResolveTransformer.kt

@@ -64,6 +64,8 @@ class FirExpressionsResolveTransformer(transformer: FirBodyResolveTransformer) :
         data: ResolutionMode
     ): CompositeTransformResult<FirStatement> {
         qualifiedAccessExpression.annotations.forEach { it.accept(this, data) }
+        qualifiedAccessExpression.transformTypeArguments(transformer, ResolutionMode.ContextIndependent)
+
         var result = when (val callee = qualifiedAccessExpression.calleeReference) {
             is FirExplicitThisReference -> {
                 val labelName = callee.labelName

compiler/testData/diagnostics/tests/callableReference/function/genericClassFromTopLevel.fir.kt

@@ -9,5 +9,5 @@ class A<T>(val t: T) {
 fun bar() {
     val x = A<String>::foo
 
-    <!INAPPLICABLE_CANDIDATE!>checkSubtype<!><KFunction1<A<String>, String>>(x)
+    checkSubtype<KFunction1<A<String>, String>>(x)
 }

compiler/testData/diagnostics/tests/callableReference/property/genericClass.fir.kt

@@ -8,8 +8,8 @@ class A<T>(val t: T) {
 
 fun bar() {
     val x = A<String>::foo
-    <!INAPPLICABLE_CANDIDATE!>checkSubtype<!><KProperty1<A<String>, String>>(x)
-    <!INAPPLICABLE_CANDIDATE!>checkSubtype<!><KProperty1<A<String>, Any?>>(x)
+    checkSubtype<KProperty1<A<String>, String>>(x)
+    checkSubtype<KProperty1<A<String>, Any?>>(x)
 
     val y = A<*>::foo
     checkSubtype<KProperty1<A<*>, Any?>>(y)

compiler/testData/diagnostics/tests/inference/regressions/kt32862_both.fir.kt

@@ -12,5 +12,5 @@ fun <V, T : V?> G<T>.foo(vararg values: V2<V?>) = build()
 fun forReference(ref: Any?) {}
 
 fun test() {
-    <!INAPPLICABLE_CANDIDATE!>forReference<!>(<!UNRESOLVED_REFERENCE!>G<Int?>::foo<!>)
+    forReference(<!UNRESOLVED_REFERENCE!>G<Int?>::foo<!>)
 }

compiler/testData/ir/irText/expressions/callableReferences/genericMember.fir.txt

@@ -34,20 +34,20 @@ FILE fqName:<root> fileName:/genericMember.kt
         public open fun toString (): kotlin.String declared in kotlin.Any
       $this: VALUE_PARAMETER name:<this> type:kotlin.Any
   PROPERTY name:test1 visibility:public modality:FINAL [val]
-    FIELD PROPERTY_BACKING_FIELD name:test1 type:kotlin.reflect.KFunction1<<root>.A<*>, kotlin.Unit> visibility:private [final,static]
+    FIELD PROPERTY_BACKING_FIELD name:test1 type:kotlin.reflect.KFunction1<<root>.A<kotlin.String>, kotlin.Unit> visibility:private [final,static]
       EXPRESSION_BODY
-        FUNCTION_REFERENCE 'public final fun foo (): kotlin.Unit declared in <root>.A' type=kotlin.reflect.KFunction1<<root>.A<*>, kotlin.Unit> origin=null reflectionTarget=<same>
-    FUN DEFAULT_PROPERTY_ACCESSOR name:<get-test1> visibility:public modality:FINAL <> () returnType:kotlin.reflect.KFunction1<<root>.A<*>, kotlin.Unit>
+        FUNCTION_REFERENCE 'public final fun foo (): kotlin.Unit declared in <root>.A' type=kotlin.reflect.KFunction1<<root>.A<kotlin.String>, kotlin.Unit> origin=null reflectionTarget=<same>
+    FUN DEFAULT_PROPERTY_ACCESSOR name:<get-test1> visibility:public modality:FINAL <> () returnType:kotlin.reflect.KFunction1<<root>.A<kotlin.String>, kotlin.Unit>
       correspondingProperty: PROPERTY name:test1 visibility:public modality:FINAL [val]
       BLOCK_BODY
-        RETURN type=kotlin.Nothing from='public final fun <get-test1> (): kotlin.reflect.KFunction1<<root>.A<*>, kotlin.Unit> declared in <root>'
-          GET_FIELD 'FIELD PROPERTY_BACKING_FIELD name:test1 type:kotlin.reflect.KFunction1<<root>.A<*>, kotlin.Unit> visibility:private [final,static]' type=kotlin.reflect.KFunction1<<root>.A<*>, kotlin.Unit> origin=null
+        RETURN type=kotlin.Nothing from='public final fun <get-test1> (): kotlin.reflect.KFunction1<<root>.A<kotlin.String>, kotlin.Unit> declared in <root>'
+          GET_FIELD 'FIELD PROPERTY_BACKING_FIELD name:test1 type:kotlin.reflect.KFunction1<<root>.A<kotlin.String>, kotlin.Unit> visibility:private [final,static]' type=kotlin.reflect.KFunction1<<root>.A<kotlin.String>, kotlin.Unit> origin=null
   PROPERTY name:test2 visibility:public modality:FINAL [val]
-    FIELD PROPERTY_BACKING_FIELD name:test2 type:kotlin.reflect.KProperty1<<root>.A<*>, kotlin.Int> visibility:private [final,static]
+    FIELD PROPERTY_BACKING_FIELD name:test2 type:kotlin.reflect.KProperty1<<root>.A<kotlin.String>, kotlin.Int> visibility:private [final,static]
       EXPRESSION_BODY
-        PROPERTY_REFERENCE 'public final bar: kotlin.Int [val]' field='FIELD PROPERTY_BACKING_FIELD name:bar type:kotlin.Int visibility:private [final]' getter='public final fun <get-bar> (): kotlin.Int declared in <root>.A' setter=null type=kotlin.reflect.KProperty1<<root>.A<*>, kotlin.Int> origin=null
-    FUN DEFAULT_PROPERTY_ACCESSOR name:<get-test2> visibility:public modality:FINAL <> () returnType:kotlin.reflect.KProperty1<<root>.A<*>, kotlin.Int>
+        PROPERTY_REFERENCE 'public final bar: kotlin.Int [val]' field='FIELD PROPERTY_BACKING_FIELD name:bar type:kotlin.Int visibility:private [final]' getter='public final fun <get-bar> (): kotlin.Int declared in <root>.A' setter=null type=kotlin.reflect.KProperty1<<root>.A<kotlin.String>, kotlin.Int> origin=null
+    FUN DEFAULT_PROPERTY_ACCESSOR name:<get-test2> visibility:public modality:FINAL <> () returnType:kotlin.reflect.KProperty1<<root>.A<kotlin.String>, kotlin.Int>
       correspondingProperty: PROPERTY name:test2 visibility:public modality:FINAL [val]
       BLOCK_BODY
-        RETURN type=kotlin.Nothing from='public final fun <get-test2> (): kotlin.reflect.KProperty1<<root>.A<*>, kotlin.Int> declared in <root>'
-          GET_FIELD 'FIELD PROPERTY_BACKING_FIELD name:test2 type:kotlin.reflect.KProperty1<<root>.A<*>, kotlin.Int> visibility:private [final,static]' type=kotlin.reflect.KProperty1<<root>.A<*>, kotlin.Int> origin=null
+        RETURN type=kotlin.Nothing from='public final fun <get-test2> (): kotlin.reflect.KProperty1<<root>.A<kotlin.String>, kotlin.Int> declared in <root>'
+          GET_FIELD 'FIELD PROPERTY_BACKING_FIELD name:test2 type:kotlin.reflect.KProperty1<<root>.A<kotlin.String>, kotlin.Int> visibility:private [final,static]' type=kotlin.reflect.KProperty1<<root>.A<kotlin.String>, kotlin.Int> origin=null

compiler/testData/ir/irText/expressions/genericPropertyRef.fir.txt

@@ -68,7 +68,7 @@ FILE fqName:<root> fileName:/genericPropertyRef.kt
     FIELD DELEGATE name:additionalText$delegate type:<root>.DVal visibility:private [final,static]
       EXPRESSION_BODY
         CONSTRUCTOR_CALL 'public constructor <init> (kmember: kotlin.Any) [primary] declared in <root>.DVal' type=<root>.DVal origin=null
-          kmember: PROPERTY_REFERENCE 'public final text: kotlin.String? [var]' field='FIELD PROPERTY_BACKING_FIELD name:text type:kotlin.String? visibility:private' getter='public final fun <get-text> (): kotlin.String? declared in <root>.Value' setter='public final fun <set-text> (<set-?>: kotlin.String?): kotlin.Unit declared in <root>.Value' type=kotlin.reflect.KMutableProperty1<<root>.Value<*>, kotlin.String?> origin=null
+          kmember: PROPERTY_REFERENCE 'public final text: kotlin.String? [var]' field='FIELD PROPERTY_BACKING_FIELD name:text type:kotlin.String? visibility:private' getter='public final fun <get-text> (): kotlin.String? declared in <root>.Value' setter='public final fun <set-text> (<set-?>: kotlin.String?): kotlin.Unit declared in <root>.Value' type=kotlin.reflect.KMutableProperty1<<root>.Value<T of <uninitialized parent>>, kotlin.String?> origin=null
     FUN DELEGATED_PROPERTY_ACCESSOR name:<get-additionalText> visibility:public modality:FINAL <> () returnType:kotlin.Int
       correspondingProperty: PROPERTY name:additionalText visibility:public modality:FINAL [delegated,val]
       BLOCK_BODY
@@ -81,7 +81,7 @@ FILE fqName:<root> fileName:/genericPropertyRef.kt
     FIELD DELEGATE name:additionalValue$delegate type:<root>.DVal visibility:private [final,static]
       EXPRESSION_BODY
         CONSTRUCTOR_CALL 'public constructor <init> (kmember: kotlin.Any) [primary] declared in <root>.DVal' type=<root>.DVal origin=null
-          kmember: PROPERTY_REFERENCE 'public final value: kotlin.Any? [var]' field=null getter='public final fun <get-value> (): kotlin.Any? declared in <root>.Value' setter='public final fun <set-value> (<set-?>: kotlin.Any?): kotlin.Unit declared in <root>.Value' type=kotlin.reflect.KMutableProperty1<<root>.Value<*>, kotlin.Any?> origin=null
+          kmember: PROPERTY_REFERENCE 'public final value: T of <uninitialized parent> [var]' field=null getter='public final fun <get-value> (): T of <uninitialized parent> declared in <root>.Value' setter='public final fun <set-value> (<set-?>: T of <uninitialized parent>): kotlin.Unit declared in <root>.Value' type=kotlin.reflect.KMutableProperty1<<root>.Value<T of <uninitialized parent>>, T of <uninitialized parent>> origin=null
     FUN DELEGATED_PROPERTY_ACCESSOR name:<get-additionalValue> visibility:public modality:FINAL <> () returnType:kotlin.Int
       correspondingProperty: PROPERTY name:additionalValue visibility:public modality:FINAL [delegated,val]
       BLOCK_BODY