FIR IDE: introduce KtCapturedType

idea/idea-frontend-api/src/org/jetbrains/kotlin/idea/frontend/api/types/KtType.kt

@@ -55,6 +55,8 @@ abstract class KtTypeParameterType : KtTypeWithNullability {
     abstract val symbol: KtTypeParameterSymbol
 }
 
+abstract class KtCapturedType : KtType
+
 abstract class KtFlexibleType : KtType {
     abstract val lowerBound: KtType
     abstract val upperBound: KtType

idea/idea-frontend-fir/src/org/jetbrains/kotlin/idea/frontend/api/fir/KtSymbolByFirBuilder.kt

@@ -320,6 +320,7 @@ internal class KtSymbolByFirBuilder private constructor(
                     is ConeFlexibleType -> KtFirFlexibleType(coneType, token, this@KtSymbolByFirBuilder)
                     is ConeIntersectionType -> KtFirIntersectionType(coneType, token, this@KtSymbolByFirBuilder)
                     is ConeDefinitelyNotNullType -> buildKtType(coneType.original)
+                    is ConeCapturedType -> KtFirCapturedType(coneType, token)
                     else -> throwUnexpectedElementError(coneType)
                 }
             }

idea/idea-frontend-fir/src/org/jetbrains/kotlin/idea/frontend/api/fir/types/FirKtType.kt

@@ -101,6 +101,15 @@ internal class KtFirClassErrorType(
     override fun asStringForDebugging(): String = withValidityAssertion { coneType.render() }
 }
 
+internal class KtFirCapturedType(
+    coneType: ConeCapturedType,
+    override val token: ValidityToken,
+) : KtCapturedType(), KtFirType {
+    override val coneType by weakRef(coneType)
+    override fun asStringForDebugging(): String = withValidityAssertion { coneType.render() }
+}
+
+
 internal class KtFirTypeParameterType(
     coneType: ConeTypeParameterType,
     override val token: ValidityToken,