From 19c28c55c54ec784f0cf2fdac92c085399438177 Mon Sep 17 00:00:00 2001
From: Leonid Startsev <leonid.startsev@jetbrains.com>
Date: Thu, 15 Aug 2019 16:11:18 +0300
Subject: [PATCH] Allow serialization plugin to work with inline types which
 are primitives (e.g. Char in JS IR)

---
 .../diagnostic/SerializationPluginDeclarationChecker.kt      | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/plugins/kotlin-serialization/kotlin-serialization-compiler/src/org/jetbrains/kotlinx/serialization/compiler/diagnostic/SerializationPluginDeclarationChecker.kt b/plugins/kotlin-serialization/kotlin-serialization-compiler/src/org/jetbrains/kotlinx/serialization/compiler/diagnostic/SerializationPluginDeclarationChecker.kt
index c58b349b9b3..43a373f770d 100644
--- a/plugins/kotlin-serialization/kotlin-serialization-compiler/src/org/jetbrains/kotlinx/serialization/compiler/diagnostic/SerializationPluginDeclarationChecker.kt
+++ b/plugins/kotlin-serialization/kotlin-serialization-compiler/src/org/jetbrains/kotlinx/serialization/compiler/diagnostic/SerializationPluginDeclarationChecker.kt
@@ -6,6 +6,7 @@
 package org.jetbrains.kotlinx.serialization.compiler.diagnostic
 
 import com.intellij.psi.PsiElement
+import org.jetbrains.kotlin.builtins.KotlinBuiltIns
 import org.jetbrains.kotlin.descriptors.*
 import org.jetbrains.kotlin.diagnostics.DiagnosticFactory0
 import org.jetbrains.kotlin.diagnostics.reportFromPlugin
@@ -190,6 +191,8 @@ open class SerializationPluginDeclarationChecker : DeclarationChecker {
         }
     }
 
+    private fun KotlinType.isUnsupportedInlineType() = isInlineClassType() && !KotlinBuiltIns.isPrimitiveTypeOrNullablePrimitiveType(this)
+
     private fun AbstractSerialGenerator.checkType(
         module: ModuleDescriptor,
         type: KotlinType,
@@ -199,7 +202,7 @@ open class SerializationPluginDeclarationChecker : DeclarationChecker {
     ) {
         if (type.genericIndex != null) return // type arguments always have serializer stored in class' field
         val element = ktType?.typeElement
-        if (type.isInlineClassType()) {
+        if (type.isUnsupportedInlineType()) {
             trace.reportFromPlugin(
                 SerializationErrors.INLINE_CLASSES_NOT_SUPPORTED.on(element ?: fallbackElement),
                 SerializationPluginErrorsRendering