Get rid of deprecated API and replacements (#1111)

Author: qwwdfsad

core/api/kotlinx-serialization-core.api

@@ -142,21 +142,6 @@ public annotation class Transient
 @ExperimentalSerializationApi
 public annotation class SerialInfo
 
-/**
- * Commands to use [ContextualSerializer] on an annotated property or type usage.
- * If used on a file, commands using [ContextualSerializer] for all listed KClasses.
- *
- * @param [forClasses] Classes to use ContextualSerializer for in the current file.
- */
-@Deprecated(
-    "This annotation had several meanings and was split in two for readability: use @Contextual on properties and @UseContextualSerialization on files.",
-    ReplaceWith("Contextual"),
-    level = DeprecationLevel.ERROR
-)
-@Target(AnnotationTarget.PROPERTY, AnnotationTarget.FILE, AnnotationTarget.TYPE)
-@Retention(AnnotationRetention.BINARY)
-public annotation class ContextualSerialization(vararg val forClasses: KClass<*>)
-
 /**
  * Instructs the plugin to use [ContextSerializer] on a given property or type.
  * Context serializer is usually used when serializer for type can only be found in runtime.

core/commonMain/src/kotlinx/serialization/Annotations.kt

@@ -63,6 +63,3 @@ public class ContextualSerializer<T : Any>(
         return decoder.decodeSerializableValue(serializer)
     }
 }
-
-@Deprecated("Renamed", ReplaceWith("ContextualSerializer"), level = DeprecationLevel.ERROR)
-public typealias ContextSerializer<T> = ContextualSerializer<T>

core/commonMain/src/kotlinx/serialization/ContextualSerializer.kt

@@ -7,7 +7,6 @@ package kotlinx.serialization
 import kotlinx.serialization.descriptors.*
 import kotlinx.serialization.descriptors.elementNames
 import kotlinx.serialization.encoding.*
-import kotlinx.serialization.encoding.updateModeDeprecated
 
 /**
  * KSerializer is responsible for the representation of a serial form of a type [T]
@@ -65,9 +64,6 @@ public interface KSerializer<T> : SerializationStrategy<T>, DeserializationStrat
      * to introspect the type, infer the schema or to compare against the predefined schema.
      */
     override val descriptor: SerialDescriptor
-
-    @Deprecated(patchDeprecated, level = DeprecationLevel.ERROR)
-    override fun patch(decoder: Decoder, old: T): T = throw UnsupportedOperationException("Not implemented, should not be called")
 }
 
 /**
@@ -177,20 +173,5 @@ public interface DeserializationStrategy<T> {
      * ```
      */
     public fun deserialize(decoder: Decoder): T
-
-    @Deprecated(patchDeprecated, level = DeprecationLevel.ERROR)
-    public fun patch(decoder: Decoder, old: T): T
-}
-
-// Can't be error yet because it's impossible to add default implementations for `val updateMode` in Decoder:
-// 'Class JsonDecoder must implement updateMode because it inherits it from multiple interfaces'
-// so users will have it in signature until we delete updateMode
-@Deprecated(updateModeDeprecated, level = DeprecationLevel.WARNING)
-@Suppress("NO_EXPLICIT_VISIBILITY_IN_API_MODE_WARNING")
-public enum class UpdateMode {
-    BANNED, OVERWRITE, UPDATE
 }
 
-internal const val patchDeprecated =
-    "Patch function is deprecated for removal since this functionality is no longer supported by serializer." +
-            "Some formats may provide implementation-specific patching in their Decoders."