1.3-M1

Language design

• KEEP-104 Inline classes
• KEEP-135 Unsigned integer types
• KEEP-95 Experimental API annotations
• KT-13762 Prohibit annotations with target 'EXPRESSION' and retention 'BINARY' or 'RUNTIME'
• KT-16681 kotlin allows mutating the field of read-only property
• KT-21515 Restrict visibility of classifiers, nested in companion objects

Compiler

• KT-24848 Refine loading Java overrides of Kotlin suspend functions
• KT-9580 Report an error if 'setparam' target does not make sense for a parameter declaration
• KT-16310 Nested classes inside enum entries capturing outer members
• KT-17981 Type parameter for catch parameter possible when exception is nested in generic, but fails in runtime
• KT-21354 Inconsistent behavior of 'for-in-range' loop if range is an array variable modified in loop body
• KT-25333 Restrict visibility of Java static members from supertypes of companion object
• KT-25623 Do not load experimental coroutines as non-suspend function with additional Continuation parameter

Backend. JVM

• KT-6301 Support JvmStatic annotation on interface companion object members
• KT-25508 Inject probeCoroutineSuspended to coroutines body
• KT-18987 Unroll recursion in CoroutineImpl.resume
• KT-11567 Companion object INSTANCE field more visible than companion object class itself
• KT-13764 Support lambdas and function references for arities bigger than 22
• KT-16615 Do not generate ConstantValue attribute for non-const vals
• KT-25193 Names of parameters from Java interface methods implemented by delegation are lost
• KT-25324 VerifyError “Bad type on operand stack” on running code with call of array iterator for array of inline classes
• KT-25325 CCE “Foo cannot be cast to java.lang.String” for iterating over the list of inline classes
• KT-25626 Inline class values inside string literals don't use their own toString implementation

Backend. JVM. Coroutines

• KT-20219 Inline suspend function can't be used as non-inline function
• KT-24863 Support new Continuation API in JVM BE
• KT-24864 Create new CoroutineImpl and other internal coroutines interfaces

Backend. JVM. Inline

• KT-25511 Inline classes fail with cross-inline functions

Binary Metadata

• KT-24617 Optional expected annotation is unresolved in a dependent platform module
• KT-25120 RequireKotlin on nested class and its members is not loaded correctly
• KT-25273 java.lang.UnsupportedOperationException from incremental JS compilation
• KT-25310 Write isUnsigned flag into metadata for unsigned types

Frontend

• KT-15807 @JvmField is not applicable to interface companion properties
• KT-16962 Annotation classes cannot contain types or static fields because they cannot have a body
• KT-23153 Compiler allows to set non constant value as annotation parameter
• KT-23362 Move coroutines to package kolin.coroutines for 1.3
• KT-24861 Fix loading kotlin.suspend compiled with LV=1.2 when release coroutines package is used
• KT-25241 Kotlin compiler doesn't warn about usage of lambda/reference with more than 22 parameters
• KT-25600 NSEE “Collection is empty” after trying to call default constructor of unsigned number class

Frontend. Data-flow analysis

• KT-22517 Deprecate smartcasts for local delegated properties

Frontend. Declarations

• KT-19618 Data class copy() call with optional parameters leads to broken code when the class implements an interface with copy()
• KT-23277 Prohibit local annotation classes
• KT-24197 Make 'mod' operator error in 1.3

Frontend. Lexer & Parser

• KT-24663 Add 'UL' suffix to represent number literals of unsigned Long type

Frontend. Resolution and Inference

• KT-16908 Support callable references to suspending functions
• KT-20588 Report error on single element assignment to varargs in named form in annotations
• KT-20589 Report error on single element assignment to varargs in named form in functions
• KT-24859 Disallow calls of functions annotated with receiver annotated with @RestrictsSuspension in foreign suspension context

IDE

• KT-25466 Make coroutines resolve to be independent of language and API versions set in Kotlin Compiler settings

IDE. Inspections and Intentions

• KT-24243 Support quick fix to enable usages of Experimental/UseExperimental
• KT-11154 Spell checking inspection is not suppressable
• KT-25169 Impossible to suppress UAST/JVM inspections

IDE. Libraries

• KT-25129 Idea freezes when Kotlin plugin tries to determine if jar is js lib in jvm module

Libraries

New Features

• KEEP-131, KT-17261 Add random number generator to stdlib and related collection extension functions
• KT-7922 Companion object for Boolean
• KT-8247 Byte size for primitives
• KT-16552 Add Sequence.orEmpty()
• KT-18559 Make SafeContinuation and context impl classes serializable
• KT-18910 StringBuilder#setLength(0) in non-JVM Kotlin
• KT-21763 Provide Char MIN_VALUE/MAX_VALUE constants
• KT-23279 isNullOrEmpty() for collections, maps, and arrays
• KT-23602 Make kotlin.Metadata public

Fixes

• KT-23564 KotlinJS: Math is deprecated yet random is not a global function
• KT-24856 Create compatibility wrappers for migration from 1.2 to 1.3 coroutines
• KT-24862 Create new Continuation API for coroutines

Reflection

• KT-25541 Incorrect parameter names in reflection for inner class constructor from Java class compiled with "-parameters"