Kotlin 1.1-Beta

Reflection

• KT-15540 findAnnotation returns T?, but it throws NoSuchElementException when there is no matching annotation
• Reflection API in kotlin-reflect library is moved to kotlin.reflect.full package, declarations in the package kotlin.reflect are left deprecated. Please migrate according to the hints provided.

Compiler

Coroutine support

• KT-15379 Allow invoke on instances of suspend function type inside suspend function
• KT-15380 Support suspend function type with value parameters
• KT-15391 Prohibit suspend function type in supertype list
• KT-15392 Prohibit local suspending function
• KT-15413 Override regular functions with suspending ones and vice versa
• KT-15657 Refine dispatchResume convention
• KT-15662 Prohibit callable references to suspend functions

Diagnostics

• KT-9630 Cannot create extension function on intersection of types
• KT-11398 Possible false positive for INACCESSIBLE_TYPE
• KT-13593 Do not report USELESS_ELVIS_RIGHT_IS_NULL for left argument with platform type
• KT-13859 Wrong error about using unrepeatable annotation when mix implicit and explicit targets
• KT-14179 Prohibit to use enum entry as type parameter
• KT-15097 Inherited platform declarations clash: regression under 1.1 when indirectly inheriting from java.util.Map
• KT-15287 Kotlin runtime 1.1 and runtime 1.0.x: Overload resolution ambiguity
• KT-15334 Incorrect "val cannot be reassigned" inside do-while
• KT-15410 "Protected function call from public-API inline function" for protected constructor call

Kapt3

• KT-15145 Kapt3: Doesn't compile with multiple errors
• KT-15232 Kapt3 crash due to java codepage
• KT-15359 Kapt3 exception while annotation processing (DataBindings AS2.3-beta1)
• KT-15375 Kapt3 can't find ${env.JDK_18}/lib/tools.jar
• KT-15381 Unresolved references: R with Kapt3
• KT-15397 Kapt3 doesn't work with databinding
• KT-15409 Kapt3 Cannot find the getter for attribute 'android:text' with value type java.lang.String on android.widget.EditText.
• KT-15421 Kapt3: Substitute types from Psi instead of writing NonExistentClass for generated type names
• KT-15459 Kapt3 doesn't generate code in test module
• KT-15524 Kapt3 - Error messages should display associated element information (if available)
• KT-15713 Kapt3: circular dependencies between Gradke tasks

Exceptions / Errors

• KT-11401 Error type encountered for implicit invoke with function literal argument
• KT-12044 Assertion "Rewrite at slice LEXICAL_SCOPE" for 'if' with property references
• KT-14011 Compiler crash when inlining: lateinit property allRecapturedParameters has not been initialized
• KT-14868 CCE in runtime while converting Number to Char
• KT-15364 VerifyError: Bad type on operand stack on ObserverIterator.hasNext
• KT-15373 Internal error when running TestNG test
• KT-15437 VerifyError: Bad local variable type on simplest provideDelegate
• KT-15446 Property reference on an instance of subclass causes java.lang.VerifyError
• KT-15447 Compiler backend error: "Don't know how to generate outer expression for class"
• KT-15449 Back-end (JVM) Internal error: Couldn't inline method call
• KT-15464 Regression: "Supertypes of the following classes cannot be resolved. Please make sure you have the required dependencies in the classpath:"
• KT-15575 VerifyError: Bad type on operand stack

Various issues

• KT-11962 Super call with default parameters check is generated for top-level function
• KT-11969 ProGuard issue with private interface methods
• KT-12795 Write information about sealed class inheritors to metadata
• KT-13718 ClassFormatError on aspectj instrumentation
• KT-14162 Support @InlineOnly on inline properties
• KT-14705 Inconsistent smart casts on when enum subject
• KT-14917 No way to pass additional java command line options to kontlinc on Windows
• KT-15112 Compiler hangs on nested lock compilation
• KT-15225 Scripts: generate classes with names that are valid Java identifiers
• KT-15411 Unnecessary CHECKCAST bytecode when dealing with null
• KT-15473 Invalid KFunction byte code signature for callable references
• KT-15582 Generated bytecode is sometimes incompatible with Java 9
• KT-15584 Do not mark class files compiled with a release language version as pre-release
• KT-15589 Upper bound for T in KClass can be implicitly violated using generic function
• KT-15631 Compiler hang in MethodAnalyzer.analyze() fixed

JavaScript backend

Coroutine support

• KT-15362 JS: Regex doesn't work (properly) in coroutine
• KT-15366 JS: error when calling inline function with optional parameters from another module inside coroutine lambda
• KT-15367 JS: for against iterator with suspend next and hasNext functions does not work
• KT-15400 suspendCoroutine is missing in JS BE
• KT-15597 Support non-tail suspend calls inside named suspend functions
• KT-15625 JS: return statement without value surrounded by try..finally in suspend lambda causes compiler error
• KT-15698 Move coroutine intrinsics to kotlin.coroutine.intrinsics package

Diagnostics

• KT-14577 JS: do not report declaration clash when common redeclaration diagnostic applies
• KT-15136 JS: prohibit inheritance from kotlin Function{N} interfaces

Language features support

• KT-12194 Exhaustiveness check isn't generated for when expressions in JS at all
• KT-15590 Support increment on inlined properties

Native / external

• KT-8081 JS: native inherited class shouldn't require super or primary constructor call
• KT-13892 JS: restrictions for native (external) functions and properties
• KT-15307 JS: prohibit inline members inside external declarations
• KT-15308 JS: prohibit non-abstract members inside external interfaces except nullable properties (with accessors)

Exceptions / Errors

• KT-7302 KotlinJS - Trait with optional parameter causes compilation error
• KT-15325 JS: ReferenceError: $receiver is not defined
• KT-15357 JS: when expression in primary-from-secondary constructor call
• KT-15435 Call to 'synchronize' crashes JS backend
• KT-15513 JS: empty do..while loop crashes compiler

Various issues

• [KT-4160](https://youtrack.jetbra...

Kotlin 1.0.6

Compiler

• KT-12224 Add a diagnostic message for @JvmOverloads on interface methods
• KT-14186 Vararg parameters were generated as simple array parameters for Java
• KT-12664 Inner class was not found when a sub-directory with the same name is present in an outer class directory
• KT-14408 No-arg constructor should always be generated if all primary constuctor arguments have a default value
• KT-14469 StackOverflowError at EffectiveVisibilityKt.forVisibility
• KT-14581 NullPointerException at StackTransformationUtils when inlining extension function to a do-while loop condition
• KT-14678 Internal error with @JvmOverloads on constructor of inner class
• KT-14751 Class can't be resolved (related to annotation on types)
• KT-14774 Incorrect inner class modifier was generated for sealed inner classes

Stdlib

• KT-14883 Performance tune: Use byte array buffer directly to read the entire contents of a file

JS

• KT-12976 Print human-friendly error message on wrong modules order
• KT-13792 Inner class of local class did not capture the enclosing class properly
• KT-13912 NullPointerException at JsSourceGenerationVisitor when a Lambda with empty if block passed to inline function
• KT-14535 Fix broken modification of captured variables defined by a destructuring declaration
• KT-14752 Fix exception while typing @JsName annotation in editor
• Update JavaScript platform declarations (DOM, Events, etc) to latest spec
• Types that exist in runtime are now generated as abstract classes while non-existing types are now interfaces

IDE

• KT-14215 Show members of anonymous objects in File Structure window
• KT-14217 Support visibility filters in File Structure window
• Implement Kotlin facet
• KT-13811 Expose JVM target setting in IntelliJ IDEA plugin compiler configuration UI

Issues fixed

• KT-6535 "Go to Symbol" did not include Enum constants
• KT-10700 Run tests via Gradle does not work for Kotlin sources
• KT-12385 Closing quote was not automatically inserted when typing Char literal
• KT-12445 Fix IllegalStateException in the class chooser if Kotlin script file exists
• KT-13279 Deleting < in function call expression should delete matching >
• KT-13795 Escaped chars in char literals was not highlighted
• KT-14411 Code folding did not work in lambdas after some declatation
• KT-14585 ConvertJavaCopyPasteProcessor showed a dialog under write action
• KT-14741 Default JVM target was inferred to 1.8 for module with dependency on JDK 1.7
• KT-13354 Fix unstable resolve of value parameter types in IDE tests
• KT-13400 KDoc: Fully-qualified names were resolved incorrectly
• KT-13197 KDoc: Code completion should suggest relevant identifiers for reference-value tags
• KT-10665 KDoc: Do not show full KDoc popup on ctrl-hovering over declarations
• KT-13038 Quick doc: HTML entities in code blocks should be escaped
• KT-13389 Quick Doc: Hyperlinks to properties and functions did nothing
• KT-7739 Quick Doc: Type names in should be navigable
• KT-7995 Quick Doc: ReplaceWith value should be shown for deprecated elements
• KT-13197　Quick Doc: Markdown indented code blocks were not recognized
• KT-11032 Quick Doc: @sample was ignored
• KT-13699 Quick documentation should show supertype docs for overridden Java methods
• KT-14804 Avoid loading ast for decompiled files
• KT-5897 Pressing Enter after binary operations places the caret at the wrong indentation
• KT-10828 Support empty Unit function formatting on one line
• KT-15123 Do indent adjustment on the fly only for the first element in the line
• KT-15128 Do not assign type parameters from original proto if type is substituted with Any

Inspections, Intentions and Quickfixes

• KT-12095 Implement "Join Declaration and Assignment" intention
• KT-12701 Add a quickfix for @JvmOverloads on functions without default parameters, fix corresponding inspection range
• KT-14326 Implement Intention + Inspection to remove empty secondary constructor body
• KT-14521 Add Inspection to remove empty primary constructor
• KT-14569 Convert Property to Function Intention: Search occurrences using progress dialog
• KT-14501 Create from Usage: Support array access expressions/binary expressions with type mismatch errors
• KT-14500 Create from Usage: Suggest functional type based on the call with lambda argument and unresolved invoke()
• KT-13259 "Redundant if statement" inspection: report also assignments (as done for Java)
• KT-13393 Implement intention to convert function reference to lambda
• KT-12100 Add "Convert try-finally to use" intention
• KT-14459 Initialize with Constructor Parameter: Fix IDE freeze on properties in generic class
• KT-14044 Fix exception on deleting unused declaration in IDEA 2016.3
• KT-14019 Create from Usage: Support generation of abstract members for superclasses
• KT-14246 Intentions: Convert function type parameter to receiver
• KT-14246 Intentions: Convert function type receiver to parameter
• KT-14729 Implement "Add names to call arguments" intention
• KT-11760 Create from Usage: Support adding type parameters to the referenced type

Issues fixed

• KT-14396 "Remove redundant .let call" was not proposed for binary operations
• KT-14552 ChangeParameterTypeFix held a strong reference to PSI
• KT-14745 Fix KotlinNullPointerException in ConvertPrimaryConstructorToSecondary
• KT-14791 Fix incorrect "remove redundant .let" inspection for value with smart cast
• KT-14733 Fix incorrect intention to add out/in variance with inner classes
• KT-13777 Simplify condition intention should work in case booleanCond == true
• KT-14890 Inspection to remove curly braces from class definition should not trigger for nested classes followed by a secondary constructor
• KT-12633 Intention "Specify type explicitly" should offer all bounds for platform types
• KT-14100 Auto-import should suggest Enum constants
• KT-15087 Don't suggest something == true simplification for flexible types
• KT-14982 "Convert reference to lambda" worked incorrectly with static methods
• KT-14985 "Convert reference to lambda" worked incorrectly with apply
• KT-15028 Fix ClassCastException: KtParameter cannot be cast to KtFunction
• KT-14063 N...

1.1-M04

1.1-M04 (EAP-4)

Language related changes

• KT-4481 compareTo on primitive floats/doubles should behave naturally
• KT-11016 Allow to annotate internal API to be used inside public inline functions
• KT-11128 Member vs SAM conversion with more specific signature
• KT-12215 Allowing to access protected members in public inline members creates potential binary compatibility problem
• KT-12531 Report error when delegated member hides a supertype member
• KT-14650 mod function on integral types is inconsistent with BigInteger.mod
• KT-14651 Floating point comparisons shall operate according to IEEE754
• KT-14852 It should not be possible to use typealias that abbreviates a generic projection as a constructor
• KT-15226 Restrict delegation to java 8 default methods

Reflection

• KT-12250 Provide API for getting a single annotation by its class
• KT-14939 VerifyError in accessors for bound property reference with receiver 'null'

Compiler

Coroutines

• Major coroutines redesign - see KEEP for details

Optimizations

• KT-11734 Optimize const vals by inlining them at call site
• KT-13570 Generate TABLE/LOOKUPSWITCH if all when branches are const integer values
• KT-14746 Captured Refs should not be volatile

Various issues

• KT-10982 java.util.Map::compute* poor usability
• KT-12144 Type inference incorporation error on SAM adapter call
• KT-14196 Do not allow class literal with expression in annotation arguments
• KT-14453 Regression: Type inference failed: inferred type is T but T was expected
• KT-14774 Incorrect inner class modifier generated for sealed inner classes
• KT-14839 CompilationException when calling inline fun with first arg of 2 (w/defaults) within catch block of Java exception type
• KT-14855 Projection in type aliases should be allowed in supertypes and constructor invocations if they expand to non-toplevel projections
• KT-14887 Unhelpful error "public-API inline function cannot access non-public-API" for unresolved call inside inline function
• KT-14930 Android: creating Kotlin activity: UOE at EmptyList.removeAll()
• KT-15146 Kapt3 no source files on unittest
• KT-15272 Exception when building 2 projects at the same time

JavaScript backend

dynamic type

• KT-8207 Extension function on dynamic resolves on any type
• KT-6579 JS: prohibit to use in and !in on dynamic
• KT-6580 JS: prohibit to use more than one argument in indexed access on dynamic
• KT-13615 JS: don't generate guard for catch with dynamic type

@native/external

• KT-13893 JS: Replace @Native annotation with external modifier
• KT-12877 Allow to specify module for native JS declarations
• KT-14806 JS: name of a local variable clashes with native declaration from global scope

Diagnostics

• KT-13889 JS: prohibit overriding native functions with default values assigned to parameters
• KT-13894 JS: prohibit native declaration inside non-native
• KT-13895 JS: RUNTIME annotations
• KT-13896 JS: prohibit external(native) extension functions and properties
• KT-13897 JS: prohibit native(external) files and typealiases
• KT-13910 JS: prohibit override members of native declaration with overloads
• KT-14027 JS: prohibit native inner classes
• KT-14029 JS: prohibit private members inside native declarations
• KT-14037 JS: prohibit using native interfaces in RHS of IS
• KT-14038 JS: warn when using native interface in RHS of AS
• KT-15130 JS: prohibit inheritance native from non-native
• KT-12600 JS: type check with a native interface compiles but crash at runtime
• KT-13307 KotlinJS cannot cast to a marker interface.

Language features support

• KT-13573 JS: support bound callable reference
• KT-14634 JS: support enumValues / enumValueOf
• KT-15058 JS: replace suspend function convention

Issues related to kotlin.Any

• KT-7664 JS: "x is Any" is always false
• KT-7665 JS: creating Any instance crashes on runtime
• KT-15131 JS: don't mangle Any.equals

Various issues

• KT-14033 JS: don't optimize (based on type information) by default expressions with any of "as, is, !is, as?, ?., !!"
• KT-13616 JS: don't omit guard for catch with Throwable type
• KT-12976 JS: human-friendly error message on wrong modules order
• KT-15212 JS: link unqualified names in js(...) function to local functions in outer Kotlin function by name
• KT-14750 JS: remove unnecessary functions from kotlin.js

Bugfixes

• KT-12566 JS: inner local class should refer to captured variables via its outer class
• KT-12527 Reified is-check works wrongly for chained calls
• KT-12586 JS: compiler crashes when call inline function inside string templeate
• KT-13164 Ecma TypeError on extending local class from inner one
• KT-14888 JS: Compiler error: Cannot get FQ name of local class: lazy class
• KT-14748 JS: eliminate unused functions
• KT-14999 JS: Operator set + labeled lambdas
• KT-15007 JS: Dies when checking if exception implements interface. TypeError: Cannot read property 'baseClasses' of undefined
• KT-15073 KT to JS losing extension function's receiver
• KT-15169 JS: compiler fails on annotated expression with TRE at Translation.doTranslateExpression()
• KT-13522 JS: can't use captured reified type paramter in jsClass
• KT-13784 JS: lambda was not inlined for function with reified parameter declared in another module
• KT-13792 JS: inner class of local class does not capture enclosing class properly
• KT-15327 JS: Enum valueOf should throw IllegalArgumentException

Standard library

• KT-7930 Make String.toInt(), toLong(), etc. nullable instead of throwing exception
• KT-8220 Add #peek method to Sequence similar to Stream.peek
• KT-8286 Int.toString and String.toInt with base as parameter
• KT-14034 JS: unsafeCast function
• KT-15181 Some source files are missing from published sources on Bintray

IDE

• KT-14693 Introduce Type Alias: Do not suggest type qualifiers
• KT-14696 Introduce Type Alias: Fix NPE during dialog repaint
• [`KT-14685...

1.1-M03

1.1-M03 (EAP-3)

New language features

• KT-2964 Underscores in integer literals
  (see KEEP)
• KT-3824 Underscore in lambda for unused parameters
  (see KEEP)
• KT-2783 Allow to skip some components in a multi-declaration
  (see the same KEEP)
• KT-11551 limited scope for dsl writers
  (see KEEP)

Compiler

Coroutines related issues

• Make fields for storing lambda parameters non-final (as they get assigned within invoke call)
• KT-14719 Make initial continuation able to be resumed with exception
• KT-14636 Coroutine fields should not be volatile
• KT-14718 Validate label value of coroutine in case of no suspension points

Typealises related issues

• KT-13514 Type inference doesn't work with generic typealiases
• KT-13837 Error "Type alias expands to T, which is not a class, an interface, or an object"
  should also appear for local type aliases
• KT-14307 Local recursive type alias should be an error
• KT-14400 Compiler Error IllegalStateException: kotlin.NotImplementedError when anonymous
  object inherits from typealias
• KT-14377 Expected error: Modifier 'companion' is not applicable to 'typealias'
• KT-14498 typealias allows to circumvent variance annotations
• KT-14641 An exception while processing a nested type alias access after a dot

Various issues

• KT-550 Properties without initializer but with get must infer type from getter
• KT-8816 Generate Kotlin parameter names in the same form as expected for Java 8 reflection
• KT-10569 Cannot iterate over values of an enum class when it is used as a generic parameter
  (see KEEP)
• KT-13557 VerifyError with delegated local variable used in object expression
• KT-13890 IllegalAccessError when invoking protected method with default arguments
• KT-14012 Back-end (JVM) Internal error every first compilation after the source code change
• KT-14201 UnsupportedOperationException: Don't know how to generate outer expression for anonymous
  object with invoke and non-trivial closure
• KT-14318 Repeated annotations resulting from type alias expansion should be reported
• KT-14347 Report UNUSED_PARAMETER/VARIABLE on named unused lambda parameters/destructuring entries
• KT-14352 @SinceKotlin is not taken into account for companion object member referenced via
  type alias
• KT-14357 Try-catch used in false condition generates CompilationException
• KT-14502 Prohibit irrelevant modifiers and annotations on destructured parameters in lambda
• KT-14692 Change resolution scope for componentX in lambda parameters
• KT-14824 Back-end (JVM) Internal error: Couldn't inline method call 'get' into local final fun
  StorageComponentContainer.(): kotlin.Unit
• KT-14798 Gradle 3.2 AssertionError: Built-in class kotlin.ParameterName is not found

JS

Feature support

• KT-6985 Support Exceptions in JS
• KT-13574 JS: support coroutines
• KT-14422 JS: Support destructuring in lambda parameters
• KT-14507 JS: allow to skip some components in a multi-declaration

Library updates

• KT-14637 JS: Missing ArrayList.ensureCapacity

Other issues

• KT-2328 js: kotlin exceptions must inherit Error
• KT-5537 Drop Cloneable in JS
• KT-7014 JS: generate code which more friendly to js tools (minifier, optimizer, linter etc)
• KT-8019 JS: no stackTrace in exception subclasses
• KT-10911 JS: Throwable properties aren't supported well
• KT-13912 JS: Compiler NPE at JsSourceGenerationVisitor. Lambda with empty [if] block passed
  to inline function
• KT-14535 JS: Broken modification of captured variables defined by a destructuring declaration

Standard Library

• KT-2084 Common API should be available without referring to java.* packages

  Now those common types, which are supported on all platforms, are available in kotlin.* packages, and are imported by default. These include:

  • ArrayList, HashSet, LinkedHashSet, HashMap, LinkedHashMap in kotlin.collections
  • Appendable and StringBuilder in kotlin.text
  • Comparator in kotlin.comparisons
    On JVM these are just typealiases of the good old types from java.util and java.lang

• KT-13554 Introduce bitwise operations and/or/xor/inv for Byte and Short

• KT-13582 New platform-agnostic extensions for arrays: contentEquals to compare arrays'
  content for equality, contentHashCode to get hashcode of array's content, and contentToString to get the string representation of array elements.

• KT-14510 Generic constraints of Array.flatten signature were relaxed a bit to make it just usable.

• KT-14789 Provide KotlinVersion class, which allows to get the current version of the standard
  library and compare it with some other KotlinVersion value.

IDE

• KT-14409 Incorrect "Variable can be declared immutable" inspection for local delegated variable
• KT-14431 Create quick-fix on UNUSED_PARAMETER/VARIABLE when it can be replaced with one underscore
• KT-14794 Add /Specify type/Remove explicit type intentions for property with getters if type
  can be inferred
• KT-14752 Exception while typing @JsName annotation in editor

Previous releases

This release also includes the fixes and improvements from releases 1.0.5-2, 1.1-M01 and 1.1-M02

1.0.5-2

• Fixed compatibility with Android Studio 2.3 Canary
• KT-14751 Fixed inability to resolve references to Java classes with type annotations on inner class or enum constructor parameters
• KT-14752 Fixed error when analyzing incomplete @JsName annotation
• KT-14724 Kotlin code compiled to JavaScript with Gradle calls main function by default

1.0.5

Compiler

• KT-10210 Annotation written before a block-level expression now applies to the entire expression, not to its first prefix
• KT-13565 Remove net/sf/cglib/core/* classes from compiler jars
• KT-2787 Set reference target and report custom error instead unresolved reference for cases:
  interface, generic parameter, object + invoke, class without companion.
• KT-13408 Fix decompilation of types based on local classifiers
• KT-13730 Fix signature clash problems when extending Hashtable and similar classes
• Support for property reference inlining
• KT-11123 Fix implicit type arguments resolution for inner classes
• KT-11263 Refine diagnostic about type arguments for an outer class
• KT-12238, KT-10627 Fix inference when captured type is used as a lambda parameter type
• KT-13950 Fix false positive "Cannot capture" error reporting
• KT-13381, KT-13396 Prevent generation of delegations to interfaces private methods
• KT-13295 Add warning for redundant lateinit modifier
• KT-13952, KT-13005 Prohibit return type mismatch for delegation members
• KT-8154 Fix AssertionError when delegating base interface and implementing derived interface
• KT-13969 Fix VerifyError for do-while, continue and a condition in a local variable
• KT-14025 Fix CCE in OverloadResolver.findRedeclarations
• KT-14147 Report error on declaring 'getClass' in class or package
• KT-14146 Fix detection of accidental overrides with synthetic bridge
• KT-14188 Do not generate mutable collection stubs for Kotlin-only signatures
• KT-14195 Write generic signature for autogenerated toArray
• KT-13698 Optimize method count for collection stubs
• KT-14243 Fix wrong invocation descriptor on calling implicitly generated implementation in class
• KT-11585 Fix "Cannot pop operand off an empty stack" exception when accessing @JvmStatic property
• KT-14242 Fix runtime exception on array?.size
• Forbid use of expressions to the left of ::class
• KT-13926 Report error on usages of classes deprecated with DeprecationLevel.HIDDEN
• KT-14298 Add -api-version command line option
• KT-5044 Generate more efficient bytecode for in on ranges with double, float and long element type
• KT-14357 Fixed CompilationException in case of try-catch used in false condition
• KT-14012 Fixed internal error on every first compilation after the source code change
• KT-14304 Fixed inconsistent reporting of 'variable must be initialized' after assignment
  in anonymous object
• KT-14158 Fixed possible exception thrown when reporting unreachable code diagnostics
• KT-7929, KT-8442 Fixed various exceptions caused by trying to use destructuring declarations outside of a code block
• KT-14447 Fixed compiler exception if a value was changed but not used
• KT-14201 Fixed compiler exception for anonymous object with invoke and non-trivial closure
• KT-13890 Fixed incorrect bytecode generation causing IllegalAccessError at runtime for invoking protected method with default arguments
• KT-9297 Report "External declaration cannot be abstract" on property with external accessor

Reflection

• Various runtime performance optimizations
• KT-13700 Fix reflective access on overridden generic property reference

IDE

• KT-12852 Support breadcrumbs for Kotlin
• KT-13474 Fix performance of typing super call lambda
• Re-highlight only single function after local modifications
• Show "Variables and values captured in a closure" highlighting only for usages
• KT-9125 Support Type Hierarchy on references inside of super type call entries
• KT-13838 Add file name to the presentation of private top-level declaration (Go to symbol, etc.)
• KT-12697 Expand selection selects ": Type"
• KT-13693 Expand selection stops on brackets in indexing expression
• KT-4519 Show first line for folded block comments
• KT-5193 Multiline strings are now foldable
• KT-13473 Structure view now shows local functions
• KT-11775 Added icons for class initializers
• KT-11776 Primary constructor members are shown in Project view when "Show members" is enabled
• KT-13326 Speed search is now enabled in add import popup
• KT-3363 Support "Surround with if" for expressions
• KT-13927 exception Fixed on adding second inner class when there is a usage in Java of the first one
• KT-9009 Support for auto-import of Java static methods
• Improved performance for Find Usages of convention functions
• KT-13643 Support for Find Usages of invoke operator method
• KT-13605 Find Usages no longer fails to find usages of component function defined in Java
• KT-13953 Import member popup no longer suggests methods when only property or variable is valid
• KT-9019, KT-10178 Improved display of structure when "Group by file structure" is enabled
• KT-13475 Show context when invoking Show Implementations from Find Usages popup
• KT-13140 "Copy Reference" now copies JVM name of class or method to clipboard
• KT-10095 Support "Show expression type" in variable declaration position
• KT-10588 Show smart cast information in "Show expression type"
• KT-11310, KT-8803 Use short names in Show Expression Type
• KT-11640 Optimize imports prevents accidental changes in resolve because of import priorities
• KT-13976 Search Everywhere: Render function parameter types
• KT-13977 Search Everywhere: Render extension type in prefix position
• KT-12966 Fixed possible deadlock in IDE
• KT-13136 Reduced plugin memory usage on projects with large number of modules
• KT-13861 Correct Parameter Info for SAM adapters
• KT-13981, KT-5117 Add indent before colon of super types list on new line
• KT-7718 Fixed indent in constructor delegate call
• KT-13584 Fixed IDE misbehavior (exceptions, index corruption) after Java to Kotlin conversion
• KT-12402 Fixed resolve of databinding
  classes inside the IDE
• KT-14131 Formatter now removes spaces in labeled expressions
• KT-14327 Allow to select single word on double click in one line doc comment
• [KT-14452](https://youtrack.jetbrains.com/issue/KT-14452...

Kotlin 1.1 M02 (Early Access Preview)

Language features

• Destructuring for lambdas (proposal)

  Current limitations:

  • Nested destructuring is not supported
  • Destructuring in named functions/constructors is not supported
  • Is not supported for JS target

Compiler

Smart cast enhancements

• KT-2127 Smart cast receiver to not null after a not null safe call
• KT-6840 Make data flow information the same for assigned and assignee
• KT-13426 Fix exception when smartcast on both dispatch & extension receiver

Bound references related issues

• KT-12995 Do not skip generation of the left-hand side for intrinsic bound references and class literals
• KT-13075 Fix codegen for bound class reference
• KT-13110 Fix type mismatch error on class literal with integer receiver expression
• KT-13172 Report error on "this::class" in super constructor call
• KT-13271 Fix incorrect unsupported error on synthetic extension call on LHS of ::
• KT-13367 Inline bound callable reference if it's used only as a lambda

Coroutines related issues

• KT-13156 Do not execute last Unit-typed coroutine statement twice
• KT-13246 Fix VerifyError with coroutines on Dalvik
• KT-13289 Fix VerifyError with coroutines: Bad type on operand stack
• KT-13409 Fix generic variable spilling with coroutines
• KT-13531 Fix ClassCastException when coercion to Unit interacts with generic await() and coroutines
• Prohibit Continuation<*> as a last parameter of suspend functions
• KT-13560 Prohibit non-Unit suspend functions

Typealises related issues

• KT-13200 Fix incorrect number of required type arguments reported on typealias
• KT-13181 Fix unresolved reference for a type alias from a different module
• KT-13161 Support java static methods calls with typealiases
• KT-13835 Do not lose nullability information while expanding type alias in projection position
• KT-13422 Prohibit usage of type alias to exception class as an object in 'throw' expression
• KT-13735 Fix NoSuchMethodError for generic typealias access
• KT-13513 Support SAM constructors for aliased java functional types
• KT-13822 Fix exception for start-projection of a type alias
• KT-14071 Prohibit using type alias as a qualifier for super
• KT-14282 Report error on unused type alias with -language-version 1.0
• KT-14274 Fix type alias resolution when it's used for supertype constructor call

JDK dependent built-in classes related issues

• KT-13209 Change first parameter's type of Map.getOrDefault to K instead of Any
• KT-13069 Do not emit invalid DefaultImpls delegation when interface extends MutableMap with JDK8

data classes and inheritance

• KT-11306 Allow data classes to implement equals/hashCode/toString from base classes

Various JVM code generation issues

• KT-13182 Fix compiler internal error at inline
• KT-13757 Prohibit referencing nested classes by name with $
• KT-12985 Do not create range instances for 'for' loop in CharSequence.indices
• KT-13931 Optimize generated code for IntRange#contains

Various analysis & diagnostic issues

• KT-435 Use parameter names in error messages when calling a function-valued expression
• KT-10001 Fix false unnecessary non-null assertion on a pair element
• KT-12811 Treat function declaration as final if it is a member of a final class
• KT-13961 Report REDECLARATION on private-in-file 'foo' vs public 'foo' in different file

JS

Feature support

• KT-13544 Support type aliases in JS
• KT-13345 Support class literals in JS

Library updates

• KT-18 Move exceptions from java.lang to kotlin package
• KT-12386 Rewrite JS collections in Kotlin, move them to kotlin.collections package
• KT-7809 Make Collection implementations conform to their declared interfaces
• KT-7473 Make AbstractCollection.equals check object type
• KT-13429 Make 'remove' on fresh iterator throw exception instead of removing last element
• KT-13459 Make JS implementation of ArrayList::add(index, element) check the index is in valid range
• KT-8724 Fix MutableIterator.remove() for HashMap
• KT-10786 Make Map.keys return view of map keys instead of snapshot
• KT-14194 Make HashMap.putAll implementation not to call getKey/getValue

Standard Library

Backward compatibility

• KT-14297 Add @SinceKotlin annotation to support compatibility with compilation against older standard library
• KT-14213 Ensure printStackTrace can be called with -language-version 1.0

Enhancements

• KEEP-53 Provide two distinct hierarchies of abstract collections: one for implementing read-only/immutable collections, and other for implementing mutable collections
• KEEP-13 Provide extension functions to copy maps
• KT-18 Introduce type aliases for common exceptions from java.lang in kotlin package
• KT-12762 Make kotlin.ranges.until return an empty range for "illegal" 'to' parameter
• KT-12894 Allow nullable receiver for use extension

Reflection

New features

• KT-8998 Introduce comprehensive API to work with KType instances
• KT-10447 Provide a way to check if a KClass is a data class
• KT-11284 Add KClass.cast extension
• KT-13106 Support annotation constructors in reflection

Optimizations

• KT-10651 Optimize KClass.simpleName

IDE

New features

• KT-12903 Implement "Inline type alias" refactoring
• KT-12902 Implement "Introduce type alias" refactoring
• KT-12904 Implement "Create type alias from usage" quick fix
• KT-9016 Make use of named higher order function parameters
• KT-12205 Suggest import of Kotlin static members in editor with Java source
• KT-13941 Implement intention for introducing destructured lambda parameters when it's possible
• KT-13943 Implement inspection and quickfix for to detect a manual destructuring of for / lambda parameter

Issues fixed

• KT-13004 Support bound method references in completion
• KT-13242 Suggest 'typealias' keyword in completion
• KT-13244 Override/Implement Members: Do not expand type aliases in the generated members
• KT-13611 Go to Class: Fix presentation of type aliases
• KT-13759 Rename: Process object-wrapping alias references
• KT-13955 Find Usages: Add special type for usages inside of type aliases
• [`KT-13...

1.0.4

Compiler

Analysis & diagnostics

• KT-10968, KT-11075, KT-12286 Type inference of callable references
• KT-11892 Report error on qualified super call to a supertype extended by a different supertype
• KT-12875 Report error on incorrect call of member extension invoke
• KT-12847 Report error on accessing protected property setter from super class' companion
• KT-12322 Overload resolution ambiguity with constructor reference when class has a companion object
• KT-11440 Overload resolution ambiguity on specialized Map.put implementation from Java
• KT-11389 Runtime exception when calling Java primitive overloadings
• KT-8200 Exception when using non-generic interface with generic arguments
• KT-10237 Exception on an unresolved symbol in a type parameter bound in the 'where' clause
• KT-11821 Exception on incorrect number of generic arguments in a type parameter bound in the 'where' clause
• KT-12482 Exception: Implementation doesn't have the most specific type, but none of the other overridden methods does either
• KT-12687 Exception when 'data' modifier is applied to object
• KT-9620 AssertionError in DescriptorResolver#checkBounds
• KT-3689 IllegalAccess on a property with private setter of the subclass
• KT-6391 Wrong warning for array casting (Array<Any?> to Array)
• KT-8596 Exception when analyzing nested class constructor reference in an argument position
• KT-12982 Incorrect type inference when accessing mutable protected property via reflection
• KT-13206 Report "Cast never succeeds" if and only if ClassCastException can be predicted
• KT-12467 IllegalStateException: Concrete fake override should have exactly one concrete super-declaration: []
• KT-13340 Report "return is not allowed here" only on the return keyword, not the whole expression
• KT-2349, KT-6054 Report "uninitialized enum entry" if enum entry is referenced before its declaration
• KT-12809 Report "uninitialized variable" if property is referenced before its declaration
• KT-260 Do not report "cast never succeeds" when casting nullable to nullable
• KT-11769 Prohibit access from enum instance initialization code to members of enum's companion object
• KT-13371 Fix CompilationException: Rewrite at slice LEAKING_THIS key: REFERENCE_EXPRESSION
• KT-13401 Fix StackOverflowError when checking variance
• KT-13330, KT-13349 Fix AssertionError: Illegal resolved call to variable with invoke
• KT-13421 Fix AssertionError: Only integer constants should be checked for overflow
• KT-13555 Fix internal error "resolveToInstruction"
• KT-8989 Change error messages: Replace "invisible_fake" with "invisible (private in a supertype)"
• KT-13612 Val reassignment in try / catch
• KT-5469 Incorrect "is never used" warning for value used in catch block
• KT-13510 Missing "Nested class not allowed" error for anonymous object inside val initializer
• KT-13685 Fix NPE when resolving callable references on incomplete code
• Change error messages: Fix quotes around keywords in diagnostic messages
• Change error messages: Remove quotes around visibilities

Parser

• KT-7118 Improve error message after trailing dot in floating point literal
• KT-4948 Recover by following keyword
• KT-7915 Recover after val with no subsequent name
• KT-12987 Recover after val with no name before declaration starting with soft keyword

JVM code generation

• KT-12909 Do not generate redundant bridge for special built-in override
• KT-11915 Exception in entrySet when Map implementation in Kotlin extends another one
• KT-12755 Exception on property generation in multi-file classes
• KT-12983 VerifyError: Bad type on operand stack in arraylength
• KT-12908 Variable initialization in loop causes VerifyError: Bad local variable type
• KT-13040 Invalid bytecode generated for extension lambda invocation with safe call
• KT-13023 Char operations throw ClassCastException for boxed Chars
• KT-11634 Exception for super call in delegation
• KT-12359 Redundant stubs are generated on inheriting from java.util.Collection
• KT-11833 Error generating constructors of class on anonymous object inheriting from nested class of super class
• KT-13133 Incorrect InnerClasses attribute value for anonymous object copied from an inline function
• KT-13241 Indices optimization leads to VerifyError with smart cast receiver
• KT-13374 Fix compiler exception when inline function contains anonymous object implementing an interface by delegation

Generated code performance

• KT-11964 No TABLESWITCH in when on enum bytecode if enum constant is imported
• KT-6916 Optimize 'for' over 'downTo'
• KT-12733 Optimize 'for' over 'rangeTo' as a non-qualified call

Standard Library

• KT-13115, KT-13297 Improve documentation formatting, clarify documentation for FileTreeWalk, Sequence and generateSequence.
• KT-12894 Do not fail in Closeable.use if the resource is null.

Reflection

• KT-12915 Runtime exception on callBy of JvmStatic function with default arguments
• KT-12967 Runtime exception on reference to generic property
• KT-13370 NullPointerException on companionObjectInstance of a built-in class
• KT-13462 Make KClass for primitive type equal to the corresponding KClass for wrapper type

IDE

• KT-12655 New Kotlin file: extra error message for already existing file
• KT-12760 Prohibit running non-Unit returning main function
• KT-12893 Impossible to open Kotlin compiler settings
• KT-10433 Copy-pasting reference to companion object member causes import dialog
• KT-12803 Class is marked as unused when it is only used is in method reference
• KT-13084 Run test method action executes all tests from same kotlin file
• KT-12718 Deadlock due to index reentering
• KT-13114 'Unused declaration' option 'JUnit static methods' is always enabled
• KT-12997 Override/Implement Members: Support "Copy JavaDoc" options for library classes
• KT-12887 "Extend selection" should select call's invoked expression
• KT-13383, KT-13379 Override/Implement Members: Do not make return type non-nullable if base return type is explicitly nullable
• [KT-13218](https:/...

Kotlin 1.1 M01 (Early Access Preview)

Language features

• Coroutines (async/await, generators) (proposal)

  Current limitations:

  • for some cases type inference is not supported yet
  • limited IDE support
  • allowed only one handleResult function: design
  • handling finally blocks is not supported: issue

• Bound callable references (proposal)

• Type aliases (proposal)

  Current limitations:

  • type alias constructors for inner classes are not supported yet
  • annotations on type alias are not supported yet
  • limited IDE support

• Local delegated properties (proposal)

• JDK dependent built-in classes (proposal)

• Sealed class inheritors in the same file (proposal)

• Allow base classes for data classes (proposal)

Scripting

• Implement support for Script Definition Template
  and related functionality, except the following parts:
  • automatic script templates discovery is not implemented
  • @file:ScriptTemplate annotation is not supported
  • the parameters javaHome and scripts from KotlinScriptExternalDependencies are not used yet
• Implement support for custom template-based scripts in IDEA: resolving, completion and navigation to symbols from script classpath and sources
• Implement GradleScriptTemplateProvider extension that supplies a script template if gradle with
  kotlin script support is used in the project

Compiler

Issues fixed

• KT-4779 Generate default methods for implementations in interfaces
• KT-11780 Fixed incorrect "No cast needed" warning
• KT-12156 Fixed incorrect error on inline modifier inside final class
• KT-12358 Report missing error "Abstract member not implemented" when a fake method of 'Any' is inherited from an interface
• KT-6206 Generate equals/hashCode/toString in data class always unless it'll cause a JVM signature clash error
• KT-8990 Fixed incorrect error "virtual member hidden" for a private method of an inner class
• KT-12429 Fixed visibility checks for annotation usage on top-level declarations
• KT-5068 Introduced a special diagnostic message for "type mismatch" errors such as fun f(): Int = { 1 }.

Standard Library

• KT-8254 Provide standard library supplement artifacts for using with JDK 7 and 8.
  These artifacts include extensions for the types available in the latter JDKs, such as AutoCloseable.use (KT-5899) or Stream.toList.
• KT-12753 Provide an access to named group matches of Regex match result (for JDK 8 only).
• Add assertFails overload with message to kotlin-test.

IDE

New features

• "Leaking this" inspection

  This inspection reports dangerous operations inside constructors including:

  • Accessing non-final property in constructor
  • Calling non-final function in constructor
  • Using 'this' as function argument in constructor of non-final class

Issues fixed

• KT-12389 Do not exit from REPL when toString() of user class throws an exception
• KT-12129 Fixed link on api reference page in KDoc

1.0.3

Compiler

Analysis & diagnostics

• Combination of open and override is no longer a warning
• KT-4829 Equal conditions in when is now a warning
• KT-6611 "This cast can never succeed" warning is no longer reported for Foo<T> as Foo<Any>
• KT-7174 Declaring members with the same signature as non-overridable methods from Java classes (like Object.wait/notify) is now an error (when targeting JVM)
• KT-12302 abstract modifier for a member of interface is no longer a warning
• KT-12452 open modifier for a member of interface without implementation is now a warning
• KT-11111 Overriding by inline function is now a warning, overriding by a function with reified type parameter is an error
• KT-12337 Reference to a property with invisible setter now has KProperty type (as opposed to KMutableProperty)

Issues fixed

• KT-4285 No warning for a non-tail call when the method inherits default arguments from superclass
• KT-4764 Spurious "Variable must be initialized" in try/catch/finally
• KT-6665 Unresolved reference leads to marking subsequent code unreachable
• KT-9597 NullPointerException during resolution of complicated star projections
• KT-11750 Exceptions when creating various entries with the name "name" in enums
• KT-11998 Smart cast to not-null is not performed on a boolean property in if condition
• KT-10648 Exhaustiveness check does not work when sealed class hierarchy contains intermediate sealed classes
• KT-10717 Type inference for lambda with local return
• KT-11266 Fixed "Empty intersection of types" internal compiler error for some cases
• KT-11857 Fix visibility check for dynamic members within protected method (when targeting JS)
• KT-12589 Improved "infix modifier is inapplicable" diagnostic message
• KT-11679 Erroneous call with argument causes Throwable at ResolvedCallImpl.getArgumentMapping()
• KT-12623 Fix ISE on malformed code

JVM code generation

• KT-5075 Optimize array/collection indices usage in for loop
• KT-11116 Optimize coercion to Unit, POP operations are backward-propagated

Issues fixed

• KT-11499 Compiler crashes with "Incompatible stack heights"
• KT-11943 CompilationException with extension property of KClass
• KT-12125 Wrong increment/decrement on Byte/Char/Short.MAX_VALUE/MIN_VALUE
• KT-12192 Exhaustiveness check isn't generated for when expression returning Unit
• KT-12200 Erroneously optimized away assignment to a property initialized to zero
• KT-12582 "VerifyError: Bad local variable type" caused by explicit loop variable type
• KT-12708 Bridge method not generated when data class implements interface with copy() method
• KT-12106 import static of reified companion object method throws IllegalAccessError

Performance

• Reduced number of IO operation when loading kotlin compiled classes

Сompiler options

• Allow to specify version of Kotlin language for source compatibility with older releases.
  • CLI: -language-version command line option
  • Maven: languageVersion configuration parameter, linked with kotlin.compiler.languageVersion property
  • Gradle: kotlinOptions.languageVersion property in task configuration
• Allow to specify which java runtime target version to generate bytecode for.
  • CLI: -jvm-target command line option
  • Maven: jvmTarget configuration parameter, linked with kotlin.compiler.jvmTarget property
  • Gradle: kotlinOptions.jvmTarget property in task configuration
• Allow to specify path to JDK to resolve classes from.
  • CLI: -jdk-home command line option
  • Maven: jdkHome configuration parameter, linked with kotlin.compiler.jdkHome property
  • Gradle: kotlinOptions.jdkHome property in task configuration

Standard Library

• Improve documentation (including KT-11632)
• List iteration used in collection operations is performed with an indexed loop when the list supports RandomAccess and the operation isn't inlined

IDE

Completion

New features

• Smart completion after by and in
• Improved completion in bodies of overridden members (when no type is specified)
• Improved presentation of completion items for property accessors
• Fixed keyword completion after try in assignment expression
• KT-8527 Include non-imported declarations on the first completion
• KT-12068 Special completion item for "[]" get-operator access
• KT-12080 Parameter names are now higher up in completion list

Issues fixed

• Fixed enum members being present in completion as static members
• Fixed QuickDoc not working for properties generated for java classes
• KT-9166 Code completion does not work for synthetic java properties on typing "g"
• KT-11609 No named arguments completion should be after dot
• KT-11633 Wrong indentation after completing a statement in data class
• KT-11680 Code completion of label for existing return with value inserts redundant whitespace
• KT-11784 Completion for if statement should add parentheses automatically
• KT-11890 Completion for callable references does not propose static Java members
• KT-11912 String interpolation is not converted to ${} form when accessing this.property
• KT-11957 No catch and finally keywords in completion
• KT-12103 Smart completion for nested SAM-adapter produces short unresolved name
• KT-12138 Do not show "::error" in smart completion when any function type accepting one argument is expected
• KT-12150 Smart completion suggests to compare non-nullable with null
• KT-12124 No code completion for a java property in a specific position
• KT-12299 Completion: incorrect priority of property foo over method getFoo in Kotlin-only code
• KT-12328 Qualified function name inserted when typing before if
• KT-12427 Completion doesn't work for "@receiver:" annotation target
• KT-12447 Don't use CompletionProgressIndicator in Kotlin plugin
• KT-12669 Completion should show variant with () when there is default lambda
• KT-12369 Pressing dot after class name should not cause insertion of constructor call

Spring support

New features

• KT-11692 Support Spring model diagrams for Kotlin classes
• KT-12079 Support "Autowired members defined in invalid Spring bean" inspection on Kotlin declarations
• KT-12092 Implement bean references in @qualifier annotations
• KT-12135 Automatically configure components based on basePackageClasses attribute of @componentscan
• KT-12136 Implement package references inside of string literals
• KT-12139 Support Spring configurations linked via @import annotation
• KT-12278 Implement Spring @Autowired inspection
• KT-12465 Implement Spring @componentscan inspection

Issues fixed

• KT-12091 Fixed unstable behavior of Spring line markers
• KT-12096 Fixed rename of custom-named beans specified with Kotlin annotation
• KT-12117...