KT-22274 report warning on labels that can't be referenced
Labels are meaningful only if they can be referenced by 'break', 'continue', or 'return' expressions.
This commit is contained in:
@@ -298,6 +298,17 @@ class ControlFlowProcessor(
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generateInstructions(baseExpression)
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copyValue(baseExpression, expression)
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}
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val labelNameExpression = expression.getTargetLabel()
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if (labelNameExpression != null) {
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val deparenthesizedBaseExpression = KtPsiUtil.deparenthesize(expression)
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if (deparenthesizedBaseExpression !is KtLambdaExpression &&
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deparenthesizedBaseExpression !is KtLoopExpression &&
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deparenthesizedBaseExpression !is KtNamedFunction
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) {
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trace.report(Errors.REDUNDANT_LABEL_WARNING.on(labelNameExpression))
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}
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}
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}
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override fun visitBinaryExpression(expression: KtBinaryExpression) {
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@@ -822,6 +822,8 @@ public interface Errors {
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DiagnosticFactory0<KtExpressionWithLabel> NOT_A_FUNCTION_LABEL = DiagnosticFactory0.create(ERROR);
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DiagnosticFactory0<KtExpressionWithLabel> NOT_A_FUNCTION_LABEL_WARNING = DiagnosticFactory0.create(WARNING);
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DiagnosticFactory0<KtElement> REDUNDANT_LABEL_WARNING = DiagnosticFactory0.create(WARNING);
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// Control flow / Data flow
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DiagnosticFactory1<KtElement, List<TextRange>> UNREACHABLE_CODE = DiagnosticFactory1.create(
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+2
@@ -602,6 +602,8 @@ public class DefaultErrorMessages {
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MAP.put(NOT_A_FUNCTION_LABEL, "Target label does not denote a function");
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MAP.put(NOT_A_FUNCTION_LABEL_WARNING, "Target label does not denote a function");
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MAP.put(REDUNDANT_LABEL_WARNING, "Label is redundant, because it can not be referenced in either ''break'', ''continue'', or ''return'' expression");
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MAP.put(ANONYMOUS_INITIALIZER_IN_INTERFACE, "Anonymous initializers are not allowed in interfaces");
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MAP.put(NULLABLE_SUPERTYPE, "A supertype cannot be nullable");
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MAP.put(DYNAMIC_SUPERTYPE, "A supertype cannot be dynamic");
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+2
-2
@@ -2,7 +2,7 @@ class C {
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fun f (<!UNUSED_PARAMETER!>a<!> : Boolean, <!UNUSED_PARAMETER!>b<!> : Boolean) {
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b@ while (true)
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a@ {
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<!REDUNDANT_LABEL_WARNING!>a@<!> {
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<!NOT_A_LOOP_LABEL!>break@f<!>
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break
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<!UNREACHABLE_CODE!>break@b<!>
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@@ -12,7 +12,7 @@ class C {
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<!BREAK_OR_CONTINUE_OUTSIDE_A_LOOP!>continue<!>
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b@ while (true)
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a@ {
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<!REDUNDANT_LABEL_WARNING!>a@<!> {
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<!NOT_A_LOOP_LABEL!>continue@f<!>
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continue
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<!UNREACHABLE_CODE!>continue@b<!>
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+1
-1
@@ -17,7 +17,7 @@ fun test() : Unit {
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val <!UNUSED_VARIABLE!>s<!> = "" as Any
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("" as String?)?.length
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(data@("" as String?))?.length
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(<!REDUNDANT_LABEL_WARNING!>data@<!>("" as String?))?.length
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(<!WRONG_ANNOTATION_TARGET!>@MustBeDocumented()<!>( "" as String?))?.length
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Unit
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}
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@@ -59,7 +59,7 @@ fun main1() {
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{1}();
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(fun (x : Int) = x)(1)
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1.(fun Int.(x : Int) = x)(1);
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l@{1}()
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<!OI;REDUNDANT_LABEL_WARNING!>l@<!>{1}()
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1.((fun Int.() = 1))()
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1.(f())()
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1.if(true){f()}else{f()}()
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+5
-5
@@ -78,17 +78,17 @@ class Test() {
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(f@ <!VARIABLE_EXPECTED!>getInt()<!>) += 343
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<!VARIABLE_EXPECTED!>1<!>++
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(r@ <!VARIABLE_EXPECTED!>1<!>)++
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(<!REDUNDANT_LABEL_WARNING!>r@<!> <!VARIABLE_EXPECTED!>1<!>)++
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<!VARIABLE_EXPECTED!>getInt()<!>++
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(m@ <!VARIABLE_EXPECTED!>getInt()<!>)++
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(<!REDUNDANT_LABEL_WARNING!>m@<!> <!VARIABLE_EXPECTED!>getInt()<!>)++
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this<!UNRESOLVED_REFERENCE!>++<!>
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var s : String = "r"
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s += "ss"
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s += this
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s += (a@ 2)
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s += (<!REDUNDANT_LABEL_WARNING!>a@<!> 2)
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}
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fun testIncompleteSyntax() {
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@@ -106,7 +106,7 @@ class Test() {
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<!VAL_REASSIGNMENT!>b<!> += 34
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a++
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(l@ a)++
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(<!REDUNDANT_LABEL_WARNING!>l@<!> a)++
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<!UNUSED_CHANGED_VALUE!>(a)++<!>
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}
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@@ -126,7 +126,7 @@ class Test() {
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ab.getArray()[54] = 23
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ab.getArray()[54]++
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(f@ a)[3] = 4
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(<!REDUNDANT_LABEL_WARNING!>f@<!> a)[3] = 4
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this<!NO_SET_METHOD!><!UNRESOLVED_REFERENCE!>[<!>54<!UNRESOLVED_REFERENCE!>]<!><!> = 34
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}
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@@ -22,6 +22,6 @@ fun main(args : Array<String>) {
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<!NO_COMPANION_OBJECT!>System<!> is Int
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<!INVISIBLE_MEMBER!>System<!>()
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(<!NO_COMPANION_OBJECT!>System<!>)
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foo@ <!NO_COMPANION_OBJECT!>System<!>
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<!OI;REDUNDANT_LABEL_WARNING!>foo@<!> <!NO_COMPANION_OBJECT!>System<!>
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null in <!NO_COMPANION_OBJECT!>System<!>
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}
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+2
-2
@@ -5,8 +5,8 @@
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annotation class yield
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fun bar(p: Int) {
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<!YIELD_IS_RESERVED!>yield<!>@ p
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`yield`@ p
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<!REDUNDANT_LABEL_WARNING!><!YIELD_IS_RESERVED!>yield<!>@<!> p
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<!REDUNDANT_LABEL_WARNING!>`yield`@<!> p
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@<!YIELD_IS_RESERVED!>yield<!>() p
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@`yield`() p
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+1
-1
@@ -21,7 +21,7 @@ fun <!UNDERSCORE_IS_RESERVED!>__<!>(<!UNDERSCORE_IS_RESERVED!>___<!>: Int, y: <!
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fun localFun(<!UNDERSCORE_IS_RESERVED!>_<!>: String) = 1
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<!UNDERSCORE_IS_RESERVED!>__<!>@ return if (y != null) <!UNDERSCORE_USAGE_WITHOUT_BACKTICKS!>__<!>(<!UNDERSCORE_USAGE_WITHOUT_BACKTICKS!>____<!>, y) else <!UNDERSCORE_USAGE_WITHOUT_BACKTICKS!>__<!>(`_`, <!UNDERSCORE_USAGE_WITHOUT_BACKTICKS!>______<!>)
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<!REDUNDANT_LABEL_WARNING!><!UNDERSCORE_IS_RESERVED!>__<!>@<!> return if (y != null) <!UNDERSCORE_USAGE_WITHOUT_BACKTICKS!>__<!>(<!UNDERSCORE_USAGE_WITHOUT_BACKTICKS!>____<!>, y) else <!UNDERSCORE_USAGE_WITHOUT_BACKTICKS!>__<!>(`_`, <!UNDERSCORE_USAGE_WITHOUT_BACKTICKS!>______<!>)
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}
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+1
-1
@@ -12,7 +12,7 @@ fun test2() {
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<!UNREACHABLE_CODE!>bar(<!>11, todo()/*comment1*/, <!UNREACHABLE_CODE!>""/*comment2*/)<!>
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}
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fun test3() {
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<!UNREACHABLE_CODE!>bar(<!>11, l@(todo()/*comment*/), <!UNREACHABLE_CODE!>"")<!>
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<!UNREACHABLE_CODE!>bar(<!>11, <!REDUNDANT_LABEL_WARNING!>l@<!>(todo()/*comment*/), <!UNREACHABLE_CODE!>"")<!>
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}
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fun todo(): Nothing = throw Exception()
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+1
-1
@@ -19,7 +19,7 @@ class TestObjectLiteral {
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val y = <!UNINITIALIZED_VARIABLE!>obj<!>
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}
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}
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val obj1: A = l@ ( object: A(<!UNINITIALIZED_VARIABLE!>obj1<!>) {
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val obj1: A = <!REDUNDANT_LABEL_WARNING!>l@<!> ( object: A(<!UNINITIALIZED_VARIABLE!>obj1<!>) {
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init {
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val x = <!UNINITIALIZED_VARIABLE!>obj1<!>
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}
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+2
-2
@@ -51,12 +51,12 @@ fun testLoopLabelInReturn(xs: List<Int>) {
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}
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fun testValLabelInReturn() {
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L@ val fn = { <!NOT_A_FUNCTION_LABEL!>return@L<!> }
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<!REDUNDANT_LABEL_WARNING!>L@<!> val fn = { <!NOT_A_FUNCTION_LABEL!>return@L<!> }
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fn()
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}
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fun testHighOrderFunctionCallLabelInReturn() {
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L@ run {
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<!REDUNDANT_LABEL_WARNING!>L@<!> run {
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<!NOT_A_FUNCTION_LABEL!>return@L<!>
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}
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}
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+2
-2
@@ -51,12 +51,12 @@ fun testLoopLabelInReturn(xs: List<Int>) {
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}
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fun testValLabelInReturn() {
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L@ val fn = { <!NOT_A_FUNCTION_LABEL_WARNING!>return@L<!> }
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<!REDUNDANT_LABEL_WARNING!>L@<!> val fn = { <!NOT_A_FUNCTION_LABEL_WARNING!>return@L<!> }
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fn()
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}
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fun testHighOrderFunctionCallLabelInReturn() {
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L@ run {
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<!REDUNDANT_LABEL_WARNING!>L@<!> run {
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<!NOT_A_FUNCTION_LABEL_WARNING!>return@L<!>
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}
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}
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@@ -0,0 +1,39 @@
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@Target(AnnotationTarget.EXPRESSION)
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@Retention(AnnotationRetention.SOURCE)
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annotation class Ann
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fun testLambdaLabel() = l@ { 42 }
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fun testAnonymousFunctionLabel() = l@ fun() {}
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fun testAnnotatedLambdaLabel() = lambda@ @Ann {}
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fun testParenthesizedLambdaLabel() = lambda@ ( {} )
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fun testLabelBoundToInvokeOperatorExpression() = <!REDUNDANT_LABEL_WARNING!>l@<!> { 42 }()
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fun testLabelBoundToLambda() = (l@ { 42 })()
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fun testWhileLoopLabel() {
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L@ while (true) {}
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}
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fun testDoWhileLoopLabel() {
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L@ do {} while (true)
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}
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fun testForLoopLabel(xs: List<Any>) {
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L@ for (x in xs) {}
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}
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fun testValLabel() {
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<!REDUNDANT_LABEL_WARNING!>L@<!> val fn = {}
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fn()
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}
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fun testHighOrderFunctionCallLabel() {
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<!REDUNDANT_LABEL_WARNING!>L@<!> run {}
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}
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fun testAnonymousObjectLabel() =
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<!REDUNDANT_LABEL_WARNING!>L@<!> object {}
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@@ -0,0 +1,21 @@
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package
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public fun testAnnotatedLambdaLabel(): () -> kotlin.Unit
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public fun testAnonymousFunctionLabel(): () -> kotlin.Unit
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public fun testAnonymousObjectLabel(): kotlin.Any
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public fun testDoWhileLoopLabel(): kotlin.Unit
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public fun testForLoopLabel(/*0*/ xs: kotlin.collections.List<kotlin.Any>): kotlin.Unit
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public fun testHighOrderFunctionCallLabel(): kotlin.Unit
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public fun testLabelBoundToInvokeOperatorExpression(): kotlin.Int
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public fun testLabelBoundToLambda(): kotlin.Int
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public fun testLambdaLabel(): () -> kotlin.Int
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public fun testParenthesizedLambdaLabel(): () -> kotlin.Unit
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public fun testValLabel(): kotlin.Unit
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public fun testWhileLoopLabel(): kotlin.Unit
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@kotlin.annotation.Target(allowedTargets = {AnnotationTarget.EXPRESSION}) @kotlin.annotation.Retention(value = AnnotationRetention.SOURCE) public final annotation class Ann : kotlin.Annotation {
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public constructor Ann()
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public open override /*1*/ /*fake_override*/ fun equals(/*0*/ other: kotlin.Any?): kotlin.Boolean
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public open override /*1*/ /*fake_override*/ fun hashCode(): kotlin.Int
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public open override /*1*/ /*fake_override*/ fun toString(): kotlin.String
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}
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Vendored
+1
-1
@@ -1,7 +1,7 @@
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import kotlin.reflect.KProperty
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class A3 {
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val a: String by l@ MyProperty()
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val a: String by <!REDUNDANT_LABEL_WARNING!>l@<!> MyProperty()
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class MyProperty<T> {}
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+1
-1
@@ -1,3 +1,3 @@
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fun test() {
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(d@ <!DECLARATION_IN_ILLEGAL_CONTEXT!>val <!UNUSED_VARIABLE!>bar<!> = 2<!>)
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(<!REDUNDANT_LABEL_WARNING!>d@<!> <!DECLARATION_IN_ILLEGAL_CONTEXT!>val <!UNUSED_VARIABLE!>bar<!> = 2<!>)
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}
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+5
-5
@@ -5,19 +5,19 @@ package m
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fun test(i: Int?) {
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if (i != null) {
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foo(l1@ <!DEBUG_INFO_SMARTCAST!>i<!>)
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foo(<!OI;REDUNDANT_LABEL_WARNING!>l1@<!> <!DEBUG_INFO_SMARTCAST!>i<!>)
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foo((<!DEBUG_INFO_SMARTCAST!>i<!>))
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foo(l2@ (<!DEBUG_INFO_SMARTCAST!>i<!>))
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foo((l3@ <!DEBUG_INFO_SMARTCAST!>i<!>))
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foo(<!OI;REDUNDANT_LABEL_WARNING!>l2@<!> (<!DEBUG_INFO_SMARTCAST!>i<!>))
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foo((<!OI;REDUNDANT_LABEL_WARNING!>l3@<!> <!DEBUG_INFO_SMARTCAST!>i<!>))
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}
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val a: Int = l4@ <!TYPE_MISMATCH!>""<!>
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val a: Int = <!OI;REDUNDANT_LABEL_WARNING!>l4@<!> <!TYPE_MISMATCH!>""<!>
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val b: Int = (<!TYPE_MISMATCH!>""<!>)
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val c: Int = checkSubtype<Int>(<!TYPE_MISMATCH!>""<!>)
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val d: Int = <!NI;TYPE_MISMATCH, NI;TYPE_MISMATCH, TYPE_MISMATCH!>checkSubtype<Long>(<!TYPE_MISMATCH!>""<!>)<!>
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foo(l4@ <!TYPE_MISMATCH!>""<!>)
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foo(<!OI;REDUNDANT_LABEL_WARNING!>l4@<!> <!TYPE_MISMATCH!>""<!>)
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foo((<!TYPE_MISMATCH!>""<!>))
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foo(checkSubtype<Int>(<!NI;TYPE_MISMATCH, NI;TYPE_MISMATCH, TYPE_MISMATCH!>""<!>))
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foo(<!NI;TYPE_MISMATCH, TYPE_MISMATCH!>checkSubtype<Long>(<!NI;TYPE_MISMATCH, NI;TYPE_MISMATCH, TYPE_MISMATCH!>""<!>)<!>)
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@@ -1,3 +1,3 @@
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fun f(s : String?) : Boolean {
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return foo@(s?.equals("a"))!!
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return <!REDUNDANT_LABEL_WARNING!>foo@<!>(s?.equals("a"))!!
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}
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+1
-1
@@ -11,7 +11,7 @@ fun <V> id(value: V) = value
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val par1 = (foo()) as String
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val par2 = ((foo())) as String
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val par3 = (dd@ (foo())) as String
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val par3 = (<!REDUNDANT_LABEL_WARNING!>dd@<!> (foo())) as String
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val par4 = ( @bar() (foo())) as String
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+4
-4
@@ -24,17 +24,17 @@ inline fun foo(bar1: (String.() -> Int) -> Int, bar2: (()->Int) -> Int) {
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}
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inline fun foo2(bar1: (String.() -> Int) -> Int) {
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l1@ <!USAGE_IS_NOT_INLINABLE!>bar1<!>
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<!REDUNDANT_LABEL_WARNING!>l1@<!> <!USAGE_IS_NOT_INLINABLE!>bar1<!>
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l2@ bar1 {
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<!REDUNDANT_LABEL_WARNING!>l2@<!> bar1 {
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11
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}
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(l3@ bar1) {
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(<!REDUNDANT_LABEL_WARNING!>l3@<!> bar1) {
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11
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}
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(l5@ (l4@ bar1)) {
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(<!REDUNDANT_LABEL_WARNING!>l5@<!> (<!REDUNDANT_LABEL_WARNING!>l4@<!> bar1)) {
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11
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}
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}
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@@ -22,6 +22,6 @@ inline fun inlineFunWithInvoke2(s: (p: Int) -> Unit) {
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}
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inline fun propagation(s: (p: Int) -> Unit) {
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inlineFunWithInvoke((label@ s))
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inlineFunWithInvoke((label2@ label@ s))
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inlineFunWithInvoke((<!REDUNDANT_LABEL_WARNING!>label@<!> s))
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inlineFunWithInvoke((<!REDUNDANT_LABEL_WARNING!>label2@<!> <!REDUNDANT_LABEL_WARNING!>label@<!> s))
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}
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+2
-2
@@ -9,8 +9,8 @@ fun main(args : Array<String>) {
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val <!UNUSED_VARIABLE!>h<!> : String = <!TYPE_MISMATCH!>v--<!>;
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val <!UNUSED_VARIABLE!>h1<!> : String = <!TYPE_MISMATCH!>--v<!>;
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val <!UNUSED_VARIABLE!>i<!> : String = <!TYPE_MISMATCH!>!true<!>;
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val <!UNUSED_VARIABLE!>j<!> : String = foo@ <!CONSTANT_EXPECTED_TYPE_MISMATCH!>true<!>;
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val <!UNUSED_VARIABLE!>k<!> : String = foo@ bar@ <!CONSTANT_EXPECTED_TYPE_MISMATCH!>true<!>;
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val <!UNUSED_VARIABLE!>j<!> : String = <!OI;REDUNDANT_LABEL_WARNING!>foo@<!> <!CONSTANT_EXPECTED_TYPE_MISMATCH!>true<!>;
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val <!UNUSED_VARIABLE!>k<!> : String = <!OI;REDUNDANT_LABEL_WARNING!>foo@<!> <!OI;REDUNDANT_LABEL_WARNING!>bar@<!> <!CONSTANT_EXPECTED_TYPE_MISMATCH!>true<!>;
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val <!UNUSED_VARIABLE!>l<!> : String = <!TYPE_MISMATCH!>-1<!>;
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val <!UNUSED_VARIABLE!>m<!> : String = <!TYPE_MISMATCH!>+1<!>;
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}
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+2
-2
@@ -14,7 +14,7 @@ fun test(bar: Bar, a: A) {
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// no elements with error types
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fooInt((bar()))
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fooInt(if (true) bar() else bar())
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fooInt(label@ bar())
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fooInt(<!REDUNDANT_LABEL_WARNING!>label@<!> bar())
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fooInt(a.bar())
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fooInt(((label@ if (true) (a.bar()) else bar())))
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fooInt(((<!REDUNDANT_LABEL_WARNING!>label@<!> if (true) (a.bar()) else bar())))
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}
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@@ -1,23 +1,23 @@
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fun testEquals(x: Int) {
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if (<!SENSELESS_COMPARISON!>x == null<!>) {}
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if (<!SENSELESS_COMPARISON!>x == (null)<!>) {}
|
||||
if (<!SENSELESS_COMPARISON!>x == foo@ null<!>) {}
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if (<!SENSELESS_COMPARISON!>x == <!REDUNDANT_LABEL_WARNING!>foo@<!> null<!>) {}
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||||
}
|
||||
|
||||
fun testEqualsFlipped(x: Int) {
|
||||
if (<!SENSELESS_COMPARISON!>null == x<!>) {}
|
||||
if (<!SENSELESS_COMPARISON!>(null) == x<!>) {}
|
||||
if (<!SENSELESS_COMPARISON!>foo@ null == x<!>) {}
|
||||
if (<!SENSELESS_COMPARISON!><!REDUNDANT_LABEL_WARNING!>foo@<!> null == x<!>) {}
|
||||
}
|
||||
|
||||
fun testNotEquals(x: Int) {
|
||||
if (<!SENSELESS_COMPARISON!>x != null<!>) {}
|
||||
if (<!SENSELESS_COMPARISON!>x != (null)<!>) {}
|
||||
if (<!SENSELESS_COMPARISON!>x != foo@ null<!>) {}
|
||||
if (<!SENSELESS_COMPARISON!>x != <!REDUNDANT_LABEL_WARNING!>foo@<!> null<!>) {}
|
||||
}
|
||||
|
||||
fun testNotEqualsFlipped(x: Int) {
|
||||
if (<!SENSELESS_COMPARISON!>null != x<!>) {}
|
||||
if (<!SENSELESS_COMPARISON!>(null) != x<!>) {}
|
||||
if (<!SENSELESS_COMPARISON!>foo@ null != x<!>) {}
|
||||
if (<!SENSELESS_COMPARISON!><!REDUNDANT_LABEL_WARNING!>foo@<!> null != x<!>) {}
|
||||
}
|
||||
@@ -4140,6 +4140,11 @@ public class DiagnosticsTestGenerated extends AbstractDiagnosticsTest {
|
||||
runTest("compiler/testData/diagnostics/tests/controlStructures/notAFunctionLabel_before.kt");
|
||||
}
|
||||
|
||||
@TestMetadata("redundantLabel.kt")
|
||||
public void testRedundantLabel() throws Exception {
|
||||
runTest("compiler/testData/diagnostics/tests/controlStructures/redundantLabel.kt");
|
||||
}
|
||||
|
||||
@TestMetadata("specialConstructsAndPlatformTypes.kt")
|
||||
public void testSpecialConstructsAndPlatformTypes() throws Exception {
|
||||
runTest("compiler/testData/diagnostics/tests/controlStructures/specialConstructsAndPlatformTypes.kt");
|
||||
|
||||
Generated
+5
@@ -4140,6 +4140,11 @@ public class DiagnosticsUsingJavacTestGenerated extends AbstractDiagnosticsUsing
|
||||
runTest("compiler/testData/diagnostics/tests/controlStructures/notAFunctionLabel_before.kt");
|
||||
}
|
||||
|
||||
@TestMetadata("redundantLabel.kt")
|
||||
public void testRedundantLabel() throws Exception {
|
||||
runTest("compiler/testData/diagnostics/tests/controlStructures/redundantLabel.kt");
|
||||
}
|
||||
|
||||
@TestMetadata("specialConstructsAndPlatformTypes.kt")
|
||||
public void testSpecialConstructsAndPlatformTypes() throws Exception {
|
||||
runTest("compiler/testData/diagnostics/tests/controlStructures/specialConstructsAndPlatformTypes.kt");
|
||||
|
||||
Reference in New Issue
Block a user