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.
2018-07-24 15:58:10 +03:00
parent 6fb913a463
commit df6d4f358a
28 changed files with 127 additions and 42 deletions
@@ -0,0 +1,39 @@
+@Target(AnnotationTarget.EXPRESSION)
+@Retention(AnnotationRetention.SOURCE)
+annotation class Ann
+
+fun testLambdaLabel() = l@ { 42 }
+
+fun testAnonymousFunctionLabel() = l@ fun() {}
+
+fun testAnnotatedLambdaLabel() = lambda@ @Ann {}
+
+fun testParenthesizedLambdaLabel() = lambda@ ( {} )
+
+fun testLabelBoundToInvokeOperatorExpression() = <!REDUNDANT_LABEL_WARNING!>l@<!> { 42 }()
+
+fun testLabelBoundToLambda() = (l@ { 42 })()
+
+fun testWhileLoopLabel() {
+    L@ while (true) {}
+}
+
+fun testDoWhileLoopLabel() {
+    L@ do {} while (true)
+}
+
+fun testForLoopLabel(xs: List<Any>) {
+    L@ for (x in xs) {}
+}
+
+fun testValLabel() {
+    <!REDUNDANT_LABEL_WARNING!>L@<!> val fn = {}
+    fn()
+}
+
+fun testHighOrderFunctionCallLabel() {
+    <!REDUNDANT_LABEL_WARNING!>L@<!> run {}
+}
+
+fun testAnonymousObjectLabel() =
+    <!REDUNDANT_LABEL_WARNING!>L@<!> object {}