L-value of assignment expression can now be annotated with expression-targeted annotation #KT-9154 Fixed

compiler/testData/diagnostics/tests/annotations/options/assignment.kt

@@ -0,0 +1,9 @@
+@Target(AnnotationTarget.EXPRESSION)
+annotation class ExprAnn
+
+fun foo(): Int {
+    var a: Int
+    @ExprAnn a = 1
+    @ExprAnn a += 1
+    return a
+}