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
+}

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

@@ -0,0 +1,10 @@
+package
+
+public fun foo(): kotlin.Int
+
+@kotlin.annotation.Target(allowedTargets = {AnnotationTarget.EXPRESSION}) @kotlin.annotation.annotation() public final class ExprAnn : kotlin.Annotation {
+    public constructor ExprAnn()
+    public open override /*1*/ /*fake_override*/ fun equals(/*0*/ other: kotlin.Any?): kotlin.Boolean
+    public open override /*1*/ /*fake_override*/ fun hashCode(): kotlin.Int
+    public open override /*1*/ /*fake_override*/ fun toString(): kotlin.String
+}