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https://issues.apache.org/jira/browse/FLEX-35329?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16059756#comment-16059756
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Josh Tynjala commented on FLEX-35329:
-------------------------------------
bb7447f5ebe32ce58f85a9e9b2d2ffc48994cf42
> Initializing member variable/constant that is [Deprecated] incorrectly throws
> extra warning
> -------------------------------------------------------------------------------------------
>
> Key: FLEX-35329
> URL: https://issues.apache.org/jira/browse/FLEX-35329
> Project: Apache Flex
> Issue Type: Bug
> Components: .Unspecified - Compiler
> Affects Versions: Apache Flex 4.16.0
> Reporter: Josh Tynjala
> Assignee: Josh Tynjala
> Priority: Minor
>
> Consider the following class:
> {code:title=Deprecated.as}
> package
> {
> import flash.display.Sprite;
> public class Deprecated extends Sprite
> {
> [Deprecated]
> public static var STATIC_DEPRECATED:String = "static";
> [Deprecated]
> public static var STATIC_DEPRECATED2:String;
> [Deprecated]
> public var memberDeprecated:String = "member";
> [Deprecated]
> public var memberDeprecated2:String;
> public function Deprecated()
> {
> STATIC_DEPRECATED = "new value";
> Deprecated.STATIC_DEPRECATED = "new value";
> memberDeprecated = "new value";
> this.memberDeprecated = "new value";
> STATIC_DEPRECATED2 = "new value";
> Deprecated.STATIC_DEPRECATED2 = "new value";
> memberDeprecated2 = "new value";
> this.memberDeprecated2 = "new value";
> }
> }
> }
> {code}
> The compiler should give eight warnings for each of the lines in the
> constructor. However, it actually gives 10 warnings. Here are the two extra
> warnings:
> {code}
> /Users/joshtynjala/Desktop/Deprecated/src/Deprecated.as(8): col: 21 Warning:
> 'STATIC_DEPRECATED' has been deprecated.
> public static var STATIC_DEPRECATED:String = "static";
> ^
> /Users/joshtynjala/Desktop/Deprecated/src/Deprecated.as(14): col: 14 Warning:
> 'memberDeprecated' has been deprecated.
> public var memberDeprecated:String = "member";
> ^
> {code}
> Notice that there are no warnings for STATIC_DEPRECATED2 and
> memberDeprecated2 because they are not initialized. It's only when a member
> or static variable is initialized that the warnings are shown. It appears
> that when the compiler checks for usage of deprecated variables is a little
> too aggressive.
> The Falcon compiler and Adobe's ASC 2.0 compiler do not give these same extra
> warnings. They only give a warning on actual usage.
> These warnings make it difficult to deprecate a constant or another variable
> in an open source library. It makes compile-time noisy with a lot of warnings
> that need to be ignored.
> Note: When compiling with a library in SWC form, the compiler does not show
> these warnings. I suspect that this is why this was never really encountered
> with the Flex framework, since the SWCs are pre-compiled. However, for many
> open source libraries, developers often simply use the source code with the
> -source-path compiler option instead of a pre-compiled SWC. That's when these
> warnings can be seen. As a long-time library developer, I never used
> [Deprecated] metadata because of this bug.
> Solution, which I will implement:
> In LintEvaluator, modify evaluate( Context cx, SetExpressionNode node ).
> {code}
> if (slot != null && !(node.expr instanceof QualifiedIdentifierNode))
> {
> //if it's a qualified identifier node, then it's a member/static
> //variable on a class that is being initialized, like this:
> //public var memberVar:String = "hi";
> //this case should not have a warning!
> checkDeprecatedSlot(cx, node.expr, node.ref, slot);
> }
> {code}
> The declaration of a member/static variable is a QualifiedIdentifierNode
> (qualified meaning that it has modifiers like public/private, static, etc.),
> but actual usage will be an IdentifierNode instead. So, if it's a
> QualifiedIdentifierNode, we know that we don't need to check if the variable
> is deprecated or not.
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