[Issue 199] Label causes scope to collapse into parent

[d-bugmail at puremagic.com]

http://d.puremagic.com/issues/show_bug.cgi?id=199



--- Comment #32 from Nick Treleaven <ntrel-public at yahoo.co.uk> 2013-06-06 05:20:21 PDT ---
(In reply to comment #31)
> >> The (imo correct) path is that the NoScopeStatment should still 
> >> provide no scope, but emit a deprecated message if anything 
> >> declared in the scope is used.
> 
> If you're going to go as far as that, why not emit a deprecation message if any
> declarations appear in it at all?

That sounds easier to implement, and IMO is a bit better than deprecating
having a non-empty block after a label. We would also need to deprecate having
scope() statements in a labelled block. Bug 827 would also need a solution.

comment #30:
> I understand your position, but deprecation really implies that something WILL
> be removed, and usage NEEDS to stop. Having something permanently deprecated is
> not tenable: there is a compile mode that makes deprecated calls errors, and
> here, it is not an error.

If a user has chosen to enable deprecation errors, that is their problem IMO.
By default the code would not break.

Note: GTK2 kept its deprecated symbols until GTK3, rather than scheduling
removal at a certain date.

Anyway, a limited period of deprecation rather than just changing behaviour
might be a good compromise. Perhaps 2 years?

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