[Issue 9960] Show warnings/deprecations during template instantiation

[d-bugmail at puremagic.com]

http://d.puremagic.com/issues/show_bug.cgi?id=9960



--- Comment #3 from Don <clugdbug at yahoo.com.au> 2013-04-22 01:29:25 PDT ---
> In fact, a different template might get picked with "-de" compared to the
default "-dw" so we shouldn't ever gag deprecation errors during template
instantiation, no matter whether "-v" was specified or not.

This is incorrect, it would remove the possibility of compiling without
deprecated features, which is the most important and common case!

This would break existing code, and worse, would give no way to fix it.


It's actually a difficult problem. What's needed instead, I think, is a flag
for "tell me which recently deprecated features I'm still using."

Suppose feature F7 is deprecated in release 7, and feature F9 is deprecated in
release 9. Initially your code contains F7 and F9.
When release 7 is released, you fix your code so that it no longer uses F7.
Once you've done this, you never want to hear a warning about F7 again, you
want to act as if it had never existed in the language.

Then, release 9 happens. Now, you want to know when you are using feature F9.
You actually don't care about F7 any more.

The point is -- you only care about the use of deprecated features *while you
are in the process of removing them*. The compiler should be silent except in
that case. The only possibility I can see is a compiler to flag to tell the
compiler that this is what you're doing.

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