[Issue 21176] deprecation inside template should show the instance loc as errorSupplemental

[d-bugmail at puremagic.com]

https://issues.dlang.org/show_bug.cgi?id=21176

Boris Carvajal <boris2.9 at gmail.com> changed:

           What    |Removed                     |Added
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                 CC|                            |boris2.9 at gmail.com

--- Comment #3 from Boris Carvajal <boris2.9 at gmail.com> ---
The required info is printed if you use "dmd -de" [1], but the more natural way
to implement this is to add an option to the "-dw" switch like -dw=context.

[1]:
onlineapp.d(6): Deprecation: variable onlineapp.a is deprecated
onlineapp.d(11): Error: template instance onlineapp.foo!int error instantiating

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