[Issue 13989] add system-specific ext to -of parameter if ext is invalid

[via Digitalmars-d-bugs]

https://issues.dlang.org/show_bug.cgi?id=13989

Orvid King <blah38621 at gmail.com> changed:

           What    |Removed                     |Added
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                 CC|                            |blah38621 at gmail.com

--- Comment #1 from Orvid King <blah38621 at gmail.com> ---
I disagree with this, it is perfectly reasonable to want to output a file with
a non-standard extension, many plugin mechanisms for instance use a file
extension other than .dll. I believe it is the user's issue if they want to
output a file with an extension of .cool.

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