[Issue 13388] accept '@' before 'nothrow' and 'pure'

[via Digitalmars-d-bugs]

https://issues.dlang.org/show_bug.cgi?id=13388

--- Comment #32 from Sobirari Muhomori <dfj1esp02 at sneakemail.com> ---
Automated migration from keyword syntax to attribute syntax can be done by
dfix. Then attribute syntax can be enforced if needed.

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