[Issue 13397] allow postfix function attributes like 'safe', 'system' and so on without '@'

[via Digitalmars-d-bugs]

https://issues.dlang.org/show_bug.cgi?id=13397

--- Comment #10 from Kenji Hara <k.hara...@gmail.com> ---
(In reply to Ketmar Dark from comment #2)
> Created attachment 1395 [details]
> postfix function attributes w/o '@' (better code, allows nogc {} and nogc:)

Combination of prefix attribute and contextual keyword feature will cause
ambiguity.

struct nogc {}
nogc foo() { return *(new nogc()); }   // func must not be @nogc

I think just only postfix cases should be accepted.

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