[Issue 12421] Allow simpler syntax for lambda template declarations

[via Digitalmars-d-bugs]

https://issues.dlang.org/show_bug.cgi?id=12421

--- Comment #3 from Kenji Hara <k.hara.pg at gmail.com> ---
Spec change:
https://github.com/D-Programming-Language/dlang.org/pull/589

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