[Issue 24136] Support shortened methods syntax

[d-bugmail at puremagic.com]

https://issues.dlang.org/show_bug.cgi?id=24136

--- Comment #1 from Elias Batek (0xEAB) <desisma at heidel.beer> ---
Error message:

errors in imported modules: Error:
C:\D\dmd2\src\phobos\std\range\package.d(1028): => shortened method not
enabled, compile with compiler switch -preview=shortenedMethods

ArokhSlade reports that…

> adding the switch doesn't change a thing

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