[Issue 7157] Optimiser is O(n^2) w.r.t. function length

[via Digitalmars-d-bugs]

https://issues.dlang.org/show_bug.cgi?id=7157

--- Comment #7 from Martin Nowak <code at dawg.eu> ---
(In reply to Jonathan M Davis from comment #6)
> Which trick are you referring to?

https://github.com/D-Programming-Language/phobos/pull/2767

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