dmd.dip25-default.dd

`-preview=dip25` has been enabled by default

Deprecation warnings for [DIP25](http://dlang.org/dips/25) violations have been enabled since 2.092.
Starting with this release, it will report errors, unless the `-revert=dip25` switch is used.
Using the switch (or its short version `-dip25`) is now deprecated.

---
ref int escapeRef(ref int x) {return x;}

// Formerly:
// Deprecation: returning `x` escapes a reference to parameter `x`
//        perhaps annotate the parameter with `return`
//
// Now it is an error, unless `-revert=dip25` is used
---