Make deprecation warnings compile errors #7389
Merged
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This is already the way we build Phobos + Tools.
See also: dlang/phobos#5546
The idea is that whenever sth. gets deprecated in Druntime or Phobos a replacement needs to exists. By always building with
-de, we can enforce that the replacement really exists and force the person who submits the deprecation to look after the fallout.CC @ZombineDev @CyberShadow