https://issues.dlang.org/show_bug.cgi?id=13582

          Issue ID: 13582
           Summary: Deprecated modules imported from other deprecated
                    modules shouldn't be warned about
           Product: D
           Version: D1 & D2
          Hardware: x86_64
                OS: Linux
            Status: NEW
          Severity: minor
          Priority: P1
         Component: DMD
          Assignee: nobody@puremagic.com
          Reporter: public@dicebot.lv

Recently added "deprecated module" feature pints deprecation message every time import statement is encountered. This results in excessive warning spam and makes test coverage of deprecated modules problebatic.

Simple solution to make output more useful is to only print deprecation message for the first deprecated import in the import chain. This is especially helpful when module groups or packages get deprecated at once.

--