October 24
https://issues.dlang.org/show_bug.cgi?id=17933

          Issue ID: 17933
           Summary: Warn in case of implicit truncating float conversion
           Product: D
           Version: D2
          Hardware: All
                OS: All
            Status: NEW
          Severity: enhancement
          Priority: P1
         Component: dmd
          Assignee: nobody@puremagic.com
          Reporter: b2.temp@gmx.com

Implicit float conversions (e.g from real to float) may lead to a precision
loss.

--