https://issues.dlang.org/show_bug.cgi?id=13762

          Issue ID: 13762
           Summary: -9223372036854775808L cause integer overflow error
           Product: D
           Version: D2
          Hardware: x86_64
                OS: Linux
            Status: NEW
          Severity: enhancement
          Priority: P1
         Component: DMD
          Assignee: nobody@puremagic.com
          Reporter: deadalnix@gmail.com

This is long.min, so it should certainly not overflow long, and is defined as long because of the trailing L.

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