[Issue 22559] New: ImportC: support gnu case ranges

[d-bugmail at puremagic.com]

https://issues.dlang.org/show_bug.cgi?id=22559

          Issue ID: 22559
           Summary: ImportC: support gnu case ranges
           Product: D
           Version: D2
          Hardware: All
                OS: All
            Status: NEW
          Severity: enhancement
          Priority: P1
         Component: dmd
          Assignee: nobody at puremagic.com
          Reporter: dave287091 at gmail.com

Gcc and clang have a case range extension for C which would map exactly to D’s
case range statements. See https://gcc.gnu.org/onlinedocs/gcc/Case-Ranges.html

I haven’t encountered any headers using this feature, but my personal C
programs use it as it is a nice extension.

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