https://issues.dlang.org/show_bug.cgi?id=20796

          Issue ID: 20796
           Summary: protection attribute package(x.y) does not bind to one
                    of ancestor packages of module x.y when declared in
                    x/y/package.d
           Product: D
           Version: D2
          Hardware: All
                OS: All
            Status: NEW
          Severity: enhancement
          Priority: P1
         Component: dmd
          Assignee: nobody@puremagic.com
          Reporter: iamthewilsonator@hotmail.com

file x/y/package.d:

module x.y;
package(x.y) void foo();

results in

x/y/package.d(2): Error: protection attribute package(x.y) does not bind to one
of ancestor packages of module x.y

which is patently false.

In particular this makes it very annoying to convert a large module, say x.y, into a package and convert all private protection symbols to package(x.y) symbols when moving symbols from x.y to x.y.a.

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