Try to compile this with DMD:
alias ref int x;
alias y = ref int;
The parser accepts the first declaration, but not the second. The language specification has no grammar rules that can be used to produce the first declaration.
Related:
https://github.com/Hackerpilot/Dscanner/issues/125
Comment #1 by andrej.mitrovich — 2014-04-22T21:17:36Z
*** This issue has been marked as a duplicate of issue 11632 ***