Fixes Issue 8509 - Appending base type to enum should not result in new enum type.
Merge pull request #1829 from 9rnsr/fix9773

Issue 9773 - ref parameter with default string literal should not compile
Merge branch 'master' of github.com:D-Programming-Language/dmd
Merge branch 'master' of github.com:D-Programming-Language/dmd
Merge branch 'master' of github.com:D-Programming-Language/dmd
Merge branch 'master' of github.com:D-Programming-Language/dmd
Merge branch 'master' of github.com:D-Programming-Language/dmd
Merge branch 'master' of github.com:D-Programming-Language/dmd
fix Issue 8081 - pure nothrow unittest problem in generated 'header' file
Merge branch 'master' of github.com:D-Programming-Language/dmd
Merge branch 'master' of github.com:D-Programming-Language/dmd
Merge branch 'master' of github.com:D-Programming-Language/dmd
Merge branch 'master' of github.com:D-Programming-Language/dmd
Merge branch 'master' of github.com:D-Programming-Language/dmd
detab
fix Issue 9656 - Built-in dup result should behave as like unique array, if it is possible
fix Issue 10005 - struct variable declaration and const-correctness
fix Issue 10047 - opDispatch instantiation failure should be gagged for UFCS
fix Issue 10016 - Incorrect error gagging using RefCounted
fix Issue 10049 - Spurious "Label already defined" error inside a foreach over a range aggregate