fix Issue 2438 - Cannot get types of delegate properties
fix Issue 4225 - forward reference of opCall (mangle.c:81: char* mangle(Declaration*): Assertion `fd && fd->inferRetType' failed.)
fix Issue 4423 - [tdpl] enums of struct types
fix Issue 6699 - More cases of __error in error messages
fix Issue 7477 - Enum structs without specified values
fix Issue 10629 - [ICE](dt.c 106) with void array
fix Issue 10928 - Fails to create closures that reference structs with dtor
fix Issue 13217 - nothrow, template function and delegate: compilation error