[Issue 11481] New: Clearly note all explicit casts are forwarded to `alias this` if there is no `opCast`

[d-bugmail at puremagic.com]

https://d.puremagic.com/issues/show_bug.cgi?id=11481

           Summary: Clearly note all explicit casts are forwarded to
                    `alias this` if there is no `opCast`
           Product: D
           Version: D2
          Platform: All
        OS/Version: All
            Status: NEW
          Keywords: spec
          Severity: major
          Priority: P2
         Component: websites
        AssignedTo: nobody at puremagic.com
        ReportedBy: verylonglogin.reg at gmail.com


--- Comment #0 from Denis Shelomovskij <verylonglogin.reg at gmail.com> 2013-11-09 16:39:36 MSK ---
People tend to think explicit cast behaves as no-op if there is an implicit
one. Documentation must clearly note it's wrong and `opCast` is tried to be
called.

Also a list of operations rewritten as explicit cast like `if(someStruct)` must
be provided as people tend to forget invisible explicit casts exist.

Appendix:
* Filed invalid bugs because of this: Issue 3537, Issue 6777, Issue 7985, Issue
9151.
* Lockup mechanics explanation by Kenji Hara: Comment 2 of Issue 11161.

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