2014-03-26 2:33 GMT+09:00 Andrei Alexandrescu <[email protected] >:
> After the recent discussions regarding the comma operator, and after > inspecting the patterns of code affected by it, Walter and I would back up > the following change to the D language: > > 1. The comma operator stays with its current syntax. > > 2. The semantics is the same unless warnings are enabled with "-w" > > 3. In "-w" mode, semantics are changed in that the type of the comma > operator is NOT the type of its last expression, but instead it's void. > > 4. Later on the warning will be promoted to a deprecation followed by > removal from the language. > > 5. Reintroducing the result type as a tuple remains a future possibility. > > We believe the change would be beneficial for the following reasons: > > 1. Based on druntime and phobos, the breakage is likely to be infrequent. > > 2. The change may catch (and has caught) important bugs caused by > misplacing closing parentheses. > > 3. Most code using the result of the comma expression looks foreign even > to seasoned programmers and might gain in clarity from a refactor. > > > Please reply to discuss this possibility. Sounds good. Typing comma expressions as void would be a good way. Kenji Hara
