Concat or add ~. Is this a bug?

Mar 21, 2005

jicman

Mar 21, 2005

Regan Heath

Mar 21, 2005

jicman

Mar 22, 2005

Regan Heath

Mar 22, 2005

Thomas Kuehne

Should this compile? it should, at least, gives me warnings. <code> 01. import std.stdio; 02. void TurnToMonDigit(char[] mon) 03. { 04. char[] mm; 05. mm = "I am trying to see if this also breaks" ~ mon ~ " more \n" ~ 06. "because this broke for me" ~ 07. "yep it did" ~ 08. "of course, new lines are needed\n"; 09. "new lines also\n"; 10. "this should not compile" ~ 11. " no it should not "; 12. writefln(mm); 13. 14. } 15. void main (char[][] args) 16. { 17. TurnToMonDigit("JUU"); 18. } </code> Note line 08 and 09. They have no variable assignment. It's just an empty ""; ""; but what causes me more trouble is what follows, "..." ~ "..." ~ "..." ~ "..."; a concatenation to nothing. Well, this was a bug in my program. :-) So, I wasn't testing or anything. :-) any ideas why this should compile? thanks, josé

On Mon, 21 Mar 2005 22:51:29 +0000 (UTC), jicman <jicman_member@pathlink.com> wrote: > Should this compile? No. IIRC a statement that is pointless or has no effect is an error. I can't, however, seem to find the part of the spec that says this, so I might be imagining it. > <code> > 01. import std.stdio; > 02. void TurnToMonDigit(char[] mon) > 03. { > 04. char[] mm; > 05. mm = "I am trying to see if this also breaks" ~ mon ~ " more \n" ~ > 06. "because this broke for me" ~ > 07. "yep it did" ~ > 08. "of course, new lines are needed\n"; > 09. "new lines also\n"; > 10. "this should not compile" ~ > 11. " no it should not "; > 12. writefln(mm); > 13. > 14. } > 15. void main (char[][] args) > 16. { > 17. TurnToMonDigit("JUU"); > 18. } > </code> Lines 8, 9, and 10 + 11 are pointless statements and should be errors. > but what causes me more trouble is what follows, > > "..." ~ > "..." ~ > "..." ~ > "..."; > > a concatenation to nothing. That's another pointless statement and should be an error. Regan

Well, it does... Plus, I kept thinking that Windows has memory problems (which I know it does, but this was no way to prove it. :-)) I kept looking as to why I was missing half of my prints! And couldn't understand why. Then I reaaaaaaally looked at the code and saw the bug. So... anyway, perhaps it should be fixed. josé Regan Heath says... > >On Mon, 21 Mar 2005 22:51:29 +0000 (UTC), jicman <jicman_member@pathlink.com> wrote: >> Should this compile? > >No. IIRC a statement that is pointless or has no effect is an error. I can't, however, seem to find the part of the spec that says this, so I might be imagining it. > >> <code> >> 01. import std.stdio; >> 02. void TurnToMonDigit(char[] mon) >> 03. { >> 04. char[] mm; >> 05. mm = "I am trying to see if this also breaks" ~ mon ~ " more \n" ~ >> 06. "because this broke for me" ~ >> 07. "yep it did" ~ >> 08. "of course, new lines are needed\n"; >> 09. "new lines also\n"; >> 10. "this should not compile" ~ >> 11. " no it should not "; >> 12. writefln(mm); >> 13. >> 14. } >> 15. void main (char[][] args) >> 16. { >> 17. TurnToMonDigit("JUU"); >> 18. } >> </code> > >Lines 8, 9, and 10 + 11 are pointless statements and should be errors. > >> but what causes me more trouble is what follows, >> >> "..." ~ >> "..." ~ >> "..." ~ >> "..."; >> >> a concatenation to nothing. > >That's another pointless statement and should be an error. > >Regan