digitalmars.D.bugs - [Issue 2614] New: auto + templated structs = unhelpful error messages
- d-bugmail puremagic.com (39/39) Jan 24 2009 http://d.puremagic.com/issues/show_bug.cgi?id=2614
- d-bugmail puremagic.com (4/4) Jan 25 2009 http://d.puremagic.com/issues/show_bug.cgi?id=2614
- d-bugmail puremagic.com (11/13) Jan 25 2009 http://d.puremagic.com/issues/show_bug.cgi?id=2614
- d-bugmail puremagic.com (15/15) Mar 01 2009 http://d.puremagic.com/issues/show_bug.cgi?id=2614
- d-bugmail puremagic.com (14/14) Apr 18 2011 http://d.puremagic.com/issues/show_bug.cgi?id=2614
- d-bugmail puremagic.com (10/10) Oct 20 2012 http://d.puremagic.com/issues/show_bug.cgi?id=2614
http://d.puremagic.com/issues/show_bug.cgi?id=2614 Summary: auto + templated structs = unhelpful error messages Product: D Version: unspecified Platform: PC OS/Version: Linux Status: NEW Severity: normal Priority: P2 Component: DMD AssignedTo: bugzilla digitalmars.com ReportedBy: andrei metalanguage.com struct S(T) { this(int x) { wrong_code; } } void main() { auto s = S!(int)(42); } Attempting to compile this code yields: ./test.d(4): struct test.S(T) is not a function template ./test.d(13): struct test.S(T) cannot deduce template function from argument types !(int)(int) This does not reveal where the problem is (namely, symbol wrong_code does not exist). I traced back the problem to the use of auto. If I change the line in main with: S!(int) s = S!(int)(42); then the error message becomes meaningful: ./test.d(7): Error: undefined identifier wrong_code ./test.d(7): Error: identifier has no effect in expression (wrong_code) ./test.d(13): template instance test.S!(int) error instantiating This is a killer in debugging larger templates with indirect instantiation patterns. --
Jan 24 2009
http://d.puremagic.com/issues/show_bug.cgi?id=2614Feh, I always forget what magic invocation creates a hyperlink so here's a regular url: http://d.puremagic.com/issues/show_bug.cgi?id=2510 And some more attempts issue 2510 number 2510 bug 2510 --
Jan 25 2009
http://d.puremagic.com/issues/show_bug.cgi?id=2614 The problem here is that S!(int)(42) can be either a template followed by (42), or a function template with argument list (42). The compiler cannot tell. So first it tries the former, and it silently fails (due to the wrong_code). Then, it figures it must be a function template, and tries that. That fails too, hence the error message you see. The reason: S!(int) s = S!(int)(42); gives a more correct message is the left S!(int) type is compiled first, and by the syntax the compiler knows it's not a function template, so instead of silently failing it verbosely fails. So what to do if both tries at instantiating it fail? Print the first error message, or the second? One will not make sense. --
Mar 01 2009
http://d.puremagic.com/issues/show_bug.cgi?id=2614 Kenji Hara <k.hara.pg gmail.com> changed: What |Removed |Added ---------------------------------------------------------------------------- CC| |k.hara.pg gmail.com Trunk dmd(Commit:2e261cd640e5266c569ad224ffbfe229a0315d97) prints following messages. test.d(5): Error: undefined identifier wrong_code test.d(11): Error: template instance test.S!(int) error instantiating I think this issue was resolved. -- Configure issuemail: http://d.puremagic.com/issues/userprefs.cgi?tab=email ------- You are receiving this mail because: -------
Apr 18 2011
http://d.puremagic.com/issues/show_bug.cgi?id=2614 Andrej Mitrovic <andrej.mitrovich gmail.com> changed: What |Removed |Added ---------------------------------------------------------------------------- Status|NEW |RESOLVED CC| |andrej.mitrovich gmail.com Resolution| |FIXED -- Configure issuemail: http://d.puremagic.com/issues/userprefs.cgi?tab=email ------- You are receiving this mail because: -------
Oct 20 2012