http://d.puremagic.com/issues/show_bug.cgi?id=2955

           Summary: Compiler rejects chained <>=
           Product: D
           Version: 1.041
          Platform: PC
        OS/Version: Linux
            Status: NEW
          Severity: normal
          Priority: P2
         Component: DMD
        AssignedTo: bugzilla@digitalmars.com
        ReportedBy: lijat.me@gmail.com


The following code

void main(){
        double a,b,c;
        assert(a <>= b <>= c);
}

gets this response from the compiler

johang@klaffhorn:~$ dmd test.d
test.d(4): found '<>=' when expecting ')'
test.d(4): found 'c' when expecting ';' following 'statement'
test.d(4): found ')' instead of statement
johang@klaffhorn:~$

if parenthesis are added the problem disappear.

If this is not valid code the a more helpful error message would be nice.


-- 

http://d.puremagic.com/issues/show_bug.cgi?id=2955


jarrett.billingsley@gmail.com changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|NEW                         |RESOLVED
         Resolution|                            |INVALID




------- Comment #1 from jarrett.billingsley@gmail.com  2009-05-09 10:31 -------
This is by design.  Comparison operators cannot be chained like this.  C accepts such foolishness as "a < b < c" even though it doesn't do what you'd expect (i.e. it doesn't evaluate to "a < b && b < c").  D changed all comparison operators to have the same precedence so that this kind of code would not be accepted, and for possible future expansion in which chained comparisons really would be converted into multiple clauses.


-- 

http://d.puremagic.com/issues/show_bug.cgi?id=2955





------- Comment #2 from lijat.me@gmail.com  2009-05-09 20:05 -------
In that case I think that a better error message would be needed. The current one left me confused about if it was a compiler bug or by design.


-- 

http://d.puremagic.com/issues/show_bug.cgi?id=2955


jarrett.billingsley@gmail.com changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
           Severity|normal                      |enhancement
             Status|RESOLVED                    |REOPENED
         Resolution|INVALID                     |




------- Comment #3 from jarrett.billingsley@gmail.com  2009-05-09 20:46 -------
Fair enough :)


-- 

http://d.puremagic.com/issues/show_bug.cgi?id=2955


Andrei Alexandrescu <andrei@metalanguage.com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|REOPENED                    |RESOLVED
                 CC|                            |andrei@metalanguage.com
         Resolution|                            |WONTFIX


--- Comment #4 from Andrei Alexandrescu <andrei@metalanguage.com> 2011-01-08 16:17:12 PST ---
I think we're good as we are.

-- 
Configure issuemail: http://d.puremagic.com/issues/userprefs.cgi?tab=email
------- You are receiving this mail because: -------