[Bug c++/13407] New: Confusing error message from extraneous typename

[Bug c++/13407] New: Confusing error message from extraneous typename

[austern at apple dot com]

Consider the following code sample:
    struct A { };
    struct B { typedef A Type; };

    template <typename T>
    struct X : public typename T::Type
    { };

    X<B> x;

The mainline compiler gives the following error messages:
bc.cc:5: error: expected class-name
bc.cc:5: error: expected `{'
bc.cc:6: error: expected unqualified-id
bc.cc:6: error: expected `;'
...

An error message is appropriate, since the code really is wrong.  However, a naive user (even a 
sophisticated user!) would be hard pressed to figure out the real reason for this cascade of errors: 
'typename' is forbidden in a base-specifier.

This is a regression from 3.3.  The 3.3 error messages were pretty bad too, but at least they gave a 
hint that the problem had something to do with 'typename'.

-- 
           Summary: Confusing error message from extraneous typename
           Product: gcc
           Version: 3.4
            Status: UNCONFIRMED
          Severity: normal
          Priority: P2
         Component: c++
        AssignedTo: unassigned at gcc dot gnu dot org
        ReportedBy: austern at apple dot com
                CC: gcc-bugs at gcc dot gnu dot org
 GCC build triplet:  i686-pc-linux-gnu
  GCC host triplet:  i686-pc-linux-gnu
GCC target triplet:  i686-pc-linux-gnu


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=13407

[Bug c++/13407] Confusing error message from extraneous typename

[bangerth at dealii dot org]

------- Additional Comments From bangerth at dealii dot org  2003-12-16 08:05 -------
Confirmed. I think the error messages of 3.3 and 3.4 are 
equally bad, so wouldn't rate this a regression. It would 
be nice to have this improved nevertheless. 
 
W. 

-- 
           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |gdr at gcc dot gnu dot org
             Status|UNCONFIRMED                 |NEW
     Ever Confirmed|                            |1
  GCC build triplet| i686-pc-linux-gnu          |i686-pc-linux-gnu
   GCC host triplet| i686-pc-linux-gnu          |i686-pc-linux-gnu
 GCC target triplet| i686-pc-linux-gnu          |i686-pc-linux-gnu
           Keywords|                            |diagnostic
   Last reconfirmed|0000-00-00 00:00:00         |2003-12-16 08:05:03
               date|                            |


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=13407

[Bug c++/13407] Confusing error message from extraneous typename

[pinskia at gcc dot gnu dot org]

-- 
           What    |Removed                     |Added
----------------------------------------------------------------------------
           Severity|normal                      |enhancement


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=13407

[Bug c++/13407] Confusing error message from extraneous typename

[giovannibajo at libero dot it]

------- Additional Comments From giovannibajo at libero dot it  2004-01-16 03:19 -------
Mine!

-- 
           What    |Removed                     |Added
----------------------------------------------------------------------------
         AssignedTo|unassigned at gcc dot gnu   |giovannibajo at libero dot
                   |dot org                     |it
             Status|NEW                         |ASSIGNED


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=13407

[Bug c++/13407] Confusing error message from extraneous typename

[giovannibajo at libero dot it]

------- Additional Comments From giovannibajo at libero dot it  2004-01-16 03:21 -------
Patch submitted, waiting for review:
http://gcc.gnu.org/ml/gcc-patches/2004-01/msg01545.html

-- 


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=13407

[Bug c++/13407] Confusing error message from extraneous typename

[cvs-commit at gcc dot gnu dot org]

------- Additional Comments From cvs-commit at gcc dot gnu dot org  2004-01-16 12:29 -------
Subject: Bug 13407

CVSROOT:	/cvs/gcc
Module name:	gcc
Changes by:	giovannibajo@gcc.gnu.org	2004-01-16 12:29:41

Modified files:
	gcc/cp         : ChangeLog parser.c 

Log message:
	PR c++/13407
	* parser.c (cp_parser_base_specifier): Check for an invalid
	keyword 'typename' and emit an user-friendly error message.

Patches:
http://gcc.gnu.org/cgi-bin/cvsweb.cgi/gcc/gcc/cp/ChangeLog.diff?cvsroot=gcc&r1=1.3886&r2=1.3887
http://gcc.gnu.org/cgi-bin/cvsweb.cgi/gcc/gcc/cp/parser.c.diff?cvsroot=gcc&r1=1.156&r2=1.157



-- 


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=13407

[Bug c++/13407] Confusing error message from extraneous typename

[cvs-commit at gcc dot gnu dot org]

------- Additional Comments From cvs-commit at gcc dot gnu dot org  2004-01-16 12:33 -------
Subject: Bug 13407

CVSROOT:	/cvs/gcc
Module name:	gcc
Changes by:	giovannibajo@gcc.gnu.org	2004-01-16 12:33:29

Modified files:
	gcc/testsuite  : ChangeLog 
Added files:
	gcc/testsuite/g++.dg/parse: typename6.C 

Log message:
	PR c++/13407
	* g++.dg/parse/typename6.C: New test.

Patches:
http://gcc.gnu.org/cgi-bin/cvsweb.cgi/gcc/gcc/testsuite/ChangeLog.diff?cvsroot=gcc&r1=1.3383&r2=1.3384
http://gcc.gnu.org/cgi-bin/cvsweb.cgi/gcc/gcc/testsuite/g++.dg/parse/typename6.C.diff?cvsroot=gcc&r1=NONE&r2=1.1



-- 


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=13407

[Bug c++/13407] Confusing error message from extraneous typename

[giovannibajo at libero dot it]

------- Additional Comments From giovannibajo at libero dot it  2004-01-16 12:34 -------
Fixed in GCC 3.4.0!

-- 
           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|ASSIGNED                    |RESOLVED
         Resolution|                            |FIXED
   Target Milestone|---                         |3.4.0


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=13407