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[Bug c++/13407] New: Confusing error message from extraneous typename
- From: "austern at apple dot com" <gcc-bugzilla at gcc dot gnu dot org>
- To: gcc-bugs at gcc dot gnu dot org
- Date: 16 Dec 2003 00:03:43 -0000
- Subject: [Bug c++/13407] New: Confusing error message from extraneous typename
- Reply-to: gcc-bugzilla at gcc dot gnu dot org
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