https://bugs.llvm.org/show_bug.cgi?id=49829
Bug ID: 49829
Summary: Incorrect error message for missing typename keyword
on dependent template alias instantiation
Product: clang
Version: trunk
Hardware: PC
OS: Linux
Status: NEW
Severity: enhancement
Priority: P
Component: C++
Assignee: unassignedclangb...@nondot.org
Reporter: matthewjbariche...@gmail.com
CC: blitzrak...@gmail.com, dgre...@apple.com,
erik.pilking...@gmail.com, llvm-bugs@lists.llvm.org,
richard-l...@metafoo.co.uk
Affected versions:
Note: The regression seems to have been introduced in 3.3 as versions < 3.3 do
not exhibit this issue.
- trunk
- 11.0.1
- 11.0.0
- 10.0.1
- 10.0.0
- 9.0.1
- 9.0.0
- 8.0.1
- 8.0.0
- 7.1.0
- 7.0.1
- 7.0.0
- 6.0.1
- 6.0.0
- 5.0.1
- 5.0.0
- 4.0.1
- 4.0.0
- 3.9.1
- 3.9.0
- 3.8.1
- 3.8
- 3.7.1
- 3.7
- 3.6
- 3.5.2
- 3.5.1
- 3.5
- 3.4.1
- 3.3
Driver cmdline:
clang++ -std=c++11
Code:
template<typename>
struct A {
template<typename = void>
using B = void;
};
template<typename T>
using C = A<T>::template B<>;
Expected behaviour:
An error message along the lines of "...missing typename keyword before ..."
Actual behaviour (error message):
<source>:8:11: error: expected a type
using C = A<T>::template B<>;
^
<source>:8:17: error: expected ';' after alias declaration
using C = A<T>::template B<>;
^
;
2 errors generated.
Notes:
- Changing the final 2 lines to the following, compiles as expected:
template<typename T>
using C = typename A<T>::template B<>;
- Possibly related to: https://bugs.llvm.org/show_bug.cgi?id=8446
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