[llvm-bugs] [Bug 31821] New: Inconsistent error message for unqualifed address of member

[via llvm-bugs]

https://llvm.org/bugs/show_bug.cgi?id=31821

            Bug ID: 31821
           Summary: Inconsistent error message for unqualifed address of
                    member
           Product: clang
           Version: unspecified
          Hardware: PC
                OS: Linux
            Status: NEW
          Severity: enhancement
          Priority: P
         Component: C++
          Assignee: unassignedclangbugs at nondot.org
          Reporter: tdelisle at uwaterloo.ca
                CC: dgregor at apple.com, llvm-bugs at lists.llvm.org
    Classification: Unclassified

When given the following code, clang generates an error and proposes a fix to
the given error :
   
-----------------------------------------------------------------------------------------
    class parent { protected:
    virtual void foo() = 0;
    };

    template<typename T> class child : public parent {
    void (parent::*foo_ptr)() = &foo;
    };

   
-----------------------------------------------------------------------------------------
    $ clang private.cpp -std=c++11 
    private.cpp:7:30: error: must explicitly qualify name of member function
when taking its address
            void (parent::*foo_ptr)() = &foo;
                                        ^~~~
                                         parent::
    1 error generated.


Updating the code according to the error message still fails :

   
-----------------------------------------------------------------------------------------
    class parent { protected:
    virtual void foo() = 0;
    };

    template<typename T> class child : public parent {
    void (parent::*foo_ptr)() = &parent::foo;
    };

   
-----------------------------------------------------------------------------------------
    $ clang private.cpp -std=c++11 
    private.cpp:6:39: error: 'foo' is a protected member of 'parent'
            void (parent::*foo_ptr)() = &parent::foo;
                                             ^
    private.cpp:2:15: note: must name member using the type of the current
context 'child<T>'
            virtual void foo() = 0;
                         ^
    1 error generated.

The error messages should be consistent and propose fixes that will not
generate more errors.

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