Created attachment 28025 [details]
reproduce -- fails in 4.7.0, works in 4.6.3

When a template class attempts to call a member's member function inside of a lambda function AND the member is referred to through an implicit this, the member will be erroneously const-qualified.

    struct Used
    {
        void foo() { }
    };

    template <typename>
    struct S
    {
        Used x;

        void bar()
        {
            auto f = [this] { x.foo(); };
            f();
        }
    };

Yields the following compilation error with g++ 4.7:

capture-this-const.cpp: In lambda function:
capture-this-const.cpp:13:27: error: no matching function for call to ‘Used::foo() const’
capture-this-const.cpp:13:27: note: candidate is:
capture-this-const.cpp:3:7: note: void Used::foo() <near match>
capture-this-const.cpp:3:7: note:   no known conversion for implicit ‘this’ parameter from ‘const Used*’ to ‘Used*’

---

This can be compiled properly by explicitly adding this->:

            auto f = [this] { this->x.foo(); };

---

$> g++ -v
Using built-in specs.
COLLECT_GCC=g++-4.7
COLLECT_LTO_WRAPPER=/usr/lib/gcc/x86_64-linux-gnu/4.7/lto-wrapper
Target: x86_64-linux-gnu
Configured with: ../src/configure -v --with-pkgversion='Ubuntu/Linaro 4.7.0-7ubuntu3' --with-bugurl=file:///usr/share/doc/gcc-4.7/README.Bugs --enable-languages=c,c++,go,fortran,objc,obj-c++ --prefix=/usr --program-suffix=-4.7 --enable-shared --enable-linker-build-id --with-system-zlib --libexecdir=/usr/lib --without-included-gettext --enable-threads=posix --with-gxx-include-dir=/usr/include/c++/4.7 --libdir=/usr/lib --enable-nls --disable-bootstrap --with-sysroot=/ --enable-clocale=gnu --enable-libstdcxx-debug --enable-libstdcxx-time=yes --enable-gnu-unique-object --enable-plugin --enable-objc-gc --disable-werror --with-arch-32=i686 --with-tune=generic --enable-checking=release --build=x86_64-linux-gnu --host=x86_64-linux-gnu --target=x86_64-linux-gnu
Thread model: posix
gcc version 4.7.0 (Ubuntu/Linaro 4.7.0-7ubuntu3)