[Bug c++/54170] Call to lambda elided

[jason at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=54170

--- Comment #14 from Jason Merrill <jason at gcc dot gnu.org> ---
The patch does seem safe enough for 4.7, even though I usually prefer not to
backport C++11 fixes to older release series.