[Bug c++/58549] [4.9 Regression] [c++1y] ICE with local function in function with auto parameter

[reichelt at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=58549

--- Comment #5 from Volker Reichelt <reichelt at gcc dot gnu.org> ---
It's a GNU extension, see comment #2 in PR58536.