[Bug c++/58536] [c++1y] ICE with auto in constructor

[reichelt at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=58536

--- Comment #2 from Volker Reichelt <reichelt at gcc dot gnu.org> ---
It's a GNU extension as mentioned in the ChangeLog:

2013-09-16  Adam Butcher  <a...@jessamine.co.uk>

    * cp-tree.h (type_uses_auto_or_concept): Declare.
    (is_auto_or_concept): Declare.
    * decl.c (grokdeclarator): Allow 'auto' parameters in lambdas with
    -std=gnu++1y or -std=c++1y or, as a GNU extension, in plain functions.
        [...]