This is an unofficial snapshot of the ISO/IEC JTC1 SC22 WG21 Core Issues List revision 112b. See http://www.open-std.org/jtc1/sc22/wg21/ for the official list.
[Moved to DR at the October, 2012 meeting.]
The requirements for a trivial class include having “a trivial default constructor” (Clause 11 [class] paragraph 6). However, with an explicitly-defaulted default constructor and other constructors with default arguments, it is possible to have multiple default constructors. Such a class cannot be default-initialized and thus should probably be considered non-trivial.
Proposed resolution (February, 2012):
Change Clause 11 [class] paragraph 6 as follows:
...A trivial class is a class that has a
trivialdefault constructor (11.4.5 [class.ctor]) and is trivially copyable...