This is an unofficial snapshot of the ISO/IEC JTC1 SC22 WG21 Core Issues List revision 112e. See http://www.open-std.org/jtc1/sc22/wg21/ for the official list.
[Voted into the WP at the March, 2011 meeting.]
According to 6.3 [basic.def.odr] paragraph 2,
A declaration is a definition unless it declares a function without specifying the function's body (9.5 [dcl.fct.def]), it contains the extern specifier (9.2.2 [dcl.stc]) or a linkage-specification25 (9.11 [dcl.link]) and neither an initializer nor a function-body...
Because = delete and = default are not forms of function-body, this description does not cover defaulted and deleted functions, even though these declarations are elsewhere referred to as being definitions.
Proposed resolution (January, 2011):
Change the grammar in 9.5.1 [dcl.fct.def.general] paragraph 1 as follows: