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.
[Accepted as a DR as part of paper P0588R1 at the October, 2017 meeting.]
According to 7.5.5 [expr.prim.lambda] paragraph 9,
A lambda-expression whose smallest enclosing scope is a block scope (6.4.3 [basic.scope.block]) is a local lambda expression; any other lambda-expression shall not have a capture-list in its lambda-introducer. The reaching scope of a local lambda expression is the set of enclosing scopes up to and including the innermost enclosing function and its parameters.
Consequently, lambdas appearing in mem-initializers and brace-or-equal-initializers cannot have a capture-list. However, these expressions are evaluated in the context of the constructor and are permitted to access this and non-static data members.
Should the definition of a local lambda be modified to permit capturing lambdas within these contexts?
Notes from the April, 2013 meeting:
CWG agreed with the intent of this issue.