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<http://lists.gnu.org/archive/html/help-bison/2007-09/msg00016.html>. * data/c++.m4: (b4_namespace_ref, b4_namespace_open, b4_namespace_close): New macros that interpret the %define variable "namespace" so its value can contain "::" to indicate nested namespaces. * data/glr.cc (b4_namespace): Don't define, and replace all uses with the above macros. * data/lalr1.cc (b4_namespace): Likewise. * data/location.cc (b4_namespace): Likewise. * doc/bison.texinfo (Decl Summary): Move `%define push_pull' entry inside a new table in the general %define entry. Document `%define namespace' there as well. Point the %name-prefix entry to it since it explains it more completely in the case of C++. (C++ Bison Interface): Mention `%define namespace' instead of %name-prefix. (Table of Symbols): Remove the `%define push_pull' entry. The %define entry suffices. * tests/c++.at (Relative namespace references): New test case. (Absolute namespace references): New test case. (Syntactically invalid namespace references): New test case. * tests/input.at (C++ namespace reference errors): New test case.