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Based on work by Frank Heckenbach. See http://lists.gnu.org/archive/html/bug-bison/2018-04/msg00000.html and http://lists.gnu.org/archive/html/bug-bison/2018-09/msg00019.html. * data/lalr1.cc (b4_rhs_value): Use YY_MOVE api.rhs.automove is set. * doc/bison.texi (%define Summary): Document api.rhs.automove. * examples/variant-11.yy: Use it. * tests/local.at (AT_AUTOMOVE_IF): New. * tests/c++.at (Variants): Check move semantics.