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A general description is here.
New ‘lengths()’ function for getting the lengths of all elements in a list.
(Windows) Code changes have been made to allow R to be compiled with a
new toolchain based on GCC 4.9.2.
(Windows) The default toolchain for Windows is now based on GCC 4.9.2. Corresponding code changes and ‘Makefile’ changes have been made; see ‘src/gnuwin32/MkRules.dist’ for details.