Suffix for basic_string literals

[Marshall Clow]

Implements the "s" suffix for basic_string literals as called for in N3642 + tests.

Note that this does not build with current clang (even ToT), see discussion on CFE (subject "literal suffixes for std::basic_string").


-- Marshall

Marshall Clow     Idio Software   <mailto:mclow.lists at gmail.com>

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