Add to_c_str_opt/with_c_str_opt functions and fix an ICE#17435

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kaseyc wants to merge 1 commit intorust-lang:masterfrom kaseyc:fix_c_str_ice

+109-22

Commits on Sep 22, 2014

Add to_c_str_opt and with_c_str_opt functions to the ToCStr trait. These functions return an Option if
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