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d16c34fb4a
This is a workaround for anyone building Ceres in an environment where there is a non-standard string implementation in the global namespace. Due to the way the standard is written, a "using namespace X" import is not high enough precedence to resolve a naked reference to "string". Instead, by explicitly importing string, the lookup becomes unambiguous. Change-Id: I8d70463de01c482796c5bc09da05b37d21e7af96