id summary reporter owner description type status milestone component version severity resolution keywords cc 13378 VC++ 14 compiler warning C4456: declaration of 'it' hides previous local declaration Volker Schöch Barend Gehrels "I am using Microsoft Visual Studio 15.5.1 (VCToolsVersion 14.12.25827) to compile boost 1.66.0. I use compiler flag /W4. The following warning (which we declared an error for our project) occurs in geometry: **\boost_1_66_0\boost\geometry\algorithms\detail\overlay\handle_colocations.hpp(315): warning C4456: declaration of 'it' hides previous local declaration**" Bugs closed To Be Determined geometry Boost 1.66.0 Problem fixed warning, C4456