std_msgs is used at run time in 8 crates.

Depender (with downloads and own rev deps) std_msgs version
diagnostic_msgs ^1.2.1
6 geometry_msgs ^4.2.3
lanelet_msgs ^4.2.3
nav_msgs ^4.2.3
2 sensor_msgs ^4.2.3
shape_msgs ^4.2.3
stereo_msgs ^4.2.3
visualization_msgs ^4.2.3