The Field2d class (added midway through the 2020 season) was moved from the simulation package ( .simulation / frc/simulation/) to the SmartDashboard package ( .smartdashboard / frc/SmartDashboard/). Teams defining their own custom constraints should mark the MaxVelocity() and MinMaxAcceleration() methods as const. Trajectory constraint methods are now const in C++.
Curvature_t moved from frc to units namespace (C++)
