add_tstop! error

Author: ChrisRackauckas

src/integrators/integrator_interface.jl

@@ -40,7 +40,10 @@ u_cache(integrator::ODEIntegrator) = u_cache(integrator.cache)
 du_cache(integrator::ODEIntegrator)= du_cache(integrator.cache)
 full_cache(integrator::ODEIntegrator) = chain(user_cache(integrator),u_cache(integrator),du_cache(integrator.cache))
 default_non_user_cache(integrator::ODEIntegrator) = chain(u_cache(integrator),du_cache(integrator.cache))
-@inline add_tstop!(integrator::ODEIntegrator,t) = push!(integrator.opts.tstops,t)
+@inline function add_tstop!(integrator::ODEIntegrator,t)
+  t < integrator.t && error("Tried to add a tstop that is behind the current time. This is strictly forbidden")
+  push!(integrator.opts.tstops,t)
+end
 user_cache(cache::OrdinaryDiffEqCache) = (cache.u,cache.uprev,cache.tmp)
 
 resize!(integrator::ODEIntegrator,i::Int) = resize!(integrator,integrator.cache,i)