update

Author: isaacsas

src/Catalyst.jl

@@ -26,7 +26,7 @@ import Symbolics: BasicSymbolic
 using Symbolics: iscall, sorted_arguments
 using ModelingToolkit: Symbolic, value, get_unknowns, get_ps, get_iv, get_systems,
                        get_eqs, get_defaults, toparam, get_var_to_name, get_observed,
-                       getvar
+                       getvar, has_iv
 
 import ModelingToolkit: get_variables, namespace_expr, namespace_equation, get_variables!,
                         modified_unknowns!, validate, namespace_variables,

src/reactionsystem.jl

@@ -1415,9 +1415,9 @@ function ModelingToolkit.compose(sys::ReactionSystem, systems::AbstractArray; na
     @set! sys.systems = [get_systems(sys); systems]
     newunknowns = OrderedSet{BasicSymbolic{Real}}()
     newparams = OrderedSet()
-    iv = MT.has_iv(sys) ? MT.get_iv(sys) : nothing
+    iv = has_iv(sys) ? get_iv(sys) : nothing
     for ssys in systems
-        collect_scoped_vars!(newunknowns, newparams, ssys, iv)
+        MT.collect_scoped_vars!(newunknowns, newparams, ssys, iv)
     end
 
     if !isempty(newunknowns)