refactor: do not use @mtkmodel

Author: AayushSabharwal

lib/ModelingToolkitBase/test/common/rc_model.jl

@@ -2,26 +2,27 @@ import ModelingToolkitStandardLibrary.Electrical as El
 import ModelingToolkitStandardLibrary.Blocks as Bl
 using SciCompDSL
 
-@mtkmodel RCModel begin
-    @parameters begin
+@component function RCModel(; name)
+    pars = @parameters begin
         R = 1.0
         C = 1.0
         V = 1.0
     end
-    @components begin
+    systems = @named begin
         resistor = El.Resistor(R = R)
         capacitor = El.Capacitor(C = C)
         shape = Bl.Constant(k = V)
         source = El.Voltage()
         ground = El.Ground()
     end
-    @equations begin
+    eqs = [
         connect(shape.output, source.V)
         connect(source.p, resistor.p)
         connect(resistor.n, capacitor.p)
         connect(capacitor.n, source.n)
         connect(capacitor.n, ground.g)
-    end
+    ]
+    System(eqs, t, [], pars; systems, name)
 end
 
 @named rc_model = RCModel()

lib/ModelingToolkitBase/test/odesystem.jl

@@ -1028,13 +1028,14 @@ end
 
     # the same, but with @mtkmodel
     @independent_variables x
-    @mtkmodel MyModel begin
-        @variables begin
+    @component function MyModel(; name)
+        vars = @variables begin
             y(x)
         end
-        @equations begin
+        eqs = [
             y ~ 0
-        end
+        ]
+        return System(eqs, t, vars, []; name)
     end
     @test_nowarn @mtkcompile sys = MyModel()