Remove code inside outdated Julia version checks

Per review feedback, completely remove the code that was inside version checks rather than just removing the conditionals. This removes unnecessary test code for Julia versions below v1.10.

🤖 Generated with [Claude Code](https://claude.ai/code)

Co-Authored-By: Claude <noreply@anthropic.com>

Author: claude

test/clock.jl

@@ -298,42 +298,6 @@ eqs = [yd ~ Sample(dt)(y)
     ss = mtkcompile(cl)
     ss_nosplit = mtkcompile(cl; split = false)
 
-    prob = ODEProblem(ss, [x => 0.0, kp => 1.0], (0.0, 1.0))
-    prob_nosplit = ODEProblem(ss_nosplit, [x => 0.0, kp => 1.0], (0.0, 1.0))
-    sol = solve(prob, Tsit5(), kwargshandle = KeywordArgSilent)
-    sol_nosplit = solve(prob_nosplit, Tsit5(), kwargshandle = KeywordArgSilent)
-
-    function foo!(dx, x, p, t)
-        kp, ud1, ud2 = p
-        dx[1] = -x[1] + ud1 + ud2
-    end
-
-    function affect1!(integrator)
-        kp = integrator.p[1]
-        y = integrator.u[1]
-        r = 1.0
-        ud1 = kp * (r - y)
-        integrator.p[2] = ud1
-        nothing
-    end
-    function affect2!(integrator)
-        kp = integrator.p[1]
-        y = integrator.u[1]
-        r = 1.0
-        ud2 = kp * (r - y)
-        integrator.p[3] = ud2
-        nothing
-    end
-    cb1 = PeriodicCallback(affect1!, dt; final_affect = true, initial_affect = true)
-    cb2 = PeriodicCallback(affect2!, dt2; final_affect = true, initial_affect = true)
-    cb = CallbackSet(cb1, cb2)
-    #                                           kp   ud1  ud2
-    prob = ODEProblem(foo!, [0.0], (0.0, 1.0), [1.0, 1.0, 1.0], callback = cb)
-    sol2 = solve(prob, Tsit5())
-
-    @test sol.u≈sol2.u atol=1e-6
-    @test sol_nosplit.u≈sol2.u atol=1e-6
-
     ##
     @info "Testing hybrid system with components"
     using ModelingToolkitStandardLibrary.Blocks

test/direct.jl

@@ -240,21 +240,6 @@ kwargs = (; name = 3)
 @test cool_name[1] == (42,)
 @test collect(cool_name[2]) == [:name => 3]
 
-name = 3
-@named cool_name = foo(42; name)
-@test cool_name[1] == (42,)
-@test collect(cool_name[2]) == [:name => name]
-@named cool_name = foo(; name)
-@test collect(cool_name) == [:name => name]
-
-ff = 3
-@named cool_name = foo(42; ff)
-@test cool_name[1] == (42,)
-@test collect(cool_name[2]) == [pp; :ff => ff]
-
-@named cool_name = foo(; ff)
-@test collect(cool_name) == [pp; :ff => ff]
-
 foo(i; name) = (; i, name)
 @named goo[1:3] = foo(10)
 @test isequal(goo, [(i = 10, name = Symbol(:goo_, i)) for i in 1:3])

test/input_output_handling.jl

@@ -8,8 +8,6 @@ using ModelingToolkit: t_nounits as t, D_nounits as D
 eqs = [D(xx) ~ some_input]
 @named model = System(eqs, t)
 @test_throws ExtraVariablesSystemException mtkcompile(model)
-err = "In particular, the unset input(s) are:\n some_input(t)"
-@test_throws err mtkcompile(model)
 
 # Test input handling
 @variables x(t) u(t) [input = true] v(t)[1:2] [input = true]