Fix if statements hoisting, now that send is working

Same same, just have to remembe to actually execute the condition if it is a send
Having send a possible expression, removes one tmp variable and associated move, for a little extra work.
Next return and assign (rest)

test/vool/test_assignment.rb

@@ -0,0 +1,95 @@
+require_relative "helper"
+
+module Vool
+  class TestAssignMom < MiniTest::Test
+    include VoolCompile
+
+    def setup
+      Parfait.boot!(Parfait.default_test_options)
+      @compiler = compile_first_method( "local = 5")
+      @ins = @compiler.mom_instructions.next
+    end
+
+    def test_class_compiles
+      assert_equal Mom::SlotLoad , @ins.class , @ins
+    end
+    def test_slot_is_set
+      assert @ins.left
+    end
+    def test_slot_starts_at_message
+      assert_equal :message , @ins.left.known_object
+    end
+    def test_slot_gets_self
+      assert_equal :frame , @ins.left.slots[0]
+    end
+    def test_slot_assigns_to_local
+      assert_equal :local , @ins.left.slots[-1]
+    end
+    def test_slot_assigns_something
+      assert @ins.right
+    end
+    def test_slot_assigns_int
+      assert_equal Mom::IntegerConstant ,  @ins.right.known_object.class
+    end
+  end
+
+  #otherwise as above, but assigning instance, so should get a SlotLoad
+  class TestAssignMomInstanceToLocal < MiniTest::Test
+    include VoolCompile
+    def setup
+      Parfait.boot!(Parfait.default_test_options)
+      @compiler = compile_first_method( "@a = 5 ; local = @a")
+      @ins = @compiler.mom_instructions.next
+    end
+    def test_class_compiles
+      assert_equal Mom::SlotLoad , @ins.next.class , @ins
+    end
+  end
+
+  #compiling to an argument should result in different second parameter in the slot array
+  class TestAssignToArg < MiniTest::Test
+    include VoolCompile
+
+    def setup
+      Parfait.boot!(Parfait.default_test_options)
+      @compiler = compile_first_method( "arg = 5")
+      @ins = @compiler.mom_instructions.next
+    end
+
+    def test_class_compiles
+      assert_equal Mom::SlotLoad , @ins.class , @ins
+    end
+    def test_slot_is_set
+      assert @ins.left
+    end
+    def test_slot_starts_at_message
+      assert_equal :message , @ins.left.known_object
+    end
+    def test_slot_gets_self
+      assert_equal :arguments , @ins.left.slots[0]
+    end
+    def test_slot_assigns_to_local
+      assert_equal :arg , @ins.left.slots[-1]
+    end
+  end
+
+  class TestAssignMomToInstance < MiniTest::Test
+    include VoolCompile
+    def setup
+      Parfait.boot!(Parfait.default_test_options)
+    end
+    def test_assigns_const
+      @compiler = compile_first_method( "@a = 5")
+      @ins = @compiler.mom_instructions.next
+      assert_equal Mom::SlotLoad , @ins.class , @ins
+      assert_equal Mom::IntegerConstant , @ins.right.known_object.class , @ins
+    end
+    def test_assigns_move
+      @compiler = compile_first_method( "@a = arg")
+      @ins = @compiler.mom_instructions.next
+      assert_equal Mom::SlotLoad , @ins.class , @ins
+      assert_equal Mom::SlotDefinition , @ins.right.class , @ins
+    end
+  end
+
+end