Replaced builtin store function with a new syntax

src/core/CompileAssign.go

@@ -56,6 +56,13 @@ func (f *Function) CompileAssign(node *ast.Assign) error {
 				return err
 			}
 
+			leftSize := leftValue.Memory.Length
+			rightSize := uint8(rightValue.Type().Size())
+
+			if rightSize != 0 && leftSize != rightSize {
+				panic("memory store length mismatch")
+			}
+
 			f.ValueToMemory(rightValue, leftValue.Memory)
 			return nil
 		}