For the following procedure, I would like to assign a constant to a signal/variable port when calling a procedure. When I've got some helper procedures that I use in a verification library, I might sometimes want to default the enable to `'1'`, but not provide it as a default value for the signal/variable in the procedure declaration. In the below case, I might be using the `en` port as an overload for another very similar procedure, so putting default on the `en` port doesn't always solve the problem. Reference the example procedure below: ``` procedure example( signal clk : in std_logic; signal en : in std_logic ) is begin <code here> end procedure; ``` Now, I would like to call the procedure with a constant value for the enable like so: ``` example(clk, '1'); ``` This should also support an actual `constant` type as well.