front end - Having variables appear aqua in user defined function

In many of the inbuilt mathematica function, variables appear aqua like in:

enter image description here

However, when creating your own function, variables no longer have that green coloring and are instead colored like an undefined variable

enter image description here

Is there any way to define functions so that variables used in arguments like in the manner above can get the aqua syntax coloring?

Answer

You can use SyntaxInformation. In this case,

SyntaxInformation[Lim] = {"ArgumentsPattern" -> {_, _, OptionsPattern[]}, 
   "LocalVariables" -> {"Limit", {2}}}

does what you want.

Comments

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