The following program causes the Macro Stepper in Dr Racket to hang(it 
never opens):

#lang magic

2 ubyte <34 Targa image data

The code executes correctly as far as I can tell, but Macro Stepper doesn't 
like it. Changing "ubyte" to "byte" fixes the Macro Stepper problem. This 
problem has persisted across several versions of Racket but the latest I've 
tested with is

#lang magic can be installed from

I'm happy to help debug the problem.


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