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<maname>
Hi, racket newbie incoming! I'm having trouble to understand the following code. In particular, I don't understand why the code begins with "#s((ExpressionStatement ..." rather than with one parenthesis "#s(ExpressionStatement ..." . Code: https://pkos98.dev/storage/ast.rkt?render=code
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<ifs[m]>
Hey maname! This doesn't look like "vanilla" Racket to me, where is that from ? :)
<ifs[m]>
`(ExpressionStatement Statement 0 Term 1)` might evaluating to a function, which is then applied to what follows ?
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<maname>
ifs[m]: you are right, actually it is the string representation of an AST structure from the parsing lib.
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<maname>
So, usually transparent structs are represented by "#s(StructName arg0...argN)"
<ifs[m]>
* 1)` might be evaluating to
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<tonyg>
maname: you've got it. It's a prefab struct - but it's one that is a subtype of another struct.
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<tonyg>
rudybot: eval (struct base (field1 field2) #:prefab)
<rudybot>
tonyg: Done.
<tonyg>
rudybot: eval (struct derived base (field3 field4) #:prefab)
<tonyg>
maname: so the prefab key of the struct is usually a symbol, when there's no inheritance, but can be a list describing the various level of inheritance and which fields belong to which level.
<maname>
many thanks!!
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