I’ve been learning OCaml for a compiler course, and while parsing s-expression I encountered the following scenario ... match (sexp_list : sexp list) with ... | Symbol(id)::rest when (id == keyword_add) -> (parse_binary Add ...) | Symbol(id)::rest when (id == keyword_sub) -> (parse_binary Sub ...) …

Just to be clear, adding computations to patterns is called active patterns . While it is possible to implement them in the language, their compilation will be very different. Right now, patterns are compiled into efficient decision trees, leveraging the fact that the pattern language is fully static…

Declare variable and evaluate expression within pattern

Learning

SkySkimmer January 16, 2020, 5:43pm 5

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Declare variable and evaluate expression within pattern

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