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Synopsis Retrieve a tuple field by its index position.
Syntax Exp1 [ Exp2 ]
Description Subscription retrieves the tuple element with index Exp2 from the tuple value of Exp1.
Examples Introduce a tuple, assign it to T and retrieve the element with index 0: 
rascal>T = <"mon", 1>;
tuple[str,int]: <"mon",1>
rascal>T[0];
str: "mon"
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