Change to system calls - Githubissues

Proposal:

change from

var x set to system.readKey() or set y to system.readKey()

system readykey() into x system random(pack) into card

Where x can be new or existing variable. If existing, the type must be compatible

Advantages:

better prompting to the user
makes a clearer distinction from function call (the system method name is on the LHS of the statement)
has its own frame, which enforces the rules, and which is available only in the context of mainor `procedure'
avoids need to classify system call as a sub-type of expressionin the grammar
We could then allow user to define their own systemmethods (similar syntax to function), but may contain systemor procedure calls

system deal() as Card
  var deck set to {"Ac","2c","3c",...,"Ks"}
  system random(deck) into card
  return card
end system

elan-language / Documentation