El 09/07/15 a les 16:51, Gabriel Riba ha escrit:
Trying to use mutually recursive values don't compile, giving the error:
syntax error: replacing AND with UNDER
Parse failure
----------
Here is a sample to try with:
val rec even (i:int) = if i = 0 then True
else if i > 0 then odd (i -1)
else error <xml>error: negative input</xml>
and val rec odd (i:int) = if i = 0 then False
else if i > 0 then even (i -1)
else error <xml>error: negative input</xml>
I am sorry, I see it was my fault, as the syntax is defined in the
manual as
val rec (id : type = expr "and")+
I should have written:
val rec even (i:int) = if i = 0 then True
else if i > 0 then odd (i -1)
else error <xml>error: negative input</xml>
and odd (i:int) = if i = 0 then False
else if i > 0 then even (i -1)
else error <xml>error: negative input</xml>
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