File: LAST_CONV.doc

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\DOC LAST_CONV

\TYPE {LAST_CONV : conv}

\SYNOPSIS
Computes by inference the result of taking the last element of a list.

\KEYWORDS
conversion, list.

\DESCRIBE
For any object language list of the form {"[x0;...x(n-1)]"} ,
the result of evaluating
{
   LAST_CONV "LAST [x0;...;x(n-1)]"
}
\noindent is the theorem
{
   |- LAST [x0;...;x(n-1)] = x(n-1)
}


\FAILURE
{LAST_CONV tm} fails if {tm} is an empty list.

\ENDDOC