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  1. or download this
    my %function = (
  sumsq => sub  { my $sum = 0; foreach(@_) { $sum += $_*$_; } return $
+sum; },  # sum of squares
  sqrt => sub { return sqrt shift; },
);
  2. or download this
        if(/\G((?i:[a-z]\w*))\s*\(/gc) {  # function '('
        my $function = $1;
...
        trace(sprintf "function '$function' called with %d argument%s"
+, scalar @arg, @arg==1 ? "" : "s");
        return $function{$function}->(@arg);
    }
  3. or download this
    Line 29 "·sumsq(3,2+2)*sqrt(36)"
Line 29 "sumsq(·3,2+2)*sqrt(36)"
...
Line 45 "sumsq(3,2+2)*sqrt(36)·" result = 150
150
Stack: This value is never affected