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  1. or download this
    use Math::Symbolic qw/parse_from_string/;

...
my $value;
eval { $value = $ms->value() };
if ($@) {...} # catch execution errors
  2. or download this
    # parse...

...
my $value;
eval { $value = $ms->value() };
if ($@) {...} # catch execution errors
  3. or download this
    # parse...

# note the parens for list context
my ($coderef) = $ms->to_sub();
my $value = $coderef->();