$msg .= "at `" . $error->{location} . "': " . $error->{msg} . "\n\n";

        my $bindings = "";
        foreach my $arg (@{$error->{arg}}) {
            my $input = $inputInfo->{$arg->{name}}->[$arg->{altnr}] or die "invalid input";
            $bindings .= ", " if $bindings ne "";
            $bindings .= $arg->{name} . " = ";
            given ($input->{type}) {
                when ("string") { $bindings .= "\"" . $input->{value} . "\""; }
                when ("boolean") { $bindings .= $input->{value}; }
                default { $bindings .= "..."; }
            }
        }
        $msg .= "at `" . $error->{location} . "' [$bindings]:\n" . $error->{msg} . "\n\n";