Specifically, the error is:
"Can't use string ("a") as a subroutine ref while "strict refs" in use
+ at line [eval { $result .= &{$_}(@time); };]"
If you must, you can turn off strict ("no strict 'refs'") immediately before that eval and turn it back on immediately after.
Update: Just another thought, why not store your subroutines in a hash where the format strings are the keys? Something like:
my %method_map = (a => sub { ... }, A => sub { ... } );
my $token = 'a'; # or 'A', 'D', etc.
my $result .= $method_map{$token}->(@args);
This is strict compatible and IMO is more maintainable code.
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