use v5.40;

use Try::Tiny qw( try catch );

...

{
   # Code that hasn't been converted to 5.40 yet, for example.
   no feature qw( try );

   try { ... };   
}

...

##</code><code>##

use Try::Tiny qw( try catch );

...

{
   use feature qw( try );

   try { ... } catch ( $e ) { ... }
}

...