Thanks. I wrote a rudimentary syntax transformer, but really I don't know the
best way to work around this -- and I'm not very proficient with syntax
transformers. I could put all of my code which I would prefer to be top level
in a procedure/let context, but I don't really think this is the solution I'm
looking for.
For example, I want to put some example data read by my port->list helper
procedure in the top level for experimenting, but I'm sure there are more
serious use cases for my issue.
Here's a very basic solution I just came up with. Any ideas would be
appreciated:
#lang typed/racket
(define-syntax guard
(syntax-rules ()
[(_ a b)
(let ()
(unless (a b)
(error "guard failed"))
b)]))
(define ls (port->list read (open-input-string "1 2 3 4")))
(for ([n (guard (λ (ls) (andmap number? ls)) ls)])
(displayln (* n n)))
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