recover

evaluates a body and handles raised values

Invokes the zero-argument procedure body. If evaluation raises or panics, the runtime normalizes the error and passes the resulting Ale value to the single-argument procedure rescue. This is the procedural building block used by higher-level error macros such as try.

An Example

(recover
  (thunk (raise "boom"))
  (lambda (err) (str "caught: " err)))