Type Alias BoxedValidatorFn 

pub type BoxedValidatorFn = Box<dyn Fn(&[u8]) -> Option<bool>>;

The optional auto-detection probe for a Closure parser — same contract as Parse::is_format_supported.

Given the raw bytes, return Some(true) if confident, Some(false) if definitely not this format, or None to abstain. The default (when none is set) abstains with None.

Aliased Type

pub struct BoxedValidatorFn(/* private fields */);