extern_spec_std_time_Instant_checked_duration_since

creusot_contracts::std::time

Function extern_spec_std_time_Instant_checked_duration_since 

Source 
pub fn extern_spec_std_time_Instant_checked_duration_since(
    self_: &Instant,
    earlier: Instant,
) -> Option<Duration>
Expand description

extern spec for ::std::time::Instant::checked_duration_since

This is not a real function: its only use is for documentation.

terminates

ghost

ensures 

self@ >= earlier@ ==> result != None

ensures 

self@ < earlier@ ==> result == None