Online version of Why3
    This version of Why3 is intended for teaching purposes.
    
    The WhyML language is
    described in the Why3
    manual.
    
Verifying a program
    
    Click on the gears button to launch the verification.
    Verification conditions (VCs) then appear in the right panel, in
    the Task List tab, and
    Alt-Ergo is run on each of them with a default time limit (that
    can be set in the Settings menu).
    
    
    When a VC is not proved, there are several options:
    
      -  use the contextual menu to rerun Alt-Ergo with a larger
      time limit (e.g. 1000 or 5000 steps instead of 100);
      
-  use the contextual menu to split the VC and rerun Alt-Ergo
      on each sub-VC (split and prove);
      
-  use the Task View tab to investigate the problematic VC,
      for wrong or missing elements of specification (precondition,
      postcondition, invariant);
      
-  add intermediate assertions in the code, using //@
      assert ...;.