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Dafny counts from 0, but Boogie counts from 1. Tokens are 1-based. Thus when we
print tokens, we need to decrement the column number. This was done for resolver
errors, but not for verification or parsing errors. In addition, parsing errors
were inconsistent with resolution errors case-wise.
Unfortunately, the fix affects the output of many tests.
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i.e., how many times Z3 is permitted to unfold it's definition. The
new {:fuel} annotation can be added to the function itself, it which
case it will apply to all uses of that function, or it can overridden
within the scope of a module, function, method, iterator, calc, forall,
while, assert, or assume. The general format is:
{:fuel functionName,lowFuel,highFuel}
When applied as an annotation to the function itself, omit functionName.
If highFuel is omitted, it defaults to lowFuel + 1.
The default fuel setting for recursive functions is 1,2. Setting the fuel higher,
say, to 3,4, will give more unfoldings, which may make some proofs go through
with less programmer assistance (e.g., with fewer assert statements), but it may
also increase verification time, so use it with care. Setting the fuel to 0,0 is
similar to making the definition opaque, except when used with all literal arguments.
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qunyanm
Bryan Parno
Clément Pit--Claudel