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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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Test/dafny0/Reads.dfy for benefits.
(Unfortunately, this loses track of the "postcondition might not hold on this return path" locations, see Test/dafny0/FunctionSpecifications.dfy.)
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precondition has otherwise been checked for well-formedness
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allows an improvement of the generated Boogie (which will be especially good soon, when reads-clause checking may change)
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Clément Pit--Claudel
Rustan Leino
Dan Rosén