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`fel` checks that the failure event, counter and invariant are only modified inside the oracles it emits per-oracle goals for, using the statement-level write-set with those oracles excepted. `i_write_r` returned early on a call to an excepted oracle and dropped the call's lvalue, so `bad <@ o();` in the main body was not seen as a write to `bad` and an unsound bound could be derived. The lvalue is written by the caller regardless of the callee, so add it to the write-set before the `except` test. This matches the function-level write-set, which already counts call lvalues.
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felchecks that the failure event, counter and invariant are onlymodified inside the oracles it emits per-oracle goals for, using the
statement-level write-set with those oracles excepted.
i_write_rreturned early on a call to an excepted oracle and dropped the call's
lvalue, so
bad <@ o();in the main body was not seen as a write tobadand an unsound bound could be derived.The lvalue is written by the caller regardless of the callee, so add
it to the write-set before the
excepttest. This matches thefunction-level write-set, which already counts call lvalues.
Closes #1126