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Precondition checking analysis #127

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Precondition checking analysis #127

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victornicolet
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This PR adds a new "precondition checking analysis" (see docs/12_syntactic.md). This allows the user to express constraints where functions can only be called under certain conditions, and those conditions are simple expressions that depend only on the output of a function call.

Future improvements to this analysis includes:

  • a proper representation for the preconditions (path formulas), both internally and in the user interface.
  • some optimizations in how the path formulas are computed and checked.

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@samarth-aws samarth-aws Awaiting requested review from samarth-aws

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