1c786bcc82
Previously, typestate was initializing the init constraint for a declared-but-not-initialized variable (like x in "let x;") to False, but other constraints to Don't-know. This led to over-lenient results when a variable was used before declaration (see the included test case). Now, everything gets initialized to False in the prestate/poststate- finding phase, and Don't-know should only be used in pre/postconditions. This aspect of the algorithm really needs formalization (just on paper), but for now, this closes #700
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