7fc89f573d
I noticed that typestate was being lazier than it should be, because it was only checking typestate for statements and top-level expression (that is, the expression in a stmt_expr, but not any subexpressions). So I rewrote the checks in tstate/ck.rs to use walk, which exposed a few bugs in typestate that I fixed. Also added some more test cases for if-check.
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