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Improve handling of anonymous function expressions.
This makes walk call visit_fn_{pre,post} on function expressions in addition to item functions (updating the interface so that they take an option::t[ident] for the function name (a lot of typestate code needed to be superficially altered)) and updates my earlier fix to type inference in lambdas to make use of this.
As a side effect, this fixes a bug where typestate would not properly be run on lambda functions.