[nem-en] try-catch is expression?

[Dmitry Ivankov]

So it becomes a feature request to improve yielding: analyze what local
variables can be left local when transformed to yielding method. This will
require some workflow+usage analysis.

P.S. Of course, there is another workaround for more complex cases: mutable
flag; try {flag = true} catch {_ => flag = false};, i.e. anything except
assign will work, local fun will work too i suppose.
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