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Fixes #838
The problem was because of
test_node = test.updated(:send, [test, :===, cond]), wherecondis reused and given multiple times tosynthesizewhich results in updating the type of thecondnode.This PR introduces simplified transformation. The condition node is transformed using a fresh local variable
var_name. And the type ofvar_nameis propagated to the originalvalue_nodewhen it's type checking body of eachwhen/elseclauses.