Fix check of undeclared types in any operators #1105
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Bug introduced in be290ed. Notice that desugaring of any operators occurs before type checking. Previous code, `SI.add id ty_vars`, does not work because it leads to incorrect positions being reported in error messages.
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Bug introduced in be290ed. Notice that desugaring of any operators occurs before type checking. Previous code,
SI.add id ty_vars, does not work because it leads to incorrect positions being reported in error messages.