Leave arguments of infix operations tupled. #9159
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Leave arguments of infix operations tupled in desugaring. Untuple them in typer unless the function type is unary. This allows us to simply omit the operation in typer when auto tupling is disabled.
Untupling of infix operators is no longer under the noAutoTupling language feature. Instead, we always untuple if the infix operator is not unary. The idea is that, going forward we will gradually remove infix operators that are not unary. Once that is done completely, and there are no more backwards compatibility concerbs, the code to untuple arguments of infix operations will become dead code and can be removed.
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Leave arguments of infix operations tupled in desugaring. Untuple them in typer
unless the function type is unary. This allows us to simply omit the operation in typer
when non-unary infix operations are removed.