Fix type inference issue with uncurried functions applied to a single… #5970
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… unit argument. In the example the inferred for `func()` was the return type `int` instead of the type `unit => int` because the application `()` was omitted, as the heuristic for application of a function with only optional args would mistakenly fire.
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… unit argument.
In the example
the type inferred for
funcwas the return typeintinstead of the typeunit => intbecause the application()was omitted, as the heuristic for application of a function with only optional args would mistakenly fire.