On Monday, 29 June 2020 at 06:21:43 UTC, ag0aep6g wrote:

Since `local` and `writeln` are templates, the attributes for their parameters are inferred from their bodies. `local!(int*)` doesn't do anything with the parameter, so it's inferred as `scope`. `writeln!(int*)` apparently does something that prevents `scope` from being inferred.

Thanks. It would appear indeed that inference fails for some reason. Explicitly marking args as 'scope' for `writeln` and `File.write` lets them compile. I wonder if there's a way to find exactly what it is in either of those that prevents the compiler from inferring 'scope'.

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