Question

Is it possible to disable compiler warnings for specific lines?

In C#, this works:

[Obsolete]
class Old { }

#pragma warning disable 612
    var oldWithoutWarning = new Old();
#pragma warning restore 612
    var oldWithWarning = new Old();

This would be very useful for disabling incomplete pattern matches warnings, especially when a function accepts a particular case of a DU.

Answer 1

No, the warnings are turned off per-file (or possibly ‘from here to the bottom of the file’) when using #nowarn. (Or per compilation/project when using project properties / --nowarn command-line.)