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ReShaper for example offers additions errors and hints / code analytics. One of those validates the views in ASP.NET.
If you try to return a view that does not exist (see sample), ReSharper adds red squiggles, and you get an additional error. With vanilla VS20xx there is not hint at all.

You just don't get a hint that e.g. a cshtml file, doesn't exist. This should be a compile error, but it is now just a runtime error.
With ReSharper the line is marked as error and its red:

Direct customer ask copying here: