Diff missing generated file stderr message

[rglKali]

What do you want to change?

I've mentioned, that sqlc diff behaves differently on file change / removal. As far as both changing / deleting file will cause the generated code to be invalid, it might be useful to print a short message to the stderr, when the file is missing

What database engines need to be changed?

No response

What programming language backends need to be changed?

No response