Validate static asserts

[Paul Backus]

On Friday, 9 September 2022 at 14:35:33 UTC, Andrey Zherikov 
wrote:
> I have bunch of `static assert(<condition>, <message>)` in my 
> code and would like to validate that specific code triggers 
> specific assert by checking what `<message>` is thrown.

It sounds like maybe your goal here is to test that attempting to 
compile a specific piece of code will result in a specific error 
message being *shown to the user*.

Unfortunately, the D compiler does not allow you to introspect on 
error messages, so it is impossible to write a `unittest` that 
covers this requirement. Instead, you will have to write an 
external script or program that attempts to compile a test 
program and checks the output for the expected error message.