[duped]

It's not philosophical, it is literal.

Rust macros and build.rs require build commands to be executed by the rust compiler (cargo check, for example).

These are third party tools that have been implemented to execute build commands during initialization. It's not an issue with Rust, it's an issue with the implementation of the language client and text editor allowing the client to initialize when opening a workspace.

[j4yav]

What I mean is that my definition of build time is more things that happen when you are running a build. If you do build time things at other times then I don’t personally consider them build time activities any more. You have converted your build time activities into something more general at that point.

They may be spiritually or metaphorically still build steps in some sense, but they are happening outside that context.