Feature request: visual indication of proc-macro transitive dependencies

[inodentry]

It would be useful to have a visual indication of which of your crate's (transitive) dependencies are only used at compile time (by proc-macros) and do not contribute to the code of the compiled binary. This would allow easily judging which dependencies of a project actually contribute to code size.

One solution to this problem would be to visually indicate such dependencies with some marker (and maybe also use a different text colour) during the build process and to show a separate number in the total count of dependencies to be built.

There might also be other places in the UI where dependency info is indicated where this can be shown.

Perhaps crates.io could also benefit from such information, to allow easily judging how much a library might contribute to code bloat (count of non-proc-macro deps).and compile time (all deps).

[epage]

I feel like our build output is already fairly noisy and would be a poor spot for this. cargo tree does some rendering of information but not this exact use case.

It'd like be good for there to be experimentation out of tree to see what we should build directly into cargo for this.