I'm building a crate with cargo rustc like this:

And it worked well so far. Now I needed to add -Znext-solver to RUSTFLAGS, but it doesn't have effect, I'm still getting this from dependencies:

  error: `generic_const_args` requires -Znext-solver=globally to be enabled
    --> crates/shared/ab-merkle-tree/src/lib.rs:36:5
     |
  36 |     generic_const_args,
     |     ^^^^^^^^^^^^^^^^^^
     |
     = help: enable all of these features

I'm quite confused by this since --cfg flags definitely work, but -Znext-solver clearly doesn't.

What am I missing?

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