>>> Emerging : portage://dev-lang/spidermonkey-128.14.0:run?{[]}

These are the packages that would be merged, in order:

Calculating dependencies... done!

 └─step  1─┤ useflag portage://dev-lang/rust-bin-1.94.1 (llvm_slot_21)

 └─step  2─┤ download  portage://dev-build/autoconf-2.13-r9
             │           └─ file ─┤ 433.44 Kb  	 autoconf-2.13.tar.gz
             │ download  portage://dev-lang/rust-bin-1.94.1
             │           └─ file ─┤ 183.38 Mb  	 rust-1.94.1-x86_64-unknown-linux-gnu.tar.xz
             │ download  portage://dev-lang/spidermonkey-128.14.0
             │           └─ file ─┤ 536.65 Mb  	 firefox-128.14.0esr.source.tar.xz
             │                    │ 18.26 Kb  	 firefox-128esr-patches-11.tar.xz
             │                    │ 4.09 Kb  	 spidermonkey-128-patches-04.tar.xz
             │ download  portage://dev-libs/nspr-4.40
             │           └─ file ─┤ 985.34 Kb  	 nspr-4.40.tar.gz
             │ download  portage://dev-util/cbindgen-0.29.4
             │           └─ file ─┤ 6.06 Mb  	 cbindgen-0.29.4-crates.tar.xz
             │                    │ 246.72 Kb  	 cbindgen-0.29.4.tar.gz

Total: 6 actions (1 useflag, 5 downloads), grouped into 2 steps.
       727.73 Mb to be downloaded.


>>> Assumptions taken during proving & planning:

  USE flag change (1 package):
  Add to /etc/portage/package.use:
    dev-lang/rust-bin llvm_slot_21