Alright, some progress. The problem with completion for std is really that RUST_SRC_PATH the checksums in Cargo.lock for lib.rs have unexpected values. If I go:
guix time-machine --branch=rust-team -- shell rust-analyzer -- which rust-analyzer and open that file, I can find out the location of RUST_SRC_PATH. By making a writeable copy of that directory and changing the Cargo.lock file at its root from the given one to the one I've attached [1] to this email. This solves the issue in the sense that after wrapping rust-analyzer appropriately according to the attached rust-analyzer launch script [2] -- this is necessary as without rust-analyzer-proc-macro-srv is not supposed to be launched by processses other than rust-analyzer. [1]
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[2]
#!/gnu/store/jlqbjxk51bdq5w7wlnbmwxm1j0pnllpx-bash-minimal-5.1.16/bin/bash
if test -z "${RUST_SRC_PATH}";then export RUST_SRC_PATH="/tmp/rust-lib-src";fi;
exec -a "$0"
"/nix/store/rna0p2yj36bds6yqjx51zqpzi7zfdkih-rust-analyzer-unwrapped-2025-01-20/bin/rust-analyzer"
"$@"
-- Good luck to you, Kabelo M'sobomvu Moiloa
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