[rubygems/rubygems] Improve error message when `path` and `gemspec` p… #44

Job	Run time
cargo clippy	37s
make (zjit-bindgen, To fix: use patch in logs, --enable-zjit=dev --with-gcc=clang-14, /usr/lib/ll...	5m 50s
make (zjit-check, --enable-yjit --enable-zjit=dev, 1.85.0)	4m 41s
make (test, --enable-zjit=dev, --zjit-call-threshold=1)	6m 24s
make (zjit-test-all, --enable-zjit=dev, --seed=18140)	9m 40s
ZJIT Ubuntu result	2s
	27m 14s

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