Make the compiler produce correct namespaces #2235

Job	Run time
rubocop	33s
tests (ubuntu-latest, 3.2)	34s
tests (ubuntu-latest, head)	1m 14s
tests (ubuntu-latest, 3.3)	32s
tests (macos-latest, truffleruby-head)	1m 33s
tests (macos-latest, 3.3)	26s
tests (ubuntu-latest, truffleruby)	1m 37s
tests (ubuntu-latest, 3.4)	27s
tests (ubuntu-latest, truffleruby-head)	1m 30s
tests (macos-latest, 3.4)	30s
tests (macos-latest, head)	53s
tests (macos-latest, truffleruby)	1m 12s
tests (macos-latest, 3.2)	20s
	11m 21s

Provide feedback