Follow-up Comment #1, bug #60207 (project findutils):
For the record, comparison with other find implementations on that second
(symlink-based) example on the same system:
$ gnu-find -L . -name 'a*' -prune -o -print
.
./b1
find: ‘./a1’: Permission denied
./a1
./b2
find: ‘./a5’: Not a directory
find: ‘./a4’: Too many levels of symbolic links
$ busybox find -L . -name 'a*' -prune -o -print
.
./b1
find: ./a1: Permission denied
./b2
find: ./a5: Not a directory
find: ./a4: Too many levels of symbolic links
$ sfind -L . -name 'a*' -prune -o -print
.
./b1
./b2
$ heirloom-find -L . -name 'a*' -prune -o -print
.
./b1
heirloom-find: cannot follow symbolic link ./a3: No such file or directory
heirloom-find: cannot follow symbolic link ./a1: Permission denied
./b2
heirloom-find: cannot follow symbolic link ./a5: Not a directory
heirloom-find: cannot follow symbolic link ./a4: Too many levels of symbolic
links
(heirloom-find being the one from the "heirloom toolchest" based on
OpenSolaris, and sfind being from schily-tools).
See also these differences wrt to which files are reported without -prune:
$ find -L . -name 'a*'
./a3
find: ‘./a1’: Permission denied
./a1
find: ‘./a5’: Not a directory
./a5
find: ‘./a4’: Too many levels of symbolic links
./a2
$ busybox find -L . -name 'a*'
./a3
find: ./a1: Permission denied
find: ./a5: Not a directory
find: ./a4: Too many levels of symbolic links
./a2
$ sfind -L . -name 'a*'
./a3
./a1
./a5
./a4
./a2
$ heirloom-find -L . -name 'a*'
heirloom-find: cannot follow symbolic link ./a3: No such file or directory
heirloom-find: cannot follow symbolic link ./a1: Permission denied
heirloom-find: cannot follow symbolic link ./a5: Not a directory
heirloom-find: cannot follow symbolic link ./a4: Too many levels of symbolic
links
./a2
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