bug#59002: Bug from profile path name?

[Greg Hogan]

With an '@' character in the profile path I see the following error.

(the reason for using the full package@version in the profile path is
to preserve successfully built packages when garbage collecting during
testing of updates to dependent packages)

Greg

$ guix install -p ~/profile/llvm@14 llvm@14
The following package will be installed:
   llvm 14.0.6

The following derivation will be built:
  /gnu/store/bvybwzjn6gzvkcyg77lxc1cjk13h41vk-profile.drv

building CA certificate bundle...
listing Emacs sub-directories...
building fonts directory...
The following builds are still in progress:
  /gnu/store/f9q36dx4xlaw4d9m9cfl57v7623dng4d-fonts-dir.drv
  /gnu/store/7lr81m696k1xbdkpchxjnlxzsr76svh3-emacs-subdirs.drv

building directory of Info manuals...
The following builds are still in progress:
  /gnu/store/mhd4jwqyjcsq6nfccnya8jirfaf8pm6f-info-dir.drv
  /gnu/store/f9q36dx4xlaw4d9m9cfl57v7623dng4d-fonts-dir.drv

The following build is still in progress:
  /gnu/store/mhd4jwqyjcsq6nfccnya8jirfaf8pm6f-info-dir.drv

building profile with 1 package...
hint: Backtrace:
          18 (primitive-load "/home/ec2-user/.config/guix/current/bi…")
In guix/ui.scm:
   2263:7 17 (run-guix . _)
  2226:10 16 (run-guix-command _ . _)
In ice-9/boot-9.scm:
  1752:10 15 (with-exception-handler _ _ #:unwind? _ # _)
In guix/status.scm:
    835:3 14 (_)
    815:4 13 (call-with-status-report _ _)
In guix/store.scm:
   1300:8 12 (call-with-build-handler _ _)
   1300:8 11 (call-with-build-handler #<procedure 7f9809626990 at g…> …)
In guix/build/syscalls.scm:
   1433:3 10 (_)
   1400:4  9 (call-with-file-lock/no-wait _ _ _)
In guix/scripts/package.scm:
    325:7  8 (build-and-use-profile _ "/home/ec2-user/profile/llvm@…" …)
In guix/ui.scm:
    312:5  7 (display-hint _ _)
  1448:24  6 (texi->plain-text _)
In texinfo.scm:
  1132:22  5 (parse _)
   980:31  4 (loop #<input: string 7f97f8aa84d0> (*fragment*) _ _ _)
   911:31  3 (loop #<input: string 7f97f8aa84d0> #f #<procedure ide…> …)
   754:31  2 (_ #<input: string 7f97f8aa84d0> _ (example # # lisp …) …)
     92:2  1 (read-command-token #<input: string 7f97f8aa84d0>)
In ice-9/boot-9.scm:
  1685:16  0 (raise-exception _ #:continuable? _)

ice-9/boot-9.scm:1685:16: In procedure raise-exception:
Throw to key `parser-error' with args `(#<input: string 7f97f8aa84d0>
"Nonalphabetic @-command char: '" #\1 "'")'.