installed.md
In pkgcache: Cache 'CRAN'-Like Metadata and R Packages

parse_description

Code
  parse_description(tempfile())
Condition
  Error in `parse_description()`:
  ! Cannot open file `<tempdir>/<tempfile>` (system error 2, No such file or directory) @lib.c:111 (pkgcache__read_file_raw) @lib.c:300 (pkgcache_parse_description)

parse_packages, errors

Code
  parse_packages(tempfile(), type = "uncompressed")
Condition
  Error in `parse_packages()`:
  ! Cannot open file `<tempdir>/<tempfile>` (system error 2, No such file or directory) @lib.c:111 (pkgcache__read_file_raw)