restores the installation and use of preinstalled `.a` files.

There is no plan to remove any of these settings.

### Go 1.19

Go 1.19 made it an error for path lookups to resolve to binaries in the current directory,
controlled by the [`execerrdot` setting](/pkg/os/exec#hdr-Executables_in_the_current_directory).
There is no plan to remove this setting.

### Go 1.18

pkg go/doc, const AllDecls = 1
pkg go/doc, const AllMethods = 2
pkg go/doc, type Example struct, EmptyOutput bool
pkg go/doc, type Example struct, Order int
pkg go/doc, type Example struct, Play *ast.File
pkg go/doc, type Note struct
pkg go/doc, type Note struct, Body string
pkg go/doc, type Note struct, End token.Pos
pkg go/doc, type Note struct, Pos token.Pos
pkg go/doc, type Note struct, UID string

pkg debug/elf, method (*File) DynamicSymbols() ([]Symbol, error)
pkg debug/elf, var ErrNoSymbols error

# CL 106460044 debug/plan9obj, cmd/addr2line: on Plan 9 use a.out header, Aram Hăvărneanu <******@****.***>
pkg debug/plan9obj, type FileHeader struct, HdrSize uint64
pkg debug/plan9obj, type FileHeader struct, LoadAddress uint64