Closes#8071
Release Notes:
- Changed the Go integration to check whether an existing `gopls` was compiled for the current `go` version.
Previously we cached gopls (the go language server) as a file called
`gopls_{GOPLS_VERSION}`. The go version that gopls was built with is
crucial, so we need to cache the go version as well.
It's actually super interesting and very clever; gopls uses go to parse
the AST and do all the analyzation etc. Go exposes its internals in its
standard lib (`go/parser`, `go/types`, ...), which gopls uses to analyze
the user code. So if there is a new go release that contains new
syntax/features/etc. (the libraries `go/parser`, `go/types`, ...
change), we can rebuild the same version of `gopls` with the new version
of go (with the updated `go/xxx` libraries) to support the new language
features.
We had some issues around that (e.g., range over integers introduced in
go1.22, or custom iterators in go1.23) where we never updated gopls,
because we were on the latest gopls version, but built with an old go
version.
After this PR gopls will be cached under the name
`gopls_{GOPLS_VERSION}_go_{GO_VERSION}`.
Most users do not see this issue anymore, because after
https://github.com/zed-industries/zed/pull/8188 we first check if we can
find gopls in the PATH before downloading and caching gopls, but the
issue still exists.
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