Bump golang.org/x/tools/gopls from 0.14.2 to 0.15.0

[dependabot]

Bumps golang.org/x/tools/gopls from 0.14.2 to 0.15.0.

Release notes

Sourced from golang.org/x/tools/gopls's releases.

gopls/v0.15.0

These release notes are mostly identical to the v0.15.0-pre.3 prerelease notes. Thanks to all who tested the prerelease!

go install golang.org/x/tools/[email protected]

This release introduces "zero config" gopls, which is a set of heuristics allowing gopls to Do The Right Thing when you open a Go file. We believe this addresses two of the largest pain points we hear about from our users: difficulty configuring multi-module repositories, and working on multiple GOOS/GOARCH combinations. However, this is a large change to the way gopls models your workspace, and the dynamic loading/unloading of builds may be surprising in some cases. Your feedback on this new feature is greatly appreciated. See below for more details.

New Features

Simpler workspace configuration and improved build tag support

The headline feature of this release is a rewrite of gopls's logic for associating files with build configurations that enables gopls to give accurate answers when navigating almost any Go source file on your machine.

Most features of gopls rely on type information, which comes not from the file in isolation but depends on the relationship between the file and the other files in its package, and between the package and all its dependencies; this in turn depends on go.mod and go.work files. In effect, gopls needs to decide which go build command--which working directory, package arguments, GOOS, GOARCH, build tags, and so on--would cause each file to be processed by the compiler.

Previous versions of gopls only allowed one build per workspace folder, and users had to be careful to configure the right workspace root and build environment. As a result, users often encountered confusing error messages when they opened the wrong directory, or a file that was tagged for a different operating system or architecture--the dreaded "No packages found" error. This situation was improved by the introduction of go.work files, but still required configuration and a preexisting understanding of the code being edited.

With this release, gopls now allows multiple builds per workspace, and uses heuristics to automatically derive the set of active builds. Gopls will ensure that an active build contains every module with an open file in your workspace, adding new builds and GOOS/GOARCH combinations as needed to cover files that don't match the host operating system or architecture.

For example, suppose we had a repository with three modules: moda, modb, and modc, and a go.work file using modules moda and modb. If we open the files moda/a.go, modb/b.go, moda/a_windows.go, and modc/c.go, gopls will automatically create three builds:

This allows gopls to just work when you open a Go file, but it does come with several caveats:

• This causes gopls to do more work, since it is now tracking three builds instead of one. However, the recent scalability redesign allows much of this work to be avoided through efficient caching.
• For operations originating from a given file, including finding references and implementations, gopls executes the operation in the default build for that file. For example, finding references to a symbol S from foo_linux.go will return references from the Linux build, and finding references to the same symbol S from foo_windows.go will return references from the Windows build. This is done for performance reasons, as in the common case one build is sufficient, but may lead to suprising results. golang/go#65757 and golang/go#65755 propose improvements to this behavior.
• When selecting a GOOS/GOARCH combination to match a build-constrained file, gopls will choose the first matching combination from this list. In some cases, that may be surprising.
• When working in a GOOS/GOARCH constrained file that does not match your default toolchain, CGO_ENABLED=0 is implicitly set. This means that gopls will not work in files including import "C". golang/go#65758 may lead to improvements in this behavior.
• gopls is not able to guess build flags that include arbitrary user-defined build constraints. For example, if you are trying to work on a file that is constrained by the build directive //go:build special, gopls will not guess that it needs to create a build with "buildFlags": ["-tags=special"]. golang/go#65089 proposes a heuristic by which gopls could handle this automatically.

We hope that you provide feedback on this behavior by upvoting or commenting the issues mentioned above, or opening a new issue for other improvements you'd like to see.

Preview refactoring edits

Refactoring code actions now support resolving edits. This update enables features like code action previews within VS Code (triggered by Ctrl+Enter).

To take advantage of this new gopls feature, clients must register support via:

{
	"textDocument": {
		"codeAction": {
			"dataSupport": true,
			"resolveSupport": {
				"properties": ["edit"]
			}
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Commits

• 729e159 go.mod: update golang.org/x dependencies
• 38ed81a gopls/internal/regtest/marker: porting extract tests
• bbf8380 gopls/internal/regtest/marker: use golden diffs for suggested fixes
• 51df92b go/ssa: two minor cleanups
• e7fb31a internal/cmd/deadcode: rename -format to -f
• c538b4e internal/cmd/deadcode: add -whylive=function flag
• b753e58 internal/lsp/helper: fix misspelled "Code generated" comment
• 2638d66 internal/cmd/deadcode: omit package/func keywords in default output
• 118c362 gopls/internal/lsp/source: fix signatureHelp with pointer receivers
• 4124316 gopls/internal/lsp/cache: remove baseCtx from the View
• Additional commits viewable in compare view

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