"// +build wireinject" cause gopls error

[ymchun]

Describe the bug

If we have a go file that call wire.Build, we put a build constraint to the start of the file. The gopls will prompt the following message saying that no packages found.

No packages found for open file /some/path/wire.go: <nil>.
If this file contains build tags, try adding "-tags=<build tag>" to your gopls "buildFlag" configuration (see (https://github.com/golang/tools/blob/master/gopls/doc/settings.md#buildflags-string).
Otherwise, see the troubleshooting guidelines for help investigating (https://github.com/golang/tools/blob/master/gopls/doc/troubleshooting.md).

If we remove the empty line between the build constraint and the package, it behave like the issue described here #117

To Reproduce

// +build wireinject

package cmd

Expected behavior

No warnings.

Version

go version go1.16 darwin/amd64

Additional context

My vscode settings

{
  "go.lintOnSave": "workspace",
  "go.lintTool": "golangci-lint",
  "go.useLanguageServer": true,
  "go.formatTool": "goimports",
  "[go]": {
    "editor.formatOnSave": true,
    "editor.codeActionsOnSave": {
      "source.organizeImports": true
    },
    "editor.snippetSuggestions": "none"
  },
  "[go.mod]": {
    "editor.formatOnSave": true,
    "editor.codeActionsOnSave": {
      "source.organizeImports": true
    }
  },
  "gopls": {
    "usePlaceholders": true,
    "staticcheck": false
  },
}