const go/parser.ImportsOnly

4 uses

	go/parser (current package)
		interface.go#L53: 	ImportsOnly                                       // stop parsing after import declarations
		parser.go#L2876: 		if p.mode&ImportsOnly == 0 {

	go/build
		read.go#L441: 	info.parsed, info.parseErr = parser.ParseFile(info.fset, info.name, info.header, parser.ImportsOnly|parser.ParseComments)

	golang.org/x/tools/go/packages
		golist_overlay.go#L389: 	f, err := parser.ParseFile(token.NewFileSet(), filename, contents, parser.ImportsOnly) // TODO(matloob): reuse fileset?