diff --git a/internal/lsp/lsp_test.go b/internal/lsp/lsp_test.go
index 34d8316..3bb180f 100644
--- a/internal/lsp/lsp_test.go
+++ b/internal/lsp/lsp_test.go
@@ -182,10 +182,9 @@
 	// Get the diagnostics for this view if we have not done it before.
 	v := r.server.session.View(r.data.Config.Dir)
 	r.collectDiagnostics(v)
-	var got []*source.Diagnostic
-	for _, d := range r.diagnostics[uri] {
-		got = append(got, d)
-	}
+	d := r.diagnostics[uri]
+	got := make([]*source.Diagnostic, len(d))
+	copy(got, d)
 	// A special case to test that there are no diagnostics for a file.
 	if len(want) == 1 && want[0].Source == "no_diagnostics" {
 		if len(got) != 0 {
diff --git a/internal/lsp/source/options.go b/internal/lsp/source/options.go
index 0ce5fb7..c1084af 100644
--- a/internal/lsp/source/options.go
+++ b/internal/lsp/source/options.go
@@ -510,8 +510,8 @@
 	return result
 }
 
-func (options *Options) AddStaticcheckAnalyzer(a *analysis.Analyzer) {
-	options.StaticcheckAnalyzers[a.Name] = Analyzer{Analyzer: a, Enabled: true}
+func (o *Options) AddStaticcheckAnalyzer(a *analysis.Analyzer) {
+	o.StaticcheckAnalyzers[a.Name] = Analyzer{Analyzer: a, Enabled: true}
 }
 
 func (o *Options) set(name string, value interface{}) OptionResult {