1 files changed, 22 insertions, 0 deletions
diff --git a/script/core/diagnostics/unused-label.lua b/script/core/diagnostics/unused-label.lua
new file mode 100644
index 00000000..e6d998ba
--- /dev/null
+++ b/script/core/diagnostics/unused-label.lua
@@ -0,0 +1,22 @@
+local files  = require 'files'
+local guide  = require 'parser.guide'
+local define = require 'proto.define'
+local lang   = require 'language'
+
+return function (uri, callback)
+    local ast = files.getAst(uri)
+    if not ast then
+        return
+    end
+
+    guide.eachSourceType(ast.ast, 'label', function (source)
+        if not source.ref then
+            callback {
+                start   = source.start,
+                finish  = source.finish,
+                tags    = { define.DiagnosticTag.Unnecessary },
+                message = lang.script('DIAG_UNUSED_LABEL', source[1]),
+            }
+        end
+    end)
+end