gistfile1.diff

diff --git a/lint.go b/lint.go
index a13129c..6320b24 100644
--- a/lint.go
+++ b/lint.go
@@ -188,6 +188,7 @@ func (f *file) lint() {
 	f.lintTimeNames()
 	f.lintContextKeyTypes()
 	f.lintContextArgs()
+	f.lintDeferInForLoop()
 }
 
 type link string
@@ -1598,3 +1599,23 @@ func srcLine(src []byte, p token.Position) string {
 	}
 	return string(src[lo:hi])
 }
+
+// lintDeferInForLoop examines using defer in for loop.
+func (f *file) lintDeferInForLoop() {
+	var infor bool
+
+	f.walk(func(n ast.Node) bool {
+		switch v := n.(type) {
+		case *ast.FuncDecl, *ast.FuncLit:
+			infor = false
+			return true
+		case *ast.ForStmt:
+			infor = true
+			return true
+		case *ast.DeferStmt:
+			f.errorf(v, 1, category("defer"), "should not use defer in for loop")
+			return true
+		}
+		return true
+	})
+}