Never apply to double splat params or splat params without names

spec/ameba/rule/typing/method_param_type_restriction_spec.cr

@@ -8,6 +8,35 @@ module Ameba::Rule::Typing
       def hello(a : String) : String
         "hello world" + a
       end
+
+      def hello(*a : String) : String
+        "hello world" + a.join(", ")
+      end
+      CRYSTAL
+  end
+
+  it "fails if a splat method param with a name doesn't have a type restriction" do
+    expect_issue subject, <<-CRYSTAL
+      def hello(*a) : String
+               # ^ error: Method parameter should have a type restriction
+        "hello world" + a
+      end
+      CRYSTAL
+  end
+
+  it "passes if a splat param without a name doesn't have a type restriction" do
+    expect_no_issues subject, <<-CRYSTAL
+      def hello(hello : String, *, world : String = "world") : String
+        hello + world + a
+      end
+      CRYSTAL
+  end
+
+  it "passes if a double splat method param doesn't have a type restriction" do
+    expect_no_issues subject, <<-CRYSTAL
+      def hello(a : String, **world) : String
+        "hello world" + a
+      end
       CRYSTAL
   end
 

src/ameba/rule/typing/method_param_type_restriction.cr

@@ -67,7 +67,7 @@ module Ameba::Rule::Typing
       return if valid?(node)
 
       node.args.each do |arg|
-        next if arg.restriction || (!default_value? && arg.default_value)
+        next if arg.restriction || (!default_value? && arg.default_value) || arg.name.empty?
 
         issue_for arg, MSG, prefer_name_location: true
       end