Raise error on invalid snippet name

lib/liquid/tags/snippet.rb

@@ -10,7 +10,7 @@ module Liquid
   # @liquid_description
   #   You can create inline snippets to make your Liquid code more modular.
   # @liquid_syntax
-  #   {% snippet input %}
+  #   {% snippet snippet_name %}
   #     value
   #   {% endsnippet %}
   class Snippet < Block
@@ -19,6 +19,7 @@ module Liquid
       p = @parse_context.new_parser(markup)
       if p.look(:id)
         @to = p.consume(:id)
+        p.consume(:end_of_string)
       else
         raise SyntaxError, options[:locale].t("errors.syntax.snippet")
       end

test/integration/tags/snippet_test.rb

@@ -468,6 +468,18 @@ class SnippetTest < Minitest::Test
 
       assert_template_result(expected, template)
     end
+
+    def test_snippet_with_invalid_identifier
+      template = <<~LIQUID
+        {% snippet header foo bar %}
+          Invalid
+        {% endsnippet %}
+      LIQUID
+
+      exception = assert_raises(SyntaxError) { Liquid::Template.parse(template) }
+
+      assert_match("Expected end_of_string but found id", exception.message)
+    end
   end
 
   class RigidMode < SnippetTest
@@ -934,7 +946,7 @@ class SnippetTest < Minitest::Test
       assert_template_result(expected, template, error_mode: :rigid)
     end
 
-    def test_render_with_invalid_identifier_type
+    def test_render_with_invalid_identifier
       template = "{% render 123 %}"
 
       exception = assert_raises(SyntaxError) do
@@ -954,14 +966,18 @@ class SnippetTest < Minitest::Test
       assert_match("Expected a string or identifier, found nothing", exception.message)
     end
 
-    def test_render_with_invalid_identifier
-      template = "{% render 123 %}"
+    def test_snippet_with_invalid_identifier
+      template = <<~LIQUID
+        {% snippet header foo bar %}
+          Invalid
+        {% endsnippet %}
+      LIQUID
 
       exception = assert_raises(SyntaxError) do
         Liquid::Template.parse(template, error_mode: :rigid)
       end
 
-      assert_match("Expected a string or identifier, found 123", exception.message)
+      assert_match("Expected end_of_string but found id", exception.message)
     end
   end