So the test was wrong :-)

spec/shortcodes_spec.cr

@@ -43,6 +43,7 @@ describe "Shortcodes" do
     result.errors.size.should eq 0
     result.shortcodes[0].whole.should eq "{{% sc %}} >}}blah {{% /sc %}}"
     result.shortcodes[0].data.should eq " >}}blah "
+    result.shortcodes[0].args.size.should eq 0
   end
 
   it "should accept mismatched brackets in qvals" do
@@ -125,12 +126,11 @@ describe "Shortcodes" do
     result.shortcodes[0].whole.should eq "{{% shortcode foo \"bar\" 42 bat=v1 baz=\"v2\" %}}"
   end
 
-  # // BUG?
-  # // Ensure(parse, escaped_shortcode)
-  # // {
-  # //     char *input = "foobar \\{{% shortcode %}}";
-  # //     result = parse(input);
-  # //     // No shortcodes
-  # //     assert_that(result.sc[0].name.len, is_equal_to(0));
-  # // }
+  # BUG?
+  # it "should ignore escaped shortcodes" do
+  #   input = "foobar \\{{% shortcode %}}blah"
+  #   result = parse(input)
+  #   result.shortcodes.size.should eq 0
+  #   result.errors.size.should eq 0
+  # end
 end