Parse error on `{{!` mustache comment in `.gts`

[chancancode]

<template>
  {{!
    like this
  }}
</template>

Parse error on line 2:
...                  {{!                  
-----------------------^
Expecting 'OPEN_SEXPR', 'ID', 'STRING', 'NUMBER', 'BOOLEAN', 'UNDEFINED', 'NULL', 'DATA', got 'INVALID'glint

[chancancode]

@NullVoxPopuli you tried this on #655? I would think the problem is that Glint is using too old a version of @glimmer/syntax, not because of the stuff content-tag would fix

[chancancode]

I think prettier wants to format into this style out of the box so this is somewhat of a blocker in converting .hbs files with comments

[dfreeman]

We have examples of this parsing fine in general (e.g. here), so this may need a more detailed reproduction

[chancancode]

Aha, you are right, it requires a back tick inside the comment, so @NullVoxPopuli is right that this is in fact #655 territories

export default class Foo {
  <template>{{! ` }}</template>
}