Unable to use `"` or `'` characters in slash-delimited RegexLiteral after nesting two levels of macros

[syeopite]

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Bug Report

In the following example the " causes compilation to fail

{% begin %}
    \{% begin %}
        \\{% begin %}
            \\{% puts "hi\"".gsub(/"/, "").downcase %}
        \\{% end %}
    \{% end %}
{% end %}

with a

In test.cr:6:6                    

 6 | \{% end %}
      ^
Error: unknown token: '{'

This doesn't happen on earlier nest levels, and is also able to compile successfully when the double quote is replaced with any other character.

The same issue occurs with ' character

Occurs on 1.16.0 and a compiler built off master.

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The compiler is able to parse correctly when you use a %r though or interestingly enough when that character occurs within the slash delimited regex pattern like /%r(")/