Highlighting issue about dhall-mode HOT 4 OPEN

Really? The tutorial says:

These "double single quote strings" ignore all special characters, with one exception: if you want to include a '' in the string, you will need to escape it with a preceding ' (i.e. use ''' to insert '' into the final string).

This indicates that your example code should use '''${FOO}.

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(Not saying that that case would be handled properly either, but still...)

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The tutorial also says:

If you need to insert a "${" into a string without interpolation then use "''${" (same as Nix)

''
    for file in *; do
      echo "Found ''${file}"
    done
''

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Cool, okay. I think this requires some work on the syntax fontification functions.

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