davidot e5adc51e27 LibJS: Allow invalid string in tagged template literals ...

Since tagged template literals can inspect the raw string it is not a
syntax error to have invalid escapes. However the cooked value should be
`undefined`.
We accomplish this by tracking whether parse_string_literal
fails and then using a NullLiteral (since UndefinedLiteral is not a
thing) and finally converting null in tagged template execution to
undefined.

2022-08-17 23:56:24 +01:00

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