Reporting the position of the last valid token #37
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The point of adding the previous location is enabling proper syntax highlighting. For that use, not only the location of the error is required, but also the point up to which the code was valid.
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This PR aims to provide the location info of the token facing the one where a parse error occured.
To this end, another line of text is added to the parse error, in the form of
The implementation has been tested against a set of cases originally from LuaMinify, with more corner cases added as they come up during manual testing.