Adding Parser trait
#513
Merged
Adding Parser trait
#513
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This PR adds a
Parsertrait, and changesMetta::runto accept anyimpl Parserinstead of aSExprParserI gathered this was a direction we want to go anyway, to allow additional syntaxes.
However my reason for needing this change right now is that the module loader needs a way to retain ownership of text before it's parsed, but keeping the text buffer along-side the parser would result in a self-referential object. So this change lets me create an
OwningSExprParserthat owns the text it's parsing.This is a tiny step towards merging the module system.