Never flag _ as an unknown identifier
#804
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tree-sitter parses this as an `identifier` node to keep things simple in the grammar, rather than parsing it as something like a `pipe_placeholder` within a pipe scope, which would be tough to do right. So we have to adapt to that here and always avoid flagging `_` as an unknown symbol.
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Addresses posit-dev/positron#3749
Addresses posit-dev/positron#4102
tree-sitter parses this as an
identifiernode to keep things simple in the grammar, rather than parsing it as something like apipe_placeholderwithin a pipe scope, which would be tough to do right. So we have to adapt to that here and always avoid flagging_as an unknown symbol.