::
and :::
are only permitted within certain contexts; the parser is currently permissive about where these tokens are found.
Equality operators (<
, <=
, >
, >=
, =
, !=
) can only occur once within the same level of an expression.
->
and ->>
need to be translated into <-
and <<-
when generating the R parse tree.
Remove it? It really just tries to check for parse errors but the parser itself is equipped to do that.
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