rco
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Bug: ``, '', and "" can be used as SYMBOL
These are valid R expressions, they are parsed differently, and not being well-handled by rco.
`sum1` <- function(x, y) x + y
`sum1`(1, 2)
sum1(1, 2)
'sum2' <- function(x, y) x + y
'sum2'(1, 2)
sum2(1, 2)
"sum3" <- function(x, y) x + y
"sum3"(1, 2)
sum3(1, 2)