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SUBSET_FORMALS

miniextendr_macros::miniextendr_impl::field_syntax

Constant SUBSET_FORMALS 

Source 
const SUBSET_FORMALS: &str = "x, i, ..., exact = TRUE";
Expand description

The formals of the S3 [[ reader: exact after ..., as [[.data.frame has it, so R matches it by name and ... holds only what the reader refuses (#2174).