Function rlang_eval_tidy 

extern "C" fn rlang_eval_tidy(
    expr: Sexp,
    _data: Sexp,
    env: Sexp,
) -> Sexp

Evaluate an expression in a tidy evaluation context.

Signature: SEXP rlang_eval_tidy(SEXP expr, SEXP data, SEXP env)

Simplified: just evaluate the expression in the given environment, ignoring the data mask. This is enough for basic purrr/dplyr usage.