Nothing
Code
err(parse_expr(""))
Output
<error/rlang_error>
Error in `parse_expr()`:
! `x` must contain exactly 1 expression, not 0.
Code
err(parse_expr("foo; bar"))
Output
<error/rlang_error>
Error in `parse_expr()`:
! `x` must contain exactly 1 expression, not 2.
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