LWG3785 ranges::to is over-constrained on the destination type being a range

Author: burblebee

source/ranges.tex

@@ -2300,7 +2300,8 @@
 constructed from the elements of \tcode{r} in the following manner:
 \begin{itemize}
 \item
-If \tcode{\libconcept{convertible_to}<range_reference_t<R>, range_value_t<C>>}
+If \tcode{C} does not satisfy \libconcept{input_range} or
+\tcode{\libconcept{convertible_to}<range_reference_t<R>, range_value_t<C>>}
 is \tcode{true}:
 \begin{itemize}
 \item