1) start nvim
2) go into insert mode
3) enter an expression via Ctrl-R =
4) enter "6e6/"
Upon getting the "/" nvim crashes with
vim: ../src/nvim/viml/parser/expressions.c:1241: viml_pexpr_handle_bop: Assertion »bop_node_lvl != new_top_node_lvl || bop_node_ass == new_top_node_ass«