Issue with filling snippets with words starting with capital S.

[hanetzer]

I thought it was something I did (I tweaked it a bit) but same result with 2db902a unmodified.
if you start a snippet (c or cpp, maybe other files), and try to fill one of the placeholders with
a 'word' starting with an 'S' (capital s/shift-s), it will pop the following error at the bottom of the
window: E481: No range allowed

repro:
open test.c in nvim
start the for~ snippet
attempt to type S over size_t.

[hanetzer]

Investigation shows that doing the same with a small 's' also fails, in a new way:
it inserts the characters ':HopChar2' into the insert buffer. conflict with lua/user/hop.lua