render-value in drscheme:language:language<%>
This method is just like
render-value/format except that it is expected to put the entire value on a
single line with no newline after the value.
( -> void
send a-drscheme:language:language render-value value settings port port-write)
value : TST
settings : settings
port : port
port-write : (union #f ((instanceof snip%)-> void))