$NAME can be #Mnil. In this case, a coding system associated
with the current locale (LC_CTYPE) is used.
- @return If the operation was successful, mconv_stream_converter ()
+ @return
+ If the operation was successful, mconv_stream_converter ()
returns the created code converter. Otherwise it returns @c NULL
and assigns an error code to the external variable
#merror_code. */