Constant for write-only file streams

If a stream is opened on a file with this method, it will wipe the previous file if any. Else, it will create the file.

Property definitions

core :: file $ Sys :: wipe_write
# Constant for write-only file streams
#
# If a stream is opened on a file with this method,
# it will wipe the previous file if any.
# Else, it will create the file.
private fun wipe_write: CString do return once "w".to_cstring
lib/core/file.nit:317,1--322,61