pub fn to_writer_pretty<W, T>(writer: W, value: &T) -> Result<()>where W: Write, T: ?Sized + Serialize,
Serialize the given data structure as pretty-printed JSON into the I/O stream.
Serialization guarantees it only feeds valid UTF-8 sequences to the writer.
Serialization can fail if
T’s implementation of
Serialize decides to
fail, or if
T contains a map with non-string keys.