Function echo 

pub fn echo<HlGroup, Text, Chunks>(
    chunks: Chunks,
    history: bool,
    opts: &EchoOpts,
) -> Result<(), Error>
where
    Chunks: IntoIterator<Item = (Text, Option<HlGroup>)>,
    Text: Into<String>,
    HlGroup: Into<String>,

Binding to nvim_echo().

Echoes a message to the Neovim message area.