pub fn push(&mut self, param_field: &str) -> &mut Self {
        self.params.insert(param_field.to_string(), None);

        self
    }
/// Push a new param field into `params`.
///
/// # Arguments
///
/// * `param_field`: The cmdline parameter field name.
Push a new param field into `params`.
Push a new param field into ` params ` .
pub fn push(&mut self, param_field: &str) -> &mut Self {
        self.params.insert(param_field.to_string(), None);
        self
    }
pub fn push ( & mut self , param_field : & str ) -> & mut Self { self . params . insert ( param_field . to_string ( ) , None ) ; self }
Push a new param field into `params`.
Push a new param field into ` params ` .
&mut self
param_field
&str
&mut self
param_field
&str