pub fn expression(expr: &str) -> CallOpts {
        CallOpts {
            expression: expr.to_string(),
            ..Default::default()
        }
    }
/// Create a CallOpts with the Nix expression `expr`.
///
/// ```rust
/// extern crate lorri;
/// use lorri::nix;
/// let output: Result<u8, _> = nix::CallOpts::expression("let x = 5; in x")
///     .value();
/// assert_eq!(
///   output.unwrap(), 5
/// );
/// ```
Create a CallOpts with the Nix expression `expr`.
Create a CallOpts with the Nix expression ` expr ` .
pub fn expression(expr: &str) -> CallOpts {
        CallOpts {
            expression: expr.to_string(),
            ..Default::default()
        }
    }
pub fn expression ( expr : & str ) -> CallOpts { CallOpts { expression : expr . to_string ( ) , .. Default :: default ( ) } }
Create a CallOpts with the Nix expression `expr`.
Create a CallOpts with the Nix expression ` expr ` .
expr
&str
expr
&str