Expand description

Assert a command (built with program and args) stderr string is less than an expression.

Pseudocode:
(program1 + args1 ⇒ command ⇒ stderr ⇒ string) < (expr into string)

§Example

let program = "bin/printf-stderr";
let args = ["%s", "hello"];
let s = String::from("hullo");
assert_program_args_stderr_lt_expr!(&program, &args, s);

§Module macros