Programing in Rust.

Your program will print a Rust Vector that you create by continually pushing tokens onto it. This assignment is intended to give you practice with the following concepts:

• enums
• Vectors
• pattern matching and match expressions

For this program, you will:

• Create an enum called Quantity with the following variants:
  • One (doesn't store any data)
  • ACouple (doesn't store any data)
  • AFew (doesn't store any data)
  • Several (doesn't store any data)
  • Other (stores a u32)
• Create an enum called Token with the following variants:
  • Amount (stores a Quantity, the previous enum that you create)
  • Character (stores a char)
  • Whitespace (doesn't store any data)
• Write a program function that does the following:
  • Accepts one program argument that is the name of a file
  • Reads the contents of the given file into a string
  • Creates a Vec called tokens
  • Loops through the string character by character
  • Creates a Token object each iterations based on the current character
  • Pushes the Token onto tokens
  • Prints tokens

Writing Your Program

You will want to put #[derive(Debug)] above your two enums (Quantity and Token).

If you want to use the ? operator in your main function, then you will need to:

• use the appropriate library (use std::error::Error;)
• write the appropriate function signature for main (fn main() -> Result<(), Box> {})
• return Ok(()) at the end of main

You will want to iterate through the contents of the file using a string iterator (call chars() on the String).

You will want to match on the current character. See the documentation for pattern syntax(https://doc.rust-lang.org/book/ch18-03-pattern-syntax.html).